Merge branch 'maint-1.7.3' into maint-1.7.4
[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 static int helper_status;
82
83 static struct object_list *objects;
84
85 struct repo {
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         struct object *obj;
112         char *url;
113         char *dest;
114         struct remote_lock *lock;
115         struct curl_slist *headers;
116         struct buffer buffer;
117         enum transfer_state state;
118         CURLcode curl_result;
119         char errorstr[CURL_ERROR_SIZE];
120         long http_code;
121         void *userData;
122         struct active_request_slot *slot;
123         struct transfer_request *next;
124 };
125
126 static struct transfer_request *request_queue_head;
127
128 struct xml_ctx {
129         char *name;
130         int len;
131         char *cdata;
132         void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
133         void *userData;
134 };
135
136 struct remote_lock {
137         char *url;
138         char *owner;
139         char *token;
140         char tmpfile_suffix[41];
141         time_t start_time;
142         long timeout;
143         int refreshing;
144         struct remote_lock *next;
145 };
146
147 /* Flags that control remote_ls processing */
148 #define PROCESS_FILES (1u << 0)
149 #define PROCESS_DIRS  (1u << 1)
150 #define RECURSIVE     (1u << 2)
151
152 /* Flags that remote_ls passes to callback functions */
153 #define IS_DIR (1u << 0)
154
155 struct remote_ls_ctx {
156         char *path;
157         void (*userFunc)(struct remote_ls_ctx *ls);
158         void *userData;
159         int flags;
160         char *dentry_name;
161         int dentry_flags;
162         struct remote_ls_ctx *parent;
163 };
164
165 /* get_dav_token_headers options */
166 enum dav_header_flag {
167         DAV_HEADER_IF = (1u << 0),
168         DAV_HEADER_LOCK = (1u << 1),
169         DAV_HEADER_TIMEOUT = (1u << 2)
170 };
171
172 static char *xml_entities(char *s)
173 {
174         struct strbuf buf = STRBUF_INIT;
175         while (*s) {
176                 size_t len = strcspn(s, "\"<>&");
177                 strbuf_add(&buf, s, len);
178                 s += len;
179                 switch (*s) {
180                 case '"':
181                         strbuf_addstr(&buf, "&quot;");
182                         break;
183                 case '<':
184                         strbuf_addstr(&buf, "&lt;");
185                         break;
186                 case '>':
187                         strbuf_addstr(&buf, "&gt;");
188                         break;
189                 case '&':
190                         strbuf_addstr(&buf, "&amp;");
191                         break;
192                 case 0:
193                         return strbuf_detach(&buf, NULL);
194                 }
195                 s++;
196         }
197         return strbuf_detach(&buf, NULL);
198 }
199
200 static struct curl_slist *get_dav_token_headers(struct remote_lock *lock, enum dav_header_flag options)
201 {
202         struct strbuf buf = STRBUF_INIT;
203         struct curl_slist *dav_headers = NULL;
204
205         if (options & DAV_HEADER_IF) {
206                 strbuf_addf(&buf, "If: (<%s>)", lock->token);
207                 dav_headers = curl_slist_append(dav_headers, buf.buf);
208                 strbuf_reset(&buf);
209         }
210         if (options & DAV_HEADER_LOCK) {
211                 strbuf_addf(&buf, "Lock-Token: <%s>", lock->token);
212                 dav_headers = curl_slist_append(dav_headers, buf.buf);
213                 strbuf_reset(&buf);
214         }
215         if (options & DAV_HEADER_TIMEOUT) {
216                 strbuf_addf(&buf, "Timeout: Second-%ld", lock->timeout);
217                 dav_headers = curl_slist_append(dav_headers, buf.buf);
218                 strbuf_reset(&buf);
219         }
220         strbuf_release(&buf);
221
222         return dav_headers;
223 }
224
225 static void finish_request(struct transfer_request *request);
226 static void release_request(struct transfer_request *request);
227
228 static void process_response(void *callback_data)
229 {
230         struct transfer_request *request =
231                 (struct transfer_request *)callback_data;
232
233         finish_request(request);
234 }
235
236 #ifdef USE_CURL_MULTI
237
238 static void start_fetch_loose(struct transfer_request *request)
239 {
240         struct active_request_slot *slot;
241         struct http_object_request *obj_req;
242
243         obj_req = new_http_object_request(repo->url, request->obj->sha1);
244         if (obj_req == NULL) {
245                 request->state = ABORTED;
246                 return;
247         }
248
249         slot = obj_req->slot;
250         slot->callback_func = process_response;
251         slot->callback_data = request;
252         request->slot = slot;
253         request->userData = obj_req;
254
255         /* Try to get the request started, abort the request on error */
256         request->state = RUN_FETCH_LOOSE;
257         if (!start_active_slot(slot)) {
258                 fprintf(stderr, "Unable to start GET request\n");
259                 repo->can_update_info_refs = 0;
260                 release_http_object_request(obj_req);
261                 release_request(request);
262         }
263 }
264
265 static void start_mkcol(struct transfer_request *request)
266 {
267         char *hex = sha1_to_hex(request->obj->sha1);
268         struct active_request_slot *slot;
269
270         request->url = get_remote_object_url(repo->url, hex, 1);
271
272         slot = get_active_slot();
273         slot->callback_func = process_response;
274         slot->callback_data = request;
275         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
276         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
277         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
278         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
279         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
280
281         if (start_active_slot(slot)) {
282                 request->slot = slot;
283                 request->state = RUN_MKCOL;
284         } else {
285                 request->state = ABORTED;
286                 free(request->url);
287                 request->url = NULL;
288         }
289 }
290 #endif
291
292 static void start_fetch_packed(struct transfer_request *request)
293 {
294         struct packed_git *target;
295
296         struct transfer_request *check_request = request_queue_head;
297         struct http_pack_request *preq;
298
299         target = find_sha1_pack(request->obj->sha1, repo->packs);
300         if (!target) {
301                 fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", sha1_to_hex(request->obj->sha1));
302                 repo->can_update_info_refs = 0;
303                 release_request(request);
304                 return;
305         }
306
307         fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
308         fprintf(stderr, " which contains %s\n", sha1_to_hex(request->obj->sha1));
309
310         preq = new_http_pack_request(target, repo->url);
311         if (preq == NULL) {
312                 release_http_pack_request(preq);
313                 repo->can_update_info_refs = 0;
314                 return;
315         }
316         preq->lst = &repo->packs;
317
318         /* Make sure there isn't another open request for this pack */
319         while (check_request) {
320                 if (check_request->state == RUN_FETCH_PACKED &&
321                     !strcmp(check_request->url, preq->url)) {
322                         release_http_pack_request(preq);
323                         release_request(request);
324                         return;
325                 }
326                 check_request = check_request->next;
327         }
328
329         preq->slot->callback_func = process_response;
330         preq->slot->callback_data = request;
331         request->slot = preq->slot;
332         request->userData = preq;
333
334         /* Try to get the request started, abort the request on error */
335         request->state = RUN_FETCH_PACKED;
336         if (!start_active_slot(preq->slot)) {
337                 fprintf(stderr, "Unable to start GET request\n");
338                 release_http_pack_request(preq);
339                 repo->can_update_info_refs = 0;
340                 release_request(request);
341         }
342 }
343
344 static void start_put(struct transfer_request *request)
345 {
346         char *hex = sha1_to_hex(request->obj->sha1);
347         struct active_request_slot *slot;
348         struct strbuf buf = STRBUF_INIT;
349         enum object_type type;
350         char hdr[50];
351         void *unpacked;
352         unsigned long len;
353         int hdrlen;
354         ssize_t size;
355         z_stream stream;
356
357         unpacked = read_sha1_file(request->obj->sha1, &type, &len);
358         hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1;
359
360         /* Set it up */
361         memset(&stream, 0, sizeof(stream));
362         deflateInit(&stream, zlib_compression_level);
363         size = deflateBound(&stream, len + hdrlen);
364         strbuf_init(&request->buffer.buf, size);
365         request->buffer.posn = 0;
366
367         /* Compress it */
368         stream.next_out = (unsigned char *)request->buffer.buf.buf;
369         stream.avail_out = size;
370
371         /* First header.. */
372         stream.next_in = (void *)hdr;
373         stream.avail_in = hdrlen;
