Documentation: clarify diff --cc
[git] / http-push.c
1 #include "cache.h"
2 #include "commit.h"
3 #include "pack.h"
4 #include "tag.h"
5 #include "blob.h"
6 #include "http.h"
7 #include "refs.h"
8 #include "diff.h"
9 #include "revision.h"
10 #include "exec_cmd.h"
11 #include "remote.h"
12 #include "list-objects.h"
13
14 #include <expat.h>
15
16 static const char http_push_usage[] =
17 "git http-push [--all] [--dry-run] [--force] [--verbose] <remote> [<head>...]\n";
18
19 #ifndef XML_STATUS_OK
20 enum XML_Status {
21   XML_STATUS_OK = 1,
22   XML_STATUS_ERROR = 0
23 };
24 #define XML_STATUS_OK    1
25 #define XML_STATUS_ERROR 0
26 #endif
27
28 #define PREV_BUF_SIZE 4096
29 #define RANGE_HEADER_SIZE 30
30
31 /* DAV methods */
32 #define DAV_LOCK "LOCK"
33 #define DAV_MKCOL "MKCOL"
34 #define DAV_MOVE "MOVE"
35 #define DAV_PROPFIND "PROPFIND"
36 #define DAV_PUT "PUT"
37 #define DAV_UNLOCK "UNLOCK"
38 #define DAV_DELETE "DELETE"
39
40 /* DAV lock flags */
41 #define DAV_PROP_LOCKWR (1u << 0)
42 #define DAV_PROP_LOCKEX (1u << 1)
43 #define DAV_LOCK_OK (1u << 2)
44
45 /* DAV XML properties */
46 #define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
47 #define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
48 #define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
49 #define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
50 #define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
51 #define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
52 #define DAV_PROPFIND_RESP ".multistatus.response"
53 #define DAV_PROPFIND_NAME ".multistatus.response.href"
54 #define DAV_PROPFIND_COLLECTION ".multistatus.response.propstat.prop.resourcetype.collection"
55
56 /* DAV request body templates */
57 #define PROPFIND_SUPPORTEDLOCK_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:prop xmlns:R=\"%s\">\n<D:supportedlock/>\n</D:prop>\n</D:propfind>"
58 #define PROPFIND_ALL_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/>\n</D:propfind>"
59 #define LOCK_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:lockinfo xmlns:D=\"DAV:\">\n<D:lockscope><D:exclusive/></D:lockscope>\n<D:locktype><D:write/></D:locktype>\n<D:owner>\n<D:href>mailto:%s</D:href>\n</D:owner>\n</D:lockinfo>"
60
61 #define LOCK_TIME 600
62 #define LOCK_REFRESH 30
63
64 /* bits #0-15 in revision.h */
65
66 #define LOCAL    (1u<<16)
67 #define REMOTE   (1u<<17)
68 #define FETCHING (1u<<18)
69 #define PUSHING  (1u<<19)
70
71 /* We allow "recursive" symbolic refs. Only within reason, though */
72 #define MAXDEPTH 5
73
74 static int pushing;
75 static int aborted;
76 static signed char remote_dir_exists[256];
77
78 static struct curl_slist *no_pragma_header;
79
80 static int push_verbosely;
81 static int push_all = MATCH_REFS_NONE;
82 static int force_all;
83 static int dry_run;
84
85 static struct object_list *objects;
86
87 struct repo
88 {
89         char *url;
90         int path_len;
91         int has_info_refs;
92         int can_update_info_refs;
93         int has_info_packs;
94         struct packed_git *packs;
95         struct remote_lock *locks;
96 };
97
98 static struct repo *remote;
99
100 enum transfer_state {
101         NEED_FETCH,
102         RUN_FETCH_LOOSE,
103         RUN_FETCH_PACKED,
104         NEED_PUSH,
105         RUN_MKCOL,
106         RUN_PUT,
107         RUN_MOVE,
108         ABORTED,
109         COMPLETE,
110 };
111
112 struct transfer_request
113 {
114         struct object *obj;
115         char *url;
116         char *dest;
117         struct remote_lock *lock;
118         struct curl_slist *headers;
119         struct buffer buffer;
120         char filename[PATH_MAX];
121         char tmpfile[PATH_MAX];
122         int local_fileno;
123         FILE *local_stream;
124         enum transfer_state state;
125         CURLcode curl_result;
126         char errorstr[CURL_ERROR_SIZE];
127         long http_code;
128         unsigned char real_sha1[20];
129         SHA_CTX c;
130         z_stream stream;
131         int zret;
132         int rename;
133         void *userData;
134         struct active_request_slot *slot;
135         struct transfer_request *next;
136 };
137
138 static struct transfer_request *request_queue_head;
139
140 struct xml_ctx
141 {
142         char *name;
143         int len;
144         char *cdata;
145         void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
146         void *userData;
147 };
148
149 struct remote_lock
150 {
151         char *url;
152         char *owner;
153         char *token;
154         time_t start_time;
155         long timeout;
156         int refreshing;
157         struct remote_lock *next;
158 };
159
160 /* Flags that control remote_ls processing */
161 #define PROCESS_FILES (1u << 0)
162 #define PROCESS_DIRS  (1u << 1)
163 #define RECURSIVE     (1u << 2)
164
165 /* Flags that remote_ls passes to callback functions */
166 #define IS_DIR (1u << 0)
167
168 struct remote_ls_ctx
169 {
170         char *path;
171         void (*userFunc)(struct remote_ls_ctx *ls);
172         void *userData;
173         int flags;
174         char *dentry_name;
175         int dentry_flags;
176         struct remote_ls_ctx *parent;
177 };
178
179 static void finish_request(struct transfer_request *request);
180 static void release_request(struct transfer_request *request);
181
182 static void process_response(void *callback_data)
183 {
184         struct transfer_request *request =
185                 (struct transfer_request *)callback_data;
186
187         finish_request(request);
188 }
189
190 #ifdef USE_CURL_MULTI
191 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
192                                void *data)
193 {
194         unsigned char expn[4096];
195         size_t size = eltsize * nmemb;
196         int posn = 0;
197         struct transfer_request *request = (struct transfer_request *)data;
198         do {
199                 ssize_t retval = xwrite(request->local_fileno,
200                                        (char *) ptr + posn, size - posn);
201                 if (retval < 0)
202                         return posn;
203                 posn += retval;
204         } while (posn < size);
205
206         request->stream.avail_in = size;
207         request->stream.next_in = ptr;
208         do {
209                 request->stream.next_out = expn;
210                 request->stream.avail_out = sizeof(expn);
211                 request->zret = inflate(&request->stream, Z_SYNC_FLUSH);
212                 SHA1_Update(&request->c, expn,
213                             sizeof(expn) - request->stream.avail_out);
214         } while (request->stream.avail_in && request->zret == Z_OK);
215         data_received++;
216         return size;
217 }
218
219 static void start_fetch_loose(struct transfer_request *request)
220 {
221         char *hex = sha1_to_hex(request->obj->sha1);
222         char *filename;
223         char prevfile[PATH_MAX];
224         char *url;
225         char *posn;
226         int prevlocal;
227         unsigned char prev_buf[PREV_BUF_SIZE];
228         ssize_t prev_read = 0;
229         long prev_posn = 0;
230         char range[RANGE_HEADER_SIZE];
231         struct curl_slist *range_header = NULL;
232         struct active_request_slot *slot;
233
234         filename = sha1_file_name(request->obj->sha1);
235         snprintf(request->filename, sizeof(request->filename), "%s", filename);
236         snprintf(request->tmpfile, sizeof(request->tmpfile),
237                  "%s.temp", filename);
238
239         snprintf(prevfile, sizeof(prevfile), "%s.prev", request->filename);
240         unlink(prevfile);
241         rename(request->tmpfile, prevfile);
242         unlink(request->tmpfile);
243
244         if (request->local_fileno != -1)
245                 error("fd leakage in start: %d", request->local_fileno);
246         request->local_fileno = open(request->tmpfile,
247                                      O_WRONLY | O_CREAT | O_EXCL, 0666);
248         /* This could have failed due to the "lazy directory creation";
249          * try to mkdir the last path component.
