GIT 1.6.5.1
[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 #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
30 /* DAV methods */
31 #define DAV_LOCK "LOCK"
32 #define DAV_MKCOL "MKCOL"
33 #define DAV_MOVE "MOVE"
34 #define DAV_PROPFIND "PROPFIND"
35 #define DAV_PUT "PUT"
36 #define DAV_UNLOCK "UNLOCK"
37 #define DAV_DELETE "DELETE"
38
39 /* DAV lock flags */
40 #define DAV_PROP_LOCKWR (1u << 0)
41 #define DAV_PROP_LOCKEX (1u << 1)
42 #define DAV_LOCK_OK (1u << 2)
43
44 /* DAV XML properties */
45 #define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
46 #define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
47 #define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
48 #define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
49 #define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
50 #define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
51 #define DAV_PROPFIND_RESP ".multistatus.response"
52 #define DAV_PROPFIND_NAME ".multistatus.response.href"
53 #define DAV_PROPFIND_COLLECTION ".multistatus.response.propstat.prop.resourcetype.collection"
54
55 /* DAV request body templates */
56 #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>"
57 #define PROPFIND_ALL_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/>\n</D:propfind>"
58 #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>"
59
60 #define LOCK_TIME 600
61 #define LOCK_REFRESH 30
62
63 /* bits #0-15 in revision.h */
64
65 #define LOCAL    (1u<<16)
66 #define REMOTE   (1u<<17)
67 #define FETCHING (1u<<18)
68 #define PUSHING  (1u<<19)
69
70 /* We allow "recursive" symbolic refs. Only within reason, though */
71 #define MAXDEPTH 5
72
73 static int pushing;
74 static int aborted;
75 static signed char remote_dir_exists[256];
76
77 static int push_verbosely;
78 static int push_all = MATCH_REFS_NONE;
79 static int force_all;
80 static int dry_run;
81
82 static struct object_list *objects;
83
84 struct repo
85 {
86         char *url;
87         char *path;
88         int path_len;
89         int has_info_refs;
90         int can_update_info_refs;
91         int has_info_packs;
92         struct packed_git *packs;
93         struct remote_lock *locks;
94 };
95
96 static struct repo *repo;
97
98 enum transfer_state {
99         NEED_FETCH,
100         RUN_FETCH_LOOSE,
101         RUN_FETCH_PACKED,
102         NEED_PUSH,
103         RUN_MKCOL,
104         RUN_PUT,
105         RUN_MOVE,
106         ABORTED,
107         COMPLETE,
108 };
109
110 struct transfer_request
111 {
112         struct object *obj;
113         char *url;
114         char *dest;
115         struct remote_lock *lock;
116         struct curl_slist *headers;
117         struct buffer buffer;
118         enum transfer_state state;
119         CURLcode curl_result;
120         char errorstr[CURL_ERROR_SIZE];
121         long http_code;
122         void *userData;
123         struct active_request_slot *slot;
124         struct transfer_request *next;
125 };
126
127 static struct transfer_request *request_queue_head;
128
129 struct xml_ctx
130 {
131         char *name;
132         int len;
133         char *cdata;
134         void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
135         void *userData;
136 };
137
138 struct remote_lock
139 {
140         char *url;
141         char *owner;
142         char *token;
143         char tmpfile_suffix[41];
144         time_t start_time;
145         long timeout;
146         int refreshing;
147         struct remote_lock *next;
148 };
149
150 /* Flags that control remote_ls processing */
151 #define PROCESS_FILES (1u << 0)
152 #define PROCESS_DIRS  (1u << 1)
153 #define RECURSIVE     (1u << 2)
154
155 /* Flags that remote_ls passes to callback functions */
156 #define IS_DIR (1u << 0)
157
158 struct remote_ls_ctx
159 {
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(char *s)
177 {
178         struct strbuf buf = STRBUF_INIT;
179         while (*s) {
180                 size_t len = strcspn(s, "\"<>&");
181                 strbuf_add(&buf, s, len);
182                 s += len;
183                 switch (*s) {
184                 case '"':
185                         strbuf_addstr(&buf, "&quot;");
186                         break;
187                 case '<':
188                         strbuf_addstr(&buf, "&lt;");
189                         break;
190                 case '>':
191                         strbuf_addstr(&buf, "&gt;");
192                         break;
193                 case '&':
194                         strbuf_addstr(&buf, "&amp;");
195                         break;
196                 case 0:
197                         return strbuf_detach(&buf, NULL);
198                 }
199                 s++;
200         }
201         return strbuf_detach(&buf, NULL);
202 }
203
204 static struct curl_slist *get_dav_token_headers(struct remote_lock *lock, enum dav_header_flag options)
205 {
206         struct strbuf buf = STRBUF_INIT;
207         struct curl_slist *dav_headers = NULL;
208
209         if (options & DAV_HEADER_IF) {
210                 strbuf_addf(&buf, "If: (<%s>)", lock->token);
211                 dav_headers = curl_slist_append(dav_headers, buf.buf);
212                 strbuf_reset(&buf);
213         }
214         if (options & DAV_HEADER_LOCK) {
215                 strbuf_addf(&buf, "Lock-Token: <%s>", lock->token);
216                 dav_headers = curl_slist_append(dav_headers, buf.buf);
217                 strbuf_reset(&buf);
218         }
219         if (options & DAV_HEADER_TIMEOUT) {
220                 strbuf_addf(&buf, "Timeout: Second-%ld", lock->timeout);
221                 dav_headers = curl_slist_append(dav_headers, buf.buf);
222                 strbuf_reset(&buf);
223         }
224         strbuf_release(&buf);
225
226         return dav_headers;
227 }
228
229 static void finish_request(struct transfer_request *request);
230 static void release_request(struct transfer_request *request);
231
232 static void process_response(void *callback_data)
233 {
234         struct transfer_request *request =
235                 (struct transfer_request *)callback_data;
236
237         finish_request(request);
238 }
239
240 #ifdef USE_CURL_MULTI
241
242 static void start_fetch_loose(struct transfer_request *request)
243 {
244         struct active_request_slot *slot;
245         struct http_object_request *obj_req;
246
247         obj_req = new_http_object_request(repo->url, request->obj->sha1);
248         if (obj_req == NULL) {
249                 request->state = ABORTED;
250                 return;
251         }
252
253         slot = obj_req->slot;
254         slot->callback_func = process_response;
255         slot->callback_data = request;
256         request->slot = slot;
257         request->userData = obj_req;
258
259         /* Try to get the request started, abort the request on error */
260         request->state = RUN_FETCH_LOOSE;
261         if (!start_active_slot(slot)) {
262                 fprintf(stderr, "Unable to start GET request\n");
263                 repo->can_update_info_refs = 0;
264                 release_http_object_request(obj_req);
265                 release_request(request);
266         }
267 }
268
269 static void start_mkcol(struct transfer_request *request)
270 {
271         char *hex = sha1_to_hex(request->obj->sha1);
272         struct active_request_slot *slot;
273
274         request->url = get_remote_object_url(repo->url, hex, 1);
275
276         slot = get_active_slot();
277         slot->callback_func = process_response;
278         slot->callback_data = request;
279         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
280         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
281         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
282         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
283         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
284
285         if (start_active_slot(slot)) {
286                 request->slot = slot;
287                 request->state = RUN_MKCOL;
288         } else {
289                 request->state = ABORTED;
290                 free(request->url);
291                 request->url = NULL;
292         }
293 }
294 #endif
295
296 static void start_fetch_packed(struct transfer_request *request)
297 {
298         struct packed_git *target;
299
300         struct transfer_request *check_request = request_queue_head;
301         struct http_pack_request *preq;
302
303         target = find_sha1_pack(request->obj->sha1, repo->packs);
304         if (!target) {
305                 fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", sha1_to_hex(request->obj->sha1));
306                 repo->can_update_info_refs = 0;
307                 release_request(request);
308                 return;
309         }
310
311         fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
312         fprintf(stderr, " which contains %s\n", sha1_to_hex(request->obj->sha1));
313
314         preq = new_http_pack_request(target, repo->url);
315         if (preq == NULL) {
316                 release_http_pack_request(preq);
317                 repo->can_update_info_refs = 0;
318                 return;
319         }
320         preq->lst = &repo->packs;
321
322         /* Make sure there isn't another open request for this pack */
323         while (check_request) {
324                 if (check_request->state == RUN_FETCH_PACKED &&
325                     !strcmp(check_request->url, preq->url)) {
326                         release_http_pack_request(preq);
327                         release_request(request);
328                         return;
329                 }
330                 check_request = check_request->next;
331         }
332
333         preq->slot->callback_func = process_response;
334         preq->slot->callback_data = request;
335         request->slot = preq->slot;
336         request->userData = preq;
337
338         /* Try to get the request started, abort the request on error */
339         request->state = RUN_FETCH_PACKED;
340         if (!start_active_slot(preq->slot)) {
341                 fprintf(stderr, "Unable to start GET request\n");
