Merge branch 'rs/apply-validate-input'
[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_AND_NULL(request->url);
295         }
296 }
297 #endif
298
299 static void start_fetch_packed(struct transfer_request *request)
300 {
301         struct packed_git *target;
302
303         struct transfer_request *check_request = request_queue_head;
304         struct http_pack_request *preq;
305
306         target = find_sha1_pack(request->obj->oid.hash, repo->packs);
307         if (!target) {
308                 fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", oid_to_hex(&request->obj->oid));
309                 repo->can_update_info_refs = 0;
310                 release_request(request);
311                 return;
312         }
313
314         fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
315         fprintf(stderr, " which contains %s\n", oid_to_hex(&request->obj->oid));
316
317         preq = new_http_pack_request(target, repo->url);
318         if (preq == NULL) {
319                 repo->can_update_info_refs = 0;
320                 return;
321         }
322         preq->lst = &repo->packs;
323
324         /* Make sure there isn't another open request for this pack */
325         while (check_request) {
326                 if (check_request->state == RUN_FETCH_PACKED &&
327                     !strcmp(check_request->url, preq->url)) {
328                         release_http_pack_request(preq);
329                         release_request(request);
330                         return;
331                 }
332                 check_request = check_request->next;
333         }
334
335         preq->slot->callback_func = process_response;
336         preq->slot->callback_data = request;
337         request->slot = preq->slot;
338         request->userData = preq;
339
340         /* Try to get the request started, abort the request on error */
341         request->state = RUN_FETCH_PACKED;
342         if (!start_active_slot(preq->slot)) {
343                 fprintf(stderr, "Unable to start GET request\n");
344                 release_http_pack_request(preq);
345                 repo->can_update_info_refs = 0;
346                 release_request(request);
347         }
348 }
349
350 static void start_put(struct transfer_request *request)
351 {
352         char *hex = oid_to_hex(&request->obj->oid);
353         struct active_request_slot *slot;
354         struct strbuf buf = STRBUF_INIT;
355         enum object_type type;
356         char hdr[50];
357         void *unpacked;
358         unsigned long len;
359         int hdrlen;
360         ssize_t size;
361         git_zstream stream;
362
363         unpacked = read_sha1_file(request->obj->oid.hash, &type, &len);
364         hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(type), len) + 1;
365
366         /* Set it up */
367         git_deflate_init(&stream, zlib_compression_level);
368         size = git_deflate_bound(&stream, len + hdrlen);
369         strbuf_init(&request->buffer.buf, size);
370         request->buffer.posn = 0;
371
372         /* Compress it */
373         stream.next_out = (unsigned char *)request->buffer.buf.buf;
374         stream.avail_out = size;
375
376         /* First header.. */
377         stream.next_in = (void *)hdr;
378         stream.avail_in = hdrlen;
379         while (git_deflate(&stream, 0) == Z_OK)
380                 ; /* nothing */
381
382         /* Then the data itself.. */
383         stream.next_in = unpacked;
384         stream.avail_in = len;
385         while (git_deflate(&stream, Z_FINISH) == Z_OK)
386                 ; /* nothing */
387         git_deflate_end(&stream);
388         free(unpacked);
389
390         request->buffer.buf.len = stream.total_out;
391
392         strbuf_addstr(&buf, "Destination: ");
393         append_remote_object_url(&buf, repo->url, hex, 0);
394         request->dest = strbuf_detach(&buf, NULL);
395
396         append_remote_object_url(&buf, repo->url, hex, 0);
397         strbuf_add(&buf, request->lock->tmpfile_suffix, 41);
398         request->url = strbuf_detach(&buf, NULL);
399
400         slot = get_active_slot();
401         slot->callback_func = process_response;
402         slot->callback_data = request;
403         curl_setup_http(slot->curl, request->url, DAV_PUT,
404                         &request->buffer, fwrite_null);
405
406         if (start_active_slot(slot)) {
407                 request->slot = slot;
408                 request->state = RUN_PUT;
409         } else {
410                 request->state = ABORTED;
411                 FREE_AND_NULL(request->url);
412         }
413 }
414
415 static void start_move(struct transfer_request *request)
416 {
417         struct active_request_slot *slot;
418         struct curl_slist *dav_headers = http_copy_default_headers();
419
420         slot = get_active_slot();
421         slot->callback_func = process_response;
422         slot->callback_data = request;
423         curl_setup_http_get(slot->curl, request->url, DAV_MOVE);
424         dav_headers = curl_slist_append(dav_headers, request->dest);
425         dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
426         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
427
428         if (start_active_slot(slot)) {
429                 request->slot = slot;
430                 request->state = RUN_MOVE;
431         } else {
432                 request->state = ABORTED;
433                 FREE_AND_NULL(request->url);
434         }
435 }
436
437 static int refresh_lock(struct remote_lock *lock)
438 {
439         struct active_request_slot *slot;
440         struct slot_results results;
441         struct curl_slist *dav_headers;
442         int rc = 0;
443
444         lock->refreshing = 1;
445
446         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF | DAV_HEADER_TIMEOUT);
447
448         slot = get_active_slot();
449         slot->results = &results;
450         curl_setup_http_get(slot->curl, lock->url, DAV_LOCK);
451         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
452
453         if (start_active_slot(slot)) {
454                 run_active_slot(slot);
455                 if (results.curl_result != CURLE_OK) {
456                         fprintf(stderr, "LOCK HTTP error %ld\n",
457                                 results.http_code);
458                 } else {
459                         lock->start_time = time(NULL);
460                         rc = 1;
461                 }
462         }
463
464         lock->refreshing = 0;