374         while (deflate(&stream, 0) == Z_OK)
375                 /* nothing */;
376
377         /* Then the data itself.. */
378         stream.next_in = unpacked;
379         stream.avail_in = len;
380         while (deflate(&stream, Z_FINISH) == Z_OK)
381                 /* nothing */;
382         deflateEnd(&stream);
383         free(unpacked);
384
385         request->buffer.buf.len = stream.total_out;
386
387         strbuf_addstr(&buf, "Destination: ");
388         append_remote_object_url(&buf, repo->url, hex, 0);
389         request->dest = strbuf_detach(&buf, NULL);
390
391         append_remote_object_url(&buf, repo->url, hex, 0);
392         strbuf_add(&buf, request->lock->tmpfile_suffix, 41);
393         request->url = strbuf_detach(&buf, NULL);
394
395         slot = get_active_slot();
396         slot->callback_func = process_response;
397         slot->callback_data = request;
398         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &request->buffer);
399         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, request->buffer.buf.len);
400         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
401 #ifndef NO_CURL_IOCTL
402         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
403         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &request->buffer);
404 #endif
405         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
406         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
407         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
408         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
409         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
410         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
411
412         if (start_active_slot(slot)) {
413                 request->slot = slot;
414                 request->state = RUN_PUT;
415         } else {
416                 request->state = ABORTED;
417                 free(request->url);
418                 request->url = NULL;
419         }
420 }
421
422 static void start_move(struct transfer_request *request)
423 {
424         struct active_request_slot *slot;
425         struct curl_slist *dav_headers = NULL;
426
427         slot = get_active_slot();
428         slot->callback_func = process_response;
429         slot->callback_data = request;
430         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
431         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MOVE);
432         dav_headers = curl_slist_append(dav_headers, request->dest);
433         dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
434         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
435         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
436         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
437
438         if (start_active_slot(slot)) {
439                 request->slot = slot;
440                 request->state = RUN_MOVE;
441         } else {
442                 request->state = ABORTED;
443                 free(request->url);
444                 request->url = NULL;
445         }
446 }
447
448 static int refresh_lock(struct remote_lock *lock)
449 {
450         struct active_request_slot *slot;
451         struct slot_results results;
452         struct curl_slist *dav_headers;
453         int rc = 0;
454
455         lock->refreshing = 1;
456
457         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF | DAV_HEADER_TIMEOUT);
458
459         slot = get_active_slot();
460         slot->results = &results;
461         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
462         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
463         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
464         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
465         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
466
467         if (start_active_slot(slot)) {
468                 run_active_slot(slot);
469                 if (results.curl_result != CURLE_OK) {
470                         fprintf(stderr, "LOCK HTTP error %ld\n",
471                                 results.http_code);
472                 } else {
473                         lock->start_time = time(NULL);
474                         rc = 1;
475                 }
476         }
477
478         lock->refreshing = 0;
479         curl_slist_free_all(dav_headers);
480
481         return rc;
482 }
483
484 static void check_locks(void)
485 {
486         struct remote_lock *lock = repo->locks;
487         time_t current_time = time(NULL);
488         int time_remaining;
489
490         while (lock) {
491                 time_remaining = lock->start_time + lock->timeout -
492                         current_time;
493                 if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
494                         if (!refresh_lock(lock)) {
495                                 fprintf(stderr,
496                                         "Unable to refresh lock for %s\n",
497                                         lock->url);
498                                 aborted = 1;
499                                 return;
500                         }
501                 }
502                 lock = lock->next;
503         }
504 }
505
506 static void release_request(struct transfer_request *request)
507 {
508         struct transfer_request *entry = request_queue_head;
509
510         if (request == request_queue_head) {
511                 request_queue_head = request->next;
512         } else {
513                 while (entry->next != NULL && entry->next != request)
514                         entry = entry->next;
515                 if (entry->next == request)
516                         entry->next = entry->next->next;
517         }
518
519         free(request->url);
520         free(request);
521 }
522
523 static void finish_request(struct transfer_request *request)
524 {
525         struct http_pack_request *preq;
526         struct http_object_request *obj_req;
527
528         request->curl_result = request->slot->curl_result;
529         request->http_code = request->slot->http_code;
530         request->slot = NULL;
531
532         /* Keep locks active */
533         check_locks();
534
535         if (request->headers != NULL)
536                 curl_slist_free_all(request->headers);
537
538         /* URL is reused for MOVE after PUT */
539         if (request->state != RUN_PUT) {
540                 free(request->url);
541                 request->url = NULL;
542         }
543
544         if (request->state == RUN_MKCOL) {
545                 if (request->curl_result == CURLE_OK ||
546                     request->http_code == 405) {
547                         remote_dir_exists[request->obj->sha1[0]] = 1;
548                         start_put(request);
549                 } else {
550                         fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
551                                 sha1_to_hex(request->obj->sha1),
552                                 request->curl_result, request->http_code);
553                         request->state = ABORTED;
554                         aborted = 1;
555                 }
556         } else if (request->state == RUN_PUT) {
557                 if (request->curl_result == CURLE_OK) {
558                         start_move(request);
559                 } else {
560                         fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
561                                 sha1_to_hex(request->obj->sha1),
562                                 request->curl_result, request->http_code);
563                         request->state = ABORTED;
564                         aborted = 1;
565                 }
566         } else if (request->state == RUN_MOVE) {
567                 if (request->curl_result == CURLE_OK) {
568                         if (push_verbosely)
569                                 fprintf(stderr, "    sent %s\n",
570                                         sha1_to_hex(request->obj->sha1));
571                         request->obj->flags |= REMOTE;
572                         release_request(request);
573                 } else {
574                         fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
575                                 sha1_to_hex(request->obj->sha1),
576                                 request->curl_result, request->http_code);
577                         request->state = ABORTED;
578                         aborted = 1;
579                 }
580         } else if (request->state == RUN_FETCH_LOOSE) {
581                 obj_req = (struct http_object_request *)request->userData;
582
583                 if (finish_http_object_request(obj_req) == 0)
584                         if (obj_req->rename == 0)
585                                 request->obj->flags |= (LOCAL | REMOTE);
586
587                 /* Try fetching packed if necessary */
588                 if (request->obj->flags & LOCAL) {
589                         release_http_object_request(obj_req);
590                         release_request(request);
591                 } else
592                         start_fetch_packed(request);
593
594         } else if (request->state == RUN_FETCH_PACKED) {
595                 int fail = 1;
596                 if (request->curl_result != CURLE_OK) {
597                         fprintf(stderr, "Unable to get pack file %s\n%s",
598                                 request->url, curl_errorstr);
599                 } else {
600                         preq = (struct http_pack_request *)request->userData;
601