342                 release_http_pack_request(preq);
343                 repo->can_update_info_refs = 0;
344                 release_request(request);
345         }
346 }
347
348 static void start_put(struct transfer_request *request)
349 {
350         char *hex = sha1_to_hex(request->obj->sha1);
351         struct active_request_slot *slot;
352         struct strbuf buf = STRBUF_INIT;
353         enum object_type type;
354         char hdr[50];
355         void *unpacked;
356         unsigned long len;
357         int hdrlen;
358         ssize_t size;
359         z_stream stream;
360
361         unpacked = read_sha1_file(request->obj->sha1, &type, &len);
362         hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1;
363
364         /* Set it up */
365         memset(&stream, 0, sizeof(stream));
366         deflateInit(&stream, zlib_compression_level);
367         size = deflateBound(&stream, len + hdrlen);
368         strbuf_init(&request->buffer.buf, size);
369         request->buffer.posn = 0;
370
371         /* Compress it */
372         stream.next_out = (unsigned char *)request->buffer.buf.buf;
373         stream.avail_out = size;
374
375         /* First header.. */
376         stream.next_in = (void *)hdr;
377         stream.avail_in = hdrlen;
378         while (deflate(&stream, 0) == Z_OK)
379                 /* nothing */;
380
381         /* Then the data itself.. */
382         stream.next_in = unpacked;
383         stream.avail_in = len;
384         while (deflate(&stream, Z_FINISH) == Z_OK)
385                 /* nothing */;
386         deflateEnd(&stream);
387         free(unpacked);
388
389         request->buffer.buf.len = stream.total_out;
390
391         strbuf_addstr(&buf, "Destination: ");
392         append_remote_object_url(&buf, repo->url, hex, 0);
393         request->dest = strbuf_detach(&buf, NULL);
394
395         append_remote_object_url(&buf, repo->url, hex, 0);
396         strbuf_add(&buf, request->lock->tmpfile_suffix, 41);
397         request->url = strbuf_detach(&buf, NULL);
398
399         slot = get_active_slot();
400         slot->callback_func = process_response;
401         slot->callback_data = request;
402         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &request->buffer);
403         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, request->buffer.buf.len);
404         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
405 #ifndef NO_CURL_IOCTL
406         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
407         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &request->buffer);
408 #endif
409         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
410         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
411         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
412         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
413         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
414         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
415
416         if (start_active_slot(slot)) {
417                 request->slot = slot;
418                 request->state = RUN_PUT;
419         } else {
420                 request->state = ABORTED;
421                 free(request->url);
422                 request->url = NULL;
423         }
424 }
425
426 static void start_move(struct transfer_request *request)
427 {
428         struct active_request_slot *slot;
429         struct curl_slist *dav_headers = NULL;
430
431         slot = get_active_slot();
432         slot->callback_func = process_response;
433         slot->callback_data = request;
434         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
435         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MOVE);
436         dav_headers = curl_slist_append(dav_headers, request->dest);
437         dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
438         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
439         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
440         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
441
442         if (start_active_slot(slot)) {
443                 request->slot = slot;
444                 request->state = RUN_MOVE;
445         } else {
446                 request->state = ABORTED;
447                 free(request->url);
448                 request->url = NULL;
449         }
450 }
451
452 static int refresh_lock(struct remote_lock *lock)
453 {
454         struct active_request_slot *slot;
455         struct slot_results results;
456         struct curl_slist *dav_headers;
457         int rc = 0;
458
459         lock->refreshing = 1;
460
461         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF | DAV_HEADER_TIMEOUT);
462
463         slot = get_active_slot();
464         slot->results = &results;
465         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
466         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
467         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
468         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
469         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
470
471         if (start_active_slot(slot)) {
472                 run_active_slot(slot);
473                 if (results.curl_result != CURLE_OK) {
474                         fprintf(stderr, "LOCK HTTP error %ld\n",
475                                 results.http_code);
476                 } else {
477                         lock->start_time = time(NULL);
478                         rc = 1;
479                 }
480         }
481
482         lock->refreshing = 0;
483         curl_slist_free_all(dav_headers);
484
485         return rc;
486 }
487
488 static void check_locks(void)
489 {
490         struct remote_lock *lock = repo->locks;
491         time_t current_time = time(NULL);
492         int time_remaining;
493
494         while (lock) {
495                 time_remaining = lock->start_time + lock->timeout -
496                         current_time;
497                 if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
498                         if (!refresh_lock(lock)) {
499                                 fprintf(stderr,
500                                         "Unable to refresh lock for %s\n",
501                                         lock->url);
502                                 aborted = 1;
503                                 return;
504                         }
505                 }
506                 lock = lock->next;
507         }
508 }
509
510 static void release_request(struct transfer_request *request)
511 {
512         struct transfer_request *entry = request_queue_head;
513
514         if (request == request_queue_head) {
515                 request_queue_head = request->next;
516         } else {
517                 while (entry->next != NULL && entry->next != request)
518                         entry = entry->next;
519                 if (entry->next == request)
520                         entry->next = entry->next->next;
521         }
522
523         free(request->url);
524         free(request);
525 }
526
527 static void finish_request(struct transfer_request *request)
528 {
529         struct http_pack_request *preq;
530         struct http_object_request *obj_req;
531
532         request->curl_result = request->slot->curl_result;
533         request->http_code = request->slot->http_code;
534         request->slot = NULL;
535
536         /* Keep locks active */
537         check_locks();
538
539         if (request->headers != NULL)
540                 curl_slist_free_all(request->headers);
541
542         /* URL is reused for MOVE after PUT */
543         if (request->state != RUN_PUT) {
544                 free(request->url);
545                 request->url = NULL;
546         }
547
548         if (request->state == RUN_MKCOL) {
549                 if (request->curl_result == CURLE_OK ||
550                     request->http_code == 405) {
551                         remote_dir_exists[request->obj->sha1[0]] = 1;
552                         start_put(request);
553                 } else {
554                         fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
555                                 sha1_to_hex(request->obj->sha1),
556                                 request->curl_result, request->http_code);
557                         request->state = ABORTED;
558                         aborted = 1;
559                 }
560         } else if (request->state == RUN_PUT) {
561                 if (request->curl_result == CURLE_OK) {
562                         start_move(request);
563                 } else {
564                         fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
565                                 sha1_to_hex(request->obj->sha1),
566                                 request->curl_result, request->http_code);
567                         request->state = ABORTED;
568                         aborted = 1;
569                 }
570         } else if (request->state == RUN_MOVE) {
571                 if (request->curl_result == CURLE_OK) {
572                         if (push_verbosely)
573                                 fprintf(stderr, "    sent %s\n",
574                                         sha1_to_hex(request->obj->sha1));
575                         request->obj->flags |= REMOTE;
576                         release_request(request);
577                 } else {
578                         fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
579                                 sha1_to_hex(request->obj->sha1),
580                                 request->curl_result, request->http_code);
581                         request->state = ABORTED;
582                         aborted = 1;
583                 }
584         } else if (request->state == RUN_FETCH_LOOSE) {
585                 obj_req = (struct http_object_request *)request->userData;
586
587                 if (finish_http_object_request(obj_req) == 0)
588                         if (obj_req->rename == 0)
589                                 request->obj->flags |= (LOCAL | REMOTE);
590
591                 /* Try fetching packed if necessary */