465         curl_slist_free_all(dav_headers);
466
467         return rc;
468 }
469
470 static void check_locks(void)
471 {
472         struct remote_lock *lock = repo->locks;
473         time_t current_time = time(NULL);
474         int time_remaining;
475
476         while (lock) {
477                 time_remaining = lock->start_time + lock->timeout -
478                         current_time;
479                 if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
480                         if (!refresh_lock(lock)) {
481                                 fprintf(stderr,
482                                         "Unable to refresh lock for %s\n",
483                                         lock->url);
484                                 aborted = 1;
485                                 return;
486                         }
487                 }
488                 lock = lock->next;
489         }
490 }
491
492 static void release_request(struct transfer_request *request)
493 {
494         struct transfer_request *entry = request_queue_head;
495
496         if (request == request_queue_head) {
497                 request_queue_head = request->next;
498         } else {
499                 while (entry->next != NULL && entry->next != request)
500                         entry = entry->next;
501                 if (entry->next == request)
502                         entry->next = entry->next->next;
503         }
504
505         free(request->url);
506         free(request);
507 }
508
509 static void finish_request(struct transfer_request *request)
510 {
511         struct http_pack_request *preq;
512         struct http_object_request *obj_req;
513
514         request->curl_result = request->slot->curl_result;
515         request->http_code = request->slot->http_code;
516         request->slot = NULL;
517
518         /* Keep locks active */
519         check_locks();
520
521         if (request->headers != NULL)
522                 curl_slist_free_all(request->headers);
523
524         /* URL is reused for MOVE after PUT */
525         if (request->state != RUN_PUT) {
526                 FREE_AND_NULL(request->url);
527         }
528
529         if (request->state == RUN_MKCOL) {
530                 if (request->curl_result == CURLE_OK ||
531                     request->http_code == 405) {
532                         remote_dir_exists[request->obj->oid.hash[0]] = 1;
533                         start_put(request);
534                 } else {
535                         fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
536                                 oid_to_hex(&request->obj->oid),
537                                 request->curl_result, request->http_code);
538                         request->state = ABORTED;
539                         aborted = 1;
540                 }
541         } else if (request->state == RUN_PUT) {
542                 if (request->curl_result == CURLE_OK) {
543                         start_move(request);
544                 } else {
545                         fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
546                                 oid_to_hex(&request->obj->oid),
547                                 request->curl_result, request->http_code);
548                         request->state = ABORTED;
549                         aborted = 1;
550                 }
551         } else if (request->state == RUN_MOVE) {
552                 if (request->curl_result == CURLE_OK) {
553                         if (push_verbosely)
554                                 fprintf(stderr, "    sent %s\n",
555                                         oid_to_hex(&request->obj->oid));
556                         request->obj->flags |= REMOTE;
557                         release_request(request);
558                 } else {
559                         fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
560                                 oid_to_hex(&request->obj->oid),
561                                 request->curl_result, request->http_code);
562                         request->state = ABORTED;
563                         aborted = 1;
564                 }
565         } else if (request->state == RUN_FETCH_LOOSE) {
566                 obj_req = (struct http_object_request *)request->userData;
567
568                 if (finish_http_object_request(obj_req) == 0)
569                         if (obj_req->rename == 0)
570                                 request->obj->flags |= (LOCAL | REMOTE);
571
572                 /* Try fetching packed if necessary */
573                 if (request->obj->flags & LOCAL) {
574                         release_http_object_request(obj_req);
575                         release_request(request);
576                 } else
577                         start_fetch_packed(request);
578
579         } else if (request->state == RUN_FETCH_PACKED) {
580                 int fail = 1;
581                 if (request->curl_result != CURLE_OK) {
582                         fprintf(stderr, "Unable to get pack file %s\n%s",
583                                 request->url, curl_errorstr);
584                 } else {
585                         preq = (struct http_pack_request *)request->userData;
586
587                         if (preq) {
588                                 if (finish_http_pack_request(preq) == 0)
589                                         fail = 0;
590                                 release_http_pack_request(preq);
591                         }
592                 }
593                 if (fail)
594                         repo->can_update_info_refs = 0;
595                 release_request(request);
596         }
597 }
598
599 #ifdef USE_CURL_MULTI
600 static int is_running_queue;
601 static int fill_active_slot(void *unused)
602 {
603         struct transfer_request *request;
604
605         if (aborted || !is_running_queue)
606                 return 0;
607
608         for (request = request_queue_head; request; request = request->next) {
609                 if (request->state == NEED_FETCH) {
610                         start_fetch_loose(request);
611                         return 1;
612                 } else if (pushing && request->state == NEED_PUSH) {
613                         if (remote_dir_exists[request->obj->oid.hash[0]] == 1) {
614                                 start_put(request);
615                         } else {
616                                 start_mkcol(request);
617                         }
618                         return 1;
619                 }