602                         if (preq) {
603                                 if (finish_http_pack_request(preq) == 0)
604                                         fail = 0;
605                                 release_http_pack_request(preq);
606                         }
607                 }
608                 if (fail)
609                         repo->can_update_info_refs = 0;
610                 release_request(request);
611         }
612 }
613
614 #ifdef USE_CURL_MULTI
615 static int is_running_queue;
616 static int fill_active_slot(void *unused)
617 {
618         struct transfer_request *request;
619
620         if (aborted || !is_running_queue)
621                 return 0;
622
623         for (request = request_queue_head; request; request = request->next) {
624                 if (request->state == NEED_FETCH) {
625                         start_fetch_loose(request);
626                         return 1;
627                 } else if (pushing && request->state == NEED_PUSH) {
628                         if (remote_dir_exists[request->obj->sha1[0]] == 1) {
629                                 start_put(request);
630                         } else {
631                                 start_mkcol(request);
632                         }
633                         return 1;
634                 }
635         }
636         return 0;
637 }
638 #endif
639
640 static void get_remote_object_list(unsigned char parent);
641
642 static void add_fetch_request(struct object *obj)
643 {
644         struct transfer_request *request;
645
646         check_locks();
647
648         /*
649          * Don't fetch the object if it's known to exist locally
650          * or is already in the request queue
651          */
652         if (remote_dir_exists[obj->sha1[0]] == -1)
653                 get_remote_object_list(obj->sha1[0]);
654         if (obj->flags & (LOCAL | FETCHING))
655                 return;
656
657         obj->flags |= FETCHING;
658         request = xmalloc(sizeof(*request));
659         request->obj = obj;
660         request->url = NULL;
661         request->lock = NULL;
662         request->headers = NULL;
663         request->state = NEED_FETCH;
664         request->next = request_queue_head;
665         request_queue_head = request;
666
667 #ifdef USE_CURL_MULTI
668         fill_active_slots();
669         step_active_slots();
670 #endif
671 }
672
673 static int add_send_request(struct object *obj, struct remote_lock *lock)
674 {
675         struct transfer_request *request = request_queue_head;
676         struct packed_git *target;
677
678         /* Keep locks active */
679         check_locks();
680
681         /*
682          * Don't push the object if it's known to exist on the remote
683          * or is already in the request queue
684          */
685         if (remote_dir_exists[obj->sha1[0]] == -1)
686                 get_remote_object_list(obj->sha1[0]);
687         if (obj->flags & (REMOTE | PUSHING))
688                 return 0;
689         target = find_sha1_pack(obj->sha1, repo->packs);
690         if (target) {
691                 obj->flags |= REMOTE;
692                 return 0;
693         }
694
695         obj->flags |= PUSHING;
696         request = xmalloc(sizeof(*request));
697         request->obj = obj;
698         request->url = NULL;
699         request->lock = lock;
700         request->headers = NULL;
701         request->state = NEED_PUSH;
702         request->next = request_queue_head;
703         request_queue_head = request;
704
705 #ifdef USE_CURL_MULTI
706         fill_active_slots();
707         step_active_slots();
708 #endif
709
710         return 1;
711 }
712
713 static int fetch_indices(void)
714 {
715         int ret;
716
717         if (push_verbosely)
718                 fprintf(stderr, "Getting pack list\n");
719
720         switch (http_get_info_packs(repo->url, &repo->packs)) {
721         case HTTP_OK:
722         case HTTP_MISSING_TARGET:
723                 ret = 0;
724                 break;
725         default:
726                 ret = -1;
727         }
728
729         return ret;
730 }
731
732 static void one_remote_object(const char *hex)
733 {
734         unsigned char sha1[20];
735         struct object *obj;
736
737         if (get_sha1_hex(hex, sha1) != 0)
738                 return;
739
740         obj = lookup_object(sha1);
741         if (!obj)
742                 obj = parse_object(sha1);
743
744         /* Ignore remote objects that don't exist locally */
745         if (!obj)
746                 return;
747
748         obj->flags |= REMOTE;
749         if (!object_list_contains(objects, obj))
750                 object_list_insert(obj, &objects);
751 }
752
753 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
754 {
755         int *lock_flags = (int *)ctx->userData;
756
757         if (tag_closed) {
758                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
759                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
760                             (*lock_flags & DAV_PROP_LOCKWR)) {
761                                 *lock_flags |= DAV_LOCK_OK;
762                         }
763                         *lock_flags &= DAV_LOCK_OK;
764                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
765                         *lock_flags |= DAV_PROP_LOCKWR;
766                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
767                         *lock_flags |= DAV_PROP_LOCKEX;
768                 }
769         }
770 }
771
772 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
773 {
774         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
775         git_SHA_CTX sha_ctx;
776         unsigned char lock_token_sha1[20];
777
778         if (tag_closed && ctx->cdata) {
779                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
780                         lock->owner = xmalloc(strlen(ctx->cdata) + 1);
781                         strcpy(lock->owner, ctx->cdata);
782                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
783                         if (!prefixcmp(ctx->cdata, "Second-"))
784                                 lock->timeout =
785                                         strtol(ctx->cdata + 7, NULL, 10);
786                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
787                         lock->token = xmalloc(strlen(ctx->cdata) + 1);
788                         strcpy(lock->token, ctx->cdata);
789
790                         git_SHA1_Init(&sha_ctx);
791                         git_SHA1_Update(&sha_ctx, lock->token, strlen(lock->token));
792                         git_SHA1_Final(lock_token_sha1, &sha_ctx);
793
794                         lock->tmpfile_suffix[0] = '_';
795                         memcpy(lock->tmpfile_suffix + 1, sha1_to_hex(lock_token_sha1), 40);
796                 }
797         }
798 }
799
800 static void one_remote_ref(char *refname);
801
802 static void
803 xml_start_tag(void *userData, const char *name, const char **atts)
804 {
805         struct xml_ctx *ctx = (struct xml_ctx *)userData;
806         const char *c = strchr(name, ':');
807         int new_len;
808
809         if (c == NULL)
810                 c = name;
811         else
812                 c++;
813
814         new_len = strlen(ctx->name) + strlen(c) + 2;
815
816         if (new_len > ctx->len) {
817                 ctx->name = xrealloc(ctx->name, new_len);
818                 ctx->len = new_len;
819         }
820         strcat(ctx->name, ".");
821         strcat(ctx->name, c);
822
823         free(ctx->cdata);
824         ctx->cdata = NULL;
825
826         ctx->userFunc(ctx, 0);
827 }
828
829 static void
830 xml_end_tag(void *userData, const char *name)
831 {
832         struct xml_ctx *ctx = (struct xml_ctx *)userData;
833         const char *c = strchr(name, ':');
834         char *ep;
835
836         ctx->userFunc(ctx, 1);
837
838         if (c == NULL)
839                 c = name;
840         else
841                 c++;
842
843         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
844         *ep = 0;
845 }
846
847 static void
848 xml_cdata(void *userData, const XML_Char *s, int len)
849 {
850         struct xml_ctx *ctx = (struct xml_ctx *)userData;
851         free(ctx->cdata);
852         ctx->cdata = xmemdupz(s, len);
853 }
854
855 static struct remote_lock *lock_remote(const char *path, long timeout)
856 {
857         struct active_request_slot *slot;
858         struct slot_results results;
859         struct buffer out_buffer = { STRBUF_INIT, 0 };
860         struct strbuf in_buffer = STRBUF_INIT;
861         char *url;
862         char *ep;
863         char timeout_header[25];
864         struct remote_lock *lock = NULL;
865         struct curl_slist *dav_headers = NULL;
866         struct xml_ctx ctx;
867         char *escaped;
868
869         url = xmalloc(strlen(repo->url) + strlen(path) + 1);
870         sprintf(url, "%s%s", repo->url, path);
871
872         /* Make sure leading directories exist for the remote ref */
873         ep = strchr(url + strlen(repo->url) + 1, '/');
874         while (ep) {
875                 char saved_character = ep[1];
876                 ep[1] = '\0';
877                 slot = get_active_slot();
878                 slot->results = &results;
879                 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
880                 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
881                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
882                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
