Merge branch 'wk/doc-pre-rebase'
[git] / http-push.c
1 #include "cache.h"
2 #include "commit.h"
3 #include "tag.h"
4 #include "blob.h"
5 #include "http.h"
6 #include "refs.h"
7 #include "diff.h"
8 #include "revision.h"
9 #include "exec_cmd.h"
10 #include "remote.h"
11 #include "list-objects.h"
12 #include "sigchain.h"
13
14 #ifdef EXPAT_NEEDS_XMLPARSE_H
15 #include <xmlparse.h>
16 #else
17 #include <expat.h>
18 #endif
19
20 static const char http_push_usage[] =
21 "git http-push [--all] [--dry-run] [--force] [--verbose] <remote> [<head>...]\n";
22
23 #ifndef XML_STATUS_OK
24 enum XML_Status {
25   XML_STATUS_OK = 1,
26   XML_STATUS_ERROR = 0
27 };
28 #define XML_STATUS_OK    1
29 #define XML_STATUS_ERROR 0
30 #endif
31
32 #define PREV_BUF_SIZE 4096
33
34 /* DAV methods */
35 #define DAV_LOCK "LOCK"
36 #define DAV_MKCOL "MKCOL"
37 #define DAV_MOVE "MOVE"
38 #define DAV_PROPFIND "PROPFIND"
39 #define DAV_PUT "PUT"
40 #define DAV_UNLOCK "UNLOCK"
41 #define DAV_DELETE "DELETE"
42
43 /* DAV lock flags */
44 #define DAV_PROP_LOCKWR (1u << 0)
45 #define DAV_PROP_LOCKEX (1u << 1)
46 #define DAV_LOCK_OK (1u << 2)
47
48 /* DAV XML properties */
49 #define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
50 #define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
51 #define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
52 #define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
53 #define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
54 #define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
55 #define DAV_PROPFIND_RESP ".multistatus.response"
56 #define DAV_PROPFIND_NAME ".multistatus.response.href"
57 #define DAV_PROPFIND_COLLECTION ".multistatus.response.propstat.prop.resourcetype.collection"
58
59 /* DAV request body templates */
60 #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>"
61 #define PROPFIND_ALL_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/>\n</D:propfind>"
62 #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>"
63
64 #define LOCK_TIME 600
65 #define LOCK_REFRESH 30
66
67 /* bits #0-15 in revision.h */
68
69 #define LOCAL    (1u<<16)
70 #define REMOTE   (1u<<17)
71 #define FETCHING (1u<<18)
72 #define PUSHING  (1u<<19)
73
74 /* We allow "recursive" symbolic refs. Only within reason, though */
75 #define MAXDEPTH 5
76
77 static int pushing;
78 static int aborted;
79 static signed char remote_dir_exists[256];
80
81 static int push_verbosely;
82 static int push_all = MATCH_REFS_NONE;
83 static int force_all;
84 static int dry_run;
85 static int helper_status;
86
87 static struct object_list *objects;
88
89 struct repo {
90         char *url;
91         char *path;
92         int path_len;
93         int has_info_refs;
94         int can_update_info_refs;
95         int has_info_packs;
96         struct packed_git *packs;
97         struct remote_lock *locks;
98 };
99
100 static struct repo *repo;
101
102 enum transfer_state {
103         NEED_FETCH,
104         RUN_FETCH_LOOSE,
105         RUN_FETCH_PACKED,
106         NEED_PUSH,
107         RUN_MKCOL,
108         RUN_PUT,
109         RUN_MOVE,
110         ABORTED,
111         COMPLETE
112 };
113
114 struct transfer_request {
115         struct object *obj;
116         char *url;
117         char *dest;
118         struct remote_lock *lock;
119         struct curl_slist *headers;
120         struct buffer buffer;
121         enum transfer_state state;
122         CURLcode curl_result;
123         char errorstr[CURL_ERROR_SIZE];
124         long http_code;
125         void *userData;
126         struct active_request_slot *slot;
127         struct transfer_request *next;
128 };
129
130 static struct transfer_request *request_queue_head;
131
132 struct xml_ctx {
133         char *name;
134         int len;
135         char *cdata;
136         void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
137         void *userData;
138 };
139
140 struct remote_lock {
141         char *url;
142         char *owner;
143         char *token;
144         char tmpfile_suffix[41];
145         time_t start_time;
146         long timeout;
147         int refreshing;
148         struct remote_lock *next;
149 };
150
151 /* Flags that control remote_ls processing */
152 #define PROCESS_FILES (1u << 0)
153 #define PROCESS_DIRS  (1u << 1)
154 #define RECURSIVE     (1u << 2)
155
156 /* Flags that remote_ls passes to callback functions */
157 #define IS_DIR (1u << 0)
158
159 struct remote_ls_ctx {
160         char *path;
161         void (*userFunc)(struct remote_ls_ctx *ls);
162         void *userData;
163         int flags;
164         char *dentry_name;
165         int dentry_flags;
166         struct remote_ls_ctx *parent;
167 };
168
169 /* get_dav_token_headers options */
170 enum dav_header_flag {
171         DAV_HEADER_IF = (1u << 0),
172         DAV_HEADER_LOCK = (1u << 1),
173         DAV_HEADER_TIMEOUT = (1u << 2)
174 };
175
176 static char *xml_entities(const char *s)
177 {
178         struct strbuf buf = STRBUF_INIT;
179         strbuf_addstr_xml_quoted(&buf, s);
180         return strbuf_detach(&buf, NULL);
181 }
182
183 static void curl_setup_http_get(CURL *curl, const char *url,
184                 const char *custom_req)
185 {
186         curl_easy_setopt(curl, CURLOPT_HTTPGET, 1);
187         curl_easy_setopt(curl, CURLOPT_URL, url);
188         curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, custom_req);
189         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_null);
190 }
191
192 static void curl_setup_http(CURL *curl, const char *url,
193                 const char *custom_req, struct buffer *buffer,
194                 curl_write_callback write_fn)
195 {
196         curl_easy_setopt(curl, CURLOPT_PUT, 1);
197         curl_easy_setopt(curl, CURLOPT_URL, url);
198         curl_easy_setopt(curl, CURLOPT_INFILE, buffer);
199         curl_easy_setopt(curl, CURLOPT_INFILESIZE, buffer->buf.len);
200         curl_easy_setopt(curl, CURLOPT_READFUNCTION, fread_buffer);
201 #ifndef NO_CURL_IOCTL
202         curl_easy_setopt(curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
203         curl_easy_setopt(curl, CURLOPT_IOCTLDATA, &buffer);
204 #endif
205         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_fn);
206         curl_easy_setopt(curl, CURLOPT_NOBODY, 0);
207         curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, custom_req);
208         curl_easy_setopt(curl, CURLOPT_UPLOAD, 1);
209 }
210
211 static struct curl_slist *get_dav_token_headers(struct remote_lock *lock, enum dav_header_flag options)
212 {
213         struct strbuf buf = STRBUF_INIT;
214         struct curl_slist *dav_headers = NULL;
215
216         if (options & DAV_HEADER_IF) {
217                 strbuf_addf(&buf, "If: (<%s>)", lock->token);
218                 dav_headers = curl_slist_append(dav_headers, buf.buf);
219                 strbuf_reset(&buf);
220         }
221         if (options & DAV_HEADER_LOCK) {
222                 strbuf_addf(&buf, "Lock-Token: <%s>", lock->token);
223                 dav_headers = curl_slist_append(dav_headers, buf.buf);
224                 strbuf_reset(&buf);
225         }
226         if (options & DAV_HEADER_TIMEOUT) {
227                 strbuf_addf(&buf, "Timeout: Second-%ld", lock->timeout);
228                 dav_headers = curl_slist_append(dav_headers, buf.buf);
229                 strbuf_reset(&buf);
230         }
231         strbuf_release(&buf);
232
233         return dav_headers;
234 }
235
236 static void finish_request(struct transfer_request *request);
237 static void release_request(struct transfer_request *request);
238
239 static void process_response(void *callback_data)
240 {
241         struct transfer_request *request =
242                 (struct transfer_request *)callback_data;
243
244         finish_request(request);
245 }
246
247 #ifdef USE_CURL_MULTI
248
249 static void start_fetch_loose(struct transfer_request *request)
250 {
251         struct active_request_slot *slot;
252         struct http_object_request *obj_req;
253
254         obj_req = new_http_object_request(repo->url, request->obj->sha1);
255         if (obj_req == NULL) {
256                 request->state = ABORTED;
257                 return;
258         }
259
260         slot = obj_req->slot;
261         slot->callback_func = process_response;
262         slot->callback_data = request;
263         request->slot = slot;
264         request->userData = obj_req;
265
266         /* Try to get the request started, abort the request on error */
267         request->state = RUN_FETCH_LOOSE;
268         if (!start_active_slot(slot)) {
269                 fprintf(stderr, "Unable to start GET request\n");
270                 repo->can_update_info_refs = 0;
271                 release_http_object_request(obj_req);
272                 release_request(request);
273         }
274 }
275
276 static void start_mkcol(struct transfer_request *request)
277 {
278         char *hex = sha1_to_hex(request->obj->sha1);
279         struct active_request_slot *slot;
280
281         request->url = get_remote_object_url(repo->url, hex, 1);
282
283         slot = get_active_slot();
284         slot->callback_func = process_response;
285         slot->callback_data = request;
286         curl_setup_http_get(slot->curl, request->url, DAV_MKCOL);
287         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
288
289         if (start_active_slot(slot)) {
290                 request->slot = slot;
291                 request->state = RUN_MKCOL;
292         } else {
293                 request->state = ABORTED;
294                 free(request->url);
295                 request->url = NULL;
296         }
297 }
298 #endif
299
300 static void start_fetch_packed(struct transfer_request *request)
301 {
302         struct packed_git *target;
303
304         struct transfer_request *check_request = request_queue_head;
305         struct http_pack_request *preq;
306
307         target = find_sha1_pack(request->obj->sha1, repo->packs);
308         if (!target) {
309                 fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", sha1_to_hex(request->obj->sha1));
310                 repo->can_update_info_refs = 0;
311                 release_request(request);