620         }
621         return 0;
622 }
623 #endif
624
625 static void get_remote_object_list(unsigned char parent);
626
627 static void add_fetch_request(struct object *obj)
628 {
629         struct transfer_request *request;
630
631         check_locks();
632
633         /*
634          * Don't fetch the object if it's known to exist locally
635          * or is already in the request queue
636          */
637         if (remote_dir_exists[obj->oid.hash[0]] == -1)
638                 get_remote_object_list(obj->oid.hash[0]);
639         if (obj->flags & (LOCAL | FETCHING))
640                 return;
641
642         obj->flags |= FETCHING;
643         request = xmalloc(sizeof(*request));
644         request->obj = obj;
645         request->url = NULL;
646         request->lock = NULL;
647         request->headers = NULL;
648         request->state = NEED_FETCH;
649         request->next = request_queue_head;
650         request_queue_head = request;
651
652 #ifdef USE_CURL_MULTI
653         fill_active_slots();
654         step_active_slots();
655 #endif
656 }
657
658 static int add_send_request(struct object *obj, struct remote_lock *lock)
659 {
660         struct transfer_request *request;
661         struct packed_git *target;
662
663         /* Keep locks active */
664         check_locks();
665
666         /*
667          * Don't push the object if it's known to exist on the remote
668          * or is already in the request queue
669          */
670         if (remote_dir_exists[obj->oid.hash[0]] == -1)
671                 get_remote_object_list(obj->oid.hash[0]);
672         if (obj->flags & (REMOTE | PUSHING))
673                 return 0;
674         target = find_sha1_pack(obj->oid.hash, repo->packs);
675         if (target) {
676                 obj->flags |= REMOTE;
677                 return 0;
678         }
679
680         obj->flags |= PUSHING;
681         request = xmalloc(sizeof(*request));
682         request->obj = obj;
683         request->url = NULL;
684         request->lock = lock;
685         request->headers = NULL;
686         request->state = NEED_PUSH;
687         request->next = request_queue_head;
688         request_queue_head = request;
689
690 #ifdef USE_CURL_MULTI
691         fill_active_slots();
692         step_active_slots();
693 #endif
694
695         return 1;
696 }
697
698 static int fetch_indices(void)
699 {
700         int ret;
701
702         if (push_verbosely)
703                 fprintf(stderr, "Getting pack list\n");
704
705         switch (http_get_info_packs(repo->url, &repo->packs)) {
706         case HTTP_OK:
707         case HTTP_MISSING_TARGET:
708                 ret = 0;
709                 break;
710         default:
711                 ret = -1;
712         }
713
714         return ret;
715 }
716
717 static void one_remote_object(const struct object_id *oid)
718 {
719         struct object *obj;
720
721         obj = lookup_object(oid->hash);
722         if (!obj)
723                 obj = parse_object(oid);
724
725         /* Ignore remote objects that don't exist locally */
726         if (!obj)
727                 return;
728
729         obj->flags |= REMOTE;
730         if (!object_list_contains(objects, obj))
731                 object_list_insert(obj, &objects);
732 }
733
734 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
735 {
736         int *lock_flags = (int *)ctx->userData;
737
738         if (tag_closed) {
739                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
740                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
741                             (*lock_flags & DAV_PROP_LOCKWR)) {
742                                 *lock_flags |= DAV_LOCK_OK;
743                         }
744                         *lock_flags &= DAV_LOCK_OK;
745                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
746                         *lock_flags |= DAV_PROP_LOCKWR;
747                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
748                         *lock_flags |= DAV_PROP_LOCKEX;
749                 }
750         }
751 }
752
753 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
754 {
755         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
756         git_SHA_CTX sha_ctx;
757         unsigned char lock_token_sha1[20];
758
759         if (tag_closed && ctx->cdata) {
760                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
761                         lock->owner = xstrdup(ctx->cdata);
762                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
763                         const char *arg;
764                         if (skip_prefix(ctx->cdata, "Second-", &arg))
765                                 lock->timeout = strtol(arg, NULL, 10);
766                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
767                         lock->token = xstrdup(ctx->cdata);
768
769                         git_SHA1_Init(&sha_ctx);
770                         git_SHA1_Update(&sha_ctx, lock->token, strlen(lock->token));
771                         git_SHA1_Final(lock_token_sha1, &sha_ctx);
772
773                         lock->tmpfile_suffix[0] = '_';
774                         memcpy(lock->tmpfile_suffix + 1, sha1_to_hex(lock_token_sha1), 40);
775                 }
776         }
777 }
778
779 static void one_remote_ref(const char *refname);
780
781 static void
782 xml_start_tag(void *userData, const char *name, const char **atts)
783 {
784         struct xml_ctx *ctx = (struct xml_ctx *)userData;
785         const char *c = strchr(name, ':');
786         int old_namelen, new_len;
787
788         if (c == NULL)
789                 c = name;
790         else
791                 c++;
792
793         old_namelen = strlen(ctx->name);
794         new_len = old_namelen + strlen(c) + 2;
795
796         if (new_len > ctx->len) {
797                 ctx->name = xrealloc(ctx->name, new_len);
798                 ctx->len = new_len;
799         }
800         xsnprintf(ctx->name + old_namelen, ctx->len - old_namelen, ".%s", c);
801
802         FREE_AND_NULL(ctx->cdata);
803
804         ctx->userFunc(ctx, 0);
805 }
806
807 static void
808 xml_end_tag(void *userData, const char *name)
809 {
810         struct xml_ctx *ctx = (struct xml_ctx *)userData;
811         const char *c = strchr(name, ':');
812         char *ep;
813
814         ctx->userFunc(ctx, 1);
815
816         if (c == NULL)
817                 c = name;
818         else
819                 c++;
820
821         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