883                 if (start_active_slot(slot)) {
884                         run_active_slot(slot);
885                         if (results.curl_result != CURLE_OK &&
886                             results.http_code != 405) {
887                                 fprintf(stderr,
888                                         "Unable to create branch path %s\n",
889                                         url);
890                                 free(url);
891                                 return NULL;
892                         }
893                 } else {
894                         fprintf(stderr, "Unable to start MKCOL request\n");
895                         free(url);
896                         return NULL;
897                 }
898                 ep[1] = saved_character;
899                 ep = strchr(ep + 1, '/');
900         }
901
902         escaped = xml_entities(git_default_email);
903         strbuf_addf(&out_buffer.buf, LOCK_REQUEST, escaped);
904         free(escaped);
905
906         sprintf(timeout_header, "Timeout: Second-%ld", timeout);
907         dav_headers = curl_slist_append(dav_headers, timeout_header);
908         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
909
910         slot = get_active_slot();
911         slot->results = &results;
912         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
913         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
914         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
915 #ifndef NO_CURL_IOCTL
916         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
917         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
918 #endif
919         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
920         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
921         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
922         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
923         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
924         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
925
926         lock = xcalloc(1, sizeof(*lock));
927         lock->timeout = -1;
928
929         if (start_active_slot(slot)) {
930                 run_active_slot(slot);
931                 if (results.curl_result == CURLE_OK) {
932                         XML_Parser parser = XML_ParserCreate(NULL);
933                         enum XML_Status result;
934                         ctx.name = xcalloc(10, 1);
935                         ctx.len = 0;
936                         ctx.cdata = NULL;
937                         ctx.userFunc = handle_new_lock_ctx;
938                         ctx.userData = lock;
939                         XML_SetUserData(parser, &ctx);
940                         XML_SetElementHandler(parser, xml_start_tag,
941                                               xml_end_tag);
942                         XML_SetCharacterDataHandler(parser, xml_cdata);
943                         result = XML_Parse(parser, in_buffer.buf,
944                                            in_buffer.len, 1);
945                         free(ctx.name);
946                         if (result != XML_STATUS_OK) {
947                                 fprintf(stderr, "XML error: %s\n",
948                                         XML_ErrorString(
949                                                 XML_GetErrorCode(parser)));
950                                 lock->timeout = -1;
951                         }
952                         XML_ParserFree(parser);
953                 }
954         } else {
955                 fprintf(stderr, "Unable to start LOCK request\n");
956         }
957
958         curl_slist_free_all(dav_headers);
959         strbuf_release(&out_buffer.buf);
960         strbuf_release(&in_buffer);
961
962         if (lock->token == NULL || lock->timeout <= 0) {
963                 free(lock->token);
964                 free(lock->owner);
965                 free(url);
966                 free(lock);
967                 lock = NULL;
968         } else {
969                 lock->url = url;
970                 lock->start_time = time(NULL);
971                 lock->next = repo->locks;
972                 repo->locks = lock;
973         }
974
975         return lock;
976 }
977
978 static int unlock_remote(struct remote_lock *lock)
979 {
980         struct active_request_slot *slot;
981         struct slot_results results;
982         struct remote_lock *prev = repo->locks;
983         struct curl_slist *dav_headers;
984         int rc = 0;
985
986         dav_headers = get_dav_token_headers(lock, DAV_HEADER_LOCK);
987
988         slot = get_active_slot();
989         slot->results = &results;
990         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
991         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
992         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
993         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
994
995         if (start_active_slot(slot)) {
996                 run_active_slot(slot);
997                 if (results.curl_result == CURLE_OK)
998                         rc = 1;
999                 else
1000                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
1001                                 results.http_code);
1002         } else {
1003                 fprintf(stderr, "Unable to start UNLOCK request\n");
1004         }
1005
1006         curl_slist_free_all(dav_headers);
1007
1008         if (repo->locks == lock) {
1009                 repo->locks = lock->next;
1010         } else {
1011                 while (prev && prev->next != lock)
1012                         prev = prev->next;
1013                 if (prev)
1014                         prev->next = prev->next->next;
1015         }
1016
1017         free(lock->owner);
1018         free(lock->url);
1019         free(lock->token);
1020         free(lock);
1021
1022         return rc;
1023 }
1024
1025 static void remove_locks(void)
1026 {
1027         struct remote_lock *lock = repo->locks;
1028
1029         fprintf(stderr, "Removing remote locks...\n");
1030         while (lock) {
1031                 struct remote_lock *next = lock->next;
1032                 unlock_remote(lock);
1033                 lock = next;
1034         }
1035 }
1036
1037 static void remove_locks_on_signal(int signo)
1038 {
1039         remove_locks();
1040         sigchain_pop(signo);
1041         raise(signo);
1042 }
1043
1044 static void remote_ls(const char *path, int flags,
1045                       void (*userFunc)(struct remote_ls_ctx *ls),
1046                       void *userData);
1047
1048 static void process_ls_object(struct remote_ls_ctx *ls)
1049 {
1050         unsigned int *parent = (unsigned int *)ls->userData;
1051         char *path = ls->dentry_name;
1052         char *obj_hex;
1053
1054         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1055                 remote_dir_exists[*parent] = 1;
1056                 return;
1057         }
1058
1059         if (strlen(path) != 49)
1060                 return;
1061         path += 8;
1062         obj_hex = xmalloc(strlen(path));
1063         /* NB: path is not null-terminated, can not use strlcpy here */
1064         memcpy(obj_hex, path, 2);
1065         strcpy(obj_hex + 2, path + 3);
1066         one_remote_object(obj_hex);
1067         free(obj_hex);
1068 }
1069
1070 static void process_ls_ref(struct remote_ls_ctx *ls)
1071 {
1072         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1073                 fprintf(stderr, "  %s\n", ls->dentry_name);
1074                 return;
1075         }
1076
1077         if (!(ls->dentry_flags & IS_DIR))
1078                 one_remote_ref(ls->dentry_name);
1079 }
1080
1081 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1082 {
1083         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1084
1085         if (tag_closed) {
1086                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1087                         if (ls->dentry_flags & IS_DIR) {
1088
1089                                 /* ensure collection names end with slash */
1090                                 str_end_url_with_slash(ls->dentry_name, &ls->dentry_name);
1091
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                                 const char *url = repo->url;
1115                                 if (repo->path)
1116                                         url = repo->path;
1117                                 if (strncmp(path, url, repo->path_len))
1118                                         error("Parsed path '%s' does not match url: '%s'\n",
1119                                               path, url);
1120                                 else {
1121                                         path += repo->path_len;
1122                                         ls->dentry_name = xstrdup(path);
1123                                 }
1124                         }
1125                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1126                         ls->dentry_flags |= IS_DIR;
1127                 }
1128         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1129                 free(ls->dentry_name);
1130                 ls->dentry_name = NULL;
1131                 ls->dentry_flags = 0;
1132         }
1133 }
1134
1135 /*
1136  * NEEDSWORK: remote_ls() ignores info/refs on the remote side.  But it
1137  * should _only_ heed the information from that file, instead of trying to
1138  * determine the refs from the remote file system (badly: it does not even
1139  * know about packed-refs).