250          */
251         if (request->local_fileno < 0 && errno == ENOENT) {
252                 char *dir = strrchr(request->tmpfile, '/');
253                 if (dir) {
254                         *dir = 0;
255                         mkdir(request->tmpfile, 0777);
256                         *dir = '/';
257                 }
258                 request->local_fileno = open(request->tmpfile,
259                                              O_WRONLY | O_CREAT | O_EXCL, 0666);
260         }
261
262         if (request->local_fileno < 0) {
263                 request->state = ABORTED;
264                 error("Couldn't create temporary file %s for %s: %s",
265                       request->tmpfile, request->filename, strerror(errno));
266                 return;
267         }
268
269         memset(&request->stream, 0, sizeof(request->stream));
270
271         inflateInit(&request->stream);
272
273         SHA1_Init(&request->c);
274
275         url = xmalloc(strlen(remote->url) + 50);
276         request->url = xmalloc(strlen(remote->url) + 50);
277         strcpy(url, remote->url);
278         posn = url + strlen(remote->url);
279         strcpy(posn, "objects/");
280         posn += 8;
281         memcpy(posn, hex, 2);
282         posn += 2;
283         *(posn++) = '/';
284         strcpy(posn, hex + 2);
285         strcpy(request->url, url);
286
287         /* If a previous temp file is present, process what was already
288            fetched. */
289         prevlocal = open(prevfile, O_RDONLY);
290         if (prevlocal != -1) {
291                 do {
292                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
293                         if (prev_read>0) {
294                                 if (fwrite_sha1_file(prev_buf,
295                                                      1,
296                                                      prev_read,
297                                                      request) == prev_read) {
298                                         prev_posn += prev_read;
299                                 } else {
300                                         prev_read = -1;
301                                 }
302                         }
303                 } while (prev_read > 0);
304                 close(prevlocal);
305         }
306         unlink(prevfile);
307
308         /* Reset inflate/SHA1 if there was an error reading the previous temp
309            file; also rewind to the beginning of the local file. */
310         if (prev_read == -1) {
311                 memset(&request->stream, 0, sizeof(request->stream));
312                 inflateInit(&request->stream);
313                 SHA1_Init(&request->c);
314                 if (prev_posn>0) {
315                         prev_posn = 0;
316                         lseek(request->local_fileno, 0, SEEK_SET);
317                         ftruncate(request->local_fileno, 0);
318                 }
319         }
320
321         slot = get_active_slot();
322         slot->callback_func = process_response;
323         slot->callback_data = request;
324         request->slot = slot;
325
326         curl_easy_setopt(slot->curl, CURLOPT_FILE, request);
327         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
328         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
329         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
330         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
331
332         /* If we have successfully processed data from a previous fetch
333            attempt, only fetch the data we don't already have. */
334         if (prev_posn>0) {
335                 if (push_verbosely)
336                         fprintf(stderr,
337                                 "Resuming fetch of object %s at byte %ld\n",
338                                 hex, prev_posn);
339                 sprintf(range, "Range: bytes=%ld-", prev_posn);
340                 range_header = curl_slist_append(range_header, range);
341                 curl_easy_setopt(slot->curl,
342                                  CURLOPT_HTTPHEADER, range_header);
343         }
344
345         /* Try to get the request started, abort the request on error */
346         request->state = RUN_FETCH_LOOSE;
347         if (!start_active_slot(slot)) {
348                 fprintf(stderr, "Unable to start GET request\n");
349                 remote->can_update_info_refs = 0;
350                 release_request(request);
351         }
352 }
353
354 static void start_mkcol(struct transfer_request *request)
355 {
356         char *hex = sha1_to_hex(request->obj->sha1);
357         struct active_request_slot *slot;
358         char *posn;
359
360         request->url = xmalloc(strlen(remote->url) + 13);
361         strcpy(request->url, remote->url);
362         posn = request->url + strlen(remote->url);
363         strcpy(posn, "objects/");
364         posn += 8;
365         memcpy(posn, hex, 2);
366         posn += 2;
367         strcpy(posn, "/");
368
369         slot = get_active_slot();
370         slot->callback_func = process_response;
371         slot->callback_data = request;
372         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
373         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
374         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
375         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
376         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
377
378         if (start_active_slot(slot)) {
379                 request->slot = slot;
380                 request->state = RUN_MKCOL;
381         } else {
382                 request->state = ABORTED;
383                 free(request->url);
384                 request->url = NULL;
385         }
386 }
387 #endif
388
389 static void start_fetch_packed(struct transfer_request *request)
390 {
391         char *url;
392         struct packed_git *target;
393         FILE *packfile;
394         char *filename;
395         long prev_posn = 0;
396         char range[RANGE_HEADER_SIZE];
397         struct curl_slist *range_header = NULL;
398
399         struct transfer_request *check_request = request_queue_head;
400         struct active_request_slot *slot;
401
402         target = find_sha1_pack(request->obj->sha1, remote->packs);
403         if (!target) {
404                 fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", sha1_to_hex(request->obj->sha1));
405                 remote->can_update_info_refs = 0;
406                 release_request(request);
407                 return;
408         }
409
410         fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
411         fprintf(stderr, " which contains %s\n", sha1_to_hex(request->obj->sha1));
412
413         filename = sha1_pack_name(target->sha1);
414         snprintf(request->filename, sizeof(request->filename), "%s", filename);
415         snprintf(request->tmpfile, sizeof(request->tmpfile),
416                  "%s.temp", filename);
417
418         url = xmalloc(strlen(remote->url) + 64);
419         sprintf(url, "%sobjects/pack/pack-%s.pack",
420                 remote->url, sha1_to_hex(target->sha1));
421
422         /* Make sure there isn't another open request for this pack */
423         while (check_request) {
424                 if (check_request->state == RUN_FETCH_PACKED &&
425                     !strcmp(check_request->url, url)) {
426                         free(url);
427                         release_request(request);
428                         return;
429                 }
430                 check_request = check_request->next;
431         }
432
433         packfile = fopen(request->tmpfile, "a");
434         if (!packfile) {
435                 fprintf(stderr, "Unable to open local file %s for pack",
436                         request->tmpfile);
437                 remote->can_update_info_refs = 0;
438                 free(url);
439                 return;
440         }
441
442         slot = get_active_slot();
443         slot->callback_func = process_response;
444         slot->callback_data = request;
445         request->slot = slot;
446         request->local_stream = packfile;
447         request->userData = target;
448
449         request->url = url;
450         curl_easy_setopt(slot->curl, CURLOPT_FILE, packfile);
451         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
452         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
453         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
454         slot->local = packfile;
455
456         /* If there is data present from a previous transfer attempt,
457            resume where it left off */
458         prev_posn = ftell(packfile);
459         if (prev_posn>0) {
460                 if (push_verbosely)
461                         fprintf(stderr,
462                                 "Resuming fetch of pack %s at byte %ld\n",
463                                 sha1_to_hex(target->sha1), prev_posn);
464                 sprintf(range, "Range: bytes=%ld-", prev_posn);
465                 range_header = curl_slist_append(range_header, range);
466                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
467         }
468
469         /* Try to get the request started, abort the request on error */
470         request->state = RUN_FETCH_PACKED;
471         if (!start_active_slot(slot)) {
472                 fprintf(stderr, "Unable to start GET request\n");
473                 remote->can_update_info_refs = 0;
474                 release_request(request);
475         }
476 }
477
478 static void start_put(struct transfer_request *request)
479 {
480         char *hex = sha1_to_hex(request->obj->sha1);
481         struct active_request_slot *slot;
482         char *posn;
483         enum object_type type;
484         char hdr[50];
485         void *unpacked;
486         unsigned long len;
487         int hdrlen;
488         ssize_t size;
489         z_stream stream;
490
491         unpacked = read_sha1_file(request->obj->sha1, &type, &len);
492         hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1;
493
494         /* Set it up */
495         memset(&stream, 0, sizeof(stream));
496         deflateInit(&stream, zlib_compression_level);
497         size = deflateBound(&stream, len + hdrlen);
498         strbuf_init(&request->buffer.buf, size);
499         request->buffer.posn = 0;
500
501         /* Compress it */
502         stream.next_out = (unsigned char *)request->buffer.buf.buf;
503         stream.avail_out = size;
504
505         /* First header.. */
506         stream.next_in = (void *)hdr;
507         stream.avail_in = hdrlen;
508         while (deflate(&stream, 0) == Z_OK)
509                 /* nothing */;
510
511         /* Then the data itself.. */
512         stream.next_in = unpacked;
513         stream.avail_in = len;
514         while (deflate(&stream, Z_FINISH) == Z_OK)
515                 /* nothing */;
516         deflateEnd(&stream);
517         free(unpacked);
518
519         request->buffer.buf.len = stream.total_out;
520
521         request->url = xmalloc(strlen(remote->url) +
522                                strlen(request->lock->token) + 51);
523         strcpy(request->url, remote->url);
524         posn = request->url + strlen(remote->url);
525         strcpy(posn, "objects/");
526         posn += 8;
527         memcpy(posn, hex, 2);
528         posn += 2;
529         *(posn++) = '/';
530         strcpy(posn, hex + 2);
531         request->dest = xmalloc(strlen(request->url) + 14);
532         sprintf(request->dest, "Destination: %s", request->url);
533         posn += 38;
534         *(posn++) = '_';
535         strcpy(posn, request->lock->token);
536
537         slot = get_active_slot();
538         slot->callback_func = process_response;
539         slot->callback_data = request;
540         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &request->buffer);
541         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, request->buffer.buf.len);
542         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
543         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
544         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
545         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
546         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
547         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
548         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
549
550         if (start_active_slot(slot)) {
551                 request->slot = slot;
552                 request->state = RUN_PUT;
553         } else {
554                 request->state = ABORTED;
555                 free(request->url);
556                 request->url = NULL;
557         }
558 }
559
560 static void start_move(struct transfer_request *request)
561 {
562         struct active_request_slot *slot;