822         *ep = 0;
823 }
824
825 static void
826 xml_cdata(void *userData, const XML_Char *s, int len)
827 {
828         struct xml_ctx *ctx = (struct xml_ctx *)userData;
829         free(ctx->cdata);
830         ctx->cdata = xmemdupz(s, len);
831 }
832
833 static struct remote_lock *lock_remote(const char *path, long timeout)
834 {
835         struct active_request_slot *slot;
836         struct slot_results results;
837         struct buffer out_buffer = { STRBUF_INIT, 0 };
838         struct strbuf in_buffer = STRBUF_INIT;
839         char *url;
840         char *ep;
841         char timeout_header[25];
842         struct remote_lock *lock = NULL;
843         struct curl_slist *dav_headers = http_copy_default_headers();
844         struct xml_ctx ctx;
845         char *escaped;
846
847         url = xstrfmt("%s%s", repo->url, path);
848
849         /* Make sure leading directories exist for the remote ref */
850         ep = strchr(url + strlen(repo->url) + 1, '/');
851         while (ep) {
852                 char saved_character = ep[1];
853                 ep[1] = '\0';
854                 slot = get_active_slot();
855                 slot->results = &results;
856                 curl_setup_http_get(slot->curl, url, DAV_MKCOL);
857                 if (start_active_slot(slot)) {
858                         run_active_slot(slot);
859                         if (results.curl_result != CURLE_OK &&
860                             results.http_code != 405) {
861                                 fprintf(stderr,
862                                         "Unable to create branch path %s\n",
863                                         url);
864                                 free(url);
865                                 return NULL;
866                         }
867                 } else {
868                         fprintf(stderr, "Unable to start MKCOL request\n");
869                         free(url);
870                         return NULL;
871                 }
872                 ep[1] = saved_character;
873                 ep = strchr(ep + 1, '/');
874         }
875
876         escaped = xml_entities(ident_default_email());
877         strbuf_addf(&out_buffer.buf, LOCK_REQUEST, escaped);
878         free(escaped);
879
880         xsnprintf(timeout_header, sizeof(timeout_header), "Timeout: Second-%ld", timeout);
881         dav_headers = curl_slist_append(dav_headers, timeout_header);
882         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
883
884         slot = get_active_slot();
885         slot->results = &results;
886         curl_setup_http(slot->curl, url, DAV_LOCK, &out_buffer, fwrite_buffer);
887         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
888         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
889
890         lock = xcalloc(1, sizeof(*lock));
891         lock->timeout = -1;
892
893         if (start_active_slot(slot)) {
894                 run_active_slot(slot);
895                 if (results.curl_result == CURLE_OK) {
896                         XML_Parser parser = XML_ParserCreate(NULL);
897                         enum XML_Status result;
898                         ctx.name = xcalloc(10, 1);
899                         ctx.len = 0;
900                         ctx.cdata = NULL;
901                         ctx.userFunc = handle_new_lock_ctx;
902                         ctx.userData = lock;
903                         XML_SetUserData(parser, &ctx);
904                         XML_SetElementHandler(parser, xml_start_tag,
905                                               xml_end_tag);
906                         XML_SetCharacterDataHandler(parser, xml_cdata);
907                         result = XML_Parse(parser, in_buffer.buf,
908                                            in_buffer.len, 1);
909                         free(ctx.name);
910                         if (result != XML_STATUS_OK) {
911                                 fprintf(stderr, "XML error: %s\n",
912                                         XML_ErrorString(
913                                                 XML_GetErrorCode(parser)));
914                                 lock->timeout = -1;
915                         }
916                         XML_ParserFree(parser);
917                 }
918         } else {
919                 fprintf(stderr, "Unable to start LOCK request\n");
920         }
921
922         curl_slist_free_all(dav_headers);
923         strbuf_release(&out_buffer.buf);
924         strbuf_release(&in_buffer);
925
926         if (lock->token == NULL || lock->timeout <= 0) {
927                 free(lock->token);
928                 free(lock->owner);
929                 free(url);
930                 FREE_AND_NULL(lock);
931         } else {
932                 lock->url = url;
933                 lock->start_time = time(NULL);
934                 lock->next = repo->locks;
935                 repo->locks = lock;
936         }
937
938         return lock;
939 }
940
941 static int unlock_remote(struct remote_lock *lock)
942 {
943         struct active_request_slot *slot;
944         struct slot_results results;
945         struct remote_lock *prev = repo->locks;
946         struct curl_slist *dav_headers;
947         int rc = 0;
948
949         dav_headers = get_dav_token_headers(lock, DAV_HEADER_LOCK);
950
951         slot = get_active_slot();
952         slot->results = &results;
953         curl_setup_http_get(slot->curl, lock->url, DAV_UNLOCK);
954         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
955
956         if (start_active_slot(slot)) {
957                 run_active_slot(slot);
958                 if (results.curl_result == CURLE_OK)
959                         rc = 1;
960                 else
961                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
962                                 results.http_code);
963         } else {
964                 fprintf(stderr, "Unable to start UNLOCK request\n");
965         }
966
967         curl_slist_free_all(dav_headers);
968
969         if (repo->locks == lock) {
970                 repo->locks = lock->next;
971         } else {
972                 while (prev && prev->next != lock)
973                         prev = prev->next;
974                 if (prev)
975                         prev->next = prev->next->next;
976         }
977
978         free(lock->owner);
979         free(lock->url);
980         free(lock->token);
981         free(lock);
982
983         return rc;
984 }
985