312                 return;
313         }
314
315         fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
316         fprintf(stderr, " which contains %s\n", sha1_to_hex(request->obj->sha1));
317
318         preq = new_http_pack_request(target, repo->url);
319         if (preq == NULL) {
320                 release_http_pack_request(preq);
321                 repo->can_update_info_refs = 0;
322                 return;
323         }
324         preq->lst = &repo->packs;
325
326         /* Make sure there isn't another open request for this pack */
327         while (check_request) {
328                 if (check_request->state == RUN_FETCH_PACKED &&
329                     !strcmp(check_request->url, preq->url)) {
330                         release_http_pack_request(preq);
331                         release_request(request);
332                         return;
333                 }
334                 check_request = check_request->next;
335         }
336
337         preq->slot->callback_func = process_response;
338         preq->slot->callback_data = request;
339         request->slot = preq->slot;
340         request->userData = preq;
341
342         /* Try to get the request started, abort the request on error */
343         request->state = RUN_FETCH_PACKED;
344         if (!start_active_slot(preq->slot)) {
345                 fprintf(stderr, "Unable to start GET request\n");
346                 release_http_pack_request(preq);
347                 repo->can_update_info_refs = 0;
348                 release_request(request);
349         }
350 }
351
352 static void start_put(struct transfer_request *request)
353 {
354         char *hex = sha1_to_hex(request->obj->sha1);
355         struct active_request_slot *slot;
356         struct strbuf buf = STRBUF_INIT;
357         enum object_type type;
358         char hdr[50];
359         void *unpacked;
360         unsigned long len;
361         int hdrlen;
362         ssize_t size;
363         git_zstream stream;
364
365         unpacked = read_sha1_file(request->obj->sha1, &type, &len);
366         hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1;
367
368         /* Set it up */
369         memset(&stream, 0, sizeof(stream));
370         git_deflate_init(&stream, zlib_compression_level);
371         size = git_deflate_bound(&stream, len + hdrlen);
372         strbuf_init(&request->buffer.buf, size);
373         request->buffer.posn = 0;
374
375         /* Compress it */
376         stream.next_out = (unsigned char *)request->buffer.buf.buf;
377         stream.avail_out = size;
378
379         /* First header.. */
380         stream.next_in = (void *)hdr;
381         stream.avail_in = hdrlen;
382         while (git_deflate(&stream, 0) == Z_OK)
383                 ; /* nothing */
384
385         /* Then the data itself.. */
386         stream.next_in = unpacked;
387         stream.avail_in = len;
388         while (git_deflate(&stream, Z_FINISH) == Z_OK)
389                 ; /* nothing */
390         git_deflate_end(&stream);
391         free(unpacked);
392
393         request->buffer.buf.len = stream.total_out;
394
395         strbuf_addstr(&buf, "Destination: ");
396         append_remote_object_url(&buf, repo->url, hex, 0);
397         request->dest = strbuf_detach(&buf, NULL);
398
399         append_remote_object_url(&buf, repo->url, hex, 0);
400         strbuf_add(&buf, request->lock->tmpfile_suffix, 41);
401         request->url = strbuf_detach(&buf, NULL);
402
403         slot = get_active_slot();
404         slot->callback_func = process_response;
405         slot->callback_data = request;
406         curl_setup_http(slot->curl, request->url, DAV_PUT,
407                         &request->buffer, fwrite_null);
408
409         if (start_active_slot(slot)) {
410                 request->slot = slot;
411                 request->state = RUN_PUT;
412         } else {
413                 request->state = ABORTED;
414                 free(request->url);
415                 request->url = NULL;
416         }
417 }
418
419 static void start_move(struct transfer_request *request)
420 {
421         struct active_request_slot *slot;
422         struct curl_slist *dav_headers = NULL;
423
424         slot = get_active_slot();
425         slot->callback_func = process_response;
426         slot->callback_data = request;
427         curl_setup_http_get(slot->curl, request->url, DAV_MOVE);
428         dav_headers = curl_slist_append(dav_headers, request->dest);
429         dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
430         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
431
432         if (start_active_slot(slot)) {
433                 request->slot = slot;
434                 request->state = RUN_MOVE;
435         } else {
436                 request->state = ABORTED;
437                 free(request->url);
438                 request->url = NULL;
439         }
440 }
441
442 static int refresh_lock(struct remote_lock *lock)
443 {
444         struct active_request_slot *slot;
445         struct slot_results results;
446         struct curl_slist *dav_headers;
447         int rc = 0;
448
449         lock->refreshing = 1;
450
451         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF | DAV_HEADER_TIMEOUT);
452
453         slot = get_active_slot();
454         slot->results = &results;
455         curl_setup_http_get(slot->curl, lock->url, DAV_LOCK);
456         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
457
458         if (start_active_slot(slot)) {
459                 run_active_slot(slot);
460                 if (results.curl_result != CURLE_OK) {
461                         fprintf(stderr, "LOCK HTTP error %ld\n",
462                                 results.http_code);
463                 } else {
464                         lock->start_time = time(NULL);
465                         rc = 1;
466                 }
467         }
468
469         lock->refreshing = 0;
470         curl_slist_free_all(dav_headers);
471
472         return rc;
473 }
474
475 static void check_locks(void)
476 {
477         struct remote_lock *lock = repo->locks;
478         time_t current_time = time(NULL);
479         int time_remaining;
480
481         while (lock) {
482                 time_remaining = lock->start_time + lock->timeout -
483                         current_time;
484                 if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
485                         if (!refresh_lock(lock)) {
486                                 fprintf(stderr,
487                                         "Unable to refresh lock for %s\n",
488                                         lock->url);
489                                 aborted = 1;
490                                 return;
491                         }
492                 }
493                 lock = lock->next;
494         }
495 }
496
497 static void release_request(struct transfer_request *request)
498 {
499         struct transfer_request *entry = request_queue_head;
500
501         if (request == request_queue_head) {
502                 request_queue_head = request->next;
503         } else {
504                 while (entry->next != NULL && entry->next != request)
505                         entry = entry->next;
506                 if (entry->next == request)
507                         entry->next = entry->next->next;
508         }
509
510         free(request->url);
511         free(request);
512 }
513
514 static void finish_request(struct transfer_request *request)
515 {
516         struct http_pack_request *preq;
517         struct http_object_request *obj_req;
518
519         request->curl_result = request->slot->curl_result;
520         request->http_code = request->slot->http_code;
521         request->slot = NULL;
522
523         /* Keep locks active */
524         check_locks();
525
526         if (request->headers != NULL)
527                 curl_slist_free_all(request->headers);
528
529         /* URL is reused for MOVE after PUT */
530         if (request->state != RUN_PUT) {
531                 free(request->url);
532                 request->url = NULL;
533         }
534
535         if (request->state == RUN_MKCOL) {
536                 if (request->curl_result == CURLE_OK ||
537                     request->http_code == 405) {
538                         remote_dir_exists[request->obj->sha1[0]] = 1;
539                         start_put(request);
540                 } else {
541                         fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
542                                 sha1_to_hex(request->obj->sha1),
543                                 request->curl_result, request->http_code);
544                         request->state = ABORTED;
545                         aborted = 1;
546                 }
547         } else if (request->state == RUN_PUT) {
548                 if (request->curl_result == CURLE_OK) {
549                         start_move(request);
550                 } else {
551                         fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
552                                 sha1_to_hex(request->obj->sha1),
553                                 request->curl_result, request->http_code);
554                         request->state = ABORTED;
555                         aborted = 1;
556                 }
557         } else if (request->state == RUN_MOVE) {
558                 if (request->curl_result == CURLE_OK) {
559                         if (push_verbosely)
560                                 fprintf(stderr, "    sent %s\n",
561                                         sha1_to_hex(request->obj->sha1));
562                         request->obj->flags |= REMOTE;
563                         release_request(request);
564                 } else {
565                         fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
566                                 sha1_to_hex(request->obj->sha1),
567                                 request->curl_result, request->http_code);
568                         request->state = ABORTED;
569                         aborted = 1;
570                 }
571         } else if (request->state == RUN_FETCH_LOOSE) {
572                 obj_req = (struct http_object_request *)request->userData;
