Merge branch 'ew/http-backend-batch-headers'
[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 #include "argv-array.h"
14
15 #ifdef EXPAT_NEEDS_XMLPARSE_H
16 #include <xmlparse.h>
17 #else
18 #include <expat.h>
19 #endif
20
21 static const char http_push_usage[] =
22 "git http-push [--all] [--dry-run] [--force] [--verbose] <remote> [<head>...]\n";
23
24 #ifndef XML_STATUS_OK
25 enum XML_Status {
26   XML_STATUS_OK = 1,
27   XML_STATUS_ERROR = 0
28 };
29 #define XML_STATUS_OK    1
30 #define XML_STATUS_ERROR 0
31 #endif
32
33 #define PREV_BUF_SIZE 4096
34
35 /* DAV methods */
36 #define DAV_LOCK "LOCK"
37 #define DAV_MKCOL "MKCOL"
38 #define DAV_MOVE "MOVE"
39 #define DAV_PROPFIND "PROPFIND"
40 #define DAV_PUT "PUT"
41 #define DAV_UNLOCK "UNLOCK"
42 #define DAV_DELETE "DELETE"
43
44 /* DAV lock flags */
45 #define DAV_PROP_LOCKWR (1u << 0)
46 #define DAV_PROP_LOCKEX (1u << 1)
47 #define DAV_LOCK_OK (1u << 2)
48
49 /* DAV XML properties */
50 #define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
51 #define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
52 #define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
53 #define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
54 #define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
55 #define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
56 #define DAV_PROPFIND_RESP ".multistatus.response"
57 #define DAV_PROPFIND_NAME ".multistatus.response.href"
58 #define DAV_PROPFIND_COLLECTION ".multistatus.response.propstat.prop.resourcetype.collection"
59
60 /* DAV request body templates */
61 #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>"
62 #define PROPFIND_ALL_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/>\n</D:propfind>"
63 #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>"
64
65 #define LOCK_TIME 600
66 #define LOCK_REFRESH 30
67
68 /* Remember to update object flag allocation in object.h */
69 #define LOCAL    (1u<<16)
70 #define REMOTE   (1u<<17)
71 #define FETCHING (1u<<18)
72 #define PUSHING  (1u<<19)
73
74 /* We allow "recursive" symbolic refs. Only within reason, though */
75 #define MAXDEPTH 5
76
77 static int pushing;
78 static int aborted;
79 static signed char remote_dir_exists[256];
80
81 static int push_verbosely;
82 static int push_all = MATCH_REFS_NONE;
83 static int force_all;
84 static int dry_run;
85 static int helper_status;
86
87 static struct object_list *objects;
88
89 struct repo {
90         char *url;
91         char *path;
92         int path_len;
93         int has_info_refs;
94         int can_update_info_refs;
95         int has_info_packs;
96         struct packed_git *packs;
97         struct remote_lock *locks;
98 };
99
100 static struct repo *repo;
101
102 enum transfer_state {
103         NEED_FETCH,
104         RUN_FETCH_LOOSE,
105         RUN_FETCH_PACKED,
106         NEED_PUSH,
107         RUN_MKCOL,
108         RUN_PUT,
109         RUN_MOVE,
110         ABORTED,
111         COMPLETE
112 };
113
114 struct transfer_request {
115         struct object *obj;
116         char *url;
117         char *dest;
118         struct remote_lock *lock;
119         struct curl_slist *headers;
120         struct buffer buffer;
121         enum transfer_state state;
122         CURLcode curl_result;
123         char errorstr[CURL_ERROR_SIZE];
124         long http_code;
125         void *userData;
126         struct active_request_slot *slot;
127         struct transfer_request *next;
128 };
129
130 static struct transfer_request *request_queue_head;
131
132 struct xml_ctx {
133         char *name;
134         int len;
135         char *cdata;
136         void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
137         void *userData;
138 };
139
140 struct remote_lock {
141         char *url;
142         char *owner;
143         char *token;
144         char tmpfile_suffix[41];
145         time_t start_time;
146         long timeout;
147         int refreshing;
148         struct remote_lock *next;
149 };
150
151 /* Flags that control remote_ls processing */
152 #define PROCESS_FILES (1u << 0)
153 #define PROCESS_DIRS  (1u << 1)
154 #define RECURSIVE     (1u << 2)
155
156 /* Flags that remote_ls passes to callback functions */
157 #define IS_DIR (1u << 0)
158
159 struct remote_ls_ctx {
160         char *path;
161         void (*userFunc)(struct remote_ls_ctx *ls);
162         void *userData;
163         int flags;
164         char *dentry_name;
165         int dentry_flags;
166         struct remote_ls_ctx *parent;
167 };
168
169 /* get_dav_token_headers options */
170 enum dav_header_flag {
171         DAV_HEADER_IF = (1u << 0),
172         DAV_HEADER_LOCK = (1u << 1),
173         DAV_HEADER_TIMEOUT = (1u << 2)
174 };
175
176 static char *xml_entities(const char *s)
177 {
178         struct strbuf buf = STRBUF_INIT;
179         strbuf_addstr_xml_quoted(&buf, s);
180         return strbuf_detach(&buf, NULL);
181 }
182
183 static void curl_setup_http_get(CURL *curl, const char *url,
184                 const char *custom_req)
185 {
186         curl_easy_setopt(curl, CURLOPT_HTTPGET, 1);
187         curl_easy_setopt(curl, CURLOPT_URL, url);
188         curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, custom_req);
189         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_null);
190 }
191
192 static void curl_setup_http(CURL *curl, const char *url,
193                 const char *custom_req, struct buffer *buffer,
194                 curl_write_callback write_fn)
195 {
196         curl_easy_setopt(curl, CURLOPT_PUT, 1);
197         curl_easy_setopt(curl, CURLOPT_URL, url);
198         curl_easy_setopt(curl, CURLOPT_INFILE, buffer);
199         curl_easy_setopt(curl, CURLOPT_INFILESIZE, buffer->buf.len);
200         curl_easy_setopt(curl, CURLOPT_READFUNCTION, fread_buffer);
201 #ifndef NO_CURL_IOCTL
202         curl_easy_setopt(curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
203         curl_easy_setopt(curl, CURLOPT_IOCTLDATA, buffer);
204 #endif
205         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_fn);
206         curl_easy_setopt(curl, CURLOPT_NOBODY, 0);
207         curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, custom_req);
208         curl_easy_setopt(curl, CURLOPT_UPLOAD, 1);
209 }
210
211 static struct curl_slist *get_dav_token_headers(struct remote_lock *lock, enum dav_header_flag options)
212 {
213         struct strbuf buf = STRBUF_INIT;
214         struct curl_slist *dav_headers = http_copy_default_headers();
215
216         if (options & DAV_HEADER_IF) {
217                 strbuf_addf(&buf, "If: (<%s>)", lock->token);
218                 dav_headers = curl_slist_append(dav_headers, buf.buf);
219                 strbuf_reset(&buf);
220         }
221         if (options & DAV_HEADER_LOCK) {
222                 strbuf_addf(&buf, "Lock-Token: <%s>", lock->token);
223                 dav_headers = curl_slist_append(dav_headers, buf.buf);
224                 strbuf_reset(&buf);
225         }
226         if (options & DAV_HEADER_TIMEOUT) {
227                 strbuf_addf(&buf, "Timeout: Second-%ld", lock->timeout);
228                 dav_headers = curl_slist_append(dav_headers, buf.buf);
229                 strbuf_reset(&buf);
230         }
231         strbuf_release(&buf);
232
233         return dav_headers;
234 }
235
236 static void finish_request(struct transfer_request *request);
237 static void release_request(struct transfer_request *request);
238
239 static void process_response(void *callback_data)
240 {
241         struct transfer_request *request =
242                 (struct transfer_request *)callback_data;
243
244         finish_request(request);
245 }
246
247 #ifdef USE_CURL_MULTI
248
249 static void start_fetch_loose(struct transfer_request *request)
250 {
251         struct active_request_slot *slot;
252         struct http_object_request *obj_req;
253
254         obj_req = new_http_object_request(repo->url, request->obj->oid.hash);
255         if (obj_req == NULL) {
256                 request->state = ABORTED;
257                 return;
258         }
259
260         slot = obj_req->slot;
261         slot->callback_func = process_response;
262         slot->callback_data = request;
263         request->slot = slot;
264         request->userData = obj_req;
265
266         /* Try to get the request started, abort the request on error */
267         request->state = RUN_FETCH_LOOSE;
268         if (!start_active_slot(slot)) {
269                 fprintf(stderr, "Unable to start GET request\n");
270                 repo->can_update_info_refs = 0;
271                 release_http_object_request(obj_req);
272                 release_request(request);
273         }
274 }
275
276 static void start_mkcol(struct transfer_request *request)
277 {
278         char *hex = oid_to_hex(&request->obj->oid);
279         struct active_request_slot *slot;
280
281         request->url = get_remote_object_url(repo->url, hex, 1);
282
283         slot = get_active_slot();
284         slot->callback_func = process_response;
285         slot->callback_data = request;
286         curl_setup_http_get(slot->curl, request->url, DAV_MKCOL);
287         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
288
289         if (start_active_slot(slot)) {
290                 request->slot = slot;
291                 request->state = RUN_MKCOL;
292         } else {
293                 request->state = ABORTED;
294                 free(request->url);
295                 request->url = NULL;
296         }
297 }
298 #endif
299
300 static void start_fetch_packed(struct transfer_request *request)
301 {
302         struct packed_git *target;
303
304         struct transfer_request *check_request = request_queue_head;
305         struct http_pack_request *preq;
306
307         target = find_sha1_pack(request->obj->oid.hash, repo->packs);
308         if (!target) {
309                 fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", oid_to_hex(&request->obj->oid));
310                 repo->can_update_info_refs = 0;
311                 release_request(request);
312                 return;
313         }
314
315         fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