1140  */
1141 static void remote_ls(const char *path, int flags,
1142                       void (*userFunc)(struct remote_ls_ctx *ls),
1143                       void *userData)
1144 {
1145         char *url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1146         struct active_request_slot *slot;
1147         struct slot_results results;
1148         struct strbuf in_buffer = STRBUF_INIT;
1149         struct buffer out_buffer = { STRBUF_INIT, 0 };
1150         struct curl_slist *dav_headers = NULL;
1151         struct xml_ctx ctx;
1152         struct remote_ls_ctx ls;
1153
1154         ls.flags = flags;
1155         ls.path = xstrdup(path);
1156         ls.dentry_name = NULL;
1157         ls.dentry_flags = 0;
1158         ls.userData = userData;
1159         ls.userFunc = userFunc;
1160
1161         sprintf(url, "%s%s", repo->url, path);
1162
1163         strbuf_addf(&out_buffer.buf, PROPFIND_ALL_REQUEST);
1164
1165         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1166         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1167
1168         slot = get_active_slot();
1169         slot->results = &results;
1170         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1171         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1172         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1173 #ifndef NO_CURL_IOCTL
1174         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1175         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1176 #endif
1177         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1178         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1179         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1180         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1181         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1182         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1183
1184         if (start_active_slot(slot)) {
1185                 run_active_slot(slot);
1186                 if (results.curl_result == CURLE_OK) {
1187                         XML_Parser parser = XML_ParserCreate(NULL);
1188                         enum XML_Status result;
1189                         ctx.name = xcalloc(10, 1);
1190                         ctx.len = 0;
1191                         ctx.cdata = NULL;
1192                         ctx.userFunc = handle_remote_ls_ctx;
1193                         ctx.userData = &ls;
1194                         XML_SetUserData(parser, &ctx);
1195                         XML_SetElementHandler(parser, xml_start_tag,
1196                                               xml_end_tag);
1197                         XML_SetCharacterDataHandler(parser, xml_cdata);
1198                         result = XML_Parse(parser, in_buffer.buf,
1199                                            in_buffer.len, 1);
1200                         free(ctx.name);
1201
1202                         if (result != XML_STATUS_OK) {
1203                                 fprintf(stderr, "XML error: %s\n",
1204                                         XML_ErrorString(
1205                                                 XML_GetErrorCode(parser)));
1206                         }
1207                         XML_ParserFree(parser);
1208                 }
1209         } else {
1210                 fprintf(stderr, "Unable to start PROPFIND request\n");
1211         }
1212
1213         free(ls.path);
1214         free(url);
1215         strbuf_release(&out_buffer.buf);
1216         strbuf_release(&in_buffer);
1217         curl_slist_free_all(dav_headers);
1218 }
1219
1220 static void get_remote_object_list(unsigned char parent)
1221 {
1222         char path[] = "objects/XX/";
1223         static const char hex[] = "0123456789abcdef";
1224         unsigned int val = parent;
1225
1226         path[8] = hex[val >> 4];
1227         path[9] = hex[val & 0xf];
1228         remote_dir_exists[val] = 0;
1229         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1230                   process_ls_object, &val);
1231 }
1232
1233 static int locking_available(void)
1234 {
1235         struct active_request_slot *slot;
1236         struct slot_results results;
1237         struct strbuf in_buffer = STRBUF_INIT;
1238         struct buffer out_buffer = { STRBUF_INIT, 0 };
1239         struct curl_slist *dav_headers = NULL;
1240         struct xml_ctx ctx;
1241         int lock_flags = 0;
1242         char *escaped;
1243
1244         escaped = xml_entities(repo->url);
1245         strbuf_addf(&out_buffer.buf, PROPFIND_SUPPORTEDLOCK_REQUEST, escaped);
1246         free(escaped);
1247
1248         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1249         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1250
1251         slot = get_active_slot();
1252         slot->results = &results;
1253         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1254         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1255         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1256 #ifndef NO_CURL_IOCTL
1257         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1258         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1259 #endif
1260         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1261         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1262         curl_easy_setopt(slot->curl, CURLOPT_URL, repo->url);
1263         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1264         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1265         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1266
1267         if (start_active_slot(slot)) {
1268                 run_active_slot(slot);
1269                 if (results.curl_result == CURLE_OK) {
1270                         XML_Parser parser = XML_ParserCreate(NULL);
1271                         enum XML_Status result;
1272                         ctx.name = xcalloc(10, 1);
1273                         ctx.len = 0;
1274                         ctx.cdata = NULL;
1275                         ctx.userFunc = handle_lockprop_ctx;
1276                         ctx.userData = &lock_flags;
1277                         XML_SetUserData(parser, &ctx);
1278                         XML_SetElementHandler(parser, xml_start_tag,
1279                                               xml_end_tag);
1280                         result = XML_Parse(parser, in_buffer.buf,
1281                                            in_buffer.len, 1);
1282                         free(ctx.name);
1283
1284                         if (result != XML_STATUS_OK) {
1285                                 fprintf(stderr, "XML error: %s\n",
1286                                         XML_ErrorString(
1287                                                 XML_GetErrorCode(parser)));
1288                                 lock_flags = 0;
1289                         }
1290                         XML_ParserFree(parser);
1291                         if (!lock_flags)
1292                                 error("no DAV locking support on %s",
1293                                       repo->url);
1294
1295                 } else {
1296                         error("Cannot access URL %s, return code %d",
1297                               repo->url, results.curl_result);
1298                         lock_flags = 0;
1299                 }
1300         } else {
1301                 error("Unable to start PROPFIND request on %s", repo->url);
1302         }
1303
1304         strbuf_release(&out_buffer.buf);
1305         strbuf_release(&in_buffer);
1306         curl_slist_free_all(dav_headers);
1307
1308         return lock_flags;
1309 }
1310
1311 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1312 {
1313         struct object_list *entry = xmalloc(sizeof(struct object_list));
1314         entry->item = obj;
1315         entry->next = *p;
1316         *p = entry;
1317         return &entry->next;
1318 }
1319
1320 static struct object_list **process_blob(struct blob *blob,
1321                                          struct object_list **p,
1322                                          struct name_path *path,
1323                                          const char *name)
1324 {
1325         struct object *obj = &blob->object;
1326
1327         obj->flags |= LOCAL;
1328
1329         if (obj->flags & (UNINTERESTING | SEEN))
1330                 return p;
1331
1332         obj->flags |= SEEN;
1333         return add_one_object(obj, p);
1334 }
1335
1336 static struct object_list **process_tree(struct tree *tree,
1337                                          struct object_list **p,
1338                                          struct name_path *path,
1339                                          const char *name)
1340 {
1341         struct object *obj = &tree->object;
1342         struct tree_desc desc;
1343         struct name_entry entry;
1344         struct name_path me;
1345
1346         obj->flags |= LOCAL;
1347
1348         if (obj->flags & (UNINTERESTING | SEEN))
1349                 return p;
1350         if (parse_tree(tree) < 0)
1351                 die("bad tree object %s", sha1_to_hex(obj->sha1));
1352
1353         obj->flags |= SEEN;
1354         name = xstrdup(name);
1355         p = add_one_object(obj, p);
1356         me.up = path;
1357         me.elem = name;
1358         me.elem_len = strlen(name);
1359
1360         init_tree_desc(&desc, tree->buffer, tree->size);
1361
1362         while (tree_entry(&desc, &entry))
1363                 switch (object_type(entry.mode)) {
1364                 case OBJ_TREE:
1365                         p = process_tree(lookup_tree(entry.sha1), p, &me, name);
1366                         break;
1367                 case OBJ_BLOB:
1368                         p = process_blob(lookup_blob(entry.sha1), p, &me, name);
1369                         break;
1370                 default:
1371                         /* Subproject commit - not in this repository */
1372                         break;
1373                 }
1374
1375         free(tree->buffer);
1376         tree->buffer = NULL;
1377         return p;
1378 }
1379
1380 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1381 {
1382         int i;
1383         struct commit *commit;
1384         struct object_list **p = &objects;
1385         int count = 0;
1386
1387         while ((commit = get_revision(revs)) != NULL) {
1388                 p = process_tree(commit->tree, p, NULL, "");
1389                 commit->object.flags |= LOCAL;
1390                 if (!(commit->object.flags & UNINTERESTING))
1391                         count += add_send_request(&commit->object, lock);
1392         }
1393
1394         for (i = 0; i < revs->pending.nr; i++) {
1395                 struct object_array_entry *entry = revs->pending.objects + i;
1396                 struct object *obj = entry->item;
1397                 const char *name = entry->name;
1398
1399                 if (obj->flags & (UNINTERESTING | SEEN))
1400                         continue;
1401                 if (obj->type == OBJ_TAG) {
1402                         obj->flags |= SEEN;
1403                         p = add_one_object(obj, p);
1404                         continue;
1405                 }
1406                 if (obj->type == OBJ_TREE) {
1407                         p = process_tree((struct tree *)obj, p, NULL, name);
1408                         continue;
1409                 }
1410                 if (obj->type == OBJ_BLOB) {
1411                         p = process_blob((struct blob *)obj, p, NULL, name);
1412                         continue;
1413                 }
1414                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1415         }
1416
1417         while (objects) {
1418                 if (!(objects->item->flags & UNINTERESTING))
1419                         count += add_send_request(objects->item, lock);
1420                 objects = objects->next;
1421         }
1422
1423         return count;
1424 }
1425
1426 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1427 {
1428         struct active_request_slot *slot;
1429         struct slot_results results;
1430         struct buffer out_buffer = { STRBUF_INIT, 0 };
1431         struct curl_slist *dav_headers;
1432
1433         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1434
1435         strbuf_addf(&out_buffer.buf, "%s\n", sha1_to_hex(sha1));
1436
1437         slot = get_active_slot();
1438         slot->results = &results;
1439         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1440         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1441         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1442 #ifndef NO_CURL_IOCTL
1443         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1444         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1445 #endif
1446         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1447         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1448         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1449         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1450         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1451         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1452
1453         if (start_active_slot(slot)) {
1454                 run_active_slot(slot);
1455                 strbuf_release(&out_buffer.buf);
1456                 if (results.curl_result != CURLE_OK) {
1457                         fprintf(stderr,
1458                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1459                                 results.curl_result, results.http_code);
1460                         /* We should attempt recovery? */
1461                         return 0;
1462                 }
1463         } else {
1464                 strbuf_release(&out_buffer.buf);
1465                 fprintf(stderr, "Unable to start PUT request\n");
1466                 return 0;
1467         }
1468
1469         return 1;
1470 }
1471
1472 static struct ref *remote_refs;
1473
1474 static void one_remote_ref(char *refname)
1475 {
1476         struct ref *ref;
1477         struct object *obj;
1478
1479         ref = alloc_ref(refname);
1480
1481         if (http_fetch_ref(repo->url, ref) != 0) {
1482                 fprintf(stderr,
1483                         "Unable to fetch ref %s from %s\n",
1484                         refname, repo->url);
1485                 free(ref);
1486                 return;
1487         }
1488
1489         /*
1490          * Fetch a copy of the object if it doesn't exist locally - it
1491          * may be required for updating server info later.