573
574                 if (finish_http_object_request(obj_req) == 0)
575                         if (obj_req->rename == 0)
576                                 request->obj->flags |= (LOCAL | REMOTE);
577
578                 /* Try fetching packed if necessary */
579                 if (request->obj->flags & LOCAL) {
580                         release_http_object_request(obj_req);
581                         release_request(request);
582                 } else
583                         start_fetch_packed(request);
584
585         } else if (request->state == RUN_FETCH_PACKED) {
586                 int fail = 1;
587                 if (request->curl_result != CURLE_OK) {
588                         fprintf(stderr, "Unable to get pack file %s\n%s",
589                                 request->url, curl_errorstr);
590                 } else {
591                         preq = (struct http_pack_request *)request->userData;
592
593                         if (preq) {
594                                 if (finish_http_pack_request(preq) == 0)
595                                         fail = 0;
596                                 release_http_pack_request(preq);
597                         }
598                 }
599                 if (fail)
600                         repo->can_update_info_refs = 0;
601                 release_request(request);
602         }
603 }
604
605 #ifdef USE_CURL_MULTI
606 static int is_running_queue;
607 static int fill_active_slot(void *unused)
608 {
609         struct transfer_request *request;
610
611         if (aborted || !is_running_queue)
612                 return 0;
613
614         for (request = request_queue_head; request; request = request->next) {
615                 if (request->state == NEED_FETCH) {
616                         start_fetch_loose(request);
617                         return 1;
618                 } else if (pushing && request->state == NEED_PUSH) {
619                         if (remote_dir_exists[request->obj->sha1[0]] == 1) {
620                                 start_put(request);
621                         } else {
622                                 start_mkcol(request);
623                         }
624                         return 1;
625                 }
626         }
627         return 0;
628 }
629 #endif
630
631 static void get_remote_object_list(unsigned char parent);
632
633 static void add_fetch_request(struct object *obj)
634 {
635         struct transfer_request *request;
636
637         check_locks();
638
639         /*
640          * Don't fetch the object if it's known to exist locally
641          * or is already in the request queue
642          */
643         if (remote_dir_exists[obj->sha1[0]] == -1)
644                 get_remote_object_list(obj->sha1[0]);
645         if (obj->flags & (LOCAL | FETCHING))
646                 return;
647
648         obj->flags |= FETCHING;
649         request = xmalloc(sizeof(*request));
650         request->obj = obj;
651         request->url = NULL;
652         request->lock = NULL;
653         request->headers = NULL;
654         request->state = NEED_FETCH;
655         request->next = request_queue_head;
656         request_queue_head = request;
657
658 #ifdef USE_CURL_MULTI
659         fill_active_slots();
660         step_active_slots();
661 #endif
662 }
663
664 static int add_send_request(struct object *obj, struct remote_lock *lock)
665 {
666         struct transfer_request *request = request_queue_head;
667         struct packed_git *target;
668
669         /* Keep locks active */
670         check_locks();
671
672         /*
673          * Don't push the object if it's known to exist on the remote
674          * or is already in the request queue
675          */
676         if (remote_dir_exists[obj->sha1[0]] == -1)
677                 get_remote_object_list(obj->sha1[0]);
678         if (obj->flags & (REMOTE | PUSHING))
679                 return 0;
680         target = find_sha1_pack(obj->sha1, repo->packs);
681         if (target) {
682                 obj->flags |= REMOTE;
683                 return 0;
684         }
685
686         obj->flags |= PUSHING;
687         request = xmalloc(sizeof(*request));
688         request->obj = obj;
689         request->url = NULL;
690         request->lock = lock;
691         request->headers = NULL;
692         request->state = NEED_PUSH;
693         request->next = request_queue_head;
694         request_queue_head = request;
695
696 #ifdef USE_CURL_MULTI
697         fill_active_slots();
698         step_active_slots();
699 #endif
700
701         return 1;
702 }
703
704 static int fetch_indices(void)
705 {
706         int ret;
707
708         if (push_verbosely)
709                 fprintf(stderr, "Getting pack list\n");
710
711         switch (http_get_info_packs(repo->url, &repo->packs)) {
712         case HTTP_OK:
713         case HTTP_MISSING_TARGET:
714                 ret = 0;
715                 break;
716         default:
717                 ret = -1;
718         }
719
720         return ret;
721 }
722
723 static void one_remote_object(const char *hex)
724 {
725         unsigned char sha1[20];
726         struct object *obj;
727
728         if (get_sha1_hex(hex, sha1) != 0)
729                 return;
730
731         obj = lookup_object(sha1);
732         if (!obj)
733                 obj = parse_object(sha1);
734
735         /* Ignore remote objects that don't exist locally */
736         if (!obj)
737                 return;
738
739         obj->flags |= REMOTE;
740         if (!object_list_contains(objects, obj))
741                 object_list_insert(obj, &objects);
742 }
743
744 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
745 {
746         int *lock_flags = (int *)ctx->userData;
747
748         if (tag_closed) {
749                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
750                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
751                             (*lock_flags & DAV_PROP_LOCKWR)) {
752                                 *lock_flags |= DAV_LOCK_OK;
753                         }
754                         *lock_flags &= DAV_LOCK_OK;
755                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
756                         *lock_flags |= DAV_PROP_LOCKWR;
757                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
758                         *lock_flags |= DAV_PROP_LOCKEX;
759                 }
760         }
761 }
762
763 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
764 {
765         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
766         git_SHA_CTX sha_ctx;
767         unsigned char lock_token_sha1[20];
768
769         if (tag_closed && ctx->cdata) {
770                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
771                         lock->owner = xmalloc(strlen(ctx->cdata) + 1);
772                         strcpy(lock->owner, ctx->cdata);
773                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
774                         if (!prefixcmp(ctx->cdata, "Second-"))
775                                 lock->timeout =
776                                         strtol(ctx->cdata + 7, NULL, 10);
777                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
778                         lock->token = xmalloc(strlen(ctx->cdata) + 1);
779                         strcpy(lock->token, ctx->cdata);
780
781                         git_SHA1_Init(&sha_ctx);
782                         git_SHA1_Update(&sha_ctx, lock->token, strlen(lock->token));
783                         git_SHA1_Final(lock_token_sha1, &sha_ctx);
784
785                         lock->tmpfile_suffix[0] = '_';
786                         memcpy(lock->tmpfile_suffix + 1, sha1_to_hex(lock_token_sha1), 40);
787                 }
788         }
789 }
790
791 static void one_remote_ref(const char *refname);
792
793 static void
794 xml_start_tag(void *userData, const char *name, const char **atts)
795 {
796         struct xml_ctx *ctx = (struct xml_ctx *)userData;
797         const char *c = strchr(name, ':');
798         int new_len;
799
800         if (c == NULL)
801                 c = name;
802         else
803                 c++;
804
805         new_len = strlen(ctx->name) + strlen(c) + 2;
806
807         if (new_len > ctx->len) {
808                 ctx->name = xrealloc(ctx->name, new_len);
809                 ctx->len = new_len;
810         }
811         strcat(ctx->name, ".");
812         strcat(ctx->name, c);
813
814         free(ctx->cdata);
815         ctx->cdata = NULL;
816
817         ctx->userFunc(ctx, 0);
818 }
819
820 static void
821 xml_end_tag(void *userData, const char *name)
822 {
823         struct xml_ctx *ctx = (struct xml_ctx *)userData;
824         const char *c = strchr(name, ':');
825         char *ep;
826
827         ctx->userFunc(ctx, 1);
828
829         if (c == NULL)
830                 c = name;
831         else
832                 c++;
833
834         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
835         *ep = 0;
836 }
837
838 static void
839 xml_cdata(void *userData, const XML_Char *s, int len)
840 {
841         struct xml_ctx *ctx = (struct xml_ctx *)userData;
842         free(ctx->cdata);
843         ctx->cdata = xmemdupz(s, len);
844 }
845
846 static struct remote_lock *lock_remote(const char *path, long timeout)
847 {
848         struct active_request_slot *slot;
849         struct slot_results results;
850         struct buffer out_buffer = { STRBUF_INIT, 0 };
851         struct strbuf in_buffer = STRBUF_INIT;
852         char *url;
853         char *ep;
854         char timeout_header[25];
855         struct remote_lock *lock = NULL;
856         struct curl_slist *dav_headers = NULL;
857         struct xml_ctx ctx;
858         char *escaped;
859
860         url = xmalloc(strlen(repo->url) + strlen(path) + 1);
861         sprintf(url, "%s%s", repo->url, path);
862
863         /* Make sure leading directories exist for the remote ref */
864         ep = strchr(url + strlen(repo->url) + 1, '/');
865         while (ep) {
866                 char saved_character = ep[1];
867                 ep[1] = '\0';
868                 slot = get_active_slot();