316         fprintf(stderr, " which contains %s\n", oid_to_hex(&request->obj->oid));
317
318         preq = new_http_pack_request(target, repo->url);
319         if (preq == NULL) {
320                 repo->can_update_info_refs = 0;
321                 return;
322         }
323         preq->lst = &repo->packs;
324
325         /* Make sure there isn't another open request for this pack */
326         while (check_request) {
327                 if (check_request->state == RUN_FETCH_PACKED &&
328                     !strcmp(check_request->url, preq->url)) {
329                         release_http_pack_request(preq);
330                         release_request(request);
331                         return;
332                 }
333                 check_request = check_request->next;
334         }
335
336         preq->slot->callback_func = process_response;
337         preq->slot->callback_data = request;
338         request->slot = preq->slot;
339         request->userData = preq;
340
341         /* Try to get the request started, abort the request on error */
342         request->state = RUN_FETCH_PACKED;
343         if (!start_active_slot(preq->slot)) {
344                 fprintf(stderr, "Unable to start GET request\n");
345                 release_http_pack_request(preq);
346                 repo->can_update_info_refs = 0;
347                 release_request(request);
348         }
349 }
350
351 static void start_put(struct transfer_request *request)
352 {
353         char *hex = oid_to_hex(&request->obj->oid);
354         struct active_request_slot *slot;
355         struct strbuf buf = STRBUF_INIT;
356         enum object_type type;
357         char hdr[50];
358         void *unpacked;
359         unsigned long len;
360         int hdrlen;
361         ssize_t size;
362         git_zstream stream;
363
364         unpacked = read_sha1_file(request->obj->oid.hash, &type, &len);
365         hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(type), len) + 1;
366
367         /* Set it up */
368         git_deflate_init(&stream, zlib_compression_level);
369         size = git_deflate_bound(&stream, len + hdrlen);
370         strbuf_init(&request->buffer.buf, size);
371         request->buffer.posn = 0;
372
373         /* Compress it */
374         stream.next_out = (unsigned char *)request->buffer.buf.buf;
375         stream.avail_out = size;
376
377         /* First header.. */
378         stream.next_in = (void *)hdr;
379         stream.avail_in = hdrlen;
380         while (git_deflate(&stream, 0) == Z_OK)
381                 ; /* nothing */
382
383         /* Then the data itself.. */
384         stream.next_in = unpacked;
385         stream.avail_in = len;
386         while (git_deflate(&stream, Z_FINISH) == Z_OK)
387                 ; /* nothing */
388         git_deflate_end(&stream);
389         free(unpacked);
390
391         request->buffer.buf.len = stream.total_out;
392
393         strbuf_addstr(&buf, "Destination: ");
394         append_remote_object_url(&buf, repo->url, hex, 0);
395         request->dest = strbuf_detach(&buf, NULL);
396
397         append_remote_object_url(&buf, repo->url, hex, 0);
398         strbuf_add(&buf, request->lock->tmpfile_suffix, 41);
399         request->url = strbuf_detach(&buf, NULL);
400
401         slot = get_active_slot();
402         slot->callback_func = process_response;
403         slot->callback_data = request;
404         curl_setup_http(slot->curl, request->url, DAV_PUT,
405                         &request->buffer, fwrite_null);
406
407         if (start_active_slot(slot)) {
408                 request->slot = slot;
409                 request->state = RUN_PUT;
410         } else {
411                 request->state = ABORTED;
412                 free(request->url);
413                 request->url = NULL;
414         }
415 }
416
417 static void start_move(struct transfer_request *request)
418 {
419         struct active_request_slot *slot;
420         struct curl_slist *dav_headers = http_copy_default_headers();
421
422         slot = get_active_slot();
423         slot->callback_func = process_response;
424         slot->callback_data = request;
425         curl_setup_http_get(slot->curl, request->url, DAV_MOVE);
426         dav_headers = curl_slist_append(dav_headers, request->dest);
427         dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
428         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
429
430         if (start_active_slot(slot)) {
431                 request->slot = slot;
432                 request->state = RUN_MOVE;
433         } else {
434                 request->state = ABORTED;
435                 free(request->url);
436                 request->url = NULL;
437         }
438 }
439
440 static int refresh_lock(struct remote_lock *lock)
441 {
442         struct active_request_slot *slot;
443         struct slot_results results;
444         struct curl_slist *dav_headers;
445         int rc = 0;
446
447         lock->refreshing = 1;
448
449         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF | DAV_HEADER_TIMEOUT);
450
451         slot = get_active_slot();
452         slot->results = &results;
453         curl_setup_http_get(slot->curl, lock->url, DAV_LOCK);
454         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
455
456         if (start_active_slot(slot)) {
457                 run_active_slot(slot);
458                 if (results.curl_result != CURLE_OK) {
459                         fprintf(stderr, "LOCK HTTP error %ld\n",
460                                 results.http_code);
461                 } else {
462                         lock->start_time = time(NULL);
463                         rc = 1;
464                 }
465         }
466
467         lock->refreshing = 0;
468         curl_slist_free_all(dav_headers);
469
470         return rc;
471 }
472
473 static void check_locks(void)
474 {
475         struct remote_lock *lock = repo->locks;
476         time_t current_time = time(NULL);
477         int time_remaining;
478
479         while (lock) {
480                 time_remaining = lock->start_time + lock->timeout -
481                         current_time;
482                 if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
483                         if (!refresh_lock(lock)) {
484                                 fprintf(stderr,
485                                         "Unable to refresh lock for %s\n",
486                                         lock->url);
487                                 aborted = 1;
488                                 return;
489                         }
490                 }
491                 lock = lock->next;
492         }
493 }
494
495 static void release_request(struct transfer_request *request)
496 {
497         struct transfer_request *entry = request_queue_head;
498
499         if (request == request_queue_head) {
500                 request_queue_head = request->next;
501         } else {
502                 while (entry->next != NULL && entry->next != request)
503                         entry = entry->next;
504                 if (entry->next == request)
505                         entry->next = entry->next->next;
506         }
507
508         free(request->url);
509         free(request);
510 }
511
512 static void finish_request(struct transfer_request *request)
513 {
514         struct http_pack_request *preq;
515         struct http_object_request *obj_req;
516
517         request->curl_result = request->slot->curl_result;
518         request->http_code = request->slot->http_code;
519         request->slot = NULL;
520
521         /* Keep locks active */
522         check_locks();
523
524         if (request->headers != NULL)
525                 curl_slist_free_all(request->headers);
526
527         /* URL is reused for MOVE after PUT */
528         if (request->state != RUN_PUT) {
529                 free(request->url);
530                 request->url = NULL;
531         }
532
533         if (request->state == RUN_MKCOL) {
534                 if (request->curl_result == CURLE_OK ||
535                     request->http_code == 405) {
536                         remote_dir_exists[request->obj->oid.hash[0]] = 1;
537                         start_put(request);
538                 } else {
539                         fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
540                                 oid_to_hex(&request->obj->oid),
541                                 request->curl_result, request->http_code);
542                         request->state = ABORTED;
543                         aborted = 1;
544                 }
545         } else if (request->state == RUN_PUT) {
546                 if (request->curl_result == CURLE_OK) {
547                         start_move(request);
548                 } else {
549                         fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
550                                 oid_to_hex(&request->obj->oid),
551                                 request->curl_result, request->http_code);
552                         request->state = ABORTED;
553                         aborted = 1;
554                 }
555         } else if (request->state == RUN_MOVE) {
556                 if (request->curl_result == CURLE_OK) {
557                         if (push_verbosely)
558                                 fprintf(stderr, "    sent %s\n",
559                                         oid_to_hex(&request->obj->oid));
560                         request->obj->flags |= REMOTE;
561                         release_request(request);
562                 } else {
563                         fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
564                                 oid_to_hex(&request->obj->oid),
565                                 request->curl_result, request->http_code);
566                         request->state = ABORTED;
567                         aborted = 1;
568                 }
569         } else if (request->state == RUN_FETCH_LOOSE) {
570                 obj_req = (struct http_object_request *)request->userData;
571
572                 if (finish_http_object_request(obj_req) == 0)
573                         if (obj_req->rename == 0)