1492          */
1493         if (repo->can_update_info_refs && !has_sha1_file(ref->old_sha1)) {
1494                 obj = lookup_unknown_object(ref->old_sha1);
1495                 if (obj) {
1496                         fprintf(stderr, "  fetch %s for %s\n",
1497                                 sha1_to_hex(ref->old_sha1), refname);
1498                         add_fetch_request(obj);
1499                 }
1500         }
1501
1502         ref->next = remote_refs;
1503         remote_refs = ref;
1504 }
1505
1506 static void get_dav_remote_heads(void)
1507 {
1508         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1509 }
1510
1511 static void add_remote_info_ref(struct remote_ls_ctx *ls)
1512 {
1513         struct strbuf *buf = (struct strbuf *)ls->userData;
1514         struct object *o;
1515         int len;
1516         char *ref_info;
1517         struct ref *ref;
1518
1519         ref = alloc_ref(ls->dentry_name);
1520
1521         if (http_fetch_ref(repo->url, ref) != 0) {
1522                 fprintf(stderr,
1523                         "Unable to fetch ref %s from %s\n",
1524                         ls->dentry_name, repo->url);
1525                 aborted = 1;
1526                 free(ref);
1527                 return;
1528         }
1529
1530         o = parse_object(ref->old_sha1);
1531         if (!o) {
1532                 fprintf(stderr,
1533                         "Unable to parse object %s for remote ref %s\n",
1534                         sha1_to_hex(ref->old_sha1), ls->dentry_name);
1535                 aborted = 1;
1536                 free(ref);
1537                 return;
1538         }
1539
1540         len = strlen(ls->dentry_name) + 42;
1541         ref_info = xcalloc(len + 1, 1);
1542         sprintf(ref_info, "%s   %s\n",
1543                 sha1_to_hex(ref->old_sha1), ls->dentry_name);
1544         fwrite_buffer(ref_info, 1, len, buf);
1545         free(ref_info);
1546
1547         if (o->type == OBJ_TAG) {
1548                 o = deref_tag(o, ls->dentry_name, 0);
1549                 if (o) {
1550                         len = strlen(ls->dentry_name) + 45;
1551                         ref_info = xcalloc(len + 1, 1);
1552                         sprintf(ref_info, "%s   %s^{}\n",
1553                                 sha1_to_hex(o->sha1), ls->dentry_name);
1554                         fwrite_buffer(ref_info, 1, len, buf);
1555                         free(ref_info);
1556                 }
1557         }
1558         free(ref);
1559 }
1560
1561 static void update_remote_info_refs(struct remote_lock *lock)
1562 {
1563         struct buffer buffer = { STRBUF_INIT, 0 };
1564         struct active_request_slot *slot;
1565         struct slot_results results;
1566         struct curl_slist *dav_headers;
1567
1568         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
1569                   add_remote_info_ref, &buffer.buf);
1570         if (!aborted) {
1571                 dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1572
1573                 slot = get_active_slot();
1574                 slot->results = &results;
1575                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, &buffer);
1576                 curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, buffer.buf.len);
1577                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1578 #ifndef NO_CURL_IOCTL
1579                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1580                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &buffer);
1581 #endif
1582                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1583                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1584                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1585                 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1586                 curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1587                 curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1588
1589                 if (start_active_slot(slot)) {
1590                         run_active_slot(slot);
1591                         if (results.curl_result != CURLE_OK) {
1592                                 fprintf(stderr,
1593                                         "PUT error: curl result=%d, HTTP code=%ld\n",
1594                                         results.curl_result, results.http_code);
1595                         }
1596                 }
1597         }
1598         strbuf_release(&buffer.buf);
1599 }
1600
1601 static int remote_exists(const char *path)
1602 {
1603         char *url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1604         int ret;
1605
1606         sprintf(url, "%s%s", repo->url, path);
1607
1608         switch (http_get_strbuf(url, NULL, 0)) {
1609         case HTTP_OK:
1610                 ret = 1;
1611                 break;
1612         case HTTP_MISSING_TARGET:
1613                 ret = 0;
1614                 break;
1615         case HTTP_ERROR:
1616                 http_error(url, HTTP_ERROR);
1617         default:
1618                 ret = -1;
1619         }
1620         free(url);
1621         return ret;
1622 }
1623
1624 static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
1625 {
1626         char *url;
1627         struct strbuf buffer = STRBUF_INIT;
1628
1629         url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1630         sprintf(url, "%s%s", repo->url, path);
1631
1632         if (http_get_strbuf(url, &buffer, 0) != HTTP_OK)
1633                 die("Couldn't get %s for remote symref\n%s", url,
1634                     curl_errorstr);
1635         free(url);
1636
1637         free(*symref);
1638         *symref = NULL;
1639         hashclr(sha1);
1640
1641         if (buffer.len == 0)
1642                 return;
1643
1644         /* If it's a symref, set the refname; otherwise try for a sha1 */
1645         if (!prefixcmp((char *)buffer.buf, "ref: ")) {
1646                 *symref = xmemdupz((char *)buffer.buf + 5, buffer.len - 6);
1647         } else {
1648                 get_sha1_hex(buffer.buf, sha1);
1649         }
1650
1651         strbuf_release(&buffer);
1652 }
1653
1654 static int verify_merge_base(unsigned char *head_sha1, unsigned char *branch_sha1)
1655 {
1656         struct commit *head = lookup_commit(head_sha1);
1657         struct commit *branch = lookup_commit(branch_sha1);
1658         struct commit_list *merge_bases = get_merge_bases(head, branch, 1);
1659
1660         return (merge_bases && !merge_bases->next && merge_bases->item == branch);
1661 }
1662
1663 static int delete_remote_branch(char *pattern, int force)
1664 {
1665         struct ref *refs = remote_refs;
1666         struct ref *remote_ref = NULL;
1667         unsigned char head_sha1[20];
1668         char *symref = NULL;
1669         int match;
1670         int patlen = strlen(pattern);
1671         int i;
1672         struct active_request_slot *slot;
1673         struct slot_results results;
1674         char *url;
1675
1676         /* Find the remote branch(es) matching the specified branch name */
1677         for (match = 0; refs; refs = refs->next) {
1678                 char *name = refs->name;
1679                 int namelen = strlen(name);
1680                 if (namelen < patlen ||
1681                     memcmp(name + namelen - patlen, pattern, patlen))
1682                         continue;
1683                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
1684                         continue;
1685                 match++;
1686                 remote_ref = refs;
1687         }
1688         if (match == 0)
1689                 return error("No remote branch matches %s", pattern);
1690         if (match != 1)
1691                 return error("More than one remote branch matches %s",