563         struct curl_slist *dav_headers = NULL;
564
565         slot = get_active_slot();
566         slot->callback_func = process_response;
567         slot->callback_data = request;
568         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
569         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MOVE);
570         dav_headers = curl_slist_append(dav_headers, request->dest);
571         dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
572         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
573         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
574         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
575
576         if (start_active_slot(slot)) {
577                 request->slot = slot;
578                 request->state = RUN_MOVE;
579         } else {
580                 request->state = ABORTED;
581                 free(request->url);
582                 request->url = NULL;
583         }
584 }
585
586 static int refresh_lock(struct remote_lock *lock)
587 {
588         struct active_request_slot *slot;
589         struct slot_results results;
590         char *if_header;
591         char timeout_header[25];
592         struct curl_slist *dav_headers = NULL;
593         int rc = 0;
594
595         lock->refreshing = 1;
596
597         if_header = xmalloc(strlen(lock->token) + 25);
598         sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
599         sprintf(timeout_header, "Timeout: Second-%ld", lock->timeout);
600         dav_headers = curl_slist_append(dav_headers, if_header);
601         dav_headers = curl_slist_append(dav_headers, timeout_header);
602
603         slot = get_active_slot();
604         slot->results = &results;
605         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
606         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
607         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
608         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
609         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
610
611         if (start_active_slot(slot)) {
612                 run_active_slot(slot);
613                 if (results.curl_result != CURLE_OK) {
614                         fprintf(stderr, "LOCK HTTP error %ld\n",
615                                 results.http_code);
616                 } else {
617                         lock->start_time = time(NULL);
618                         rc = 1;
619                 }
620         }
621
622         lock->refreshing = 0;
623         curl_slist_free_all(dav_headers);
624         free(if_header);
625
626         return rc;
627 }
628
629 static void check_locks(void)
630 {
631         struct remote_lock *lock = remote->locks;
632         time_t current_time = time(NULL);
633         int time_remaining;
634
635         while (lock) {
636                 time_remaining = lock->start_time + lock->timeout -
637                         current_time;
638                 if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
639                         if (!refresh_lock(lock)) {
640                                 fprintf(stderr,
641                                         "Unable to refresh lock for %s\n",
642                                         lock->url);
643                                 aborted = 1;
644                                 return;
645                         }
646                 }
647                 lock = lock->next;
648         }
649 }
650
651 static void release_request(struct transfer_request *request)
652 {
653         struct transfer_request *entry = request_queue_head;
654
655         if (request == request_queue_head) {
656                 request_queue_head = request->next;
657         } else {
658                 while (entry->next != NULL && entry->next != request)
659                         entry = entry->next;
660                 if (entry->next == request)
661                         entry->next = entry->next->next;
662         }
663
664         if (request->local_fileno != -1)
665                 close(request->local_fileno);
666         if (request->local_stream)
667                 fclose(request->local_stream);
668         free(request->url);
669         free(request);
670 }
671
672 static void finish_request(struct transfer_request *request)
673 {
674         struct stat st;
675         struct packed_git *target;
676         struct packed_git **lst;
677
678         request->curl_result = request->slot->curl_result;
679         request->http_code = request->slot->http_code;
680         request->slot = NULL;
681
682         /* Keep locks active */
683         check_locks();
684
685         if (request->headers != NULL)
686                 curl_slist_free_all(request->headers);
687
688         /* URL is reused for MOVE after PUT */
689         if (request->state != RUN_PUT) {
690                 free(request->url);
691                 request->url = NULL;
692         }
693
694         if (request->state == RUN_MKCOL) {
695                 if (request->curl_result == CURLE_OK ||
696                     request->http_code == 405) {
697                         remote_dir_exists[request->obj->sha1[0]] = 1;
698                         start_put(request);
699                 } else {
700                         fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
701                                 sha1_to_hex(request->obj->sha1),
702                                 request->curl_result, request->http_code);
703                         request->state = ABORTED;
704                         aborted = 1;
705                 }
706         } else if (request->state == RUN_PUT) {
707                 if (request->curl_result == CURLE_OK) {
708                         start_move(request);
709                 } else {
710                         fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
711                                 sha1_to_hex(request->obj->sha1),
712                                 request->curl_result, request->http_code);
713                         request->state = ABORTED;
714                         aborted = 1;
715                 }
716         } else if (request->state == RUN_MOVE) {
717                 if (request->curl_result == CURLE_OK) {
718                         if (push_verbosely)
719                                 fprintf(stderr, "    sent %s\n",
720                                         sha1_to_hex(request->obj->sha1));
721                         request->obj->flags |= REMOTE;
722                         release_request(request);
723                 } else {
724                         fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
725                                 sha1_to_hex(request->obj->sha1),
726                                 request->curl_result, request->http_code);
727                         request->state = ABORTED;
728                         aborted = 1;
729                 }
730         } else if (request->state == RUN_FETCH_LOOSE) {
731                 fchmod(request->local_fileno, 0444);
732                 close(request->local_fileno); request->local_fileno = -1;
733
734                 if (request->curl_result != CURLE_OK &&
735                     request->http_code != 416) {
736                         if (stat(request->tmpfile, &st) == 0) {
737                                 if (st.st_size == 0)
738                                         unlink(request->tmpfile);
739                         }
740                 } else {
741                         if (request->http_code == 416)
742                                 fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
743
744                         inflateEnd(&request->stream);
745                         SHA1_Final(request->real_sha1, &request->c);
746                         if (request->zret != Z_STREAM_END) {
747                                 unlink(request->tmpfile);
748                         } else if (hashcmp(request->obj->sha1, request->real_sha1)) {
749                                 unlink(request->tmpfile);
750                         } else {
751                                 request->rename =
752                                         move_temp_to_file(
753                                                 request->tmpfile,
754                                                 request->filename);
755                                 if (request->rename == 0) {
756                                         request->obj->flags |= (LOCAL | REMOTE);
757                                 }
758                         }
759                 }
760
761                 /* Try fetching packed if necessary */
762                 if (request->obj->flags & LOCAL)
763                         release_request(request);
764                 else
765                         start_fetch_packed(request);
766
767         } else if (request->state == RUN_FETCH_PACKED) {
768                 if (request->curl_result != CURLE_OK) {
769                         fprintf(stderr, "Unable to get pack file %s\n%s",
770                                 request->url, curl_errorstr);
771                         remote->can_update_info_refs = 0;
772                 } else {
773                         off_t pack_size = ftell(request->local_stream);
774
775                         fclose(request->local_stream);
776                         request->local_stream = NULL;
777                         if (!move_temp_to_file(request->tmpfile,
778                                                request->filename)) {
779                                 target = (struct packed_git *)request->userData;
780                                 target->pack_size = pack_size;
781                                 lst = &remote->packs;
782                                 while (*lst != target)
783                                         lst = &((*lst)->next);
784                                 *lst = (*lst)->next;
785
786                                 if (!verify_pack(target))
787                                         install_packed_git(target);
788                                 else
789                                         remote->can_update_info_refs = 0;
790                         }
791                 }
792                 release_request(request);
793         }
794 }
795
796 #ifdef USE_CURL_MULTI
797 static int fill_active_slot(void *unused)
798 {
799         struct transfer_request *request = request_queue_head;
800
801         if (aborted)
802                 return 0;
803
804         for (request = request_queue_head; request; request = request->next) {
805                 if (request->state == NEED_FETCH) {
806                         start_fetch_loose(request);
807                         return 1;
808                 } else if (pushing && request->state == NEED_PUSH) {
809                         if (remote_dir_exists[request->obj->sha1[0]] == 1) {
810                                 start_put(request);
811                         } else {
812                                 start_mkcol(request);
813                         }
814                         return 1;
815                 }
816         }
817         return 0;
818 }
819 #endif
820
821 static void get_remote_object_list(unsigned char parent);
822
823 static void add_fetch_request(struct object *obj)
824 {
825         struct transfer_request *request;
826
827         check_locks();
828
829         /*
830          * Don't fetch the object if it's known to exist locally
831          * or is already in the request queue
832          */
833         if (remote_dir_exists[obj->sha1[0]] == -1)
834                 get_remote_object_list(obj->sha1[0]);
835         if (obj->flags & (LOCAL | FETCHING))
836                 return;
837
838         obj->flags |= FETCHING;
839         request = xmalloc(sizeof(*request));
840         request->obj = obj;
841         request->url = NULL;
842         request->lock = NULL;
843         request->headers = NULL;
844         request->local_fileno = -1;
845         request->local_stream = NULL;
846         request->state = NEED_FETCH;
847         request->next = request_queue_head;
848         request_queue_head = request;
849
850 #ifdef USE_CURL_MULTI
851         fill_active_slots();
852         step_active_slots();
853 #endif
854 }
855
856 static int add_send_request(struct object *obj, struct remote_lock *lock)
857 {
858         struct transfer_request *request = request_queue_head;
859         struct packed_git *target;
860
861         /* Keep locks active */
862         check_locks();
863
864         /*
865          * Don't push the object if it's known to exist on the remote
866          * or is already in the request queue
867          */
868         if (remote_dir_exists[obj->sha1[0]] == -1)
869                 get_remote_object_list(obj->sha1[0]);
870         if (obj->flags & (REMOTE | PUSHING))