574                                 request->obj->flags |= (LOCAL | REMOTE);
575
576                 /* Try fetching packed if necessary */
577                 if (request->obj->flags & LOCAL) {
578                         release_http_object_request(obj_req);
579                         release_request(request);
580                 } else
581                         start_fetch_packed(request);
582
583         } else if (request->state == RUN_FETCH_PACKED) {
584                 int fail = 1;
585                 if (request->curl_result != CURLE_OK) {
586                         fprintf(stderr, "Unable to get pack file %s\n%s",
587                                 request->url, curl_errorstr);
588                 } else {
589                         preq = (struct http_pack_request *)request->userData;
590
591                         if (preq) {
592                                 if (finish_http_pack_request(preq) == 0)
593                                         fail = 0;
594                                 release_http_pack_request(preq);
595                         }
596                 }
597                 if (fail)
598                         repo->can_update_info_refs = 0;
599                 release_request(request);
600         }
601 }
602
603 #ifdef USE_CURL_MULTI
604 static int is_running_queue;
605 static int fill_active_slot(void *unused)
606 {
607         struct transfer_request *request;
608
609         if (aborted || !is_running_queue)
610                 return 0;
611
612         for (request = request_queue_head; request; request = request->next) {
613                 if (request->state == NEED_FETCH) {
614                         start_fetch_loose(request);
615                         return 1;
616                 } else if (pushing && request->state == NEED_PUSH) {
617                         if (remote_dir_exists[request->obj->oid.hash[0]] == 1) {
618                                 start_put(request);
619                         } else {
620                                 start_mkcol(request);
621                         }
622                         return 1;
623                 }
624         }
625         return 0;
626 }
627 #endif
628
629 static void get_remote_object_list(unsigned char parent);
630
631 static void add_fetch_request(struct object *obj)
632 {
633         struct transfer_request *request;
634
635         check_locks();
636
637         /*
638          * Don't fetch the object if it's known to exist locally
639          * or is already in the request queue
640          */
641         if (remote_dir_exists[obj->oid.hash[0]] == -1)
642                 get_remote_object_list(obj->oid.hash[0]);
643         if (obj->flags & (LOCAL | FETCHING))
644                 return;
645
646         obj->flags |= FETCHING;
647         request = xmalloc(sizeof(*request));
648         request->obj = obj;
649         request->url = NULL;
650         request->lock = NULL;
651         request->headers = NULL;
652         request->state = NEED_FETCH;
653         request->next = request_queue_head;
654         request_queue_head = request;
655
656 #ifdef USE_CURL_MULTI
657         fill_active_slots();
658         step_active_slots();
659 #endif
660 }
661
662 static int add_send_request(struct object *obj, struct remote_lock *lock)
663 {
664         struct transfer_request *request;
665         struct packed_git *target;
666
667         /* Keep locks active */
668         check_locks();
669
670         /*
671          * Don't push the object if it's known to exist on the remote
672          * or is already in the request queue
673          */
674         if (remote_dir_exists[obj->oid.hash[0]] == -1)
675                 get_remote_object_list(obj->oid.hash[0]);
676         if (obj->flags & (REMOTE | PUSHING))
677                 return 0;
678         target = find_sha1_pack(obj->oid.hash, repo->packs);
679         if (target) {
680                 obj->flags |= REMOTE;
681                 return 0;
682         }
683
684         obj->flags |= PUSHING;
685         request = xmalloc(sizeof(*request));
686         request->obj = obj;
687         request->url = NULL;
688         request->lock = lock;
689         request->headers = NULL;
690         request->state = NEED_PUSH;
691         request->next = request_queue_head;
692         request_queue_head = request;
693
694 #ifdef USE_CURL_MULTI
695         fill_active_slots();
696         step_active_slots();
697 #endif
698
699         return 1;
700 }
701
702 static int fetch_indices(void)
703 {
704         int ret;
705
706         if (push_verbosely)
707                 fprintf(stderr, "Getting pack list\n");
708
709         switch (http_get_info_packs(repo->url, &repo->packs)) {
710         case HTTP_OK:
711         case HTTP_MISSING_TARGET:
712                 ret = 0;
713                 break;
714         default:
715                 ret = -1;
716         }
717
718         return ret;
719 }
720
721 static void one_remote_object(const unsigned char *sha1)
722 {
723         struct object *obj;
724
725         obj = lookup_object(sha1);
726         if (!obj)
727                 obj = parse_object(sha1);
728
729         /* Ignore remote objects that don't exist locally */
730         if (!obj)
731                 return;
732
733         obj->flags |= REMOTE;
734         if (!object_list_contains(objects, obj))
735                 object_list_insert(obj, &objects);
736 }
737
738 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
739 {
740         int *lock_flags = (int *)ctx->userData;
741
742         if (tag_closed) {
743                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
744                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
745                             (*lock_flags & DAV_PROP_LOCKWR)) {
746                                 *lock_flags |= DAV_LOCK_OK;
747                         }
748                         *lock_flags &= DAV_LOCK_OK;
749                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
750                         *lock_flags |= DAV_PROP_LOCKWR;
751                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
752                         *lock_flags |= DAV_PROP_LOCKEX;
753                 }
754         }
755 }
756
757 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
758 {
759         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
760         git_SHA_CTX sha_ctx;
761         unsigned char lock_token_sha1[20];
762
763         if (tag_closed && ctx->cdata) {
764                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
765                         lock->owner = xstrdup(ctx->cdata);
766                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
767                         const char *arg;
768                         if (skip_prefix(ctx->cdata, "Second-", &arg))
769                                 lock->timeout = strtol(arg, NULL, 10);
770                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
771                         lock->token = xstrdup(ctx->cdata);
772
773                         git_SHA1_Init(&sha_ctx);
774                         git_SHA1_Update(&sha_ctx, lock->token, strlen(lock->token));
775                         git_SHA1_Final(lock_token_sha1, &sha_ctx);
776
777                         lock->tmpfile_suffix[0] = '_';
778                         memcpy(lock->tmpfile_suffix + 1, sha1_to_hex(lock_token_sha1), 40);
779                 }
780         }
781 }
782
783 static void one_remote_ref(const char *refname);
784
785 static void
786 xml_start_tag(void *userData, const char *name, const char **atts)
787 {
788         struct xml_ctx *ctx = (struct xml_ctx *)userData;
789         const char *c = strchr(name, ':');
790         int old_namelen, new_len;
791
792         if (c == NULL)
793                 c = name;
794         else
795                 c++;
796
797         old_namelen = strlen(ctx->name);
798         new_len = old_namelen + strlen(c) + 2;
799
800         if (new_len > ctx->len) {
801                 ctx->name = xrealloc(ctx->name, new_len);
802                 ctx->len = new_len;
803         }
804         xsnprintf(ctx->name + old_namelen, ctx->len - old_namelen, ".%s", c);
805
806         free(ctx->cdata);
807         ctx->cdata = NULL;
808
809         ctx->userFunc(ctx, 0);
810 }
811
812 static void
813 xml_end_tag(void *userData, const char *name)
814 {
815         struct xml_ctx *ctx = (struct xml_ctx *)userData;
816         const char *c = strchr(name, ':');
817         char *ep;
818
819         ctx->userFunc(ctx, 1);
820
821         if (c == NULL)
822                 c = name;
823         else
824                 c++;
825
826         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
827         *ep = 0;
828 }
829
830 static void
831 xml_cdata(void *userData, const XML_Char *s, int len)
832 {
833         struct xml_ctx *ctx = (struct xml_ctx *)userData;
834         free(ctx->cdata);
835         ctx->cdata = xmemdupz(s, len);
836 }
837
838 static struct remote_lock *lock_remote(const char *path, long timeout)
839 {
840         struct active_request_slot *slot;
841         struct slot_results results;
842         struct buffer out_buffer = { STRBUF_INIT, 0 };
843         struct strbuf in_buffer = STRBUF_INIT;
844         char *url;
845         char *ep;
846         char timeout_header[25];
847         struct remote_lock *lock = NULL;
848         struct curl_slist *dav_headers = http_copy_default_headers();
849         struct xml_ctx ctx;
850         char *escaped;
851
852         url = xstrfmt("%s%s", repo->url, path);
853
854         /* Make sure leading directories exist for the remote ref */
855         ep = strchr(url + strlen(repo->url) + 1, '/');
856         while (ep) {
857                 char saved_character = ep[1];
858                 ep[1] = '\0';
859                 slot = get_active_slot();
860                 slot->results = &results;
861                 curl_setup_http_get(slot->curl, url, DAV_MKCOL);
862                 if (start_active_slot(slot)) {
863                         run_active_slot(slot);
864                         if (results.curl_result != CURLE_OK &&
865                             results.http_code != 405) {