1692                              pattern);
1693
1694         /*
1695          * Remote HEAD must be a symref (not exactly foolproof; a remote
1696          * symlink to a symref will look like a symref)
1697          */
1698         fetch_symref("HEAD", &symref, head_sha1);
1699         if (!symref)
1700                 return error("Remote HEAD is not a symref");
1701
1702         /* Remote branch must not be the remote HEAD */
1703         for (i=0; symref && i<MAXDEPTH; i++) {
1704                 if (!strcmp(remote_ref->name, symref))
1705                         return error("Remote branch %s is the current HEAD",
1706                                      remote_ref->name);
1707                 fetch_symref(symref, &symref, head_sha1);
1708         }
1709
1710         /* Run extra sanity checks if delete is not forced */
1711         if (!force) {
1712                 /* Remote HEAD must resolve to a known object */
1713                 if (symref)
1714                         return error("Remote HEAD symrefs too deep");
1715                 if (is_null_sha1(head_sha1))
1716                         return error("Unable to resolve remote HEAD");
1717                 if (!has_sha1_file(head_sha1))
1718                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
1719
1720                 /* Remote branch must resolve to a known object */
1721                 if (is_null_sha1(remote_ref->old_sha1))
1722                         return error("Unable to resolve remote branch %s",
1723                                      remote_ref->name);
1724                 if (!has_sha1_file(remote_ref->old_sha1))
1725                         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));
1726
1727                 /* Remote branch must be an ancestor of remote HEAD */
1728                 if (!verify_merge_base(head_sha1, remote_ref->old_sha1)) {
1729                         return error("The branch '%s' is not an ancestor "
1730                                      "of your current HEAD.\n"
1731                                      "If you are sure you want to delete it,"
1732                                      " run:\n\t'git http-push -D %s %s'",
1733                                      remote_ref->name, repo->url, pattern);
1734                 }
1735         }
1736
1737         /* Send delete request */
1738         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
1739         if (dry_run)
1740                 return 0;
1741         url = xmalloc(strlen(repo->url) + strlen(remote_ref->name) + 1);
1742         sprintf(url, "%s%s", repo->url, remote_ref->name);
1743         slot = get_active_slot();
1744         slot->results = &results;
1745         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1746         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1747         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1748         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_DELETE);
1749         if (start_active_slot(slot)) {
1750                 run_active_slot(slot);
1751                 free(url);
1752                 if (results.curl_result != CURLE_OK)
1753                         return error("DELETE request failed (%d/%ld)\n",
1754                                      results.curl_result, results.http_code);
1755         } else {
1756                 free(url);
1757                 return error("Unable to start DELETE request");
1758         }
1759
1760         return 0;
1761 }
1762
1763 static void run_request_queue(void)
1764 {
1765 #ifdef USE_CURL_MULTI
1766         is_running_queue = 1;
1767         fill_active_slots();
1768         add_fill_function(NULL, fill_active_slot);
1769 #endif
1770         do {
1771                 finish_all_active_slots();
1772 #ifdef USE_CURL_MULTI
1773                 fill_active_slots();
1774 #endif
1775         } while (request_queue_head && !aborted);
1776
1777 #ifdef USE_CURL_MULTI
1778         is_running_queue = 0;
1779 #endif
1780 }
1781
1782 int main(int argc, char **argv)
1783 {
1784         struct transfer_request *request;
1785         struct transfer_request *next_request;
1786         int nr_refspec = 0;
1787         char **refspec = NULL;
1788         struct remote_lock *ref_lock = NULL;
1789         struct remote_lock *info_ref_lock = NULL;
1790         struct rev_info revs;
1791         int delete_branch = 0;
1792         int force_delete = 0;
1793         int objects_to_send;
1794         int rc = 0;
1795         int i;
1796         int new_refs;
1797         struct ref *ref, *local_refs;
1798         struct remote *remote;
1799
1800         git_extract_argv0_path(argv[0]);
1801
1802         repo = xcalloc(sizeof(*repo), 1);
1803
1804         argv++;
1805         for (i = 1; i < argc; i++, argv++) {
1806                 char *arg = *argv;
1807
1808                 if (*arg == '-') {
1809                         if (!strcmp(arg, "--all")) {
1810                                 push_all = MATCH_REFS_ALL;
1811                                 continue;
1812                         }
1813                         if (!strcmp(arg, "--force")) {
1814                                 force_all = 1;
1815                                 continue;
1816                         }
1817                         if (!strcmp(arg, "--dry-run")) {
1818                                 dry_run = 1;
1819                                 continue;
1820                         }
1821                         if (!strcmp(arg, "--helper-status")) {
1822                                 helper_status = 1;
1823                                 continue;
1824                         }
1825                         if (!strcmp(arg, "--verbose")) {
1826                                 push_verbosely = 1;
1827                                 http_is_verbose = 1;
1828                                 continue;
1829                         }
1830                         if (!strcmp(arg, "-d")) {
1831                                 delete_branch = 1;
1832                                 continue;
1833                         }
1834                         if (!strcmp(arg, "-D")) {
1835                                 delete_branch = 1;
1836                                 force_delete = 1;
1837                                 continue;
1838                         }
1839                         if (!strcmp(arg, "-h"))
1840                                 usage(http_push_usage);
1841                 }
1842                 if (!repo->url) {
1843                         char *path = strstr(arg, "//");
1844                         str_end_url_with_slash(arg, &repo->url);
1845                         repo->path_len = strlen(repo->url);
1846                         if (path) {
1847                                 repo->path = strchr(path+2, '/');
1848                                 if (repo->path)
1849                                         repo->path_len = strlen(repo->path);
1850                         }
1851                         continue;
1852                 }
1853                 refspec = argv;
1854                 nr_refspec = argc - i;
1855                 break;
1856         }
1857
1858 #ifndef USE_CURL_MULTI
1859         die("git-push is not available for http/https repository when not compiled with USE_CURL_MULTI");
1860 #endif
1861
1862         if (!repo->url)
1863                 usage(http_push_usage);
1864
1865         if (delete_branch && nr_refspec != 1)
1866                 die("You must specify only one branch name when deleting a remote branch");
1867
1868         setup_git_directory();
1869
1870         memset(remote_dir_exists, -1, 256);
1871
1872         /*
1873          * Create a minimum remote by hand to give to http_init(),
1874          * primarily to allow it to look at the URL.