871                 return 0;
872         target = find_sha1_pack(obj->sha1, remote->packs);
873         if (target) {
874                 obj->flags |= REMOTE;
875                 return 0;
876         }
877
878         obj->flags |= PUSHING;
879         request = xmalloc(sizeof(*request));
880         request->obj = obj;
881         request->url = NULL;
882         request->lock = lock;
883         request->headers = NULL;
884         request->local_fileno = -1;
885         request->local_stream = NULL;
886         request->state = NEED_PUSH;
887         request->next = request_queue_head;
888         request_queue_head = request;
889
890 #ifdef USE_CURL_MULTI
891         fill_active_slots();
892         step_active_slots();
893 #endif
894
895         return 1;
896 }
897
898 static int fetch_index(unsigned char *sha1)
899 {
900         char *hex = sha1_to_hex(sha1);
901         char *filename;
902         char *url;
903         char tmpfile[PATH_MAX];
904         long prev_posn = 0;
905         char range[RANGE_HEADER_SIZE];
906         struct curl_slist *range_header = NULL;
907
908         FILE *indexfile;
909         struct active_request_slot *slot;
910         struct slot_results results;
911
912         /* Don't use the index if the pack isn't there */
913         url = xmalloc(strlen(remote->url) + 64);
914         sprintf(url, "%sobjects/pack/pack-%s.pack", remote->url, hex);
915         slot = get_active_slot();
916         slot->results = &results;
917         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
918         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
919         if (start_active_slot(slot)) {
920                 run_active_slot(slot);
921                 if (results.curl_result != CURLE_OK) {
922                         free(url);
923                         return error("Unable to verify pack %s is available",
924                                      hex);
925                 }
926         } else {
927                 free(url);
928                 return error("Unable to start request");
929         }
930
931         if (has_pack_index(sha1)) {
932                 free(url);
933                 return 0;
934         }
935
936         if (push_verbosely)
937                 fprintf(stderr, "Getting index for pack %s\n", hex);
938
939         sprintf(url, "%sobjects/pack/pack-%s.idx", remote->url, hex);
940
941         filename = sha1_pack_index_name(sha1);
942         snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
943         indexfile = fopen(tmpfile, "a");
944         if (!indexfile) {
945                 free(url);
946                 return error("Unable to open local file %s for pack index",
947                              tmpfile);
948         }
949
950         slot = get_active_slot();
951         slot->results = &results;
952         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
953         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
954         curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
955         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
956         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
957         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
958         slot->local = indexfile;
959
960         /* If there is data present from a previous transfer attempt,
961            resume where it left off */
962         prev_posn = ftell(indexfile);
963         if (prev_posn>0) {
964                 if (push_verbosely)
965                         fprintf(stderr,
966                                 "Resuming fetch of index for pack %s at byte %ld\n",
967                                 hex, prev_posn);
968                 sprintf(range, "Range: bytes=%ld-", prev_posn);
969                 range_header = curl_slist_append(range_header, range);
970                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
971         }
972
973         if (start_active_slot(slot)) {
974                 run_active_slot(slot);
975                 if (results.curl_result != CURLE_OK) {
976                         free(url);
977                         fclose(indexfile);
978                         return error("Unable to get pack index %s\n%s", url,
979                                      curl_errorstr);
980                 }
981         } else {
982                 free(url);
983                 fclose(indexfile);
984                 return error("Unable to start request");
985         }
986
987         free(url);
988         fclose(indexfile);
989
990         return move_temp_to_file(tmpfile, filename);
991 }
992
993 static int setup_index(unsigned char *sha1)
994 {
995         struct packed_git *new_pack;
996
997         if (fetch_index(sha1))
998                 return -1;
999
1000         new_pack = parse_pack_index(sha1);
1001         new_pack->next = remote->packs;
1002         remote->packs = new_pack;
1003         return 0;
1004 }
1005
1006 static int fetch_indices(void)
1007 {
1008         unsigned char sha1[20];
1009         char *url;
1010         struct strbuf buffer = STRBUF_INIT;
1011         char *data;
1012         int i = 0;
1013
1014         struct active_request_slot *slot;
1015         struct slot_results results;
1016
1017         if (push_verbosely)
1018                 fprintf(stderr, "Getting pack list\n");
1019
1020         url = xmalloc(strlen(remote->url) + 20);
1021         sprintf(url, "%sobjects/info/packs", remote->url);
1022
1023         slot = get_active_slot();
1024         slot->results = &results;
1025         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1026         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1027         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1028         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1029         if (start_active_slot(slot)) {
1030                 run_active_slot(slot);
1031                 if (results.curl_result != CURLE_OK) {
1032                         strbuf_release(&buffer);
1033                         free(url);
1034                         if (results.http_code == 404)
1035                                 return 0;
1036                         else
1037                                 return error("%s", curl_errorstr);
1038                 }
1039         } else {
1040                 strbuf_release(&buffer);
1041                 free(url);
1042                 return error("Unable to start request");
1043         }
1044         free(url);
1045
1046         data = buffer.buf;
1047         while (i < buffer.len) {
1048                 switch (data[i]) {
1049                 case 'P':
1050                         i++;
1051                         if (i + 52 < buffer.len &&
1052                             !prefixcmp(data + i, " pack-") &&
1053                             !prefixcmp(data + i + 46, ".pack\n")) {
1054                                 get_sha1_hex(data + i + 6, sha1);
1055                                 setup_index(sha1);
1056                                 i += 51;
1057                                 break;
1058                         }
1059                 default:
1060                         while (data[i] != '\n')
1061                                 i++;
1062                 }
1063                 i++;
1064         }
1065
1066         strbuf_release(&buffer);
1067         return 0;
1068 }
1069
1070 static void one_remote_object(const char *hex)
1071 {
1072         unsigned char sha1[20];
1073         struct object *obj;
1074
1075         if (get_sha1_hex(hex, sha1) != 0)
1076                 return;
1077
1078         obj = lookup_object(sha1);
1079         if (!obj)
1080                 obj = parse_object(sha1);
1081
1082         /* Ignore remote objects that don't exist locally */
1083         if (!obj)
1084                 return;
1085
1086         obj->flags |= REMOTE;
1087         if (!object_list_contains(objects, obj))
1088                 object_list_insert(obj, &objects);
1089 }
1090
1091 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
1092 {
1093         int *lock_flags = (int *)ctx->userData;
1094
1095         if (tag_closed) {
1096                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
1097                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
1098                             (*lock_flags & DAV_PROP_LOCKWR)) {
1099                                 *lock_flags |= DAV_LOCK_OK;
1100                         }
1101                         *lock_flags &= DAV_LOCK_OK;
1102                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
1103                         *lock_flags |= DAV_PROP_LOCKWR;
1104                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
1105                         *lock_flags |= DAV_PROP_LOCKEX;
1106                 }
1107         }
1108 }
1109
1110 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
1111 {
1112         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
1113
1114         if (tag_closed && ctx->cdata) {
1115                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
1116                         lock->owner = xmalloc(strlen(ctx->cdata) + 1);
1117                         strcpy(lock->owner, ctx->cdata);
1118                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
1119                         if (!prefixcmp(ctx->cdata, "Second-"))
1120                                 lock->timeout =
1121                                         strtol(ctx->cdata + 7, NULL, 10);
1122                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
1123                         if (!prefixcmp(ctx->cdata, "opaquelocktoken:")) {
1124                                 lock->token = xmalloc(strlen(ctx->cdata) - 15);
1125                                 strcpy(lock->token, ctx->cdata + 16);
1126                         }
1127                 }
1128         }
1129 }
1130
1131 static void one_remote_ref(char *refname);
1132
1133 static void
1134 xml_start_tag(void *userData, const char *name, const char **atts)
1135 {
1136         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1137         const char *c = strchr(name, ':');
1138         int new_len;
1139
1140         if (c == NULL)
1141                 c = name;
1142         else
1143                 c++;
1144
1145         new_len = strlen(ctx->name) + strlen(c) + 2;
1146
1147         if (new_len > ctx->len) {
1148                 ctx->name = xrealloc(ctx->name, new_len);
1149                 ctx->len = new_len;
1150         }
1151         strcat(ctx->name, ".");
1152         strcat(ctx->name, c);
1153
1154         free(ctx->cdata);
1155         ctx->cdata = NULL;
1156
1157         ctx->userFunc(ctx, 0);
1158 }
1159
1160 static void
1161 xml_end_tag(void *userData, const char *name)
1162 {
1163         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1164         const char *c = strchr(name, ':');
1165         char *ep;
1166
1167         ctx->userFunc(ctx, 1);
1168
1169         if (c == NULL)
1170                 c = name;
1171         else
1172                 c++;
1173
1174         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
1175         *ep = 0;
1176 }
1177
1178 static void
1179 xml_cdata(void *userData, const XML_Char *s, int len)
1180 {
1181         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1182         free(ctx->cdata);
1183         ctx->cdata = xmemdupz(s, len);
1184 }
1185
1186 static struct remote_lock *lock_remote(const char *path, long timeout)
1187 {
1188         struct active_request_slot *slot;
1189         struct slot_results results;
1190         struct buffer out_buffer = { STRBUF_INIT, 0 };
1191         struct strbuf in_buffer = STRBUF_INIT;
1192         char *url;
1193         char *ep;
1194         char timeout_header[25];
1195         struct remote_lock *lock = NULL;
1196         struct curl_slist *dav_headers = NULL;
1197         struct xml_ctx ctx;
1198
1199         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1200         sprintf(url, "%s%s", remote->url, path);
1201
1202         /* Make sure leading directories exist for the remote ref */
1203         ep = strchr(url + strlen(remote->url) + 1, '/');
1204         while (ep) {
1205                 *ep = 0;
1206                 slot = get_active_slot();
1207                 slot->results = &results;
1208                 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1209                 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1210                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
1211                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1212                 if (start_active_slot(slot)) {
1213                         run_active_slot(slot);
1214                         if (results.curl_result != CURLE_OK &&
1215                             results.http_code != 405) {
1216                                 fprintf(stderr,