866                                 fprintf(stderr,
867                                         "Unable to create branch path %s\n",
868                                         url);
869                                 free(url);
870                                 return NULL;
871                         }
872                 } else {
873                         fprintf(stderr, "Unable to start MKCOL request\n");
874                         free(url);
875                         return NULL;
876                 }
877                 ep[1] = saved_character;
878                 ep = strchr(ep + 1, '/');
879         }
880
881         escaped = xml_entities(ident_default_email());
882         strbuf_addf(&out_buffer.buf, LOCK_REQUEST, escaped);
883         free(escaped);
884
885         xsnprintf(timeout_header, sizeof(timeout_header), "Timeout: Second-%ld", timeout);
886         dav_headers = curl_slist_append(dav_headers, timeout_header);
887         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
888
889         slot = get_active_slot();
890         slot->results = &results;
891         curl_setup_http(slot->curl, url, DAV_LOCK, &out_buffer, fwrite_buffer);
892         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
893         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
894
895         lock = xcalloc(1, sizeof(*lock));
896         lock->timeout = -1;
897
898         if (start_active_slot(slot)) {
899                 run_active_slot(slot);
900                 if (results.curl_result == CURLE_OK) {
901                         XML_Parser parser = XML_ParserCreate(NULL);
902                         enum XML_Status result;
903                         ctx.name = xcalloc(10, 1);
904                         ctx.len = 0;
905                         ctx.cdata = NULL;
906                         ctx.userFunc = handle_new_lock_ctx;
907                         ctx.userData = lock;
908                         XML_SetUserData(parser, &ctx);
909                         XML_SetElementHandler(parser, xml_start_tag,
910                                               xml_end_tag);
911                         XML_SetCharacterDataHandler(parser, xml_cdata);
912                         result = XML_Parse(parser, in_buffer.buf,
913                                            in_buffer.len, 1);
914                         free(ctx.name);
915                         if (result != XML_STATUS_OK) {
916                                 fprintf(stderr, "XML error: %s\n",
917                                         XML_ErrorString(
918                                                 XML_GetErrorCode(parser)));
919                                 lock->timeout = -1;
920                         }
921                         XML_ParserFree(parser);
922                 }
923         } else {
924                 fprintf(stderr, "Unable to start LOCK request\n");
925         }
926
927         curl_slist_free_all(dav_headers);
928         strbuf_release(&out_buffer.buf);
929         strbuf_release(&in_buffer);
930
931         if (lock->token == NULL || lock->timeout <= 0) {
932                 free(lock->token);
933                 free(lock->owner);
934                 free(url);
935                 free(lock);
936                 lock = NULL;
937         } else {
938                 lock->url = url;
939                 lock->start_time = time(NULL);
940                 lock->next = repo->locks;
941                 repo->locks = lock;
942         }
943
944         return lock;
945 }
946
947 static int unlock_remote(struct remote_lock *lock)
948 {
949         struct active_request_slot *slot;
950         struct slot_results results;
951         struct remote_lock *prev = repo->locks;
952         struct curl_slist *dav_headers;
953         int rc = 0;
954
955         dav_headers = get_dav_token_headers(lock, DAV_HEADER_LOCK);
956
957         slot = get_active_slot();
958         slot->results = &results;
959         curl_setup_http_get(slot->curl, lock->url, DAV_UNLOCK);
960         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
961
962         if (start_active_slot(slot)) {
963                 run_active_slot(slot);
964                 if (results.curl_result == CURLE_OK)
965                         rc = 1;
966                 else
967                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
968                                 results.http_code);
969         } else {
970                 fprintf(stderr, "Unable to start UNLOCK request\n");
971         }
972
973         curl_slist_free_all(dav_headers);
974
975         if (repo->locks == lock) {
976                 repo->locks = lock->next;
977         } else {
978                 while (prev && prev->next != lock)
979                         prev = prev->next;
980                 if (prev)
981                         prev->next = prev->next->next;
982         }
983
984         free(lock->owner);
985         free(lock->url);
986         free(lock->token);
987         free(lock);
988
989         return rc;
990 }
991
992 static void remove_locks(void)
993 {
994         struct remote_lock *lock = repo->locks;
995
996         fprintf(stderr, "Removing remote locks...\n");
997         while (lock) {
998                 struct remote_lock *next = lock->next;
999                 unlock_remote(lock);
1000                 lock = next;
1001         }
1002 }
1003
1004 static void remove_locks_on_signal(int signo)
1005 {
1006         remove_locks();
1007         sigchain_pop(signo);
1008         raise(signo);
1009 }
1010
1011 static void remote_ls(const char *path, int flags,
1012                       void (*userFunc)(struct remote_ls_ctx *ls),
1013                       void *userData);
1014
1015 /* extract hex from sharded "xx/x{40}" filename */
1016 static int get_sha1_hex_from_objpath(const char *path, unsigned char *sha1)
1017 {
1018         char hex[40];
1019
1020         if (strlen(path) != 41)
1021                 return -1;
1022
1023         memcpy(hex, path, 2);
1024         path += 2;
1025         path++; /* skip '/' */
1026         memcpy(hex, path, 38);
1027
1028         return get_sha1_hex(hex, sha1);
1029 }
1030
1031 static void process_ls_object(struct remote_ls_ctx *ls)
1032 {
1033         unsigned int *parent = (unsigned int *)ls->userData;
1034         const char *path = ls->dentry_name;
1035         unsigned char sha1[20];
1036
1037         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1038                 remote_dir_exists[*parent] = 1;
1039                 return;
1040         }
1041
1042         if (!skip_prefix(path, "objects/", &path) ||
1043             get_sha1_hex_from_objpath(path, sha1))
1044                 return;
1045
1046         one_remote_object(sha1);
1047 }
1048
1049 static void process_ls_ref(struct remote_ls_ctx *ls)
1050 {
1051         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1052                 fprintf(stderr, "  %s\n", ls->dentry_name);
1053                 return;
1054         }
1055
1056         if (!(ls->dentry_flags & IS_DIR))
1057                 one_remote_ref(ls->dentry_name);
1058 }
1059
1060 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1061 {
1062         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1063
1064         if (tag_closed) {
1065                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1066                         if (ls->dentry_flags & IS_DIR) {
1067
1068                                 /* ensure collection names end with slash */
1069                                 str_end_url_with_slash(ls->dentry_name, &ls->dentry_name);
1070
1071                                 if (ls->flags & PROCESS_DIRS) {
1072                                         ls->userFunc(ls);
1073                                 }
1074                                 if (strcmp(ls->dentry_name, ls->path) &&
1075                                     ls->flags & RECURSIVE) {
1076                                         remote_ls(ls->dentry_name,
1077                                                   ls->flags,
1078                                                   ls->userFunc,
1079                                                   ls->userData);
1080                                 }
1081                         } else if (ls->flags & PROCESS_FILES) {
1082                                 ls->userFunc(ls);
1083                         }
1084                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1085                         char *path = ctx->cdata;
1086                         if (*ctx->cdata == 'h') {
1087                                 path = strstr(path, "//");
1088                                 if (path) {
1089                                         path = strchr(path+2, '/');
1090                                 }
1091                         }
1092                         if (path) {
1093                                 const char *url = repo->url;
1094                                 if (repo->path)
1095                                         url = repo->path;
1096                                 if (strncmp(path, url, repo->path_len))
1097                                         error("Parsed path '%s' does not match url: '%s'",
1098                                               path, url);
1099                                 else {
1100                                         path += repo->path_len;
1101                                         ls->dentry_name = xstrdup(path);
1102                                 }
1103                         }
1104                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1105                         ls->dentry_flags |= IS_DIR;
1106                 }
1107         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1108                 free(ls->dentry_name);
1109                 ls->dentry_name = NULL;
1110                 ls->dentry_flags = 0;
1111         }
1112 }
1113
1114 /*
1115  * NEEDSWORK: remote_ls() ignores info/refs on the remote side.  But it
1116  * should _only_ heed the information from that file, instead of trying to
1117  * determine the refs from the remote file system (badly: it does not even
1118  * know about packed-refs).