592                 if (request->obj->flags & LOCAL) {
593                         release_http_object_request(obj_req);
594                         release_request(request);
595                 } else
596                         start_fetch_packed(request);
597
598         } else if (request->state == RUN_FETCH_PACKED) {
599                 int fail = 1;
600                 if (request->curl_result != CURLE_OK) {
601                         fprintf(stderr, "Unable to get pack file %s\n%s",
602                                 request->url, curl_errorstr);
603                 } else {
604                         preq = (struct http_pack_request *)request->userData;
605
606                         if (preq) {
607                                 if (finish_http_pack_request(preq) > 0)
608                                         fail = 0;
609                                 release_http_pack_request(preq);
610                         }
611                 }
612                 if (fail)
613                         repo->can_update_info_refs = 0;
614                 release_request(request);
615         }
616 }
617
618 #ifdef USE_CURL_MULTI
619 static int is_running_queue;
620 static int fill_active_slot(void *unused)
621 {
622         struct transfer_request *request;
623
624         if (aborted || !is_running_queue)
625                 return 0;
626
627         for (request = request_queue_head; request; request = request->next) {
628                 if (request->state == NEED_FETCH) {
629                         start_fetch_loose(request);
630                         return 1;
631                 } else if (pushing && request->state == NEED_PUSH) {
632                         if (remote_dir_exists[request->obj->sha1[0]] == 1) {
633                                 start_put(request);
634                         } else {
635                                 start_mkcol(request);
636                         }
637                         return 1;
638                 }
639         }
640         return 0;
641 }
642 #endif
643
644 static void get_remote_object_list(unsigned char parent);
645
646 static void add_fetch_request(struct object *obj)
647 {
648         struct transfer_request *request;
649
650         check_locks();
651
652         /*
653          * Don't fetch the object if it's known to exist locally
654          * or is already in the request queue
655          */
656         if (remote_dir_exists[obj->sha1[0]] == -1)
657                 get_remote_object_list(obj->sha1[0]);
658         if (obj->flags & (LOCAL | FETCHING))
659                 return;
660
661         obj->flags |= FETCHING;
662         request = xmalloc(sizeof(*request));
663         request->obj = obj;
664         request->url = NULL;
665         request->lock = NULL;
666         request->headers = NULL;
667         request->state = NEED_FETCH;
668         request->next = request_queue_head;
669         request_queue_head = request;
670
671 #ifdef USE_CURL_MULTI
672         fill_active_slots();
673         step_active_slots();
674 #endif
675 }
676
677 static int add_send_request(struct object *obj, struct remote_lock *lock)
678 {
679         struct transfer_request *request = request_queue_head;
680         struct packed_git *target;
681
682         /* Keep locks active */
683         check_locks();
684
685         /*
686          * Don't push the object if it's known to exist on the remote
687          * or is already in the request queue
688          */
689         if (remote_dir_exists[obj->sha1[0]] == -1)
690                 get_remote_object_list(obj->sha1[0]);
691         if (obj->flags & (REMOTE | PUSHING))
692                 return 0;
693         target = find_sha1_pack(obj->sha1, repo->packs);
694         if (target) {
695                 obj->flags |= REMOTE;
696                 return 0;
697         }
698
699         obj->flags |= PUSHING;
700         request = xmalloc(sizeof(*request));
701         request->obj = obj;
702         request->url = NULL;
703         request->lock = lock;
704         request->headers = NULL;
705         request->state = NEED_PUSH;
706         request->next = request_queue_head;
707         request_queue_head = request;
708
709 #ifdef USE_CURL_MULTI
710         fill_active_slots();
711         step_active_slots();
712 #endif
713
714         return 1;
715 }
716
717 static int fetch_indices(void)
718 {
719         int ret;
720
721         if (push_verbosely)
722                 fprintf(stderr, "Getting pack list\n");
723
724         switch (http_get_info_packs(repo->url, &repo->packs)) {
725         case HTTP_OK:
726         case HTTP_MISSING_TARGET:
727                 ret = 0;
728                 break;
729         default:
730                 ret = -1;
731         }
732
733         return ret;
734 }
735
736 static void one_remote_object(const char *hex)
737 {
738         unsigned char sha1[20];
739         struct object *obj;
740
741         if (get_sha1_hex(hex, sha1) != 0)
742                 return;
743
744         obj = lookup_object(sha1);
745         if (!obj)
746                 obj = parse_object(sha1);
747
748         /* Ignore remote objects that don't exist locally */
749         if (!obj)
750                 return;
751
752         obj->flags |= REMOTE;
753         if (!object_list_contains(objects, obj))
754                 object_list_insert(obj, &objects);
755 }
756
757 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
758 {
759         int *lock_flags = (int *)ctx->userData;
760
761         if (tag_closed) {
762                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
763                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
764                             (*lock_flags & DAV_PROP_LOCKWR)) {
765                                 *lock_flags |= DAV_LOCK_OK;
766                         }
767                         *lock_flags &= DAV_LOCK_OK;
768                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
769                         *lock_flags |= DAV_PROP_LOCKWR;
770                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
771                         *lock_flags |= DAV_PROP_LOCKEX;
772                 }
773         }
774 }
775
776 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
777 {
778         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
779         git_SHA_CTX sha_ctx;
780         unsigned char lock_token_sha1[20];
781
782         if (tag_closed && ctx->cdata) {
783                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
784                         lock->owner = xmalloc(strlen(ctx->cdata) + 1);
785                         strcpy(lock->owner, ctx->cdata);
786                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
787                         if (!prefixcmp(ctx->cdata, "Second-"))
788                                 lock->timeout =
789                                         strtol(ctx->cdata + 7, NULL, 10);
790                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
791                         lock->token = xmalloc(strlen(ctx->cdata) + 1);
792                         strcpy(lock->token, ctx->cdata);
793
794                         git_SHA1_Init(&sha_ctx);
795                         git_SHA1_Update(&sha_ctx, lock->token, strlen(lock->token));
796                         git_SHA1_Final(lock_token_sha1, &sha_ctx);
797
798                         lock->tmpfile_suffix[0] = '_';
799                         memcpy(lock->tmpfile_suffix + 1, sha1_to_hex(lock_token_sha1), 40);
800                 }
801         }
802 }
803
804 static void one_remote_ref(char *refname);
805
806 static void
807 xml_start_tag(void *userData, const char *name, const char **atts)
808 {
809         struct xml_ctx *ctx = (struct xml_ctx *)userData;
810         const char *c = strchr(name, ':');
811         int new_len;
812
813         if (c == NULL)
814                 c = name;
815         else
816                 c++;
817
818         new_len = strlen(ctx->name) + strlen(c) + 2;
819
820         if (new_len > ctx->len) {
821                 ctx->name = xrealloc(ctx->name, new_len);
822                 ctx->len = new_len;
823         }
824         strcat(ctx->name, ".");
825         strcat(ctx->name, c);
826
827         free(ctx->cdata);
828         ctx->cdata = NULL;
829
830         ctx->userFunc(ctx, 0);
831 }
832
833 static void
834 xml_end_tag(void *userData, const char *name)
835 {
836         struct xml_ctx *ctx = (struct xml_ctx *)userData;
837         const char *c = strchr(name, ':');
838         char *ep;
839
840         ctx->userFunc(ctx, 1);
841
842         if (c == NULL)
843                 c = name;
844         else
845                 c++;
846
847         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
848         *ep = 0;
849 }
850
851 static void
852 xml_cdata(void *userData, const XML_Char *s, int len)
853 {
854         struct xml_ctx *ctx = (struct xml_ctx *)userData;
855         free(ctx->cdata);
856         ctx->cdata = xmemdupz(s, len);
857 }
858
859 static struct remote_lock *lock_remote(const char *path, long timeout)
860 {
861         struct active_request_slot *slot;
862         struct slot_results results;
863         struct buffer out_buffer = { STRBUF_INIT, 0 };
864         struct strbuf in_buffer = STRBUF_INIT;
865         char *url;
866         char *ep;
867         char timeout_header[25];
868         struct remote_lock *lock = NULL;
869         struct curl_slist *dav_headers = NULL;
870         struct xml_ctx ctx;
871         char *escaped;
872
873         url = xmalloc(strlen(repo->url) + strlen(path) + 1);
874         sprintf(url, "%s%s", repo->url, path);
875
876         /* Make sure leading directories exist for the remote ref */
877         ep = strchr(url + strlen(repo->url) + 1, '/');
878         while (ep) {
879                 char saved_character = ep[1];
880                 ep[1] = '\0';
881                 slot = get_active_slot();
882                 slot->results = &results;
883                 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
884                 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
885                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