1875          */
1876         remote = xcalloc(sizeof(*remote), 1);
1877         ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
1878         remote->url[remote->url_nr++] = repo->url;
1879         http_init(remote);
1880
1881 #ifdef USE_CURL_MULTI
1882         is_running_queue = 0;
1883 #endif
1884
1885         /* Verify DAV compliance/lock support */
1886         if (!locking_available()) {
1887                 rc = 1;
1888                 goto cleanup;
1889         }
1890
1891         sigchain_push_common(remove_locks_on_signal);
1892
1893         /* Check whether the remote has server info files */
1894         repo->can_update_info_refs = 0;
1895         repo->has_info_refs = remote_exists("info/refs");
1896         repo->has_info_packs = remote_exists("objects/info/packs");
1897         if (repo->has_info_refs) {
1898                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
1899                 if (info_ref_lock)
1900                         repo->can_update_info_refs = 1;
1901                 else {
1902                         error("cannot lock existing info/refs");
1903                         rc = 1;
1904                         goto cleanup;
1905                 }
1906         }
1907         if (repo->has_info_packs)
1908                 fetch_indices();
1909
1910         /* Get a list of all local and remote heads to validate refspecs */
1911         local_refs = get_local_heads();
1912         fprintf(stderr, "Fetching remote heads...\n");
1913         get_dav_remote_heads();
1914         run_request_queue();
1915
1916         /* Remove a remote branch if -d or -D was specified */
1917         if (delete_branch) {
1918                 if (delete_remote_branch(refspec[0], force_delete) == -1) {
1919                         fprintf(stderr, "Unable to delete remote branch %s\n",
1920                                 refspec[0]);
1921                         if (helper_status)
1922                                 printf("error %s cannot remove\n", refspec[0]);
1923                 }
1924                 goto cleanup;
1925         }
1926
1927         /* match them up */
1928         if (match_refs(local_refs, &remote_refs,
1929                        nr_refspec, (const char **) refspec, push_all)) {
1930                 rc = -1;
1931                 goto cleanup;
1932         }
1933         if (!remote_refs) {
1934                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
1935                 if (helper_status)
1936                         printf("error null no match\n");
1937                 rc = 0;
1938                 goto cleanup;
1939         }
1940
1941         new_refs = 0;
1942         for (ref = remote_refs; ref; ref = ref->next) {
1943                 char old_hex[60], *new_hex;
1944                 const char *commit_argv[5];
1945                 int commit_argc;
1946                 char *new_sha1_hex, *old_sha1_hex;
1947
1948                 if (!ref->peer_ref)
1949                         continue;
1950
1951                 if (is_null_sha1(ref->peer_ref->new_sha1)) {
1952                         if (delete_remote_branch(ref->name, 1) == -1) {
1953                                 error("Could not remove %s", ref->name);
1954                                 if (helper_status)
1955                                         printf("error %s cannot remove\n", ref->name);
1956                                 rc = -4;
1957                         }
1958                         else if (helper_status)
1959                                 printf("ok %s\n", ref->name);
1960                         new_refs++;
1961                         continue;
1962                 }
1963
1964                 if (!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
1965                         if (push_verbosely)
1966                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
1967                         if (helper_status)
1968                                 printf("ok %s up to date\n", ref->name);
1969                         continue;
1970                 }
1971
1972                 if (!force_all &&
1973                     !is_null_sha1(ref->old_sha1) &&
1974                     !ref->force) {
1975                         if (!has_sha1_file(ref->old_sha1) ||
1976                             !ref_newer(ref->peer_ref->new_sha1,
1977                                        ref->old_sha1)) {
1978                                 /*
1979                                  * We do not have the remote ref, or
1980                                  * we know that the remote ref is not
1981                                  * an ancestor of what we are trying to
1982                                  * push.  Either way this can be losing
1983                                  * commits at the remote end and likely
1984                                  * we were not up to date to begin with.
1985                                  */
1986                                 error("remote '%s' is not an ancestor of\n"
1987                                       "local '%s'.\n"
1988                                       "Maybe you are not up-to-date and "
1989                                       "need to pull first?",
1990                                       ref->name,
1991                                       ref->peer_ref->name);
1992                                 if (helper_status)
1993                                         printf("error %s non-fast forward\n", ref->name);
1994                                 rc = -2;
1995                                 continue;
1996                         }
1997                 }
1998                 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1999                 new_refs++;
2000                 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
2001                 new_hex = sha1_to_hex(ref->new_sha1);
2002
2003                 fprintf(stderr, "updating '%s'", ref->name);
2004                 if (strcmp(ref->name, ref->peer_ref->name))
2005                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
2006                 fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
2007                 if (dry_run) {
2008                         if (helper_status)
2009                                 printf("ok %s\n", ref->name);
2010                         continue;
2011                 }
2012
2013                 /* Lock remote branch ref */
2014                 ref_lock = lock_remote(ref->name, LOCK_TIME);
2015                 if (ref_lock == NULL) {
2016                         fprintf(stderr, "Unable to lock remote branch %s\n",
2017                                 ref->name);
2018                         if (helper_status)
2019                                 printf("error %s lock error\n", ref->name);
2020                         rc = 1;
2021                         continue;
2022                 }
2023
2024                 /* Set up revision info for this refspec */
2025                 commit_argc = 3;
2026                 new_sha1_hex = xstrdup(sha1_to_hex(ref->new_sha1));
2027                 old_sha1_hex = NULL;
2028                 commit_argv[1] = "--objects";
2029                 commit_argv[2] = new_sha1_hex;
2030                 if (!push_all && !is_null_sha1(ref->old_sha1)) {
2031                         old_sha1_hex = xmalloc(42);
2032                         sprintf(old_sha1_hex, "^%s",
2033                                 sha1_to_hex(ref->old_sha1));
2034                         commit_argv[3] = old_sha1_hex;
2035                         commit_argc++;
2036                 }
2037                 commit_argv[commit_argc] = NULL;
2038                 init_revisions(&revs, setup_git_directory());
2039                 setup_revisions(commit_argc, commit_argv, &revs, NULL);
2040                 revs.edge_hint = 0; /* just in case */
2041                 free(new_sha1_hex);
2042                 if (old_sha1_hex) {
2043                         free(old_sha1_hex);
2044                         commit_argv[1] = NULL;
2045                 }
2046
2047                 /* Generate a list of objects that need to be pushed */
2048                 pushing = 0;
2049                 if (prepare_revision_walk(&revs))
2050                         die("revision walk setup failed");
2051                 mark_edges_uninteresting(revs.commits, &revs, NULL);
2052                 objects_to_send = get_delta(&revs, ref_lock);
2053                 finish_all_active_slots();
2054
2055                 /* Push missing objects to remote, this would be a
2056                    convenient time to pack them first if appropriate. */
2057                 pushing = 1;
2058                 if (objects_to_send)
2059                         fprintf(stderr, "    sending %d objects\n",
2060                                 objects_to_send);
2061
2062                 run_request_queue();
2063
2064                 /* Update the remote branch if all went well */
2065                 if (aborted || !update_remote(ref->new_sha1, ref_lock))
2066                         rc = 1;
2067
2068                 if (!rc)
2069                         fprintf(stderr, "    done\n");
2070                 if (helper_status)
2071                         printf("%s %s\n", !rc ? "ok" : "error", ref->name);
2072                 unlock_remote(ref_lock);
2073                 check_locks();
2074         }
2075
2076         /* Update remote server info if appropriate */
2077         if (repo->has_info_refs && new_refs) {
2078                 if (info_ref_lock && repo->can_update_info_refs) {
2079                         fprintf(stderr, "Updating remote server info\n");
2080                         if (!dry_run)
2081                                 update_remote_info_refs(info_ref_lock);
2082                 } else {
2083                         fprintf(stderr, "Unable to update server info\n");
2084                 }
2085         }
2086
2087  cleanup:
2088         if (info_ref_lock)
2089                 unlock_remote(info_ref_lock);
2090         free(repo);
2091
2092         http_cleanup();
2093
2094         request = request_queue_head;
2095         while (request != NULL) {
2096                 next_request = request->next;
2097                 release_request(request);
2098                 request = next_request;
2099         }
2100
2101         return rc;
2102 }