1119  */
1120 static void remote_ls(const char *path, int flags,
1121                       void (*userFunc)(struct remote_ls_ctx *ls),
1122                       void *userData)
1123 {
1124         char *url = xstrfmt("%s%s", repo->url, path);
1125         struct active_request_slot *slot;
1126         struct slot_results results;
1127         struct strbuf in_buffer = STRBUF_INIT;
1128         struct buffer out_buffer = { STRBUF_INIT, 0 };
1129         struct curl_slist *dav_headers = http_copy_default_headers();
1130         struct xml_ctx ctx;
1131         struct remote_ls_ctx ls;
1132
1133         ls.flags = flags;
1134         ls.path = xstrdup(path);
1135         ls.dentry_name = NULL;
1136         ls.dentry_flags = 0;
1137         ls.userData = userData;
1138         ls.userFunc = userFunc;
1139
1140         strbuf_addstr(&out_buffer.buf, PROPFIND_ALL_REQUEST);
1141
1142         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1143         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1144
1145         slot = get_active_slot();
1146         slot->results = &results;
1147         curl_setup_http(slot->curl, url, DAV_PROPFIND,
1148                         &out_buffer, fwrite_buffer);
1149         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1150         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1151
1152         if (start_active_slot(slot)) {
1153                 run_active_slot(slot);
1154                 if (results.curl_result == CURLE_OK) {
1155                         XML_Parser parser = XML_ParserCreate(NULL);
1156                         enum XML_Status result;
1157                         ctx.name = xcalloc(10, 1);
1158                         ctx.len = 0;
1159                         ctx.cdata = NULL;
1160                         ctx.userFunc = handle_remote_ls_ctx;
1161                         ctx.userData = &ls;
1162                         XML_SetUserData(parser, &ctx);
1163                         XML_SetElementHandler(parser, xml_start_tag,
1164                                               xml_end_tag);
1165                         XML_SetCharacterDataHandler(parser, xml_cdata);
1166                         result = XML_Parse(parser, in_buffer.buf,
1167                                            in_buffer.len, 1);
1168                         free(ctx.name);
1169
1170                         if (result != XML_STATUS_OK) {
1171                                 fprintf(stderr, "XML error: %s\n",
1172                                         XML_ErrorString(
1173                                                 XML_GetErrorCode(parser)));
1174                         }
1175                         XML_ParserFree(parser);
1176                 }
1177         } else {
1178                 fprintf(stderr, "Unable to start PROPFIND request\n");
1179         }
1180
1181         free(ls.path);
1182         free(url);
1183         strbuf_release(&out_buffer.buf);
1184         strbuf_release(&in_buffer);
1185         curl_slist_free_all(dav_headers);
1186 }
1187
1188 static void get_remote_object_list(unsigned char parent)
1189 {
1190         char path[] = "objects/XX/";
1191         static const char hex[] = "0123456789abcdef";
1192         unsigned int val = parent;
1193
1194         path[8] = hex[val >> 4];
1195         path[9] = hex[val & 0xf];
1196         remote_dir_exists[val] = 0;
1197         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1198                   process_ls_object, &val);
1199 }
1200
1201 static int locking_available(void)
1202 {
1203         struct active_request_slot *slot;
1204         struct slot_results results;
1205         struct strbuf in_buffer = STRBUF_INIT;
1206         struct buffer out_buffer = { STRBUF_INIT, 0 };
1207         struct curl_slist *dav_headers = http_copy_default_headers();
1208         struct xml_ctx ctx;
1209         int lock_flags = 0;
1210         char *escaped;
1211
1212         escaped = xml_entities(repo->url);
1213         strbuf_addf(&out_buffer.buf, PROPFIND_SUPPORTEDLOCK_REQUEST, escaped);
1214         free(escaped);
1215
1216         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1217         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1218
1219         slot = get_active_slot();
1220         slot->results = &results;
1221         curl_setup_http(slot->curl, repo->url, DAV_PROPFIND,
1222                         &out_buffer, fwrite_buffer);
1223         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1224         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1225
1226         if (start_active_slot(slot)) {
1227                 run_active_slot(slot);
1228                 if (results.curl_result == CURLE_OK) {
1229                         XML_Parser parser = XML_ParserCreate(NULL);
1230                         enum XML_Status result;
1231                         ctx.name = xcalloc(10, 1);
1232                         ctx.len = 0;
1233                         ctx.cdata = NULL;
1234                         ctx.userFunc = handle_lockprop_ctx;
1235                         ctx.userData = &lock_flags;
1236                         XML_SetUserData(parser, &ctx);
1237                         XML_SetElementHandler(parser, xml_start_tag,
1238                                               xml_end_tag);
1239                         result = XML_Parse(parser, in_buffer.buf,
1240                                            in_buffer.len, 1);
1241                         free(ctx.name);
1242
1243                         if (result != XML_STATUS_OK) {
1244                                 fprintf(stderr, "XML error: %s\n",
1245                                         XML_ErrorString(
1246                                                 XML_GetErrorCode(parser)));
1247                                 lock_flags = 0;
1248                         }
1249                         XML_ParserFree(parser);
1250                         if (!lock_flags)
1251                                 error("no DAV locking support on %s",
1252                                       repo->url);
1253
1254                 } else {
1255                         error("Cannot access URL %s, return code %d",
1256                               repo->url, results.curl_result);
1257                         lock_flags = 0;
1258                 }
1259         } else {
1260                 error("Unable to start PROPFIND request on %s", repo->url);
1261         }
1262
1263         strbuf_release(&out_buffer.buf);
1264         strbuf_release(&in_buffer);
1265         curl_slist_free_all(dav_headers);
1266
1267         return lock_flags;
1268 }
1269
1270 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1271 {
1272         struct object_list *entry = xmalloc(sizeof(struct object_list));
1273         entry->item = obj;
1274         entry->next = *p;
1275         *p = entry;
1276         return &entry->next;
1277 }
1278
1279 static struct object_list **process_blob(struct blob *blob,
1280                                          struct object_list **p)
1281 {
1282         struct object *obj = &blob->object;
1283
1284         obj->flags |= LOCAL;
1285
1286         if (obj->flags & (UNINTERESTING | SEEN))
1287                 return p;
1288
1289         obj->flags |= SEEN;
1290         return add_one_object(obj, p);
1291 }
1292
1293 static struct object_list **process_tree(struct tree *tree,
1294                                          struct object_list **p)
1295 {
1296         struct object *obj = &tree->object;
1297         struct tree_desc desc;
1298         struct name_entry entry;
1299
1300         obj->flags |= LOCAL;
1301
1302         if (obj->flags & (UNINTERESTING | SEEN))
1303                 return p;
1304         if (parse_tree(tree) < 0)
1305                 die("bad tree object %s", oid_to_hex(&obj->oid));
1306
1307         obj->flags |= SEEN;
1308         p = add_one_object(obj, p);
1309
1310         init_tree_desc(&desc, tree->buffer, tree->size);
1311
1312         while (tree_entry(&desc, &entry))
1313                 switch (object_type(entry.mode)) {
1314                 case OBJ_TREE:
1315                         p = process_tree(lookup_tree(entry.oid->hash), p);
1316                         break;
1317                 case OBJ_BLOB:
1318                         p = process_blob(lookup_blob(entry.oid->hash), p);
1319                         break;
1320                 default:
1321                         /* Subproject commit - not in this repository */
1322                         break;
1323                 }
1324
1325         free_tree_buffer(tree);
1326         return p;
1327 }
1328
1329 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1330 {
1331         int i;
1332         struct commit *commit;
1333         struct object_list **p = &objects;
1334         int count = 0;
1335
1336         while ((commit = get_revision(revs)) != NULL) {
1337                 p = process_tree(commit->tree, p);
1338                 commit->object.flags |= LOCAL;
1339                 if (!(commit->object.flags & UNINTERESTING))