886                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
887                 if (start_active_slot(slot)) {
888                         run_active_slot(slot);
889                         if (results.curl_result != CURLE_OK &&
890                             results.http_code != 405) {
891                                 fprintf(stderr,
892                                         "Unable to create branch path %s\n",
893                                         url);
894                                 free(url);
895                                 return NULL;
896                         }
897                 } else {
898                         fprintf(stderr, "Unable to start MKCOL request\n");
899                         free(url);
900                         return NULL;
901                 }
902                 ep[1] = saved_character;
903                 ep = strchr(ep + 1, '/');
904         }
905
906         escaped = xml_entities(git_default_email);
907         strbuf_addf(&out_buffer.buf, LOCK_REQUEST, escaped);
908         free(escaped);
909
910         sprintf(timeout_header, "Timeout: Second-%ld", timeout);
911         dav_headers = curl_slist_append(dav_headers, timeout_header);
912         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
913
914         slot = get_active_slot();
915         slot->results = &results;
916         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
917         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
918         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
919 #ifndef NO_CURL_IOCTL
920         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
921         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
922 #endif
923         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
924         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
925         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
926         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
927         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
928         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
929
930         lock = xcalloc(1, sizeof(*lock));
931         lock->timeout = -1;
932
933         if (start_active_slot(slot)) {
934                 run_active_slot(slot);
935                 if (results.curl_result == CURLE_OK) {
936                         XML_Parser parser = XML_ParserCreate(NULL);
937                         enum XML_Status result;
938                         ctx.name = xcalloc(10, 1);
939                         ctx.len = 0;
940                         ctx.cdata = NULL;
941                         ctx.userFunc = handle_new_lock_ctx;
942                         ctx.userData = lock;
943                         XML_SetUserData(parser, &ctx);
944                         XML_SetElementHandler(parser, xml_start_tag,
945                                               xml_end_tag);
946                         XML_SetCharacterDataHandler(parser, xml_cdata);
947                         result = XML_Parse(parser, in_buffer.buf,
948                                            in_buffer.len, 1);
949                         free(ctx.name);
950                         if (result != XML_STATUS_OK) {
951                                 fprintf(stderr, "XML error: %s\n",
952                                         XML_ErrorString(
953                                                 XML_GetErrorCode(parser)));
954                                 lock->timeout = -1;
955                         }
956                         XML_ParserFree(parser);
957                 }
958         } else {
959                 fprintf(stderr, "Unable to start LOCK request\n");
960         }
961
962         curl_slist_free_all(dav_headers);
963         strbuf_release(&out_buffer.buf);
964         strbuf_release(&in_buffer);
965
966         if (lock->token == NULL || lock->timeout <= 0) {
967                 free(lock->token);
968                 free(lock->owner);
969                 free(url);
970                 free(lock);
971                 lock = NULL;
972         } else {
973                 lock->url = url;
974                 lock->start_time = time(NULL);
975                 lock->next = repo->locks;
976                 repo->locks = lock;
977         }
978
979         return lock;
980 }
981
982 static int unlock_remote(struct remote_lock *lock)
983 {
984         struct active_request_slot *slot;
985         struct slot_results results;
986         struct remote_lock *prev = repo->locks;
987         struct curl_slist *dav_headers;
988         int rc = 0;
989
990         dav_headers = get_dav_token_headers(lock, DAV_HEADER_LOCK);
991
992         slot = get_active_slot();
993         slot->results = &results;
994         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
995         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
996         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
997         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
998
999         if (start_active_slot(slot)) {
1000                 run_active_slot(slot);
1001                 if (results.curl_result == CURLE_OK)
1002                         rc = 1;
1003                 else
1004                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
1005                                 results.http_code);
1006         } else {
1007                 fprintf(stderr, "Unable to start UNLOCK request\n");
1008         }
1009
1010         curl_slist_free_all(dav_headers);
1011
1012         if (repo->locks == lock) {
1013                 repo->locks = lock->next;
1014         } else {
1015                 while (prev && prev->next != lock)
1016                         prev = prev->next;
1017                 if (prev)
1018                         prev->next = prev->next->next;
1019         }
1020
1021         free(lock->owner);
1022         free(lock->url);
1023         free(lock->token);
1024         free(lock);
1025
1026         return rc;
1027 }
1028
1029 static void remove_locks(void)
1030 {
1031         struct remote_lock *lock = repo->locks;
1032
1033         fprintf(stderr, "Removing remote locks...\n");
1034         while (lock) {
1035                 struct remote_lock *next = lock->next;
1036                 unlock_remote(lock);
1037                 lock = next;
1038         }
1039 }
1040
1041 static void remove_locks_on_signal(int signo)
1042 {
1043         remove_locks();
1044         sigchain_pop(signo);
1045         raise(signo);
1046 }
1047
1048 static void remote_ls(const char *path, int flags,
1049                       void (*userFunc)(struct remote_ls_ctx *ls),
1050                       void *userData);
1051
1052 static void process_ls_object(struct remote_ls_ctx *ls)
1053 {
1054         unsigned int *parent = (unsigned int *)ls->userData;
1055         char *path = ls->dentry_name;
1056         char *obj_hex;
1057
1058         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1059                 remote_dir_exists[*parent] = 1;
1060                 return;
1061         }
1062
1063         if (strlen(path) != 49)
1064                 return;
1065         path += 8;
1066         obj_hex = xmalloc(strlen(path));
1067         /* NB: path is not null-terminated, can not use strlcpy here */
1068         memcpy(obj_hex, path, 2);
1069         strcpy(obj_hex + 2, path + 3);
1070         one_remote_object(obj_hex);
1071         free(obj_hex);
1072 }
1073
1074 static void process_ls_ref(struct remote_ls_ctx *ls)
1075 {
1076         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1077                 fprintf(stderr, "  %s\n", ls->dentry_name);
1078                 return;
1079         }
1080
1081         if (!(ls->dentry_flags & IS_DIR))
1082                 one_remote_ref(ls->dentry_name);
1083 }
1084
1085 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1086 {
1087         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1088
1089         if (tag_closed) {
1090                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1091                         if (ls->dentry_flags & IS_DIR) {
1092                                 if (ls->flags & PROCESS_DIRS) {
1093                                         ls->userFunc(ls);
1094                                 }
1095                                 if (strcmp(ls->dentry_name, ls->path) &&
1096                                     ls->flags & RECURSIVE) {
1097                                         remote_ls(ls->dentry_name,
1098                                                   ls->flags,
1099                                                   ls->userFunc,
1100                                                   ls->userData);
1101                                 }
1102                         } else if (ls->flags & PROCESS_FILES) {
1103                                 ls->userFunc(ls);
1104                         }
1105                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1106                         char *path = ctx->cdata;
1107                         if (*ctx->cdata == 'h') {
1108                                 path = strstr(path, "//");
1109                                 if (path) {
1110                                         path = strchr(path+2, '/');
1111                                 }
1112                         }
1113                         if (path) {
1114                                 path += repo->path_len;
1115                                 ls->dentry_name = xstrdup(path);
1116                         }
1117                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1118                         ls->dentry_flags |= IS_DIR;
1119                 }
1120         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1121                 free(ls->dentry_name);
1122                 ls->dentry_name = NULL;
1123                 ls->dentry_flags = 0;
1124         }
1125 }
1126
1127 /*
1128  * NEEDSWORK: remote_ls() ignores info/refs on the remote side.  But it
1129  * should _only_ heed the information from that file, instead of trying to
1130  * determine the refs from the remote file system (badly: it does not even
1131  * know about packed-refs).