1217                                         "Unable to create branch path %s\n",
1218                                         url);
1219                                 free(url);
1220                                 return NULL;
1221                         }
1222                 } else {
1223                         fprintf(stderr, "Unable to start MKCOL request\n");
1224                         free(url);
1225                         return NULL;
1226                 }
1227                 *ep = '/';
1228                 ep = strchr(ep + 1, '/');
1229         }
1230
1231         strbuf_addf(&out_buffer.buf, LOCK_REQUEST, git_default_email);
1232
1233         sprintf(timeout_header, "Timeout: Second-%ld", timeout);
1234         dav_headers = curl_slist_append(dav_headers, timeout_header);
1235         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1236
1237         slot = get_active_slot();
1238         slot->results = &results;
1239         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1240         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1241         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1242         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1243         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1244         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1245         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1246         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
1247         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1248
1249         lock = xcalloc(1, sizeof(*lock));
1250         lock->timeout = -1;
1251
1252         if (start_active_slot(slot)) {
1253                 run_active_slot(slot);
1254                 if (results.curl_result == CURLE_OK) {
1255                         XML_Parser parser = XML_ParserCreate(NULL);
1256                         enum XML_Status result;
1257                         ctx.name = xcalloc(10, 1);
1258                         ctx.len = 0;
1259                         ctx.cdata = NULL;
1260                         ctx.userFunc = handle_new_lock_ctx;
1261                         ctx.userData = lock;
1262                         XML_SetUserData(parser, &ctx);
1263                         XML_SetElementHandler(parser, xml_start_tag,
1264                                               xml_end_tag);
1265                         XML_SetCharacterDataHandler(parser, xml_cdata);
1266                         result = XML_Parse(parser, in_buffer.buf,
1267                                            in_buffer.len, 1);
1268                         free(ctx.name);
1269                         if (result != XML_STATUS_OK) {
1270                                 fprintf(stderr, "XML error: %s\n",
1271                                         XML_ErrorString(
1272                                                 XML_GetErrorCode(parser)));
1273                                 lock->timeout = -1;
1274                         }
1275                         XML_ParserFree(parser);
1276                 }
1277         } else {
1278                 fprintf(stderr, "Unable to start LOCK request\n");
1279         }
1280
1281         curl_slist_free_all(dav_headers);
1282         strbuf_release(&out_buffer.buf);
1283         strbuf_release(&in_buffer);
1284
1285         if (lock->token == NULL || lock->timeout <= 0) {
1286                 free(lock->token);
1287                 free(lock->owner);
1288                 free(url);
1289                 free(lock);
1290                 lock = NULL;
1291         } else {
1292                 lock->url = url;
1293                 lock->start_time = time(NULL);
1294                 lock->next = remote->locks;
1295                 remote->locks = lock;
1296         }
1297
1298         return lock;
1299 }
1300
1301 static int unlock_remote(struct remote_lock *lock)
1302 {
1303         struct active_request_slot *slot;
1304         struct slot_results results;
1305         struct remote_lock *prev = remote->locks;
1306         char *lock_token_header;
1307         struct curl_slist *dav_headers = NULL;
1308         int rc = 0;
1309
1310         lock_token_header = xmalloc(strlen(lock->token) + 31);
1311         sprintf(lock_token_header, "Lock-Token: <opaquelocktoken:%s>",
1312                 lock->token);
1313         dav_headers = curl_slist_append(dav_headers, lock_token_header);
1314
1315         slot = get_active_slot();
1316         slot->results = &results;
1317         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1318         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1319         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
1320         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1321
1322         if (start_active_slot(slot)) {
1323                 run_active_slot(slot);
1324                 if (results.curl_result == CURLE_OK)
1325                         rc = 1;
1326                 else
1327                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
1328                                 results.http_code);
1329         } else {
1330                 fprintf(stderr, "Unable to start UNLOCK request\n");
1331         }
1332
1333         curl_slist_free_all(dav_headers);
1334         free(lock_token_header);
1335
1336         if (remote->locks == lock) {
1337                 remote->locks = lock->next;
1338         } else {
1339                 while (prev && prev->next != lock)
1340                         prev = prev->next;
1341                 if (prev)
1342                         prev->next = prev->next->next;
1343         }
1344
1345         free(lock->owner);
1346         free(lock->url);
1347         free(lock->token);
1348         free(lock);
1349
1350         return rc;
1351 }
1352
1353 static void remove_locks(void)
1354 {
1355         struct remote_lock *lock = remote->locks;
1356
1357         fprintf(stderr, "Removing remote locks...\n");
1358         while (lock) {
1359                 unlock_remote(lock);
1360                 lock = lock->next;
1361         }
1362 }
1363
1364 static void remove_locks_on_signal(int signo)
1365 {
1366         remove_locks();
1367         signal(signo, SIG_DFL);
1368         raise(signo);
1369 }
1370
1371 static void remote_ls(const char *path, int flags,
1372                       void (*userFunc)(struct remote_ls_ctx *ls),
1373                       void *userData);
1374
1375 static void process_ls_object(struct remote_ls_ctx *ls)
1376 {
1377         unsigned int *parent = (unsigned int *)ls->userData;
1378         char *path = ls->dentry_name;
1379         char *obj_hex;
1380
1381         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1382                 remote_dir_exists[*parent] = 1;
1383                 return;
1384         }
1385
1386         if (strlen(path) != 49)
1387                 return;
1388         path += 8;
1389         obj_hex = xmalloc(strlen(path));
1390         /* NB: path is not null-terminated, can not use strlcpy here */
1391         memcpy(obj_hex, path, 2);
1392         strcpy(obj_hex + 2, path + 3);
1393         one_remote_object(obj_hex);
1394         free(obj_hex);
1395 }
1396
1397 static void process_ls_ref(struct remote_ls_ctx *ls)
1398 {
1399         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1400                 fprintf(stderr, "  %s\n", ls->dentry_name);
1401                 return;
1402         }
1403
1404         if (!(ls->dentry_flags & IS_DIR))
1405                 one_remote_ref(ls->dentry_name);
1406 }
1407
1408 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1409 {
1410         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1411
1412         if (tag_closed) {
1413                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1414                         if (ls->dentry_flags & IS_DIR) {
1415                                 if (ls->flags & PROCESS_DIRS) {
1416                                         ls->userFunc(ls);
1417                                 }
1418                                 if (strcmp(ls->dentry_name, ls->path) &&
1419                                     ls->flags & RECURSIVE) {
1420                                         remote_ls(ls->dentry_name,
1421                                                   ls->flags,
1422                                                   ls->userFunc,
1423                                                   ls->userData);
1424                                 }
1425                         } else if (ls->flags & PROCESS_FILES) {
1426                                 ls->userFunc(ls);
1427                         }
1428                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1429                         ls->dentry_name = xmalloc(strlen(ctx->cdata) -
1430                                                   remote->path_len + 1);
1431                         strcpy(ls->dentry_name, ctx->cdata + remote->path_len);
1432                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1433                         ls->dentry_flags |= IS_DIR;
1434                 }
1435         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1436                 free(ls->dentry_name);
1437                 ls->dentry_name = NULL;
1438                 ls->dentry_flags = 0;
1439         }
1440 }
1441
1442 static void remote_ls(const char *path, int flags,
1443                       void (*userFunc)(struct remote_ls_ctx *ls),
1444                       void *userData)
1445 {
1446         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1447         struct active_request_slot *slot;
1448         struct slot_results results;
1449         struct strbuf in_buffer = STRBUF_INIT;
1450         struct buffer out_buffer = { STRBUF_INIT, 0 };
1451         struct curl_slist *dav_headers = NULL;
1452         struct xml_ctx ctx;
1453         struct remote_ls_ctx ls;
1454
1455         ls.flags = flags;
1456         ls.path = xstrdup(path);
1457         ls.dentry_name = NULL;
1458         ls.dentry_flags = 0;
1459         ls.userData = userData;
1460         ls.userFunc = userFunc;
1461
1462         sprintf(url, "%s%s", remote->url, path);
1463
1464         strbuf_addf(&out_buffer.buf, PROPFIND_ALL_REQUEST);
1465
1466         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1467         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1468
1469         slot = get_active_slot();
1470         slot->results = &results;
1471         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1472         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1473         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1474         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1475         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1476         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1477         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1478         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1479         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1480
1481         if (start_active_slot(slot)) {
1482                 run_active_slot(slot);
1483                 if (results.curl_result == CURLE_OK) {
1484                         XML_Parser parser = XML_ParserCreate(NULL);
1485                         enum XML_Status result;
1486                         ctx.name = xcalloc(10, 1);
1487                         ctx.len = 0;
1488                         ctx.cdata = NULL;
1489                         ctx.userFunc = handle_remote_ls_ctx;
1490                         ctx.userData = &ls;
1491                         XML_SetUserData(parser, &ctx);
1492                         XML_SetElementHandler(parser, xml_start_tag,
1493                                               xml_end_tag);
1494                         XML_SetCharacterDataHandler(parser, xml_cdata);
1495                         result = XML_Parse(parser, in_buffer.buf,
1496                                            in_buffer.len, 1);
1497                         free(ctx.name);
1498
1499                         if (result != XML_STATUS_OK) {
1500                                 fprintf(stderr, "XML error: %s\n",
1501                                         XML_ErrorString(
1502                                                 XML_GetErrorCode(parser)));
1503                         }
1504                         XML_ParserFree(parser);
1505                 }
1506         } else {
1507                 fprintf(stderr, "Unable to start PROPFIND request\n");
1508         }
1509
1510         free(ls.path);
1511         free(url);
1512         strbuf_release(&out_buffer.buf);
1513         strbuf_release(&in_buffer);
1514         curl_slist_free_all(dav_headers);
1515 }
1516
1517 static void get_remote_object_list(unsigned char parent)
1518 {
1519         char path[] = "objects/XX/";
1520         static const char hex[] = "0123456789abcdef";
1521         unsigned int val = parent;
1522