1340                         count += add_send_request(&commit->object, lock);
1341         }
1342
1343         for (i = 0; i < revs->pending.nr; i++) {
1344                 struct object_array_entry *entry = revs->pending.objects + i;
1345                 struct object *obj = entry->item;
1346                 const char *name = entry->name;
1347
1348                 if (obj->flags & (UNINTERESTING | SEEN))
1349                         continue;
1350                 if (obj->type == OBJ_TAG) {
1351                         obj->flags |= SEEN;
1352                         p = add_one_object(obj, p);
1353                         continue;
1354                 }
1355                 if (obj->type == OBJ_TREE) {
1356                         p = process_tree((struct tree *)obj, p);
1357                         continue;
1358                 }
1359                 if (obj->type == OBJ_BLOB) {
1360                         p = process_blob((struct blob *)obj, p);
1361                         continue;
1362                 }
1363                 die("unknown pending object %s (%s)", oid_to_hex(&obj->oid), name);
1364         }
1365
1366         while (objects) {
1367                 if (!(objects->item->flags & UNINTERESTING))
1368                         count += add_send_request(objects->item, lock);
1369                 objects = objects->next;
1370         }
1371
1372         return count;
1373 }
1374
1375 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1376 {
1377         struct active_request_slot *slot;
1378         struct slot_results results;
1379         struct buffer out_buffer = { STRBUF_INIT, 0 };
1380         struct curl_slist *dav_headers;
1381
1382         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1383
1384         strbuf_addf(&out_buffer.buf, "%s\n", sha1_to_hex(sha1));
1385
1386         slot = get_active_slot();
1387         slot->results = &results;
1388         curl_setup_http(slot->curl, lock->url, DAV_PUT,
1389                         &out_buffer, fwrite_null);
1390         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1391
1392         if (start_active_slot(slot)) {
1393                 run_active_slot(slot);
1394                 strbuf_release(&out_buffer.buf);
1395                 if (results.curl_result != CURLE_OK) {
1396                         fprintf(stderr,
1397                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1398                                 results.curl_result, results.http_code);
1399                         /* We should attempt recovery? */
1400                         return 0;
1401                 }
1402         } else {
1403                 strbuf_release(&out_buffer.buf);
1404                 fprintf(stderr, "Unable to start PUT request\n");
1405                 return 0;
1406         }
1407
1408         return 1;
1409 }
1410
1411 static struct ref *remote_refs;
1412
1413 static void one_remote_ref(const char *refname)
1414 {
1415         struct ref *ref;
1416         struct object *obj;
1417
1418         ref = alloc_ref(refname);
1419
1420         if (http_fetch_ref(repo->url, ref) != 0) {
1421                 fprintf(stderr,
1422                         "Unable to fetch ref %s from %s\n",
1423                         refname, repo->url);
1424                 free(ref);
1425                 return;
1426         }
1427
1428         /*
1429          * Fetch a copy of the object if it doesn't exist locally - it
1430          * may be required for updating server info later.
1431          */
1432         if (repo->can_update_info_refs && !has_object_file(&ref->old_oid)) {
1433                 obj = lookup_unknown_object(ref->old_oid.hash);
1434                 if (obj) {
1435                         fprintf(stderr, "  fetch %s for %s\n",
1436                                 oid_to_hex(&ref->old_oid), refname);
1437                         add_fetch_request(obj);
1438                 }
1439         }
1440
1441         ref->next = remote_refs;
1442         remote_refs = ref;
1443 }
1444
1445 static void get_dav_remote_heads(void)
1446 {
1447         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1448 }
1449
1450 static void add_remote_info_ref(struct remote_ls_ctx *ls)
1451 {
1452         struct strbuf *buf = (struct strbuf *)ls->userData;
1453         struct object *o;
1454         struct ref *ref;
1455
1456         ref = alloc_ref(ls->dentry_name);
1457
1458         if (http_fetch_ref(repo->url, ref) != 0) {
1459                 fprintf(stderr,
1460                         "Unable to fetch ref %s from %s\n",
1461                         ls->dentry_name, repo->url);
1462                 aborted = 1;
1463                 free(ref);
1464                 return;
1465         }
1466
1467         o = parse_object(ref->old_oid.hash);
1468         if (!o) {
1469                 fprintf(stderr,
1470                         "Unable to parse object %s for remote ref %s\n",
1471                         oid_to_hex(&ref->old_oid), ls->dentry_name);
1472                 aborted = 1;
1473                 free(ref);
1474                 return;
1475         }
1476
1477         strbuf_addf(buf, "%s\t%s\n",
1478                     oid_to_hex(&ref->old_oid), ls->dentry_name);
1479
1480         if (o->type == OBJ_TAG) {
1481                 o = deref_tag(o, ls->dentry_name, 0);
1482                 if (o)
1483                         strbuf_addf(buf, "%s\t%s^{}\n",
1484                                     oid_to_hex(&o->oid), ls->dentry_name);
1485         }
1486         free(ref);
1487 }
1488
1489 static void update_remote_info_refs(struct remote_lock *lock)
1490 {
1491         struct buffer buffer = { STRBUF_INIT, 0 };
1492         struct active_request_slot *slot;
1493         struct slot_results results;
1494         struct curl_slist *dav_headers;
1495
1496         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
1497                   add_remote_info_ref, &buffer.buf);
1498         if (!aborted) {
1499                 dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1500
1501                 slot = get_active_slot();
1502                 slot->results = &results;
1503                 curl_setup_http(slot->curl, lock->url, DAV_PUT,
1504                                 &buffer, fwrite_null);
1505                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1506
1507                 if (start_active_slot(slot)) {
1508                         run_active_slot(slot);
1509                         if (results.curl_result != CURLE_OK) {
1510                                 fprintf(stderr,
1511                                         "PUT error: curl result=%d, HTTP code=%ld\n",
1512                                         results.curl_result, results.http_code);
1513                         }
1514                 }
1515         }
1516         strbuf_release(&buffer.buf);
1517 }
1518
1519 static int remote_exists(const char *path)
1520 {
1521         char *url = xstrfmt("%s%s", repo->url, path);
1522         int ret;
1523
1524
1525         switch (http_get_strbuf(url, NULL, NULL)) {
1526         case HTTP_OK:
1527                 ret = 1;
1528                 break;
1529         case HTTP_MISSING_TARGET:
1530                 ret = 0;
1531                 break;
1532         case HTTP_ERROR:
1533                 error("unable to access '%s': %s", url, curl_errorstr);
1534         default:
1535                 ret = -1;
1536         }
1537         free(url);
1538         return ret;
1539 }
1540
1541 static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
1542 {
1543         char *url = xstrfmt("%s%s", repo->url, path);
1544         struct strbuf buffer = STRBUF_INIT;
1545         const char *name;
1546
1547         if (http_get_strbuf(url, &buffer, NULL) != HTTP_OK)
1548                 die("Couldn't get %s for remote symref\n%s", url,
1549                     curl_errorstr);
1550         free(url);
1551
1552         free(*symref);
1553         *symref = NULL;
1554         hashclr(sha1);
1555
1556         if (buffer.len == 0)
1557                 return;
1558
1559         /* Cut off trailing newline. */
1560         strbuf_rtrim(&buffer);
1561
1562         /* If it's a symref, set the refname; otherwise try for a sha1 */
1563         if (skip_prefix(buffer.buf, "ref: ", &name)) {
1564                 *symref = xmemdupz(name, buffer.len - (name - buffer.buf));
1565         } else {
1566                 get_sha1_hex(buffer.buf, sha1);
1567         }
1568
1569         strbuf_release(&buffer);
1570 }
1571
1572 static int verify_merge_base(unsigned char *head_sha1, struct ref *remote)
1573 {
1574         struct commit *head = lookup_commit_or_die(head_sha1, "HEAD");
1575         struct commit *branch = lookup_commit_or_die(remote->old_oid.hash, remote->name);
1576
1577         return in_merge_bases(branch, head);
1578 }
1579
1580 static int delete_remote_branch(const char *pattern, int force)
1581 {
1582         struct ref *refs = remote_refs;
1583         struct ref *remote_ref = NULL;