986 static void remove_locks(void)
987 {
988         struct remote_lock *lock = repo->locks;
989
990         fprintf(stderr, "Removing remote locks...\n");
991         while (lock) {
992                 struct remote_lock *next = lock->next;
993                 unlock_remote(lock);
994                 lock = next;
995         }
996 }
997
998 static void remove_locks_on_signal(int signo)
999 {
1000         remove_locks();
1001         sigchain_pop(signo);
1002         raise(signo);
1003 }
1004
1005 static void remote_ls(const char *path, int flags,
1006                       void (*userFunc)(struct remote_ls_ctx *ls),
1007                       void *userData);
1008
1009 /* extract hex from sharded "xx/x{40}" filename */
1010 static int get_oid_hex_from_objpath(const char *path, struct object_id *oid)
1011 {
1012         char hex[GIT_MAX_HEXSZ];
1013
1014         if (strlen(path) != GIT_SHA1_HEXSZ + 1)
1015                 return -1;
1016
1017         memcpy(hex, path, 2);
1018         path += 2;
1019         path++; /* skip '/' */
1020         memcpy(hex, path, GIT_SHA1_HEXSZ - 2);
1021
1022         return get_oid_hex(hex, oid);
1023 }
1024
1025 static void process_ls_object(struct remote_ls_ctx *ls)
1026 {
1027         unsigned int *parent = (unsigned int *)ls->userData;
1028         const char *path = ls->dentry_name;
1029         struct object_id oid;
1030
1031         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1032                 remote_dir_exists[*parent] = 1;
1033                 return;
1034         }
1035
1036         if (!skip_prefix(path, "objects/", &path) ||
1037             get_oid_hex_from_objpath(path, &oid))
1038                 return;
1039
1040         one_remote_object(&oid);
1041 }
1042
1043 static void process_ls_ref(struct remote_ls_ctx *ls)
1044 {
1045         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1046                 fprintf(stderr, "  %s\n", ls->dentry_name);
1047                 return;
1048         }
1049
1050         if (!(ls->dentry_flags & IS_DIR))
1051                 one_remote_ref(ls->dentry_name);
1052 }
1053
1054 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1055 {
1056         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1057
1058         if (tag_closed) {
1059                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1060                         if (ls->dentry_flags & IS_DIR) {
1061
1062                                 /* ensure collection names end with slash */
1063                                 str_end_url_with_slash(ls->dentry_name, &ls->dentry_name);
1064
1065                                 if (ls->flags & PROCESS_DIRS) {
1066                                         ls->userFunc(ls);
1067                                 }
1068                                 if (strcmp(ls->dentry_name, ls->path) &&
1069                                     ls->flags & RECURSIVE) {
1070                                         remote_ls(ls->dentry_name,
1071                                                   ls->flags,
1072                                                   ls->userFunc,
1073                                                   ls->userData);
1074                                 }
1075                         } else if (ls->flags & PROCESS_FILES) {
1076                                 ls->userFunc(ls);
1077                         }
1078                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1079                         char *path = ctx->cdata;
1080                         if (*ctx->cdata == 'h') {
1081                                 path = strstr(path, "//");
1082                                 if (path) {
1083                                         path = strchr(path+2, '/');
1084                                 }
1085                         }
1086                         if (path) {
1087                                 const char *url = repo->url;
1088                                 if (repo->path)
1089                                         url = repo->path;
1090                                 if (strncmp(path, url, repo->path_len))
1091                                         error("Parsed path '%s' does not match url: '%s'",
1092                                               path, url);
1093                                 else {
1094                                         path += repo->path_len;
1095                                         ls->dentry_name = xstrdup(path);
1096                                 }
1097                         }
1098                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1099                         ls->dentry_flags |= IS_DIR;
1100                 }
1101         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1102                 FREE_AND_NULL(ls->dentry_name);
1103                 ls->dentry_flags = 0;
1104         }
1105 }
1106
1107 /*
1108  * NEEDSWORK: remote_ls() ignores info/refs on the remote side.  But it
1109  * should _only_ heed the information from that file, instead of trying to
1110  * determine the refs from the remote file system (badly: it does not even
1111  * know about packed-refs).
1112  */
1113 static void remote_ls(const char *path, int flags,
1114                       void (*userFunc)(struct remote_ls_ctx *ls),
1115                       void *userData)
1116 {
1117         char *url = xstrfmt("%s%s", repo->url, path);
1118         struct active_request_slot *slot;
1119         struct slot_results results;
1120         struct strbuf in_buffer = STRBUF_INIT;
1121         struct buffer out_buffer = { STRBUF_INIT, 0 };
1122         struct curl_slist *dav_headers = http_copy_default_headers();
1123         struct xml_ctx ctx;
1124         struct remote_ls_ctx ls;
1125
1126         ls.flags = flags;
1127         ls.path = xstrdup(path);
1128         ls.dentry_name = NULL;
1129         ls.dentry_flags = 0;
1130         ls.userData = userData;
1131         ls.userFunc = userFunc;
1132
1133         strbuf_addstr(&out_buffer.buf, PROPFIND_ALL_REQUEST);
1134
1135         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1136         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1137
1138         slot = get_active_slot();
1139         slot->results = &results;
1140         curl_setup_http(slot->curl, url, DAV_PROPFIND,
1141                         &out_buffer, fwrite_buffer);
1142         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1143         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1144
1145         if (start_active_slot(slot)) {