869                 slot->results = &results;
870                 curl_setup_http_get(slot->curl, url, DAV_MKCOL);
871                 if (start_active_slot(slot)) {
872                         run_active_slot(slot);
873                         if (results.curl_result != CURLE_OK &&
874                             results.http_code != 405) {
875                                 fprintf(stderr,
876                                         "Unable to create branch path %s\n",
877                                         url);
878                                 free(url);
879                                 return NULL;
880                         }
881                 } else {
882                         fprintf(stderr, "Unable to start MKCOL request\n");
883                         free(url);
884                         return NULL;
885                 }
886                 ep[1] = saved_character;
887                 ep = strchr(ep + 1, '/');
888         }
889
890         escaped = xml_entities(ident_default_email());
891         strbuf_addf(&out_buffer.buf, LOCK_REQUEST, escaped);
892         free(escaped);
893
894         sprintf(timeout_header, "Timeout: Second-%ld", timeout);
895         dav_headers = curl_slist_append(dav_headers, timeout_header);
896         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
897
898         slot = get_active_slot();
899         slot->results = &results;
900         curl_setup_http(slot->curl, url, DAV_LOCK, &out_buffer, fwrite_buffer);
901         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
902         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
903
904         lock = xcalloc(1, sizeof(*lock));
905         lock->timeout = -1;
906
907         if (start_active_slot(slot)) {
908                 run_active_slot(slot);
909                 if (results.curl_result == CURLE_OK) {
910                         XML_Parser parser = XML_ParserCreate(NULL);
911                         enum XML_Status result;
912                         ctx.name = xcalloc(10, 1);
913                         ctx.len = 0;
914                         ctx.cdata = NULL;
915                         ctx.userFunc = handle_new_lock_ctx;
916                         ctx.userData = lock;
917                         XML_SetUserData(parser, &ctx);
918                         XML_SetElementHandler(parser, xml_start_tag,
919                                               xml_end_tag);
920                         XML_SetCharacterDataHandler(parser, xml_cdata);
921                         result = XML_Parse(parser, in_buffer.buf,
922                                            in_buffer.len, 1);
923                         free(ctx.name);
924                         if (result != XML_STATUS_OK) {
925                                 fprintf(stderr, "XML error: %s\n",
926                                         XML_ErrorString(
927                                                 XML_GetErrorCode(parser)));
928                                 lock->timeout = -1;
929                         }
930                         XML_ParserFree(parser);
931                 }
932         } else {
933                 fprintf(stderr, "Unable to start LOCK request\n");
934         }
935
936         curl_slist_free_all(dav_headers);
937         strbuf_release(&out_buffer.buf);
938         strbuf_release(&in_buffer);
939
940         if (lock->token == NULL || lock->timeout <= 0) {
941                 free(lock->token);
942                 free(lock->owner);
943                 free(url);
944                 free(lock);
945                 lock = NULL;
946         } else {
947                 lock->url = url;
948                 lock->start_time = time(NULL);
949                 lock->next = repo->locks;
950                 repo->locks = lock;
951         }
952
953         return lock;
954 }
955
956 static int unlock_remote(struct remote_lock *lock)
957 {
958         struct active_request_slot *slot;
959         struct slot_results results;
960         struct remote_lock *prev = repo->locks;
961         struct curl_slist *dav_headers;
962         int rc = 0;
963
964         dav_headers = get_dav_token_headers(lock, DAV_HEADER_LOCK);
965
966         slot = get_active_slot();
967         slot->results = &results;
968         curl_setup_http_get(slot->curl, lock->url, DAV_UNLOCK);
969         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
970
971         if (start_active_slot(slot)) {
972                 run_active_slot(slot);
973                 if (results.curl_result == CURLE_OK)
974                         rc = 1;
975                 else
976                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
977                                 results.http_code);
978         } else {
979                 fprintf(stderr, "Unable to start UNLOCK request\n");
980         }
981
982         curl_slist_free_all(dav_headers);
983
984         if (repo->locks == lock) {
985                 repo->locks = lock->next;
986         } else {
987                 while (prev && prev->next != lock)
988                         prev = prev->next;
989                 if (prev)
990                         prev->next = prev->next->next;
991         }
992
993         free(lock->owner);
994         free(lock->url);
995         free(lock->token);
996         free(lock);
997
998         return rc;
999 }
1000
1001 static void remove_locks(void)
1002 {
1003         struct remote_lock *lock = repo->locks;
1004
1005         fprintf(stderr, "Removing remote locks...\n");
1006         while (lock) {
1007                 struct remote_lock *next = lock->next;
1008                 unlock_remote(lock);
1009                 lock = next;
1010         }
1011 }
1012
1013 static void remove_locks_on_signal(int signo)
1014 {
1015         remove_locks();
1016         sigchain_pop(signo);
1017         raise(signo);
1018 }
1019
1020 static void remote_ls(const char *path, int flags,
1021                       void (*userFunc)(struct remote_ls_ctx *ls),
1022                       void *userData);
1023
1024 static void process_ls_object(struct remote_ls_ctx *ls)
1025 {
1026         unsigned int *parent = (unsigned int *)ls->userData;
1027         char *path = ls->dentry_name;
1028         char *obj_hex;
1029
1030         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1031                 remote_dir_exists[*parent] = 1;
1032                 return;
1033         }
1034
1035         if (strlen(path) != 49)
1036                 return;
1037         path += 8;
1038         obj_hex = xmalloc(strlen(path));
1039         /* NB: path is not null-terminated, can not use strlcpy here */
1040         memcpy(obj_hex, path, 2);
1041         strcpy(obj_hex + 2, path + 3);
1042         one_remote_object(obj_hex);
1043         free(obj_hex);
1044 }
1045
1046 static void process_ls_ref(struct remote_ls_ctx *ls)
1047 {
1048         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1049                 fprintf(stderr, "  %s\n", ls->dentry_name);
1050                 return;
1051         }
1052
1053         if (!(ls->dentry_flags & IS_DIR))
1054                 one_remote_ref(ls->dentry_name);
1055 }
1056
1057 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1058 {
1059         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1060
1061         if (tag_closed) {
1062                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1063                         if (ls->dentry_flags & IS_DIR) {
1064
1065                                 /* ensure collection names end with slash */
1066                                 str_end_url_with_slash(ls->dentry_name, &ls->dentry_name);
1067
1068                                 if (ls->flags & PROCESS_DIRS) {
1069                                         ls->userFunc(ls);
1070                                 }
1071                                 if (strcmp(ls->dentry_name, ls->path) &&
1072                                     ls->flags & RECURSIVE) {
1073                                         remote_ls(ls->dentry_name,
1074                                                   ls->flags,
1075                                                   ls->userFunc,
1076                                                   ls->userData);
1077                                 }
1078                         } else if (ls->flags & PROCESS_FILES) {
1079                                 ls->userFunc(ls);
1080                         }
1081                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1082                         char *path = ctx->cdata;
1083                         if (*ctx->cdata == 'h') {
1084                                 path = strstr(path, "//");
1085                                 if (path) {
1086                                         path = strchr(path+2, '/');
1087                                 }
1088                         }
1089                         if (path) {
1090                                 const char *url = repo->url;
1091                                 if (repo->path)
1092                                         url = repo->path;
1093                                 if (strncmp(path, url, repo->path_len))
1094                                         error("Parsed path '%s' does not match url: '%s'",
1095                                               path, url);
1096                                 else {
1097                                         path += repo->path_len;
1098                                         ls->dentry_name = xstrdup(path);
1099                                 }
1100                         }
1101                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1102                         ls->dentry_flags |= IS_DIR;
1103                 }
1104         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1105                 free(ls->dentry_name);
1106                 ls->dentry_name = NULL;
1107                 ls->dentry_flags = 0;
1108         }
1109 }
1110
1111 /*
1112  * NEEDSWORK: remote_ls() ignores info/refs on the remote side.  But it
1113  * should _only_ heed the information from that file, instead of trying to
1114  * determine the refs from the remote file system (badly: it does not even
1115  * know about packed-refs).