1523         path[8] = hex[val >> 4];
1524         path[9] = hex[val & 0xf];
1525         remote_dir_exists[val] = 0;
1526         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1527                   process_ls_object, &val);
1528 }
1529
1530 static int locking_available(void)
1531 {
1532         struct active_request_slot *slot;
1533         struct slot_results results;
1534         struct strbuf in_buffer = STRBUF_INIT;
1535         struct buffer out_buffer = { STRBUF_INIT, 0 };
1536         struct curl_slist *dav_headers = NULL;
1537         struct xml_ctx ctx;
1538         int lock_flags = 0;
1539
1540         strbuf_addf(&out_buffer.buf, PROPFIND_SUPPORTEDLOCK_REQUEST, remote->url);
1541
1542         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1543         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1544
1545         slot = get_active_slot();
1546         slot->results = &results;
1547         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1548         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1549         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1550         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1551         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1552         curl_easy_setopt(slot->curl, CURLOPT_URL, remote->url);
1553         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1554         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1555         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1556
1557         if (start_active_slot(slot)) {
1558                 run_active_slot(slot);
1559                 if (results.curl_result == CURLE_OK) {
1560                         XML_Parser parser = XML_ParserCreate(NULL);
1561                         enum XML_Status result;
1562                         ctx.name = xcalloc(10, 1);
1563                         ctx.len = 0;
1564                         ctx.cdata = NULL;
1565                         ctx.userFunc = handle_lockprop_ctx;
1566                         ctx.userData = &lock_flags;
1567                         XML_SetUserData(parser, &ctx);
1568                         XML_SetElementHandler(parser, xml_start_tag,
1569                                               xml_end_tag);
1570                         result = XML_Parse(parser, in_buffer.buf,
1571                                            in_buffer.len, 1);
1572                         free(ctx.name);
1573
1574                         if (result != XML_STATUS_OK) {
1575                                 fprintf(stderr, "XML error: %s\n",
1576                                         XML_ErrorString(
1577                                                 XML_GetErrorCode(parser)));
1578                                 lock_flags = 0;
1579                         }
1580                         XML_ParserFree(parser);
1581                         if (!lock_flags)
1582                                 error("Error: no DAV locking support on %s",
1583                                       remote->url);
1584
1585                 } else {
1586                         error("Cannot access URL %s, return code %d",
1587                               remote->url, results.curl_result);
1588                         lock_flags = 0;
1589                 }
1590         } else {
1591                 error("Unable to start PROPFIND request on %s", remote->url);
1592         }
1593
1594         strbuf_release(&out_buffer.buf);
1595         strbuf_release(&in_buffer);
1596         curl_slist_free_all(dav_headers);
1597
1598         return lock_flags;
1599 }
1600
1601 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1602 {
1603         struct object_list *entry = xmalloc(sizeof(struct object_list));
1604         entry->item = obj;
1605         entry->next = *p;
1606         *p = entry;
1607         return &entry->next;
1608 }
1609
1610 static struct object_list **process_blob(struct blob *blob,
1611                                          struct object_list **p,
1612                                          struct name_path *path,
1613                                          const char *name)
1614 {
1615         struct object *obj = &blob->object;
1616
1617         obj->flags |= LOCAL;
1618
1619         if (obj->flags & (UNINTERESTING | SEEN))
1620                 return p;
1621
1622         obj->flags |= SEEN;
1623         return add_one_object(obj, p);
1624 }
1625
1626 static struct object_list **process_tree(struct tree *tree,
1627                                          struct object_list **p,
1628                                          struct name_path *path,
1629                                          const char *name)
1630 {
1631         struct object *obj = &tree->object;
1632         struct tree_desc desc;
1633         struct name_entry entry;
1634         struct name_path me;
1635
1636         obj->flags |= LOCAL;
1637
1638         if (obj->flags & (UNINTERESTING | SEEN))
1639                 return p;
1640         if (parse_tree(tree) < 0)
1641                 die("bad tree object %s", sha1_to_hex(obj->sha1));
1642
1643         obj->flags |= SEEN;
1644         name = xstrdup(name);
1645         p = add_one_object(obj, p);
1646         me.up = path;
1647         me.elem = name;
1648         me.elem_len = strlen(name);
1649
1650         init_tree_desc(&desc, tree->buffer, tree->size);
1651
1652         while (tree_entry(&desc, &entry))
1653                 switch (object_type(entry.mode)) {
1654                 case OBJ_TREE:
1655                         p = process_tree(lookup_tree(entry.sha1), p, &me, name);
1656                         break;
1657                 case OBJ_BLOB:
1658                         p = process_blob(lookup_blob(entry.sha1), p, &me, name);
1659                         break;
1660                 default:
1661                         /* Subproject commit - not in this repository */
1662                         break;
1663                 }
1664
1665         free(tree->buffer);
1666         tree->buffer = NULL;
1667         return p;
1668 }
1669
1670 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1671 {
1672         int i;
1673         struct commit *commit;
1674         struct object_list **p = &objects;
1675         int count = 0;
1676
1677         while ((commit = get_revision(revs)) != NULL) {
1678                 p = process_tree(commit->tree, p, NULL, "");
1679                 commit->object.flags |= LOCAL;
1680                 if (!(commit->object.flags & UNINTERESTING))
1681                         count += add_send_request(&commit->object, lock);
1682         }
1683
1684         for (i = 0; i < revs->pending.nr; i++) {
1685                 struct object_array_entry *entry = revs->pending.objects + i;
1686                 struct object *obj = entry->item;
1687                 const char *name = entry->name;
1688
1689                 if (obj->flags & (UNINTERESTING | SEEN))
1690                         continue;
1691                 if (obj->type == OBJ_TAG) {
1692                         obj->flags |= SEEN;
1693                         p = add_one_object(obj, p);
1694                         continue;
1695                 }
1696                 if (obj->type == OBJ_TREE) {
1697                         p = process_tree((struct tree *)obj, p, NULL, name);
1698                         continue;
1699                 }
1700                 if (obj->type == OBJ_BLOB) {
1701                         p = process_blob((struct blob *)obj, p, NULL, name);
1702                         continue;
1703                 }
1704                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1705         }
1706
1707         while (objects) {
1708                 if (!(objects->item->flags & UNINTERESTING))
1709                         count += add_send_request(objects->item, lock);
1710                 objects = objects->next;
1711         }
1712
1713         return count;
1714 }
1715
1716 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1717 {
1718         struct active_request_slot *slot;
1719         struct slot_results results;
1720         char *if_header;
1721         struct buffer out_buffer = { STRBUF_INIT, 0 };
1722         struct curl_slist *dav_headers = NULL;
1723
1724         if_header = xmalloc(strlen(lock->token) + 25);
1725         sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
1726         dav_headers = curl_slist_append(dav_headers, if_header);
1727
1728         strbuf_addf(&out_buffer.buf, "%s\n", sha1_to_hex(sha1));
1729
1730         slot = get_active_slot();
1731         slot->results = &results;
1732         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1733         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1734         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1735         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1736         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1737         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1738         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1739         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1740         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1741
1742         if (start_active_slot(slot)) {
1743                 run_active_slot(slot);
1744                 strbuf_release(&out_buffer.buf);
1745                 free(if_header);
1746                 if (results.curl_result != CURLE_OK) {
1747                         fprintf(stderr,
1748                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1749                                 results.curl_result, results.http_code);
1750                         /* We should attempt recovery? */
1751                         return 0;
1752                 }
1753         } else {
1754                 strbuf_release(&out_buffer.buf);
1755                 free(if_header);
1756                 fprintf(stderr, "Unable to start PUT request\n");
1757                 return 0;
1758         }
1759
1760         return 1;
1761 }
1762
1763 static struct ref *local_refs, **local_tail;
1764 static struct ref *remote_refs, **remote_tail;
1765
1766 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1767 {
1768         struct ref *ref;
1769         int len = strlen(refname) + 1;
1770         ref = xcalloc(1, sizeof(*ref) + len);
1771         hashcpy(ref->new_sha1, sha1);
1772         memcpy(ref->name, refname, len);
1773         *local_tail = ref;
1774         local_tail = &ref->next;
1775         return 0;
1776 }
1777
1778 static void one_remote_ref(char *refname)
1779 {
1780         struct ref *ref;
1781         struct object *obj;
1782
1783         ref = alloc_ref_from_str(refname);
1784
1785         if (http_fetch_ref(remote->url, ref) != 0) {
1786                 fprintf(stderr,
1787                         "Unable to fetch ref %s from %s\n",
1788                         refname, remote->url);
1789                 free(ref);
1790                 return;
1791         }
1792
1793         /*
1794          * Fetch a copy of the object if it doesn't exist locally - it
1795          * may be required for updating server info later.
1796          */
1797         if (remote->can_update_info_refs && !has_sha1_file(ref->old_sha1)) {
1798                 obj = lookup_unknown_object(ref->old_sha1);
1799                 if (obj) {
1800                         fprintf(stderr, "  fetch %s for %s\n",
1801                                 sha1_to_hex(ref->old_sha1), refname);
1802                         add_fetch_request(obj);
1803                 }
1804         }
1805
1806         *remote_tail = ref;
1807         remote_tail = &ref->next;
1808 }
1809
1810 static void get_local_heads(void)
1811 {
1812         local_tail = &local_refs;
1813         for_each_ref(one_local_ref, NULL);
1814 }
1815
1816 static void get_dav_remote_heads(void)
1817 {
1818         remote_tail = &remote_refs;
1819         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1820 }
1821
1822 static int is_zero_sha1(const unsigned char *sha1)
1823 {
1824         int i;
1825
1826         for (i = 0; i < 20; i++) {
1827                 if (*sha1++)
1828                         return 0;
1829         }
1830         return 1;
1831 }
1832
1833 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1834 {
1835         while (list) {
1836                 struct commit_list *temp = list;
1837                 temp->item->object.flags &= ~mark;
1838                 list = temp->next;
1839                 free(temp);
1840         }
1841 }
1842
1843 static int ref_newer(const unsigned char *new_sha1,
1844                      const unsigned char *old_sha1)
1845 {
1846         struct object *o;
1847         struct commit *old, *new;
1848         struct commit_list *list, *used;
1849         int found = 0;
1850
1851         /* Both new and old must be commit-ish and new is descendant of
1852          * old.  Otherwise we require --force.