1132  */
1133 static void remote_ls(const char *path, int flags,
1134                       void (*userFunc)(struct remote_ls_ctx *ls),
1135                       void *userData)
1136 {
1137         char *url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1138         struct active_request_slot *slot;
1139         struct slot_results results;
1140         struct strbuf in_buffer = STRBUF_INIT;
1141         struct buffer out_buffer = { STRBUF_INIT, 0 };
1142         struct curl_slist *dav_headers = NULL;
1143         struct xml_ctx ctx;
1144         struct remote_ls_ctx ls;
1145
1146         ls.flags = flags;
1147         ls.path = xstrdup(path);
1148         ls.dentry_name = NULL;
1149         ls.dentry_flags = 0;
1150         ls.userData = userData;
1151         ls.userFunc = userFunc;
1152
1153         sprintf(url, "%s%s", repo->url, path);
1154
1155         strbuf_addf(&out_buffer.buf, PROPFIND_ALL_REQUEST);
1156
1157         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1158         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1159
1160         slot = get_active_slot();
1161         slot->results = &results;
1162         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1163         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1164         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1165 #ifndef NO_CURL_IOCTL
1166         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1167         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1168 #endif
1169         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1170         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1171         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1172         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1173         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1174         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1175
1176         if (start_active_slot(slot)) {
1177                 run_active_slot(slot);
1178                 if (results.curl_result == CURLE_OK) {
1179                         XML_Parser parser = XML_ParserCreate(NULL);
1180                         enum XML_Status result;
1181                         ctx.name = xcalloc(10, 1);
1182                         ctx.len = 0;
1183                         ctx.cdata = NULL;
1184                         ctx.userFunc = handle_remote_ls_ctx;
1185                         ctx.userData = &ls;
1186                         XML_SetUserData(parser, &ctx);
1187                         XML_SetElementHandler(parser, xml_start_tag,
1188                                               xml_end_tag);
1189                         XML_SetCharacterDataHandler(parser, xml_cdata);
1190                         result = XML_Parse(parser, in_buffer.buf,
1191                                            in_buffer.len, 1);
1192                         free(ctx.name);
1193
1194                         if (result != XML_STATUS_OK) {
1195                                 fprintf(stderr, "XML error: %s\n",
1196                                         XML_ErrorString(
1197                                                 XML_GetErrorCode(parser)));
1198                         }
1199                         XML_ParserFree(parser);
1200                 }
1201         } else {
1202                 fprintf(stderr, "Unable to start PROPFIND request\n");
1203         }
1204
1205         free(ls.path);
1206         free(url);
1207         strbuf_release(&out_buffer.buf);
1208         strbuf_release(&in_buffer);
1209         curl_slist_free_all(dav_headers);
1210 }
1211
1212 static void get_remote_object_list(unsigned char parent)
1213 {
1214         char path[] = "objects/XX/";
1215         static const char hex[] = "0123456789abcdef";
1216         unsigned int val = parent;
1217
1218         path[8] = hex[val >> 4];
1219         path[9] = hex[val & 0xf];
1220         remote_dir_exists[val] = 0;
1221         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1222                   process_ls_object, &val);
1223 }
1224
1225 static int locking_available(void)
1226 {
1227         struct active_request_slot *slot;
1228         struct slot_results results;
1229         struct strbuf in_buffer = STRBUF_INIT;
1230         struct buffer out_buffer = { STRBUF_INIT, 0 };
1231         struct curl_slist *dav_headers = NULL;
1232         struct xml_ctx ctx;
1233         int lock_flags = 0;
1234         char *escaped;
1235
1236         escaped = xml_entities(repo->url);
1237         strbuf_addf(&out_buffer.buf, PROPFIND_SUPPORTEDLOCK_REQUEST, escaped);
1238         free(escaped);
1239
1240         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1241         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1242
1243         slot = get_active_slot();
1244         slot->results = &results;
1245         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1246         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1247         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1248 #ifndef NO_CURL_IOCTL
1249         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1250         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1251 #endif
1252         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1253         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1254         curl_easy_setopt(slot->curl, CURLOPT_URL, repo->url);
1255         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1256         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1257         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1258
1259         if (start_active_slot(slot)) {
1260                 run_active_slot(slot);
1261                 if (results.curl_result == CURLE_OK) {
1262                         XML_Parser parser = XML_ParserCreate(NULL);
1263                         enum XML_Status result;
1264                         ctx.name = xcalloc(10, 1);
1265                         ctx.len = 0;
1266                         ctx.cdata = NULL;
1267                         ctx.userFunc = handle_lockprop_ctx;
1268                         ctx.userData = &lock_flags;
1269                         XML_SetUserData(parser, &ctx);
1270                         XML_SetElementHandler(parser, xml_start_tag,
1271                                               xml_end_tag);
1272                         result = XML_Parse(parser, in_buffer.buf,
1273                                            in_buffer.len, 1);
1274                         free(ctx.name);
1275
1276                         if (result != XML_STATUS_OK) {
1277                                 fprintf(stderr, "XML error: %s\n",
1278                                         XML_ErrorString(
1279                                                 XML_GetErrorCode(parser)));
1280                                 lock_flags = 0;
1281                         }
1282                         XML_ParserFree(parser);
1283                         if (!lock_flags)
1284                                 error("no DAV locking support on %s",
1285                                       repo->url);
1286
1287                 } else {
1288                         error("Cannot access URL %s, return code %d",
1289                               repo->url, results.curl_result);
1290                         lock_flags = 0;
1291                 }
1292         } else {
1293                 error("Unable to start PROPFIND request on %s", repo->url);
1294         }
1295
1296         strbuf_release(&out_buffer.buf);
1297         strbuf_release(&in_buffer);
1298         curl_slist_free_all(dav_headers);
1299
1300         return lock_flags;
1301 }
1302
1303 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1304 {
1305         struct object_list *entry = xmalloc(sizeof(struct object_list));
1306         entry->item = obj;
1307         entry->next = *p;
1308         *p = entry;
1309         return &entry->next;
1310 }
1311
1312 static struct object_list **process_blob(struct blob *blob,
1313                                          struct object_list **p,
1314                                          struct name_path *path,
1315                                          const char *name)
1316 {
1317         struct object *obj = &blob->object;
1318
1319         obj->flags |= LOCAL;
1320
1321         if (obj->flags & (UNINTERESTING | SEEN))
1322                 return p;
1323
1324         obj->flags |= SEEN;
1325         return add_one_object(obj, p);
1326 }
1327
1328 static struct object_list **process_tree(struct tree *tree,
1329                                          struct object_list **p,
1330                                          struct name_path *path,
1331                                          const char *name)
1332 {
1333         struct object *obj = &tree->object;
1334         struct tree_desc desc;
1335         struct name_entry entry;
1336         struct name_path me;
1337
1338         obj->flags |= LOCAL;
1339
1340         if (obj->flags & (UNINTERESTING | SEEN))
1341                 return p;
1342         if (parse_tree(tree) < 0)
1343                 die("bad tree object %s", sha1_to_hex(obj->sha1));
1344
1345         obj->flags |= SEEN;
1346         name = xstrdup(name);
1347         p = add_one_object(obj, p);
1348         me.up = path;
1349         me.elem = name;
1350         me.elem_len = strlen(name);
1351
1352         init_tree_desc(&desc, tree->buffer, tree->size);
1353
1354         while (tree_entry(&desc, &entry))
1355                 switch (object_type(entry.mode)) {
1356                 case OBJ_TREE:
1357                         p = process_tree(lookup_tree(entry.sha1), p, &me, name);
1358                         break;
1359                 case OBJ_BLOB:
1360                         p = process_blob(lookup_blob(entry.sha1), p, &me, name);
1361                         break;
1362                 default:
1363                         /* Subproject commit - not in this repository */
1364                         break;