1146                 run_active_slot(slot);
1147                 if (results.curl_result == CURLE_OK) {
1148                         XML_Parser parser = XML_ParserCreate(NULL);
1149                         enum XML_Status result;
1150                         ctx.name = xcalloc(10, 1);
1151                         ctx.len = 0;
1152                         ctx.cdata = NULL;
1153                         ctx.userFunc = handle_remote_ls_ctx;
1154                         ctx.userData = &ls;
1155                         XML_SetUserData(parser, &ctx);
1156                         XML_SetElementHandler(parser, xml_start_tag,
1157                                               xml_end_tag);
1158                         XML_SetCharacterDataHandler(parser, xml_cdata);
1159                         result = XML_Parse(parser, in_buffer.buf,
1160                                            in_buffer.len, 1);
1161                         free(ctx.name);
1162
1163                         if (result != XML_STATUS_OK) {
1164                                 fprintf(stderr, "XML error: %s\n",
1165                                         XML_ErrorString(
1166                                                 XML_GetErrorCode(parser)));
1167                         }
1168                         XML_ParserFree(parser);
1169                 }
1170         } else {
1171                 fprintf(stderr, "Unable to start PROPFIND request\n");
1172         }
1173
1174         free(ls.path);
1175         free(url);
1176         strbuf_release(&out_buffer.buf);
1177         strbuf_release(&in_buffer);
1178         curl_slist_free_all(dav_headers);
1179 }
1180
1181 static void get_remote_object_list(unsigned char parent)
1182 {
1183         char path[] = "objects/XX/";
1184         static const char hex[] = "0123456789abcdef";
1185         unsigned int val = parent;
1186
1187         path[8] = hex[val >> 4];
1188         path[9] = hex[val & 0xf];
1189         remote_dir_exists[val] = 0;
1190         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1191                   process_ls_object, &val);
1192 }
1193
1194 static int locking_available(void)
1195 {
1196         struct active_request_slot *slot;
1197         struct slot_results results;
1198         struct strbuf in_buffer = STRBUF_INIT;
1199         struct buffer out_buffer = { STRBUF_INIT, 0 };
1200         struct curl_slist *dav_headers = http_copy_default_headers();
1201         struct xml_ctx ctx;
1202         int lock_flags = 0;
1203         char *escaped;
1204
1205         escaped = xml_entities(repo->url);
1206         strbuf_addf(&out_buffer.buf, PROPFIND_SUPPORTEDLOCK_REQUEST, escaped);
1207         free(escaped);
1208
1209         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1210         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1211
1212         slot = get_active_slot();
1213         slot->results = &results;
1214         curl_setup_http(slot->curl, repo->url, DAV_PROPFIND,
1215                         &out_buffer, fwrite_buffer);
1216         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1217         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1218
1219         if (start_active_slot(slot)) {
1220                 run_active_slot(slot);
1221                 if (results.curl_result == CURLE_OK) {
1222                         XML_Parser parser = XML_ParserCreate(NULL);
1223                         enum XML_Status result;
1224                         ctx.name = xcalloc(10, 1);
1225                         ctx.len = 0;
1226                         ctx.cdata = NULL;
1227                         ctx.userFunc = handle_lockprop_ctx;
1228                         ctx.userData = &lock_flags;
1229                         XML_SetUserData(parser, &ctx);
1230                         XML_SetElementHandler(parser, xml_start_tag,
1231                                               xml_end_tag);
1232                         result = XML_Parse(parser, in_buffer.buf,
1233                                            in_buffer.len, 1);
1234                         free(ctx.name);
1235
1236                         if (result != XML_STATUS_OK) {
1237                                 fprintf(stderr, "XML error: %s\n",
1238                                         XML_ErrorString(
1239                                                 XML_GetErrorCode(parser)));
1240                                 lock_flags = 0;
1241                         }
1242                         XML_ParserFree(parser);
1243                         if (!lock_flags)
1244                                 error("no DAV locking support on %s",
1245                                       repo->url);
1246
1247                 } else {
1248                         error("Cannot access URL %s, return code %d",
1249                               repo->url, results.curl_result);
1250                         lock_flags = 0;
1251                 }
1252         } else {
1253                 error("Unable to start PROPFIND request on %s", repo->url);
1254         }
1255
1256         strbuf_release(&out_buffer.buf);
1257         strbuf_release(&in_buffer);
1258         curl_slist_free_all(dav_headers);
1259
1260         return lock_flags;
1261 }
1262
1263 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1264 {
1265         struct object_list *entry = xmalloc(sizeof(struct object_list));
1266         entry->item = obj;
1267         entry->next = *p;
1268         *p = entry;
1269         return &entry->next;
1270 }
1271
1272 static struct object_list **process_blob(struct blob *blob,
1273                                          struct object_list **p)
1274 {
1275         struct object *obj = &blob->object;
1276
1277         obj->flags |= LOCAL;
1278
1279         if (obj->flags & (UNINTERESTING | SEEN))
1280                 return p;
1281
1282         obj->flags |= SEEN;
1283         return add_one_object(obj, p);
1284 }
1285
1286 static struct object_list **process_tree(struct tree *tree,
1287                                          struct object_list **p)
1288 {
1289         struct object *obj = &tree->object;
1290         struct tree_desc desc;
1291         struct name_entry entry;
1292
1293         obj->flags |= LOCAL;
1294
1295         if (obj->flags & (UNINTERESTING | SEEN))
1296                 return p;
1297         if (parse_tree(tree) < 0)
1298                 die("bad tree object %s", oid_to_hex(&obj->oid));
1299
1300         obj->flags |= SEEN;
1301         p = add_one_object(obj, p);
1302
1303         init_tree_desc(&desc, tree->buffer, tree->size);