1853          */
1854         o = deref_tag(parse_object(old_sha1), NULL, 0);
1855         if (!o || o->type != OBJ_COMMIT)
1856                 return 0;
1857         old = (struct commit *) o;
1858
1859         o = deref_tag(parse_object(new_sha1), NULL, 0);
1860         if (!o || o->type != OBJ_COMMIT)
1861                 return 0;
1862         new = (struct commit *) o;
1863
1864         if (parse_commit(new) < 0)
1865                 return 0;
1866
1867         used = list = NULL;
1868         commit_list_insert(new, &list);
1869         while (list) {
1870                 new = pop_most_recent_commit(&list, TMP_MARK);
1871                 commit_list_insert(new, &used);
1872                 if (new == old) {
1873                         found = 1;
1874                         break;
1875                 }
1876         }
1877         unmark_and_free(list, TMP_MARK);
1878         unmark_and_free(used, TMP_MARK);
1879         return found;
1880 }
1881
1882 static void add_remote_info_ref(struct remote_ls_ctx *ls)
1883 {
1884         struct strbuf *buf = (struct strbuf *)ls->userData;
1885         struct object *o;
1886         int len;
1887         char *ref_info;
1888         struct ref *ref;
1889
1890         ref = alloc_ref_from_str(ls->dentry_name);
1891
1892         if (http_fetch_ref(remote->url, ref) != 0) {
1893                 fprintf(stderr,
1894                         "Unable to fetch ref %s from %s\n",
1895                         ls->dentry_name, remote->url);
1896                 aborted = 1;
1897                 free(ref);
1898                 return;
1899         }
1900
1901         o = parse_object(ref->old_sha1);
1902         if (!o) {
1903                 fprintf(stderr,
1904                         "Unable to parse object %s for remote ref %s\n",
1905                         sha1_to_hex(ref->old_sha1), ls->dentry_name);
1906                 aborted = 1;
1907                 free(ref);
1908                 return;
1909         }
1910
1911         len = strlen(ls->dentry_name) + 42;
1912         ref_info = xcalloc(len + 1, 1);
1913         sprintf(ref_info, "%s   %s\n",
1914                 sha1_to_hex(ref->old_sha1), ls->dentry_name);
1915         fwrite_buffer(ref_info, 1, len, buf);
1916         free(ref_info);
1917
1918         if (o->type == OBJ_TAG) {
1919                 o = deref_tag(o, ls->dentry_name, 0);
1920                 if (o) {
1921                         len = strlen(ls->dentry_name) + 45;
1922                         ref_info = xcalloc(len + 1, 1);
1923                         sprintf(ref_info, "%s   %s^{}\n",
1924                                 sha1_to_hex(o->sha1), ls->dentry_name);
1925                         fwrite_buffer(ref_info, 1, len, buf);
1926                         free(ref_info);
1927                 }
1928         }
1929         free(ref);
1930 }
1931
1932 static void update_remote_info_refs(struct remote_lock *lock)
1933 {
1934         struct buffer buffer = { STRBUF_INIT, 0 };
1935         struct active_request_slot *slot;
1936         struct slot_results results;
1937         char *if_header;
1938         struct curl_slist *dav_headers = NULL;
1939
1940         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
1941                   add_remote_info_ref, &buffer.buf);
1942         if (!aborted) {
1943                 if_header = xmalloc(strlen(lock->token) + 25);
1944                 sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
1945                 dav_headers = curl_slist_append(dav_headers, if_header);
1946
1947                 slot = get_active_slot();
1948                 slot->results = &results;
1949                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, &buffer);
1950                 curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, buffer.buf.len);
1951                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1952                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1953                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1954                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1955                 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1956                 curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1957                 curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1958
1959                 if (start_active_slot(slot)) {
1960                         run_active_slot(slot);
1961                         if (results.curl_result != CURLE_OK) {
1962                                 fprintf(stderr,
1963                                         "PUT error: curl result=%d, HTTP code=%ld\n",
1964                                         results.curl_result, results.http_code);
1965                         }
1966                 }
1967                 free(if_header);
1968         }
1969         strbuf_release(&buffer.buf);
1970 }
1971
1972 static int remote_exists(const char *path)
1973 {
1974         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1975         struct active_request_slot *slot;
1976         struct slot_results results;
1977         int ret = -1;
1978
1979         sprintf(url, "%s%s", remote->url, path);
1980
1981         slot = get_active_slot();
1982         slot->results = &results;
1983         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1984         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1985
1986         if (start_active_slot(slot)) {
1987                 run_active_slot(slot);
1988                 if (results.http_code == 404)
1989                         ret = 0;
1990                 else if (results.curl_result == CURLE_OK)
1991                         ret = 1;
1992                 else
1993                         fprintf(stderr, "HEAD HTTP error %ld\n", results.http_code);
1994         } else {
1995                 fprintf(stderr, "Unable to start HEAD request\n");
1996         }
1997
1998         free(url);
1999         return ret;
2000 }
2001
2002 static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
2003 {
2004         char *url;
2005         struct strbuf buffer = STRBUF_INIT;
2006         struct active_request_slot *slot;
2007         struct slot_results results;
2008
2009         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
2010         sprintf(url, "%s%s", remote->url, path);
2011
2012         slot = get_active_slot();
2013         slot->results = &results;
2014         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
2015         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
2016         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
2017         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2018         if (start_active_slot(slot)) {
2019                 run_active_slot(slot);
2020                 if (results.curl_result != CURLE_OK) {
2021                         die("Couldn't get %s for remote symref\n%s",
2022                             url, curl_errorstr);
2023                 }
2024         } else {
2025                 die("Unable to start remote symref request");
2026         }
2027         free(url);
2028
2029         free(*symref);
2030         *symref = NULL;
2031         hashclr(sha1);
2032
2033         if (buffer.len == 0)
2034                 return;
2035
2036         /* If it's a symref, set the refname; otherwise try for a sha1 */
2037         if (!prefixcmp((char *)buffer.buf, "ref: ")) {
2038                 *symref = xmemdupz((char *)buffer.buf + 5, buffer.len - 6);
2039         } else {
2040                 get_sha1_hex(buffer.buf, sha1);
2041         }
2042
2043         strbuf_release(&buffer);
2044 }
2045
2046 static int verify_merge_base(unsigned char *head_sha1, unsigned char *branch_sha1)
2047 {
2048         struct commit *head = lookup_commit(head_sha1);
2049         struct commit *branch = lookup_commit(branch_sha1);
2050         struct commit_list *merge_bases = get_merge_bases(head, branch, 1);
2051
2052         return (merge_bases && !merge_bases->next && merge_bases->item == branch);
2053 }
2054
2055 static int delete_remote_branch(char *pattern, int force)
2056 {
2057         struct ref *refs = remote_refs;
2058         struct ref *remote_ref = NULL;
2059         unsigned char head_sha1[20];
2060         char *symref = NULL;
2061         int match;
2062         int patlen = strlen(pattern);
2063         int i;
2064         struct active_request_slot *slot;
2065         struct slot_results results;
2066         char *url;
2067
2068         /* Find the remote branch(es) matching the specified branch name */
2069         for (match = 0; refs; refs = refs->next) {
2070                 char *name = refs->name;
2071                 int namelen = strlen(name);
2072                 if (namelen < patlen ||
2073                     memcmp(name + namelen - patlen, pattern, patlen))
2074                         continue;
2075                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
2076                         continue;
2077                 match++;
2078                 remote_ref = refs;
2079         }
2080         if (match == 0)
2081                 return error("No remote branch matches %s", pattern);
2082         if (match != 1)
2083                 return error("More than one remote branch matches %s",
2084                              pattern);
2085
2086         /*
2087          * Remote HEAD must be a symref (not exactly foolproof; a remote
2088          * symlink to a symref will look like a symref)
2089          */
2090         fetch_symref("HEAD", &symref, head_sha1);
2091         if (!symref)
2092                 return error("Remote HEAD is not a symref");
2093
2094         /* Remote branch must not be the remote HEAD */
2095         for (i=0; symref && i<MAXDEPTH; i++) {
2096                 if (!strcmp(remote_ref->name, symref))
2097                         return error("Remote branch %s is the current HEAD",
2098                                      remote_ref->name);
2099                 fetch_symref(symref, &symref, head_sha1);
2100         }
2101
2102         /* Run extra sanity checks if delete is not forced */
2103         if (!force) {
2104                 /* Remote HEAD must resolve to a known object */
2105                 if (symref)
2106                         return error("Remote HEAD symrefs too deep");
2107                 if (is_zero_sha1(head_sha1))
2108                         return error("Unable to resolve remote HEAD");
2109                 if (!has_sha1_file(head_sha1))
2110                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
2111
2112                 /* Remote branch must resolve to a known object */
2113                 if (is_zero_sha1(remote_ref->old_sha1))
2114                         return error("Unable to resolve remote branch %s",
2115                                      remote_ref->name);
2116                 if (!has_sha1_file(remote_ref->old_sha1))
2117                         return error("Remote branch %s resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", remote_ref->name, sha1_to_hex(remote_ref->old_sha1));
2118
2119                 /* Remote branch must be an ancestor of remote HEAD */
2120                 if (!verify_merge_base(head_sha1, remote_ref->old_sha1)) {
2121                         return error("The branch '%s' is not an ancestor "
2122                                      "of your current HEAD.\n"
2123                                      "If you are sure you want to delete it,"
2124                                      " run:\n\t'git http-push -D %s %s'",
2125                                      remote_ref->name, remote->url, pattern);
2126                 }
2127         }
2128
2129         /* Send delete request */
2130         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
2131         if (dry_run)
2132                 return 0;
2133         url = xmalloc(strlen(remote->url) + strlen(remote_ref->name) + 1);
2134         sprintf(url, "%s%s", remote->url, remote_ref->name);
2135         slot = get_active_slot();
2136         slot->results = &results;
2137         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
2138         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2139         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2140         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_DELETE);
2141         if (start_active_slot(slot)) {
2142                 run_active_slot(slot);
2143                 free(url);
2144                 if (results.curl_result != CURLE_OK)
2145                         return error("DELETE request failed (%d/%ld)\n",
2146                                      results.curl_result, results.http_code);
2147         } else {
2148                 free(url);
2149                 return error("Unable to start DELETE request");
2150         }
2151
2152         return 0;
2153 }
2154
2155 int main(int argc, char **argv)
2156 {
2157         struct transfer_request *request;