1584         unsigned char head_sha1[20];
1585         char *symref = NULL;
1586         int match;
1587         int patlen = strlen(pattern);
1588         int i;
1589         struct active_request_slot *slot;
1590         struct slot_results results;
1591         char *url;
1592
1593         /* Find the remote branch(es) matching the specified branch name */
1594         for (match = 0; refs; refs = refs->next) {
1595                 char *name = refs->name;
1596                 int namelen = strlen(name);
1597                 if (namelen < patlen ||
1598                     memcmp(name + namelen - patlen, pattern, patlen))
1599                         continue;
1600                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
1601                         continue;
1602                 match++;
1603                 remote_ref = refs;
1604         }
1605         if (match == 0)
1606                 return error("No remote branch matches %s", pattern);
1607         if (match != 1)
1608                 return error("More than one remote branch matches %s",
1609                              pattern);
1610
1611         /*
1612          * Remote HEAD must be a symref (not exactly foolproof; a remote
1613          * symlink to a symref will look like a symref)
1614          */
1615         fetch_symref("HEAD", &symref, head_sha1);
1616         if (!symref)
1617                 return error("Remote HEAD is not a symref");
1618
1619         /* Remote branch must not be the remote HEAD */
1620         for (i = 0; symref && i < MAXDEPTH; i++) {
1621                 if (!strcmp(remote_ref->name, symref))
1622                         return error("Remote branch %s is the current HEAD",
1623                                      remote_ref->name);
1624                 fetch_symref(symref, &symref, head_sha1);
1625         }
1626
1627         /* Run extra sanity checks if delete is not forced */
1628         if (!force) {
1629                 /* Remote HEAD must resolve to a known object */
1630                 if (symref)
1631                         return error("Remote HEAD symrefs too deep");
1632                 if (is_null_sha1(head_sha1))
1633                         return error("Unable to resolve remote HEAD");
1634                 if (!has_sha1_file(head_sha1))
1635                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
1636
1637                 /* Remote branch must resolve to a known object */
1638                 if (is_null_oid(&remote_ref->old_oid))
1639                         return error("Unable to resolve remote branch %s",
1640                                      remote_ref->name);
1641                 if (!has_object_file(&remote_ref->old_oid))
1642                         return error("Remote branch %s resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", remote_ref->name, oid_to_hex(&remote_ref->old_oid));
1643
1644                 /* Remote branch must be an ancestor of remote HEAD */
1645                 if (!verify_merge_base(head_sha1, remote_ref)) {
1646                         return error("The branch '%s' is not an ancestor "
1647                                      "of your current HEAD.\n"
1648                                      "If you are sure you want to delete it,"
1649                                      " run:\n\t'git http-push -D %s %s'",
1650                                      remote_ref->name, repo->url, pattern);
1651                 }
1652         }
1653
1654         /* Send delete request */
1655         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
1656         if (dry_run)
1657                 return 0;
1658         url = xstrfmt("%s%s", repo->url, remote_ref->name);
1659         slot = get_active_slot();
1660         slot->results = &results;
1661         curl_setup_http_get(slot->curl, url, DAV_DELETE);
1662         if (start_active_slot(slot)) {
1663                 run_active_slot(slot);
1664                 free(url);
1665                 if (results.curl_result != CURLE_OK)
1666                         return error("DELETE request failed (%d/%ld)",
1667                                      results.curl_result, results.http_code);
1668         } else {
1669                 free(url);
1670                 return error("Unable to start DELETE request");
1671         }
1672
1673         return 0;
1674 }
1675
1676 static void run_request_queue(void)
1677 {
1678 #ifdef USE_CURL_MULTI
1679         is_running_queue = 1;
1680         fill_active_slots();
1681         add_fill_function(NULL, fill_active_slot);
1682 #endif
1683         do {
1684                 finish_all_active_slots();
1685 #ifdef USE_CURL_MULTI
1686                 fill_active_slots();
1687 #endif
1688         } while (request_queue_head && !aborted);
1689
1690 #ifdef USE_CURL_MULTI
1691         is_running_queue = 0;
1692 #endif
1693 }
1694
1695 int cmd_main(int argc, const char **argv)
1696 {
1697         struct transfer_request *request;
1698         struct transfer_request *next_request;
1699         int nr_refspec = 0;
1700         const char **refspec = NULL;
1701         struct remote_lock *ref_lock = NULL;
1702         struct remote_lock *info_ref_lock = NULL;
1703         struct rev_info revs;
1704         int delete_branch = 0;
1705         int force_delete = 0;
1706         int objects_to_send;
1707         int rc = 0;
1708         int i;
1709         int new_refs;
1710         struct ref *ref, *local_refs;
1711
1712         repo = xcalloc(1, sizeof(*repo));
1713
1714         argv++;
1715         for (i = 1; i < argc; i++, argv++) {
1716                 const char *arg = *argv;
1717
1718                 if (*arg == '-') {
1719                         if (!strcmp(arg, "--all")) {
1720                                 push_all = MATCH_REFS_ALL;
1721                                 continue;
1722                         }
1723                         if (!strcmp(arg, "--force")) {
1724                                 force_all = 1;
1725                                 continue;
1726                         }
1727                         if (!strcmp(arg, "--dry-run")) {
1728                                 dry_run = 1;
1729                                 continue;
1730                         }
1731                         if (!strcmp(arg, "--helper-status")) {
1732                                 helper_status = 1;
1733                                 continue;
1734                         }
1735                         if (!strcmp(arg, "--verbose")) {
1736                                 push_verbosely = 1;
1737                                 http_is_verbose = 1;
1738                                 continue;
1739                         }
1740                         if (!strcmp(arg, "-d")) {
1741                                 delete_branch = 1;
1742                                 continue;
1743                         }
1744                         if (!strcmp(arg, "-D")) {
1745                                 delete_branch = 1;
1746                                 force_delete = 1;
1747                                 continue;
1748                         }
1749                         if (!strcmp(arg, "-h"))
1750                                 usage(http_push_usage);
1751                 }
1752                 if (!repo->url) {
1753                         char *path = strstr(arg, "//");
1754                         str_end_url_with_slash(arg, &repo->url);
1755                         repo->path_len = strlen(repo->url);
1756                         if (path) {
1757                                 repo->path = strchr(path+2, '/');
1758                                 if (repo->path)
1759                                         repo->path_len = strlen(repo->path);
1760                         }
1761                         continue;
1762                 }
1763                 refspec = argv;
1764                 nr_refspec = argc - i;
1765                 break;
1766         }
1767
1768 #ifndef USE_CURL_MULTI
1769         die("git-push is not available for http/https repository when not compiled with USE_CURL_MULTI");
1770 #endif
1771
1772         if (!repo->url)
1773                 usage(http_push_usage);
1774
1775         if (delete_branch && nr_refspec != 1)
1776                 die("You must specify only one branch name when deleting a remote branch");
1777
1778         setup_git_directory();
1779
1780         memset(remote_dir_exists, -1, 256);
1781
1782         http_init(NULL, repo->url, 1);
1783
1784 #ifdef USE_CURL_MULTI
1785         is_running_queue = 0;
1786 #endif
1787
1788         /* Verify DAV compliance/lock support */
1789         if (!locking_available()) {
1790                 rc = 1;
1791                 goto cleanup;
1792         }
1793
1794         sigchain_push_common(remove_locks_on_signal);
1795
1796         /* Check whether the remote has server info files */
1797         repo->can_update_info_refs = 0;
1798         repo->has_info_refs = remote_exists("info/refs");