1116  */
1117 static void remote_ls(const char *path, int flags,
1118                       void (*userFunc)(struct remote_ls_ctx *ls),
1119                       void *userData)
1120 {
1121         char *url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1122         struct active_request_slot *slot;
1123         struct slot_results results;
1124         struct strbuf in_buffer = STRBUF_INIT;
1125         struct buffer out_buffer = { STRBUF_INIT, 0 };
1126         struct curl_slist *dav_headers = NULL;
1127         struct xml_ctx ctx;
1128         struct remote_ls_ctx ls;
1129
1130         ls.flags = flags;
1131         ls.path = xstrdup(path);
1132         ls.dentry_name = NULL;
1133         ls.dentry_flags = 0;
1134         ls.userData = userData;
1135         ls.userFunc = userFunc;
1136
1137         sprintf(url, "%s%s", repo->url, path);
1138
1139         strbuf_addf(&out_buffer.buf, PROPFIND_ALL_REQUEST);
1140
1141         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1142         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1143
1144         slot = get_active_slot();
1145         slot->results = &results;
1146         curl_setup_http(slot->curl, url, DAV_PROPFIND,
1147                         &out_buffer, fwrite_buffer);
1148         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1149         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1150
1151         if (start_active_slot(slot)) {
1152                 run_active_slot(slot);
1153                 if (results.curl_result == CURLE_OK) {
1154                         XML_Parser parser = XML_ParserCreate(NULL);
1155                         enum XML_Status result;
1156                         ctx.name = xcalloc(10, 1);
1157                         ctx.len = 0;
1158                         ctx.cdata = NULL;
1159                         ctx.userFunc = handle_remote_ls_ctx;
1160                         ctx.userData = &ls;
1161                         XML_SetUserData(parser, &ctx);
1162                         XML_SetElementHandler(parser, xml_start_tag,
1163                                               xml_end_tag);
1164                         XML_SetCharacterDataHandler(parser, xml_cdata);
1165                         result = XML_Parse(parser, in_buffer.buf,
1166                                            in_buffer.len, 1);
1167                         free(ctx.name);
1168
1169                         if (result != XML_STATUS_OK) {
1170                                 fprintf(stderr, "XML error: %s\n",
1171                                         XML_ErrorString(
1172                                                 XML_GetErrorCode(parser)));
1173                         }
1174                         XML_ParserFree(parser);
1175                 }
1176         } else {
1177                 fprintf(stderr, "Unable to start PROPFIND request\n");
1178         }
1179
1180         free(ls.path);
1181         free(url);
1182         strbuf_release(&out_buffer.buf);
1183         strbuf_release(&in_buffer);
1184         curl_slist_free_all(dav_headers);
1185 }
1186
1187 static void get_remote_object_list(unsigned char parent)
1188 {
1189         char path[] = "objects/XX/";
1190         static const char hex[] = "0123456789abcdef";
1191         unsigned int val = parent;
1192
1193         path[8] = hex[val >> 4];
1194         path[9] = hex[val & 0xf];
1195         remote_dir_exists[val] = 0;
1196         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1197                   process_ls_object, &val);
1198 }
1199
1200 static int locking_available(void)
1201 {
1202         struct active_request_slot *slot;
1203         struct slot_results results;
1204         struct strbuf in_buffer = STRBUF_INIT;
1205         struct buffer out_buffer = { STRBUF_INIT, 0 };
1206         struct curl_slist *dav_headers = NULL;
1207         struct xml_ctx ctx;
1208         int lock_flags = 0;
1209         char *escaped;
1210
1211         escaped = xml_entities(repo->url);
1212         strbuf_addf(&out_buffer.buf, PROPFIND_SUPPORTEDLOCK_REQUEST, escaped);
1213         free(escaped);
1214
1215         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1216         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1217
1218         slot = get_active_slot();
1219         slot->results = &results;
1220         curl_setup_http(slot->curl, repo->url, DAV_PROPFIND,
1221                         &out_buffer, fwrite_buffer);
1222         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1223         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1224
1225         if (start_active_slot(slot)) {
1226                 run_active_slot(slot);
1227                 if (results.curl_result == CURLE_OK) {
1228                         XML_Parser parser = XML_ParserCreate(NULL);
1229                         enum XML_Status result;
1230                         ctx.name = xcalloc(10, 1);
1231                         ctx.len = 0;
1232                         ctx.cdata = NULL;
1233                         ctx.userFunc = handle_lockprop_ctx;
1234                         ctx.userData = &lock_flags;
1235                         XML_SetUserData(parser, &ctx);
1236                         XML_SetElementHandler(parser, xml_start_tag,
1237                                               xml_end_tag);
1238                         result = XML_Parse(parser, in_buffer.buf,
1239                                            in_buffer.len, 1);
1240                         free(ctx.name);
1241
1242                         if (result != XML_STATUS_OK) {
1243                                 fprintf(stderr, "XML error: %s\n",
1244                                         XML_ErrorString(
1245                                                 XML_GetErrorCode(parser)));
1246                                 lock_flags = 0;
1247                         }
1248                         XML_ParserFree(parser);
1249                         if (!lock_flags)
1250                                 error("no DAV locking support on %s",
1251                                       repo->url);
1252
1253                 } else {
1254                         error("Cannot access URL %s, return code %d",
1255                               repo->url, results.curl_result);
1256                         lock_flags = 0;
1257                 }
1258         } else {
1259                 error("Unable to start PROPFIND request on %s", repo->url);
1260         }
1261
1262         strbuf_release(&out_buffer.buf);
1263         strbuf_release(&in_buffer);
1264         curl_slist_free_all(dav_headers);
1265
1266         return lock_flags;
1267 }
1268
1269 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1270 {
1271         struct object_list *entry = xmalloc(sizeof(struct object_list));
1272         entry->item = obj;
1273         entry->next = *p;
1274         *p = entry;
1275         return &entry->next;
1276 }
1277
1278 static struct object_list **process_blob(struct blob *blob,
1279                                          struct object_list **p,
1280                                          struct name_path *path,
1281                                          const char *name)
1282 {
1283         struct object *obj = &blob->object;
1284
1285         obj->flags |= LOCAL;
1286
1287         if (obj->flags & (UNINTERESTING | SEEN))
1288                 return p;
1289
1290         obj->flags |= SEEN;
1291         return add_one_object(obj, p);
1292 }
1293
1294 static struct object_list **process_tree(struct tree *tree,
1295                                          struct object_list **p,
1296                                          struct name_path *path,
1297                                          const char *name)
1298 {
1299         struct object *obj = &tree->object;
1300         struct tree_desc desc;
1301         struct name_entry entry;
1302         struct name_path me;
1303
1304         obj->flags |= LOCAL;
1305
1306         if (obj->flags & (UNINTERESTING | SEEN))
1307                 return p;
1308         if (parse_tree(tree) < 0)
1309                 die("bad tree object %s", sha1_to_hex(obj->sha1));
1310
1311         obj->flags |= SEEN;
1312         name = xstrdup(name);
1313         p = add_one_object(obj, p);
1314         me.up = path;
1315         me.elem = name;
1316         me.elem_len = strlen(name);
1317
1318         init_tree_desc(&desc, tree->buffer, tree->size);
1319
1320         while (tree_entry(&desc, &entry))
1321                 switch (object_type(entry.mode)) {
1322                 case OBJ_TREE:
1323                         p = process_tree(lookup_tree(entry.sha1), p, &me, name);
1324                         break;
1325                 case OBJ_BLOB:
1326                         p = process_blob(lookup_blob(entry.sha1), p, &me, name);
1327                         break;
1328                 default:
1329                         /* Subproject commit - not in this repository */
1330                         break;
1331                 }
1332
1333         free(tree->buffer);
1334         tree->buffer = NULL;
1335         return p;
1336 }
1337
1338 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1339 {
1340         int i;
1341         struct commit *commit;
1342         struct object_list **p = &objects;
1343         int count = 0;
1344
1345         while ((commit = get_revision(revs)) != NULL) {
1346                 p = process_tree(commit->tree, p, NULL, "");