1365                 }
1366
1367         free(tree->buffer);
1368         tree->buffer = NULL;
1369         return p;
1370 }
1371
1372 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1373 {
1374         int i;
1375         struct commit *commit;
1376         struct object_list **p = &objects;
1377         int count = 0;
1378
1379         while ((commit = get_revision(revs)) != NULL) {
1380                 p = process_tree(commit->tree, p, NULL, "");
1381                 commit->object.flags |= LOCAL;
1382                 if (!(commit->object.flags & UNINTERESTING))
1383                         count += add_send_request(&commit->object, lock);
1384         }
1385
1386         for (i = 0; i < revs->pending.nr; i++) {
1387                 struct object_array_entry *entry = revs->pending.objects + i;
1388                 struct object *obj = entry->item;
1389                 const char *name = entry->name;
1390
1391                 if (obj->flags & (UNINTERESTING | SEEN))
1392                         continue;
1393                 if (obj->type == OBJ_TAG) {
1394                         obj->flags |= SEEN;
1395                         p = add_one_object(obj, p);
1396                         continue;
1397                 }
1398                 if (obj->type == OBJ_TREE) {
1399                         p = process_tree((struct tree *)obj, p, NULL, name);
1400                         continue;
1401                 }
1402                 if (obj->type == OBJ_BLOB) {
1403                         p = process_blob((struct blob *)obj, p, NULL, name);
1404                         continue;
1405                 }
1406                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1407         }
1408
1409         while (objects) {
1410                 if (!(objects->item->flags & UNINTERESTING))
1411                         count += add_send_request(objects->item, lock);
1412                 objects = objects->next;
1413         }
1414
1415         return count;
1416 }
1417
1418 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1419 {
1420         struct active_request_slot *slot;
1421         struct slot_results results;
1422         struct buffer out_buffer = { STRBUF_INIT, 0 };
1423         struct curl_slist *dav_headers;
1424
1425         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1426
1427         strbuf_addf(&out_buffer.buf, "%s\n", sha1_to_hex(sha1));
1428
1429         slot = get_active_slot();
1430         slot->results = &results;
1431         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1432         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1433         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1434 #ifndef NO_CURL_IOCTL
1435         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1436         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1437 #endif
1438         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1439         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1440         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1441         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1442         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1443         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1444
1445         if (start_active_slot(slot)) {
1446                 run_active_slot(slot);
1447                 strbuf_release(&out_buffer.buf);
1448                 if (results.curl_result != CURLE_OK) {
1449                         fprintf(stderr,
1450                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1451                                 results.curl_result, results.http_code);
1452                         /* We should attempt recovery? */
1453                         return 0;
1454                 }
1455         } else {
1456                 strbuf_release(&out_buffer.buf);
1457                 fprintf(stderr, "Unable to start PUT request\n");
1458                 return 0;
1459         }
1460
1461         return 1;
1462 }
1463
1464 static struct ref *remote_refs;
1465
1466 static void one_remote_ref(char *refname)
1467 {
1468         struct ref *ref;
1469         struct object *obj;
1470
1471         ref = alloc_ref(refname);
1472
1473         if (http_fetch_ref(repo->url, ref) != 0) {
1474                 fprintf(stderr,
1475                         "Unable to fetch ref %s from %s\n",
1476                         refname, repo->url);
1477                 free(ref);
1478                 return;
1479         }
1480
1481         /*
1482          * Fetch a copy of the object if it doesn't exist locally - it
1483          * may be required for updating server info later.
1484          */
1485         if (repo->can_update_info_refs && !has_sha1_file(ref->old_sha1)) {
1486                 obj = lookup_unknown_object(ref->old_sha1);
1487                 if (obj) {
1488                         fprintf(stderr, "  fetch %s for %s\n",
1489                                 sha1_to_hex(ref->old_sha1), refname);
1490                         add_fetch_request(obj);
1491                 }
1492         }
1493
1494         ref->next = remote_refs;
1495         remote_refs = ref;
1496 }
1497
1498 static void get_dav_remote_heads(void)
1499 {
1500         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1501 }
1502
1503 static void add_remote_info_ref(struct remote_ls_ctx *ls)
1504 {
1505         struct strbuf *buf = (struct strbuf *)ls->userData;
1506         struct object *o;
1507         int len;
1508         char *ref_info;
1509         struct ref *ref;
1510
1511         ref = alloc_ref(ls->dentry_name);
1512
1513         if (http_fetch_ref(repo->url, ref) != 0) {
1514                 fprintf(stderr,
1515                         "Unable to fetch ref %s from %s\n",
1516                         ls->dentry_name, repo->url);
1517                 aborted = 1;
1518                 free(ref);
1519                 return;
1520         }
1521
1522         o = parse_object(ref->old_sha1);
1523         if (!o) {
1524                 fprintf(stderr,
1525                         "Unable to parse object %s for remote ref %s\n",
1526                         sha1_to_hex(ref->old_sha1), ls->dentry_name);
1527                 aborted = 1;
1528                 free(ref);
1529                 return;
1530         }
1531
1532         len = strlen(ls->dentry_name) + 42;
1533         ref_info = xcalloc(len + 1, 1);
1534         sprintf(ref_info, "%s   %s\n",
1535                 sha1_to_hex(ref->old_sha1), ls->dentry_name);
1536         fwrite_buffer(ref_info, 1, len, buf);
1537         free(ref_info);
1538
1539         if (o->type == OBJ_TAG) {
1540                 o = deref_tag(o, ls->dentry_name, 0);
1541                 if (o) {
1542                         len = strlen(ls->dentry_name) + 45;
1543                         ref_info = xcalloc(len + 1, 1);
1544                         sprintf(ref_info, "%s   %s^{}\n",
1545                                 sha1_to_hex(o->sha1), ls->dentry_name);
1546                         fwrite_buffer(ref_info, 1, len, buf);
1547                         free(ref_info);
1548                 }
1549         }
1550         free(ref);
1551 }
1552
1553 static void update_remote_info_refs(struct remote_lock *lock)
1554 {
1555         struct buffer buffer = { STRBUF_INIT, 0 };
1556         struct active_request_slot *slot;
1557         struct slot_results results;
1558         struct curl_slist *dav_headers;
1559
1560         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
1561                   add_remote_info_ref, &buffer.buf);
1562         if (!aborted) {
1563                 dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1564
1565                 slot = get_active_slot();
1566                 slot->results = &results;
1567                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, &buffer);
1568                 curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, buffer.buf.len);
1569                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1570 #ifndef NO_CURL_IOCTL
1571                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1572                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &buffer);
1573 #endif
1574                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1575                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1576                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1577                 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1578                 curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1579                 curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1580
1581                 if (start_active_slot(slot)) {
1582                         run_active_slot(slot);
1583                         if (results.curl_result != CURLE_OK) {
1584                                 fprintf(stderr,
1585                                         "PUT error: curl result=%d, HTTP code=%ld\n",
1586                                         results.curl_result, results.http_code);
1587                         }
1588                 }
1589         }
1590         strbuf_release(&buffer.buf);
1591 }
1592
1593 static int remote_exists(const char *path)
1594 {
1595         char *url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1596         int ret;
1597
1598         sprintf(url, "%s%s", repo->url, path);
1599
1600         switch (http_get_strbuf(url, NULL, 0)) {
1601         case HTTP_OK:
1602                 ret = 1;
1603                 break;
1604         case HTTP_MISSING_TARGET:
1605                 ret = 0;
1606                 break;
1607         case HTTP_ERROR:
1608                 http_error(url, HTTP_ERROR);
1609         default:
1610                 ret = -1;
1611         }
1612         free(url);
1613         return ret;
1614 }
1615
1616 static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
1617 {
1618         char *url;
1619         struct strbuf buffer = STRBUF_INIT;