1304
1305         while (tree_entry(&desc, &entry))
1306                 switch (object_type(entry.mode)) {
1307                 case OBJ_TREE:
1308                         p = process_tree(lookup_tree(entry.oid), p);
1309                         break;
1310                 case OBJ_BLOB:
1311                         p = process_blob(lookup_blob(entry.oid), p);
1312                         break;
1313                 default:
1314                         /* Subproject commit - not in this repository */
1315                         break;
1316                 }
1317
1318         free_tree_buffer(tree);
1319         return p;
1320 }
1321
1322 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1323 {
1324         int i;
1325         struct commit *commit;
1326         struct object_list **p = &objects;
1327         int count = 0;
1328
1329         while ((commit = get_revision(revs)) != NULL) {
1330                 p = process_tree(commit->tree, p);
1331                 commit->object.flags |= LOCAL;
1332                 if (!(commit->object.flags & UNINTERESTING))
1333                         count += add_send_request(&commit->object, lock);
1334         }
1335
1336         for (i = 0; i < revs->pending.nr; i++) {
1337                 struct object_array_entry *entry = revs->pending.objects + i;
1338                 struct object *obj = entry->item;
1339                 const char *name = entry->name;
1340
1341                 if (obj->flags & (UNINTERESTING | SEEN))
1342                         continue;
1343                 if (obj->type == OBJ_TAG) {
1344                         obj->flags |= SEEN;
1345                         p = add_one_object(obj, p);
1346                         continue;
1347                 }
1348                 if (obj->type == OBJ_TREE) {
1349                         p = process_tree((struct tree *)obj, p);
1350                         continue;
1351                 }
1352                 if (obj->type == OBJ_BLOB) {
1353                         p = process_blob((struct blob *)obj, p);
1354                         continue;
1355                 }
1356                 die("unknown pending object %s (%s)", oid_to_hex(&obj->oid), name);
1357         }
1358
1359         while (objects) {
1360                 if (!(objects->item->flags & UNINTERESTING))
1361                         count += add_send_request(objects->item, lock);
1362                 objects = objects->next;
1363         }
1364
1365         return count;
1366 }
1367
1368 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1369 {
1370         struct active_request_slot *slot;
1371         struct slot_results results;
1372         struct buffer out_buffer = { STRBUF_INIT, 0 };
1373         struct curl_slist *dav_headers;
1374
1375         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1376
1377         strbuf_addf(&out_buffer.buf, "%s\n", sha1_to_hex(sha1));
1378
1379         slot = get_active_slot();
1380         slot->results = &results;
1381         curl_setup_http(slot->curl, lock->url, DAV_PUT,
1382                         &out_buffer, fwrite_null);
1383         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1384
1385         if (start_active_slot(slot)) {
1386                 run_active_slot(slot);
1387                 strbuf_release(&out_buffer.buf);
1388                 if (results.curl_result != CURLE_OK) {
1389                         fprintf(stderr,
1390                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1391                                 results.curl_result, results.http_code);
1392                         /* We should attempt recovery? */
1393                         return 0;
1394                 }
1395         } else {
1396                 strbuf_release(&out_buffer.buf);
1397                 fprintf(stderr, "Unable to start PUT request\n");
1398                 return 0;
1399         }
1400
1401         return 1;
1402 }
1403
1404 static struct ref *remote_refs;
1405
1406 static void one_remote_ref(const char *refname)
1407 {
1408         struct ref *ref;
1409         struct object *obj;
1410
1411         ref = alloc_ref(refname);
1412
1413         if (http_fetch_ref(repo->url, ref) != 0) {
1414                 fprintf(stderr,
1415                         "Unable to fetch ref %s from %s\n",
1416                         refname, repo->url);
1417                 free(ref);
1418                 return;
1419         }
1420
1421         /*
1422          * Fetch a copy of the object if it doesn't exist locally - it
1423          * may be required for updating server info later.
1424          */
1425         if (repo->can_update_info_refs && !has_object_file(&ref->old_oid)) {
1426                 obj = lookup_unknown_object(ref->old_oid.hash);
1427                 fprintf(stderr, "  fetch %s for %s\n",
1428                         oid_to_hex(&ref->old_oid), refname);
1429                 add_fetch_request(obj);
1430         }
1431
1432         ref->next = remote_refs;
1433         remote_refs = ref;
1434 }
1435
1436 static void get_dav_remote_heads(void)
1437 {
1438         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1439 }
1440
1441 static void add_remote_info_ref(struct remote_ls_ctx *ls)
1442 {
1443         struct strbuf *buf = (struct strbuf *)ls->userData;
1444         struct object *o;
1445         struct ref *ref;
1446
1447         ref = alloc_ref(ls->dentry_name);
1448
1449         if (http_fetch_ref(repo->url, ref) != 0) {
1450                 fprintf(stderr,
1451                         "Unable to fetch ref %s from %s\n",
1452                         ls->dentry_name, repo->url);
1453                 aborted = 1;
1454                 free(ref);
1455                 return;
1456         }
1457
1458         o = parse_object(&ref->old_oid);
1459         if (!o) {
1460                 fprintf(stderr,
1461                         "Unable to parse object %s for remote ref %s\n",
1462                         oid_to_hex(&ref->old_oid), ls->dentry_name);
1463                 aborted = 1;
1464                 free(ref);
1465                 return;
1466         }
1467
1468         strbuf_addf(buf, "%s\t%s\n",
1469                     oid_to_hex(&ref->old_oid), ls->dentry_name);
1470
1471         if (o->type == OBJ_TAG) {
1472                 o = deref_tag(o, ls->dentry_name, 0);
1473                 if (o)
1474                         strbuf_addf(buf, "%s\t%s^{}\n",
1475                                     oid_to_hex(&o->oid), ls->dentry_name);
1476         }
1477         free(ref);