1799         repo->has_info_packs = remote_exists("objects/info/packs");
1800         if (repo->has_info_refs) {
1801                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
1802                 if (info_ref_lock)
1803                         repo->can_update_info_refs = 1;
1804                 else {
1805                         error("cannot lock existing info/refs");
1806                         rc = 1;
1807                         goto cleanup;
1808                 }
1809         }
1810         if (repo->has_info_packs)
1811                 fetch_indices();
1812
1813         /* Get a list of all local and remote heads to validate refspecs */
1814         local_refs = get_local_heads();
1815         fprintf(stderr, "Fetching remote heads...\n");
1816         get_dav_remote_heads();
1817         run_request_queue();
1818
1819         /* Remove a remote branch if -d or -D was specified */
1820         if (delete_branch) {
1821                 if (delete_remote_branch(refspec[0], force_delete) == -1) {
1822                         fprintf(stderr, "Unable to delete remote branch %s\n",
1823                                 refspec[0]);
1824                         if (helper_status)
1825                                 printf("error %s cannot remove\n", refspec[0]);
1826                 }
1827                 goto cleanup;
1828         }
1829
1830         /* match them up */
1831         if (match_push_refs(local_refs, &remote_refs,
1832                             nr_refspec, (const char **) refspec, push_all)) {
1833                 rc = -1;
1834                 goto cleanup;
1835         }
1836         if (!remote_refs) {
1837                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
1838                 if (helper_status)
1839                         printf("error null no match\n");
1840                 rc = 0;
1841                 goto cleanup;
1842         }
1843
1844         new_refs = 0;
1845         for (ref = remote_refs; ref; ref = ref->next) {
1846                 struct argv_array commit_argv = ARGV_ARRAY_INIT;
1847
1848                 if (!ref->peer_ref)
1849                         continue;
1850
1851                 if (is_null_oid(&ref->peer_ref->new_oid)) {
1852                         if (delete_remote_branch(ref->name, 1) == -1) {
1853                                 error("Could not remove %s", ref->name);
1854                                 if (helper_status)
1855                                         printf("error %s cannot remove\n", ref->name);
1856                                 rc = -4;
1857                         }
1858                         else if (helper_status)
1859                                 printf("ok %s\n", ref->name);
1860                         new_refs++;
1861                         continue;
1862                 }
1863
1864                 if (!oidcmp(&ref->old_oid, &ref->peer_ref->new_oid)) {
1865                         if (push_verbosely)
1866                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
1867                         if (helper_status)
1868                                 printf("ok %s up to date\n", ref->name);
1869                         continue;
1870                 }
1871
1872                 if (!force_all &&
1873                     !is_null_oid(&ref->old_oid) &&
1874                     !ref->force) {
1875                         if (!has_object_file(&ref->old_oid) ||
1876                             !ref_newer(&ref->peer_ref->new_oid,
1877                                        &ref->old_oid)) {
1878                                 /*
1879                                  * We do not have the remote ref, or
1880                                  * we know that the remote ref is not
1881                                  * an ancestor of what we are trying to
1882                                  * push.  Either way this can be losing
1883                                  * commits at the remote end and likely
1884                                  * we were not up to date to begin with.
1885                                  */
1886                                 error("remote '%s' is not an ancestor of\n"
1887                                       "local '%s'.\n"
1888                                       "Maybe you are not up-to-date and "
1889                                       "need to pull first?",
1890                                       ref->name,
1891                                       ref->peer_ref->name);
1892                                 if (helper_status)
1893                                         printf("error %s non-fast forward\n", ref->name);
1894                                 rc = -2;
1895                                 continue;
1896                         }
1897                 }
1898                 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1899                 new_refs++;
1900
1901                 fprintf(stderr, "updating '%s'", ref->name);
1902                 if (strcmp(ref->name, ref->peer_ref->name))
1903                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
1904                 fprintf(stderr, "\n  from %s\n  to   %s\n",
1905                         oid_to_hex(&ref->old_oid), oid_to_hex(&ref->new_oid));
1906                 if (dry_run) {
1907                         if (helper_status)
1908                                 printf("ok %s\n", ref->name);
1909                         continue;
1910                 }
1911
1912                 /* Lock remote branch ref */
1913                 ref_lock = lock_remote(ref->name, LOCK_TIME);
1914                 if (ref_lock == NULL) {
1915                         fprintf(stderr, "Unable to lock remote branch %s\n",
1916                                 ref->name);
1917                         if (helper_status)
1918                                 printf("error %s lock error\n", ref->name);
1919                         rc = 1;
1920                         continue;
1921                 }
1922
1923                 /* Set up revision info for this refspec */
1924                 argv_array_push(&commit_argv, ""); /* ignored */
1925                 argv_array_push(&commit_argv, "--objects");
1926                 argv_array_push(&commit_argv, oid_to_hex(&ref->new_oid));
1927                 if (!push_all && !is_null_oid(&ref->old_oid))
1928                         argv_array_pushf(&commit_argv, "^%s",
1929                                          oid_to_hex(&ref->old_oid));
1930                 init_revisions(&revs, setup_git_directory());
1931                 setup_revisions(commit_argv.argc, commit_argv.argv, &revs, NULL);
1932                 revs.edge_hint = 0; /* just in case */
1933
1934                 /* Generate a list of objects that need to be pushed */
1935                 pushing = 0;
1936                 if (prepare_revision_walk(&revs))
1937                         die("revision walk setup failed");
1938                 mark_edges_uninteresting(&revs, NULL);
1939                 objects_to_send = get_delta(&revs, ref_lock);
1940                 finish_all_active_slots();
1941
1942                 /* Push missing objects to remote, this would be a
1943                    convenient time to pack them first if appropriate. */
1944                 pushing = 1;
1945                 if (objects_to_send)
1946                         fprintf(stderr, "    sending %d objects\n",
1947                                 objects_to_send);
1948
1949                 run_request_queue();
1950
1951                 /* Update the remote branch if all went well */
1952                 if (aborted || !update_remote(ref->new_oid.hash, ref_lock))
1953                         rc = 1;
1954
1955                 if (!rc)
1956                         fprintf(stderr, "    done\n");
1957                 if (helper_status)
1958                         printf("%s %s\n", !rc ? "ok" : "error", ref->name);
1959                 unlock_remote(ref_lock);
1960                 check_locks();
1961                 argv_array_clear(&commit_argv);
1962         }
1963
1964         /* Update remote server info if appropriate */
1965         if (repo->has_info_refs && new_refs) {
1966                 if (info_ref_lock && repo->can_update_info_refs) {
1967                         fprintf(stderr, "Updating remote server info\n");
1968                         if (!dry_run)
1969                                 update_remote_info_refs(info_ref_lock);
1970                 } else {
1971                         fprintf(stderr, "Unable to update server info\n");
1972                 }
1973         }
1974
1975  cleanup:
1976         if (info_ref_lock)
1977                 unlock_remote(info_ref_lock);
1978         free(repo);
1979
1980         http_cleanup();
1981
1982         request = request_queue_head;
1983         while (request != NULL) {
1984                 next_request = request->next;
1985                 release_request(request);
1986                 request = next_request;
1987         }
1988
1989         return rc;
1990 }