2158         struct transfer_request *next_request;
2159         int nr_refspec = 0;
2160         char **refspec = NULL;
2161         struct remote_lock *ref_lock = NULL;
2162         struct remote_lock *info_ref_lock = NULL;
2163         struct rev_info revs;
2164         int delete_branch = 0;
2165         int force_delete = 0;
2166         int objects_to_send;
2167         int rc = 0;
2168         int i;
2169         int new_refs;
2170         struct ref *ref;
2171         char *rewritten_url = NULL;
2172
2173         setup_git_directory();
2174
2175         remote = xcalloc(sizeof(*remote), 1);
2176
2177         argv++;
2178         for (i = 1; i < argc; i++, argv++) {
2179                 char *arg = *argv;
2180
2181                 if (*arg == '-') {
2182                         if (!strcmp(arg, "--all")) {
2183                                 push_all = MATCH_REFS_ALL;
2184                                 continue;
2185                         }
2186                         if (!strcmp(arg, "--force")) {
2187                                 force_all = 1;
2188                                 continue;
2189                         }
2190                         if (!strcmp(arg, "--dry-run")) {
2191                                 dry_run = 1;
2192                                 continue;
2193                         }
2194                         if (!strcmp(arg, "--verbose")) {
2195                                 push_verbosely = 1;
2196                                 continue;
2197                         }
2198                         if (!strcmp(arg, "-d")) {
2199                                 delete_branch = 1;
2200                                 continue;
2201                         }
2202                         if (!strcmp(arg, "-D")) {
2203                                 delete_branch = 1;
2204                                 force_delete = 1;
2205                                 continue;
2206                         }
2207                 }
2208                 if (!remote->url) {
2209                         char *path = strstr(arg, "//");
2210                         remote->url = arg;
2211                         if (path) {
2212                                 path = strchr(path+2, '/');
2213                                 if (path)
2214                                         remote->path_len = strlen(path);
2215                         }
2216                         continue;
2217                 }
2218                 refspec = argv;
2219                 nr_refspec = argc - i;
2220                 break;
2221         }
2222
2223 #ifndef USE_CURL_MULTI
2224         die("git-push is not available for http/https repository when not compiled with USE_CURL_MULTI");
2225 #endif
2226
2227         if (!remote->url)
2228                 usage(http_push_usage);
2229
2230         if (delete_branch && nr_refspec != 1)
2231                 die("You must specify only one branch name when deleting a remote branch");
2232
2233         memset(remote_dir_exists, -1, 256);
2234
2235         http_init(NULL);
2236
2237         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
2238
2239         if (remote->url && remote->url[strlen(remote->url)-1] != '/') {
2240                 rewritten_url = malloc(strlen(remote->url)+2);
2241                 strcpy(rewritten_url, remote->url);
2242                 strcat(rewritten_url, "/");
2243                 remote->url = rewritten_url;
2244                 ++remote->path_len;
2245         }
2246
2247         /* Verify DAV compliance/lock support */
2248         if (!locking_available()) {
2249                 rc = 1;
2250                 goto cleanup;
2251         }
2252
2253         signal(SIGINT, remove_locks_on_signal);
2254         signal(SIGHUP, remove_locks_on_signal);
2255         signal(SIGQUIT, remove_locks_on_signal);
2256         signal(SIGTERM, remove_locks_on_signal);
2257
2258         /* Check whether the remote has server info files */
2259         remote->can_update_info_refs = 0;
2260         remote->has_info_refs = remote_exists("info/refs");
2261         remote->has_info_packs = remote_exists("objects/info/packs");
2262         if (remote->has_info_refs) {
2263                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
2264                 if (info_ref_lock)
2265                         remote->can_update_info_refs = 1;
2266                 else {
2267                         fprintf(stderr, "Error: cannot lock existing info/refs\n");
2268                         rc = 1;
2269                         goto cleanup;
2270                 }
2271         }
2272         if (remote->has_info_packs)
2273                 fetch_indices();
2274
2275         /* Get a list of all local and remote heads to validate refspecs */
2276         get_local_heads();
2277         fprintf(stderr, "Fetching remote heads...\n");
2278         get_dav_remote_heads();
2279
2280         /* Remove a remote branch if -d or -D was specified */
2281         if (delete_branch) {
2282                 if (delete_remote_branch(refspec[0], force_delete) == -1)
2283                         fprintf(stderr, "Unable to delete remote branch %s\n",
2284                                 refspec[0]);
2285                 goto cleanup;
2286         }
2287
2288         /* match them up */
2289         if (!remote_tail)
2290                 remote_tail = &remote_refs;
2291         if (match_refs(local_refs, remote_refs, &remote_tail,
2292                        nr_refspec, (const char **) refspec, push_all)) {
2293                 rc = -1;
2294                 goto cleanup;
2295         }
2296         if (!remote_refs) {
2297                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
2298                 rc = 0;
2299                 goto cleanup;
2300         }
2301
2302         new_refs = 0;
2303         for (ref = remote_refs; ref; ref = ref->next) {
2304                 char old_hex[60], *new_hex;
2305                 const char *commit_argv[4];
2306                 int commit_argc;
2307                 char *new_sha1_hex, *old_sha1_hex;
2308
2309                 if (!ref->peer_ref)
2310                         continue;
2311
2312                 if (is_zero_sha1(ref->peer_ref->new_sha1)) {
2313                         if (delete_remote_branch(ref->name, 1) == -1) {
2314                                 error("Could not remove %s", ref->name);
2315                                 rc = -4;
2316                         }
2317                         new_refs++;
2318                         continue;
2319                 }
2320
2321                 if (!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
2322                         if (push_verbosely || 1)
2323                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
2324                         continue;
2325                 }
2326
2327                 if (!force_all &&
2328                     !is_zero_sha1(ref->old_sha1) &&
2329                     !ref->force) {
2330                         if (!has_sha1_file(ref->old_sha1) ||
2331                             !ref_newer(ref->peer_ref->new_sha1,
2332                                        ref->old_sha1)) {
2333                                 /*
2334                                  * We do not have the remote ref, or
2335                                  * we know that the remote ref is not
2336                                  * an ancestor of what we are trying to
2337                                  * push.  Either way this can be losing
2338                                  * commits at the remote end and likely
2339                                  * we were not up to date to begin with.
2340                                  */
2341                                 error("remote '%s' is not an ancestor of\n"
2342                                       "local '%s'.\n"
2343                                       "Maybe you are not up-to-date and "
2344                                       "need to pull first?",
2345                                       ref->name,
2346                                       ref->peer_ref->name);
2347                                 rc = -2;
2348                                 continue;
2349                         }
2350                 }
2351                 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
2352                 new_refs++;
2353                 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
2354                 new_hex = sha1_to_hex(ref->new_sha1);
2355
2356                 fprintf(stderr, "updating '%s'", ref->name);
2357                 if (strcmp(ref->name, ref->peer_ref->name))
2358                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
2359                 fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
2360                 if (dry_run)
2361                         continue;
2362
2363                 /* Lock remote branch ref */
2364                 ref_lock = lock_remote(ref->name, LOCK_TIME);
2365                 if (ref_lock == NULL) {
2366                         fprintf(stderr, "Unable to lock remote branch %s\n",
2367                                 ref->name);
2368                         rc = 1;
2369                         continue;
2370                 }
2371
2372                 /* Set up revision info for this refspec */
2373                 commit_argc = 3;
2374                 new_sha1_hex = xstrdup(sha1_to_hex(ref->new_sha1));
2375                 old_sha1_hex = NULL;
2376                 commit_argv[1] = "--objects";
2377                 commit_argv[2] = new_sha1_hex;
2378                 if (!push_all && !is_zero_sha1(ref->old_sha1)) {
2379                         old_sha1_hex = xmalloc(42);
2380                         sprintf(old_sha1_hex, "^%s",
2381                                 sha1_to_hex(ref->old_sha1));
2382                         commit_argv[3] = old_sha1_hex;
2383                         commit_argc++;
2384                 }
2385                 init_revisions(&revs, setup_git_directory());
2386                 setup_revisions(commit_argc, commit_argv, &revs, NULL);
2387                 revs.edge_hint = 0; /* just in case */
2388                 free(new_sha1_hex);
2389                 if (old_sha1_hex) {
2390                         free(old_sha1_hex);
2391                         commit_argv[1] = NULL;
2392                 }
2393
2394                 /* Generate a list of objects that need to be pushed */
2395                 pushing = 0;
2396                 if (prepare_revision_walk(&revs))
2397                         die("revision walk setup failed");
2398                 mark_edges_uninteresting(revs.commits, &revs, NULL);
2399                 objects_to_send = get_delta(&revs, ref_lock);
2400                 finish_all_active_slots();
2401
2402                 /* Push missing objects to remote, this would be a
2403                    convenient time to pack them first if appropriate. */
2404                 pushing = 1;
2405                 if (objects_to_send)
2406                         fprintf(stderr, "    sending %d objects\n",
2407                                 objects_to_send);
2408 #ifdef USE_CURL_MULTI
2409                 fill_active_slots();
2410                 add_fill_function(NULL, fill_active_slot);
2411 #endif
2412                 do {
2413                         finish_all_active_slots();
2414 #ifdef USE_CURL_MULTI
2415                         fill_active_slots();
2416 #endif
2417                 } while (request_queue_head && !aborted);
2418
2419                 /* Update the remote branch if all went well */
2420                 if (aborted || !update_remote(ref->new_sha1, ref_lock))
2421                         rc = 1;
2422
2423                 if (!rc)
2424                         fprintf(stderr, "    done\n");
2425                 unlock_remote(ref_lock);
2426                 check_locks();
2427         }
2428
2429         /* Update remote server info if appropriate */
2430         if (remote->has_info_refs && new_refs) {
2431                 if (info_ref_lock && remote->can_update_info_refs) {
2432                         fprintf(stderr, "Updating remote server info\n");
2433                         if (!dry_run)
2434                                 update_remote_info_refs(info_ref_lock);
2435                 } else {
2436                         fprintf(stderr, "Unable to update server info\n");
2437                 }
2438         }
2439
2440  cleanup:
2441         free(rewritten_url);
2442         if (info_ref_lock)
2443                 unlock_remote(info_ref_lock);
2444         free(remote);
2445
2446         curl_slist_free_all(no_pragma_header);
2447
2448         http_cleanup();
2449
2450         request = request_queue_head;
2451         while (request != NULL) {
2452                 next_request = request->next;
2453                 release_request(request);
2454                 request = next_request;
2455         }
2456
2457         return rc;
2458 }