1620
1621         url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1622         sprintf(url, "%s%s", repo->url, path);
1623
1624         if (http_get_strbuf(url, &buffer, 0) != HTTP_OK)
1625                 die("Couldn't get %s for remote symref\n%s", url,
1626                     curl_errorstr);
1627         free(url);
1628
1629         free(*symref);
1630         *symref = NULL;
1631         hashclr(sha1);
1632
1633         if (buffer.len == 0)
1634                 return;
1635
1636         /* If it's a symref, set the refname; otherwise try for a sha1 */
1637         if (!prefixcmp((char *)buffer.buf, "ref: ")) {
1638                 *symref = xmemdupz((char *)buffer.buf + 5, buffer.len - 6);
1639         } else {
1640                 get_sha1_hex(buffer.buf, sha1);
1641         }
1642
1643         strbuf_release(&buffer);
1644 }
1645
1646 static int verify_merge_base(unsigned char *head_sha1, unsigned char *branch_sha1)
1647 {
1648         struct commit *head = lookup_commit(head_sha1);
1649         struct commit *branch = lookup_commit(branch_sha1);
1650         struct commit_list *merge_bases = get_merge_bases(head, branch, 1);
1651
1652         return (merge_bases && !merge_bases->next && merge_bases->item == branch);
1653 }
1654
1655 static int delete_remote_branch(char *pattern, int force)
1656 {
1657         struct ref *refs = remote_refs;
1658         struct ref *remote_ref = NULL;
1659         unsigned char head_sha1[20];
1660         char *symref = NULL;
1661         int match;
1662         int patlen = strlen(pattern);
1663         int i;
1664         struct active_request_slot *slot;
1665         struct slot_results results;
1666         char *url;
1667
1668         /* Find the remote branch(es) matching the specified branch name */
1669         for (match = 0; refs; refs = refs->next) {
1670                 char *name = refs->name;
1671                 int namelen = strlen(name);
1672                 if (namelen < patlen ||
1673                     memcmp(name + namelen - patlen, pattern, patlen))
1674                         continue;
1675                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
1676                         continue;
1677                 match++;
1678                 remote_ref = refs;
1679         }
1680         if (match == 0)
1681                 return error("No remote branch matches %s", pattern);
1682         if (match != 1)
1683                 return error("More than one remote branch matches %s",
1684                              pattern);
1685
1686         /*
1687          * Remote HEAD must be a symref (not exactly foolproof; a remote
1688          * symlink to a symref will look like a symref)
1689          */
1690         fetch_symref("HEAD", &symref, head_sha1);
1691         if (!symref)
1692                 return error("Remote HEAD is not a symref");
1693
1694         /* Remote branch must not be the remote HEAD */
1695         for (i=0; symref && i<MAXDEPTH; i++) {
1696                 if (!strcmp(remote_ref->name, symref))
1697                         return error("Remote branch %s is the current HEAD",
1698                                      remote_ref->name);
1699                 fetch_symref(symref, &symref, head_sha1);
1700         }
1701
1702         /* Run extra sanity checks if delete is not forced */
1703         if (!force) {
1704                 /* Remote HEAD must resolve to a known object */
1705                 if (symref)
1706                         return error("Remote HEAD symrefs too deep");
1707                 if (is_null_sha1(head_sha1))
1708                         return error("Unable to resolve remote HEAD");
1709                 if (!has_sha1_file(head_sha1))
1710                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
1711
1712                 /* Remote branch must resolve to a known object */
1713                 if (is_null_sha1(remote_ref->old_sha1))
1714                         return error("Unable to resolve remote branch %s",
1715                                      remote_ref->name);
1716                 if (!has_sha1_file(remote_ref->old_sha1))
1717                         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));
1718
1719                 /* Remote branch must be an ancestor of remote HEAD */
1720                 if (!verify_merge_base(head_sha1, remote_ref->old_sha1)) {
1721                         return error("The branch '%s' is not an ancestor "
1722                                      "of your current HEAD.\n"
1723                                      "If you are sure you want to delete it,"
1724                                      " run:\n\t'git http-push -D %s %s'",
1725                                      remote_ref->name, repo->url, pattern);
1726                 }
1727         }
1728
1729         /* Send delete request */
1730         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
1731         if (dry_run)
1732                 return 0;
1733         url = xmalloc(strlen(repo->url) + strlen(remote_ref->name) + 1);
1734         sprintf(url, "%s%s", repo->url, remote_ref->name);
1735         slot = get_active_slot();
1736         slot->results = &results;
1737         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1738         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1739         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1740         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_DELETE);
1741         if (start_active_slot(slot)) {
1742                 run_active_slot(slot);
1743                 free(url);
1744                 if (results.curl_result != CURLE_OK)
1745                         return error("DELETE request failed (%d/%ld)\n",
1746                                      results.curl_result, results.http_code);
1747         } else {
1748                 free(url);
1749                 return error("Unable to start DELETE request");
1750         }
1751
1752         return 0;
1753 }
1754
1755 static void run_request_queue(void)
1756 {
1757 #ifdef USE_CURL_MULTI
1758         is_running_queue = 1;
1759         fill_active_slots();
1760         add_fill_function(NULL, fill_active_slot);
1761 #endif
1762         do {
1763                 finish_all_active_slots();
1764 #ifdef USE_CURL_MULTI
1765                 fill_active_slots();
1766 #endif
1767         } while (request_queue_head && !aborted);
1768
1769 #ifdef USE_CURL_MULTI
1770         is_running_queue = 0;
1771 #endif
1772 }
1773
1774 int main(int argc, char **argv)
1775 {
1776         struct transfer_request *request;
1777         struct transfer_request *next_request;
1778         int nr_refspec = 0;
1779         char **refspec = NULL;
1780         struct remote_lock *ref_lock = NULL;
1781         struct remote_lock *info_ref_lock = NULL;
1782         struct rev_info revs;
1783         int delete_branch = 0;
1784         int force_delete = 0;
1785         int objects_to_send;
1786         int rc = 0;
1787         int i;
1788         int new_refs;
1789         struct ref *ref, *local_refs;
1790         struct remote *remote;
1791         char *rewritten_url = NULL;
1792
1793         git_extract_argv0_path(argv[0]);
1794
1795         setup_git_directory();
1796
1797         repo = xcalloc(sizeof(*repo), 1);
1798
1799         argv++;
1800         for (i = 1; i < argc; i++, argv++) {
1801                 char *arg = *argv;
1802
1803                 if (*arg == '-') {
1804                         if (!strcmp(arg, "--all")) {
1805                                 push_all = MATCH_REFS_ALL;
1806                                 continue;
1807                         }
1808                         if (!strcmp(arg, "--force")) {
1809                                 force_all = 1;
1810                                 continue;
1811                         }
1812                         if (!strcmp(arg, "--dry-run")) {
1813                                 dry_run = 1;
1814                                 continue;
1815                         }
1816                         if (!strcmp(arg, "--verbose")) {
1817                                 push_verbosely = 1;
1818                                 http_is_verbose = 1;
1819                                 continue;
1820                         }
1821                         if (!strcmp(arg, "-d")) {
1822                                 delete_branch = 1;
1823                                 continue;
1824                         }
1825                         if (!strcmp(arg, "-D")) {
1826                                 delete_branch = 1;
1827                                 force_delete = 1;
1828                                 continue;
1829                         }
1830                 }
1831                 if (!repo->url) {
1832                         char *path = strstr(arg, "//");
1833                         repo->url = arg;
1834                         repo->path_len = strlen(arg);
1835                         if (path) {
1836                                 repo->path = strchr(path+2, '/');
1837                                 if (repo->path)
1838                                         repo->path_len = strlen(repo->path);
1839                         }
1840                         continue;
1841                 }
1842                 refspec = argv;
1843                 nr_refspec = argc - i;
1844                 break;
1845         }
1846
1847 #ifndef USE_CURL_MULTI
1848         die("git-push is not available for http/https repository when not compiled with USE_CURL_MULTI");
1849 #endif
1850
1851         if (!repo->url)
1852                 usage(http_push_usage);
1853
1854         if (delete_branch && nr_refspec != 1)
1855                 die("You must specify only one branch name when deleting a remote branch");
1856
1857         memset(remote_dir_exists, -1, 256);
1858
1859         /*
1860          * Create a minimum remote by hand to give to http_init(),
1861          * primarily to allow it to look at the URL.