1347                 commit->object.flags |= LOCAL;
1348                 if (!(commit->object.flags & UNINTERESTING))
1349                         count += add_send_request(&commit->object, lock);
1350         }
1351
1352         for (i = 0; i < revs->pending.nr; i++) {
1353                 struct object_array_entry *entry = revs->pending.objects + i;
1354                 struct object *obj = entry->item;
1355                 const char *name = entry->name;
1356
1357                 if (obj->flags & (UNINTERESTING | SEEN))
1358                         continue;
1359                 if (obj->type == OBJ_TAG) {
1360                         obj->flags |= SEEN;
1361                         p = add_one_object(obj, p);
1362                         continue;
1363                 }
1364                 if (obj->type == OBJ_TREE) {
1365                         p = process_tree((struct tree *)obj, p, NULL, name);
1366                         continue;
1367                 }
1368                 if (obj->type == OBJ_BLOB) {
1369                         p = process_blob((struct blob *)obj, p, NULL, name);
1370                         continue;
1371                 }
1372                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1373         }
1374
1375         while (objects) {
1376                 if (!(objects->item->flags & UNINTERESTING))
1377                         count += add_send_request(objects->item, lock);
1378                 objects = objects->next;
1379         }
1380
1381         return count;
1382 }
1383
1384 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1385 {
1386         struct active_request_slot *slot;
1387         struct slot_results results;
1388         struct buffer out_buffer = { STRBUF_INIT, 0 };
1389         struct curl_slist *dav_headers;
1390
1391         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1392
1393         strbuf_addf(&out_buffer.buf, "%s\n", sha1_to_hex(sha1));
1394
1395         slot = get_active_slot();
1396         slot->results = &results;
1397         curl_setup_http(slot->curl, lock->url, DAV_PUT,
1398                         &out_buffer, fwrite_null);
1399         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1400
1401         if (start_active_slot(slot)) {
1402                 run_active_slot(slot);
1403                 strbuf_release(&out_buffer.buf);
1404                 if (results.curl_result != CURLE_OK) {
1405                         fprintf(stderr,
1406                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1407                                 results.curl_result, results.http_code);
1408                         /* We should attempt recovery? */
1409                         return 0;
1410                 }
1411         } else {
1412                 strbuf_release(&out_buffer.buf);
1413                 fprintf(stderr, "Unable to start PUT request\n");
1414                 return 0;
1415         }
1416
1417         return 1;
1418 }
1419
1420 static struct ref *remote_refs;
1421
1422 static void one_remote_ref(const char *refname)
1423 {
1424         struct ref *ref;
1425         struct object *obj;
1426
1427         ref = alloc_ref(refname);
1428
1429         if (http_fetch_ref(repo->url, ref) != 0) {
1430                 fprintf(stderr,
1431                         "Unable to fetch ref %s from %s\n",
1432                         refname, repo->url);
1433                 free(ref);
1434                 return;
1435         }
1436
1437         /*
1438          * Fetch a copy of the object if it doesn't exist locally - it
1439          * may be required for updating server info later.
1440          */
1441         if (repo->can_update_info_refs && !has_sha1_file(ref->old_sha1)) {
1442                 obj = lookup_unknown_object(ref->old_sha1);
1443                 if (obj) {
1444                         fprintf(stderr, "  fetch %s for %s\n",
1445                                 sha1_to_hex(ref->old_sha1), refname);
1446                         add_fetch_request(obj);
1447                 }
1448         }
1449
1450         ref->next = remote_refs;
1451         remote_refs = ref;
1452 }
1453
1454 static void get_dav_remote_heads(void)
1455 {
1456         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1457 }
1458
1459 static void add_remote_info_ref(struct remote_ls_ctx *ls)
1460 {
1461         struct strbuf *buf = (struct strbuf *)ls->userData;
1462         struct object *o;
1463         int len;
1464         char *ref_info;
1465         struct ref *ref;
1466
1467         ref = alloc_ref(ls->dentry_name);
1468
1469         if (http_fetch_ref(repo->url, ref) != 0) {
1470                 fprintf(stderr,
1471                         "Unable to fetch ref %s from %s\n",
1472                         ls->dentry_name, repo->url);
1473                 aborted = 1;
1474                 free(ref);
1475                 return;
1476         }
1477
1478         o = parse_object(ref->old_sha1);
1479         if (!o) {
1480                 fprintf(stderr,
1481                         "Unable to parse object %s for remote ref %s\n",
1482                         sha1_to_hex(ref->old_sha1), ls->dentry_name);
1483                 aborted = 1;
1484                 free(ref);
1485                 return;
1486         }
1487
1488         len = strlen(ls->dentry_name) + 42;
1489         ref_info = xcalloc(len + 1, 1);
1490         sprintf(ref_info, "%s   %s\n",
1491                 sha1_to_hex(ref->old_sha1), ls->dentry_name);
1492         fwrite_buffer(ref_info, 1, len, buf);
1493         free(ref_info);
1494
1495         if (o->type == OBJ_TAG) {
1496                 o = deref_tag(o, ls->dentry_name, 0);
1497                 if (o) {
1498                         len = strlen(ls->dentry_name) + 45;
1499                         ref_info = xcalloc(len + 1, 1);
1500                         sprintf(ref_info, "%s   %s^{}\n",
1501                                 sha1_to_hex(o->sha1), ls->dentry_name);
1502                         fwrite_buffer(ref_info, 1, len, buf);
1503                         free(ref_info);
1504                 }
1505         }
1506         free(ref);
1507 }
1508
1509 static void update_remote_info_refs(struct remote_lock *lock)
1510 {
1511         struct buffer buffer = { STRBUF_INIT, 0 };
1512         struct active_request_slot *slot;
1513         struct slot_results results;
1514         struct curl_slist *dav_headers;
1515
1516         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
1517                   add_remote_info_ref, &buffer.buf);
1518         if (!aborted) {
1519                 dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1520
1521                 slot = get_active_slot();
1522                 slot->results = &results;
1523                 curl_setup_http(slot->curl, lock->url, DAV_PUT,
1524                                 &buffer, fwrite_null);
1525                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1526
1527                 if (start_active_slot(slot)) {
1528                         run_active_slot(slot);
1529                         if (results.curl_result != CURLE_OK) {
1530                                 fprintf(stderr,
1531                                         "PUT error: curl result=%d, HTTP code=%ld\n",
1532                                         results.curl_result, results.http_code);
1533                         }
1534                 }
1535         }
1536         strbuf_release(&buffer.buf);
1537 }
1538
1539 static int remote_exists(const char *path)
1540 {
1541         char *url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1542         int ret;
1543
1544         sprintf(url, "%s%s", repo->url, path);
1545
1546         switch (http_get_strbuf(url, NULL, NULL, 0)) {
1547         case HTTP_OK:
1548                 ret = 1;
1549                 break;
1550         case HTTP_MISSING_TARGET:
1551                 ret = 0;
1552                 break;
1553         case HTTP_ERROR:
1554                 http_error(url, HTTP_ERROR);
1555         default:
1556                 ret = -1;
1557         }
1558         free(url);
1559         return ret;
1560 }
1561
1562 static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
1563 {
1564         char *url;
1565         struct strbuf buffer = STRBUF_INIT;
1566
1567         url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1568         sprintf(url, "%s%s", repo->url, path);
1569
1570         if (http_get_strbuf(url, NULL, &buffer, 0) != HTTP_OK)
1571                 die("Couldn't get %s for remote symref\n%s", url,
1572                     curl_errorstr);
1573         free(url);
1574
1575         free(*symref);
1576         *symref = NULL;
1577         hashclr(sha1);
1578
1579         if (buffer.len == 0)
1580                 return;
1581
1582         /* If it's a symref, set the refname; otherwise try for a sha1 */
1583         if (!prefixcmp((char *)buffer.buf, "ref: ")) {
1584                 *symref = xmemdupz((char *)buffer.buf + 5, buffer.len - 6);
1585         } else {
1586                 get_sha1_hex(buffer.buf, sha1);
1587         }
1588
1589         strbuf_release(&buffer);
1590 }
1591
1592 static int verify_merge_base(unsigned char *head_sha1, struct ref *remote)
1593 {
1594         struct commit *head = lookup_commit_or_die(head_sha1, "HEAD");
1595         struct commit *branch = lookup_commit_or_die(remote->old_sha1, remote->name);
1596
1597         return in_merge_bases(branch, head);