1862          */
1863         remote = xcalloc(sizeof(*remote), 1);
1864         ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
1865         remote->url[remote->url_nr++] = repo->url;
1866         http_init(remote);
1867
1868         if (repo->url && repo->url[strlen(repo->url)-1] != '/') {
1869                 rewritten_url = xmalloc(strlen(repo->url)+2);
1870                 strcpy(rewritten_url, repo->url);
1871                 strcat(rewritten_url, "/");
1872                 repo->path = rewritten_url + (repo->path - repo->url);
1873                 repo->path_len++;
1874                 repo->url = rewritten_url;
1875         }
1876
1877 #ifdef USE_CURL_MULTI
1878         is_running_queue = 0;
1879 #endif
1880
1881         /* Verify DAV compliance/lock support */
1882         if (!locking_available()) {
1883                 rc = 1;
1884                 goto cleanup;
1885         }
1886
1887         sigchain_push_common(remove_locks_on_signal);
1888
1889         /* Check whether the remote has server info files */
1890         repo->can_update_info_refs = 0;
1891         repo->has_info_refs = remote_exists("info/refs");
1892         repo->has_info_packs = remote_exists("objects/info/packs");
1893         if (repo->has_info_refs) {
1894                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
1895                 if (info_ref_lock)
1896                         repo->can_update_info_refs = 1;
1897                 else {
1898                         error("cannot lock existing info/refs");
1899                         rc = 1;
1900                         goto cleanup;
1901                 }
1902         }
1903         if (repo->has_info_packs)
1904                 fetch_indices();
1905
1906         /* Get a list of all local and remote heads to validate refspecs */
1907         local_refs = get_local_heads();
1908         fprintf(stderr, "Fetching remote heads...\n");
1909         get_dav_remote_heads();
1910         run_request_queue();
1911
1912         /* Remove a remote branch if -d or -D was specified */
1913         if (delete_branch) {
1914                 if (delete_remote_branch(refspec[0], force_delete) == -1)
1915                         fprintf(stderr, "Unable to delete remote branch %s\n",
1916                                 refspec[0]);
1917                 goto cleanup;
1918         }
1919
1920         /* match them up */
1921         if (match_refs(local_refs, &remote_refs,
1922                        nr_refspec, (const char **) refspec, push_all)) {
1923                 rc = -1;
1924                 goto cleanup;
1925         }
1926         if (!remote_refs) {
1927                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
1928                 rc = 0;
1929                 goto cleanup;
1930         }
1931
1932         new_refs = 0;
1933         for (ref = remote_refs; ref; ref = ref->next) {
1934                 char old_hex[60], *new_hex;
1935                 const char *commit_argv[5];
1936                 int commit_argc;
1937                 char *new_sha1_hex, *old_sha1_hex;
1938
1939                 if (!ref->peer_ref)
1940                         continue;
1941
1942                 if (is_null_sha1(ref->peer_ref->new_sha1)) {
1943                         if (delete_remote_branch(ref->name, 1) == -1) {
1944                                 error("Could not remove %s", ref->name);
1945                                 rc = -4;
1946                         }
1947                         new_refs++;
1948                         continue;
1949                 }
1950
1951                 if (!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
1952                         if (push_verbosely || 1)
1953                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
1954                         continue;
1955                 }
1956
1957                 if (!force_all &&
1958                     !is_null_sha1(ref->old_sha1) &&
1959                     !ref->force) {
1960                         if (!has_sha1_file(ref->old_sha1) ||
1961                             !ref_newer(ref->peer_ref->new_sha1,
1962                                        ref->old_sha1)) {
1963                                 /*
1964                                  * We do not have the remote ref, or
1965                                  * we know that the remote ref is not
1966                                  * an ancestor of what we are trying to
1967                                  * push.  Either way this can be losing
1968                                  * commits at the remote end and likely
1969                                  * we were not up to date to begin with.
1970                                  */
1971                                 error("remote '%s' is not an ancestor of\n"
1972                                       "local '%s'.\n"
1973                                       "Maybe you are not up-to-date and "
1974                                       "need to pull first?",
1975                                       ref->name,
1976                                       ref->peer_ref->name);
1977                                 rc = -2;
1978                                 continue;
1979                         }
1980                 }
1981                 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1982                 new_refs++;
1983                 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
1984                 new_hex = sha1_to_hex(ref->new_sha1);
1985
1986                 fprintf(stderr, "updating '%s'", ref->name);
1987                 if (strcmp(ref->name, ref->peer_ref->name))
1988                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
1989                 fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
1990                 if (dry_run)
1991                         continue;
1992
1993                 /* Lock remote branch ref */
1994                 ref_lock = lock_remote(ref->name, LOCK_TIME);
1995                 if (ref_lock == NULL) {
1996                         fprintf(stderr, "Unable to lock remote branch %s\n",
1997                                 ref->name);
1998                         rc = 1;
1999                         continue;
2000                 }
2001
2002                 /* Set up revision info for this refspec */
2003                 commit_argc = 3;
2004                 new_sha1_hex = xstrdup(sha1_to_hex(ref->new_sha1));
2005                 old_sha1_hex = NULL;
2006                 commit_argv[1] = "--objects";
2007                 commit_argv[2] = new_sha1_hex;
2008                 if (!push_all && !is_null_sha1(ref->old_sha1)) {
2009                         old_sha1_hex = xmalloc(42);
2010                         sprintf(old_sha1_hex, "^%s",
2011                                 sha1_to_hex(ref->old_sha1));
2012                         commit_argv[3] = old_sha1_hex;
2013                         commit_argc++;
2014                 }
2015                 commit_argv[commit_argc] = NULL;
2016                 init_revisions(&revs, setup_git_directory());
2017                 setup_revisions(commit_argc, commit_argv, &revs, NULL);
2018                 revs.edge_hint = 0; /* just in case */
2019                 free(new_sha1_hex);
2020                 if (old_sha1_hex) {
2021                         free(old_sha1_hex);
2022                         commit_argv[1] = NULL;
2023                 }
2024
2025                 /* Generate a list of objects that need to be pushed */
2026                 pushing = 0;
2027                 if (prepare_revision_walk(&revs))
2028                         die("revision walk setup failed");
2029                 mark_edges_uninteresting(revs.commits, &revs, NULL);
2030                 objects_to_send = get_delta(&revs, ref_lock);
2031                 finish_all_active_slots();
2032
2033                 /* Push missing objects to remote, this would be a
2034                    convenient time to pack them first if appropriate. */
2035                 pushing = 1;
2036                 if (objects_to_send)
2037                         fprintf(stderr, "    sending %d objects\n",
2038                                 objects_to_send);
2039
2040                 run_request_queue();
2041
2042                 /* Update the remote branch if all went well */
2043                 if (aborted || !update_remote(ref->new_sha1, ref_lock))
2044                         rc = 1;
2045
2046                 if (!rc)
2047                         fprintf(stderr, "    done\n");
2048                 unlock_remote(ref_lock);
2049                 check_locks();
2050         }
2051
2052         /* Update remote server info if appropriate */
2053         if (repo->has_info_refs && new_refs) {
2054                 if (info_ref_lock && repo->can_update_info_refs) {
2055                         fprintf(stderr, "Updating remote server info\n");
2056                         if (!dry_run)
2057                                 update_remote_info_refs(info_ref_lock);
2058                 } else {
2059                         fprintf(stderr, "Unable to update server info\n");
2060                 }
2061         }
2062
2063  cleanup:
2064         free(rewritten_url);
2065         if (info_ref_lock)
2066                 unlock_remote(info_ref_lock);
2067         free(repo);
2068
2069         http_cleanup();
2070
2071         request = request_queue_head;
2072         while (request != NULL) {
2073                 next_request = request->next;
2074                 release_request(request);
2075                 request = next_request;
2076         }
2077
2078         return rc;
2079 }