1598 }
1599
1600 static int delete_remote_branch(const char *pattern, int force)
1601 {
1602         struct ref *refs = remote_refs;
1603         struct ref *remote_ref = NULL;
1604         unsigned char head_sha1[20];
1605         char *symref = NULL;
1606         int match;
1607         int patlen = strlen(pattern);
1608         int i;
1609         struct active_request_slot *slot;
1610         struct slot_results results;
1611         char *url;
1612
1613         /* Find the remote branch(es) matching the specified branch name */
1614         for (match = 0; refs; refs = refs->next) {
1615                 char *name = refs->name;
1616                 int namelen = strlen(name);
1617                 if (namelen < patlen ||
1618                     memcmp(name + namelen - patlen, pattern, patlen))
1619                         continue;
1620                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
1621                         continue;
1622                 match++;
1623                 remote_ref = refs;
1624         }
1625         if (match == 0)
1626                 return error("No remote branch matches %s", pattern);
1627         if (match != 1)
1628                 return error("More than one remote branch matches %s",
1629                              pattern);
1630
1631         /*
1632          * Remote HEAD must be a symref (not exactly foolproof; a remote
1633          * symlink to a symref will look like a symref)
1634          */
1635         fetch_symref("HEAD", &symref, head_sha1);
1636         if (!symref)
1637                 return error("Remote HEAD is not a symref");
1638
1639         /* Remote branch must not be the remote HEAD */
1640         for (i = 0; symref && i < MAXDEPTH; i++) {
1641                 if (!strcmp(remote_ref->name, symref))
1642                         return error("Remote branch %s is the current HEAD",
1643                                      remote_ref->name);
1644                 fetch_symref(symref, &symref, head_sha1);
1645         }
1646
1647         /* Run extra sanity checks if delete is not forced */
1648         if (!force) {
1649                 /* Remote HEAD must resolve to a known object */
1650                 if (symref)
1651                         return error("Remote HEAD symrefs too deep");
1652                 if (is_null_sha1(head_sha1))
1653                         return error("Unable to resolve remote HEAD");
1654                 if (!has_sha1_file(head_sha1))
1655                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
1656
1657                 /* Remote branch must resolve to a known object */
1658                 if (is_null_sha1(remote_ref->old_sha1))
1659                         return error("Unable to resolve remote branch %s",
1660                                      remote_ref->name);
1661                 if (!has_sha1_file(remote_ref->old_sha1))
1662                         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));
1663
1664                 /* Remote branch must be an ancestor of remote HEAD */
1665                 if (!verify_merge_base(head_sha1, remote_ref)) {
1666                         return error("The branch '%s' is not an ancestor "
1667                                      "of your current HEAD.\n"
1668                                      "If you are sure you want to delete it,"
1669                                      " run:\n\t'git http-push -D %s %s'",
1670                                      remote_ref->name, repo->url, pattern);
1671                 }
1672         }
1673
1674         /* Send delete request */
1675         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
1676         if (dry_run)
1677                 return 0;
1678         url = xmalloc(strlen(repo->url) + strlen(remote_ref->name) + 1);
1679         sprintf(url, "%s%s", repo->url, remote_ref->name);
1680         slot = get_active_slot();
1681         slot->results = &results;
1682         curl_setup_http_get(slot->curl, url, DAV_DELETE);
1683         if (start_active_slot(slot)) {
1684                 run_active_slot(slot);
1685                 free(url);
1686                 if (results.curl_result != CURLE_OK)
1687                         return error("DELETE request failed (%d/%ld)",
1688                                      results.curl_result, results.http_code);
1689         } else {
1690                 free(url);
1691                 return error("Unable to start DELETE request");
1692         }
1693
1694         return 0;
1695 }
1696
1697 static void run_request_queue(void)
1698 {
1699 #ifdef USE_CURL_MULTI
1700         is_running_queue = 1;
1701         fill_active_slots();
1702         add_fill_function(NULL, fill_active_slot);
1703 #endif
1704         do {
1705                 finish_all_active_slots();
1706 #ifdef USE_CURL_MULTI
1707                 fill_active_slots();
1708 #endif
1709         } while (request_queue_head && !aborted);
1710
1711 #ifdef USE_CURL_MULTI
1712         is_running_queue = 0;
1713 #endif
1714 }
1715
1716 int main(int argc, char **argv)
1717 {
1718         struct transfer_request *request;
1719         struct transfer_request *next_request;
1720         int nr_refspec = 0;
1721         char **refspec = NULL;
1722         struct remote_lock *ref_lock = NULL;
1723         struct remote_lock *info_ref_lock = NULL;
1724         struct rev_info revs;
1725         int delete_branch = 0;
1726         int force_delete = 0;
1727         int objects_to_send;
1728         int rc = 0;
1729         int i;
1730         int new_refs;
1731         struct ref *ref, *local_refs;
1732
1733         git_setup_gettext();
1734
1735         git_extract_argv0_path(argv[0]);
1736
1737         repo = xcalloc(sizeof(*repo), 1);
1738
1739         argv++;
1740         for (i = 1; i < argc; i++, argv++) {
1741                 char *arg = *argv;
1742
1743                 if (*arg == '-') {
1744                         if (!strcmp(arg, "--all")) {
1745                                 push_all = MATCH_REFS_ALL;
1746                                 continue;
1747                         }
1748                         if (!strcmp(arg, "--force")) {
1749                                 force_all = 1;
1750                                 continue;
1751                         }
1752                         if (!strcmp(arg, "--dry-run")) {
1753                                 dry_run = 1;
1754                                 continue;
1755                         }
1756                         if (!strcmp(arg, "--helper-status")) {
1757                                 helper_status = 1;
1758                                 continue;
1759                         }
1760                         if (!strcmp(arg, "--verbose")) {
1761                                 push_verbosely = 1;
1762                                 http_is_verbose = 1;
1763                                 continue;
1764                         }
1765                         if (!strcmp(arg, "-d")) {
1766                                 delete_branch = 1;
1767                                 continue;
1768                         }
1769                         if (!strcmp(arg, "-D")) {
1770                                 delete_branch = 1;
1771                                 force_delete = 1;
1772                                 continue;
1773                         }
1774                         if (!strcmp(arg, "-h"))
1775                                 usage(http_push_usage);
1776                 }
1777                 if (!repo->url) {
1778                         char *path = strstr(arg, "//");
1779                         str_end_url_with_slash(arg, &repo->url);
1780                         repo->path_len = strlen(repo->url);
1781                         if (path) {
1782                                 repo->path = strchr(path+2, '/');
1783                                 if (repo->path)
1784                                         repo->path_len = strlen(repo->path);
1785                         }
1786                         continue;
1787                 }
1788                 refspec = argv;
1789                 nr_refspec = argc - i;
1790                 break;
1791         }
1792
1793 #ifndef USE_CURL_MULTI
1794         die("git-push is not available for http/https repository when not compiled with USE_CURL_MULTI");
1795 #endif
1796
1797         if (!repo->url)
1798                 usage(http_push_usage);
1799
1800         if (delete_branch && nr_refspec != 1)
1801                 die("You must specify only one branch name when deleting a remote branch");
1802
1803         setup_git_directory();
1804
1805         memset(remote_dir_exists, -1, 256);
1806
1807         http_init(NULL, repo->url, 1);
1808
1809 #ifdef USE_CURL_MULTI
1810         is_running_queue = 0;
1811 #endif
1812
1813         /* Verify DAV compliance/lock support */
1814         if (!locking_available()) {
1815                 rc = 1;
1816                 goto cleanup;
1817         }
1818
1819         sigchain_push_common(remove_locks_on_signal);
1820
1821         /* Check whether the remote has server info files */
1822         repo->can_update_info_refs = 0;
1823         repo->has_info_refs = remote_exists("info/refs");
1824         repo->has_info_packs = remote_exists("objects/info/packs");
1825         if (repo->has_info_refs) {
1826                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
1827                 if (info_ref_lock)
1828                         repo->can_update_info_refs = 1;
1829                 else {
1830                         error("cannot lock existing info/refs");
1831                         rc = 1;
1832                         goto cleanup;
1833                 }
1834         }
1835         if (repo->has_info_packs)
1836                 fetch_indices();
1837
1838         /* Get a list of all local and remote heads to validate refspecs */
1839         local_refs = get_local_heads();
1840         fprintf(stderr, "Fetching remote heads...\n");
1841         get_dav_remote_heads();
1842         run_request_queue();
1843
1844         /* Remove a remote branch if -d or -D was specified */
1845         if (delete_branch) {
1846                 if (delete_remote_branch(refspec[0], force_delete) == -1) {
1847                         fprintf(stderr, "Unable to delete remote branch %s\n",
1848                                 refspec[0]);
1849                         if (helper_status)
1850                                 printf("error %s cannot remove\n", refspec[0]);
1851                 }
1852                 goto cleanup;
1853         }
1854
1855         /* match them up */
1856         if (match_push_refs(local_refs, &remote_refs,
1857                             nr_refspec, (const char **) refspec, push_all)) {
1858                 rc = -1;
1859                 goto cleanup;
1860         }
1861         if (!remote_refs) {
1862                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
1863                 if (helper_status)
1864                         printf("error null no match\n");
1865                 rc = 0;
1866                 goto cleanup;
1867         }
1868
1869         new_refs = 0;
1870         for (ref = remote_refs; ref; ref = ref->next) {
1871                 char old_hex[60], *new_hex;
1872                 const char *commit_argv[5];
1873                 int commit_argc;
1874                 char *new_sha1_hex, *old_sha1_hex;
1875
1876                 if (!ref->peer_ref)
1877                         continue;
1878
1879                 if (is_null_sha1(ref->peer_ref->new_sha1)) {
1880                         if (delete_remote_branch(ref->name, 1) == -1) {
1881                                 error("Could not remove %s", ref->name);
1882                                 if (helper_status)
1883                                         printf("error %s cannot remove\n", ref->name);
1884                                 rc = -4;
1885                         }
1886                         else if (helper_status)
1887                                 printf("ok %s\n", ref->name);
1888                         new_refs++;
1889                         continue;
1890                 }
1891
1892                 if (!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
1893                         if (push_verbosely)
1894                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
1895                         if (helper_status)
1896                                 printf("ok %s up to date\n", ref->name);
1897                         continue;
1898                 }
1899
1900                 if (!force_all &&
1901                     !is_null_sha1(ref->old_sha1) &&
1902                     !ref->force) {
1903                         if (!has_sha1_file(ref->old_sha1) ||
1904                             !ref_newer(ref->peer_ref->new_sha1,
1905                                        ref->old_sha1)) {
1906                                 /*
1907                                  * We do not have the remote ref, or
1908                                  * we know that the remote ref is not
1909                                  * an ancestor of what we are trying to
1910                                  * push.  Either way this can be losing
1911                                  * commits at the remote end and likely
1912                                  * we were not up to date to begin with.
1913                                  */
1914                                 error("remote '%s' is not an ancestor of\n"
1915                                       "local '%s'.\n"
1916                                       "Maybe you are not up-to-date and "
1917                                       "need to pull first?",
1918                                       ref->name,
1919                                       ref->peer_ref->name);
1920                                 if (helper_status)
1921                                         printf("error %s non-fast forward\n", ref->name);
1922                                 rc = -2;
1923                                 continue;
1924                         }
1925                 }
1926                 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1927                 new_refs++;
1928                 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
1929                 new_hex = sha1_to_hex(ref->new_sha1);
1930
1931                 fprintf(stderr, "updating '%s'", ref->name);
1932                 if (strcmp(ref->name, ref->peer_ref->name))
1933                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
1934                 fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
1935                 if (dry_run) {
1936                         if (helper_status)
1937                                 printf("ok %s\n", ref->name);
1938                         continue;
1939                 }
1940
1941                 /* Lock remote branch ref */
1942                 ref_lock = lock_remote(ref->name, LOCK_TIME);
1943                 if (ref_lock == NULL) {
1944                         fprintf(stderr, "Unable to lock remote branch %s\n",
1945                                 ref->name);
1946                         if (helper_status)
1947                                 printf("error %s lock error\n", ref->name);
1948                         rc = 1;
1949                         continue;
1950                 }
1951
1952                 /* Set up revision info for this refspec */
1953                 commit_argc = 3;
1954                 new_sha1_hex = xstrdup(sha1_to_hex(ref->new_sha1));
1955                 old_sha1_hex = NULL;
1956                 commit_argv[1] = "--objects";
1957                 commit_argv[2] = new_sha1_hex;
1958                 if (!push_all && !is_null_sha1(ref->old_sha1)) {
1959                         old_sha1_hex = xmalloc(42);
1960                         sprintf(old_sha1_hex, "^%s",
1961                                 sha1_to_hex(ref->old_sha1));
1962                         commit_argv[3] = old_sha1_hex;
1963                         commit_argc++;
1964                 }
1965                 commit_argv[commit_argc] = NULL;
1966                 init_revisions(&revs, setup_git_directory());
1967                 setup_revisions(commit_argc, commit_argv, &revs, NULL);
1968                 revs.edge_hint = 0; /* just in case */
1969                 free(new_sha1_hex);
1970                 if (old_sha1_hex) {
1971                         free(old_sha1_hex);
1972                         commit_argv[1] = NULL;
1973                 }
1974
1975                 /* Generate a list of objects that need to be pushed */
1976                 pushing = 0;
1977                 if (prepare_revision_walk(&revs))
1978                         die("revision walk setup failed");
1979                 mark_edges_uninteresting(revs.commits, &revs, NULL);
1980                 objects_to_send = get_delta(&revs, ref_lock);
1981                 finish_all_active_slots();
1982
1983                 /* Push missing objects to remote, this would be a
1984                    convenient time to pack them first if appropriate. */
1985                 pushing = 1;
1986                 if (objects_to_send)
1987                         fprintf(stderr, "    sending %d objects\n",
1988                                 objects_to_send);
1989
1990                 run_request_queue();
1991
1992                 /* Update the remote branch if all went well */
1993                 if (aborted || !update_remote(ref->new_sha1, ref_lock))
1994                         rc = 1;
1995
1996                 if (!rc)
1997                         fprintf(stderr, "    done\n");
1998                 if (helper_status)
1999                         printf("%s %s\n", !rc ? "ok" : "error", ref->name);
2000                 unlock_remote(ref_lock);
2001                 check_locks();
2002         }
2003
2004         /* Update remote server info if appropriate */
2005         if (repo->has_info_refs && new_refs) {
2006                 if (info_ref_lock && repo->can_update_info_refs) {
2007                         fprintf(stderr, "Updating remote server info\n");
2008                         if (!dry_run)
2009                                 update_remote_info_refs(info_ref_lock);
2010                 } else {
2011                         fprintf(stderr, "Unable to update server info\n");
2012                 }
2013         }
2014
2015  cleanup:
2016         if (info_ref_lock)
2017                 unlock_remote(info_ref_lock);
2018         free(repo);
2019
2020         http_cleanup();
2021
2022         request = request_queue_head;
2023         while (request != NULL) {
2024                 next_request = request->next;
2025                 release_request(request);
2026                 request = next_request;
2027         }
2028
2029         return rc;
2030 }