1478 }
1479
1480 static void update_remote_info_refs(struct remote_lock *lock)
1481 {
1482         struct buffer buffer = { STRBUF_INIT, 0 };
1483         struct active_request_slot *slot;
1484         struct slot_results results;
1485         struct curl_slist *dav_headers;
1486
1487         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
1488                   add_remote_info_ref, &buffer.buf);
1489         if (!aborted) {
1490                 dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1491
1492                 slot = get_active_slot();
1493                 slot->results = &results;
1494                 curl_setup_http(slot->curl, lock->url, DAV_PUT,
1495                                 &buffer, fwrite_null);
1496                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1497
1498                 if (start_active_slot(slot)) {
1499                         run_active_slot(slot);
1500                         if (results.curl_result != CURLE_OK) {
1501                                 fprintf(stderr,
1502                                         "PUT error: curl result=%d, HTTP code=%ld\n",
1503                                         results.curl_result, results.http_code);
1504                         }
1505                 }
1506         }
1507         strbuf_release(&buffer.buf);
1508 }
1509
1510 static int remote_exists(const char *path)
1511 {
1512         char *url = xstrfmt("%s%s", repo->url, path);
1513         int ret;
1514
1515
1516         switch (http_get_strbuf(url, NULL, NULL)) {
1517         case HTTP_OK:
1518                 ret = 1;
1519                 break;
1520         case HTTP_MISSING_TARGET:
1521                 ret = 0;
1522                 break;
1523         case HTTP_ERROR:
1524                 error("unable to access '%s': %s", url, curl_errorstr);
1525         default:
1526                 ret = -1;
1527         }
1528         free(url);
1529         return ret;
1530 }
1531
1532 static void fetch_symref(const char *path, char **symref, struct object_id *oid)
1533 {
1534         char *url = xstrfmt("%s%s", repo->url, path);
1535         struct strbuf buffer = STRBUF_INIT;
1536         const char *name;
1537
1538         if (http_get_strbuf(url, &buffer, NULL) != HTTP_OK)
1539                 die("Couldn't get %s for remote symref\n%s", url,
1540                     curl_errorstr);
1541         free(url);
1542
1543         FREE_AND_NULL(*symref);
1544         oidclr(oid);
1545
1546         if (buffer.len == 0)
1547                 return;
1548
1549         /* Cut off trailing newline. */
1550         strbuf_rtrim(&buffer);
1551
1552         /* If it's a symref, set the refname; otherwise try for a sha1 */
1553         if (skip_prefix(buffer.buf, "ref: ", &name)) {
1554                 *symref = xmemdupz(name, buffer.len - (name - buffer.buf));
1555         } else {
1556                 get_oid_hex(buffer.buf, oid);
1557         }
1558
1559         strbuf_release(&buffer);
1560 }
1561
1562 static int verify_merge_base(struct object_id *head_oid, struct ref *remote)
1563 {
1564         struct commit *head = lookup_commit_or_die(head_oid, "HEAD");
1565         struct commit *branch = lookup_commit_or_die(&remote->old_oid,
1566                                                      remote->name);
1567
1568         return in_merge_bases(branch, head);
1569 }
1570
1571 static int delete_remote_branch(const char *pattern, int force)
1572 {
1573         struct ref *refs = remote_refs;
1574         struct ref *remote_ref = NULL;
1575         struct object_id head_oid;
1576         char *symref = NULL;
1577         int match;
1578         int patlen = strlen(pattern);
1579         int i;
1580         struct active_request_slot *slot;
1581         struct slot_results results;
1582         char *url;
1583
1584         /* Find the remote branch(es) matching the specified branch name */
1585         for (match = 0; refs; refs = refs->next) {
1586                 char *name = refs->name;
1587                 int namelen = strlen(name);
1588                 if (namelen < patlen ||
1589                     memcmp(name + namelen - patlen, pattern, patlen))
1590                         continue;
1591                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
1592                         continue;
1593                 match++;
1594                 remote_ref = refs;
1595         }
1596         if (match == 0)
1597                 return error("No remote branch matches %s", pattern);
1598         if (match != 1)
1599                 return error("More than one remote branch matches %s",
1600                              pattern);
1601
1602         /*
1603          * Remote HEAD must be a symref (not exactly foolproof; a remote
1604          * symlink to a symref will look like a symref)
1605          */
1606         fetch_symref("HEAD", &symref, &head_oid);
1607         if (!symref)
1608                 return error("Remote HEAD is not a symref");
1609
1610         /* Remote branch must not be the remote HEAD */
1611         for (i = 0; symref && i < MAXDEPTH; i++) {
1612                 if (!strcmp(remote_ref->name, symref))
1613                         return error("Remote branch %s is the current HEAD",
1614                                      remote_ref->name);
1615                 fetch_symref(symref, &symref, &head_oid);
1616         }
1617
1618         /* Run extra sanity checks if delete is not forced */
1619         if (!force) {
1620                 /* Remote HEAD must resolve to a known object */
1621                 if (symref)
1622                         return error("Remote HEAD symrefs too deep");
1623                 if (is_null_oid(&head_oid))
1624                         return error("Unable to resolve remote HEAD");
1625                 if (!has_object_file(&head_oid))
1626                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", oid_to_hex(&head_oid));
1627
1628                 /* Remote branch must resolve to a known object */
1629                 if (is_null_oid(&remote_ref->old_oid))
1630                         return error("Unable to resolve remote branch %s",
1631                                      remote_ref->name);
1632                 if (!has_object_file(&remote_ref->old_oid))
1633                         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));
1634
1635                 /* Remote branch must be an ancestor of remote HEAD */
1636                 if (!verify_merge_base(&head_oid, remote_ref)) {
1637                         return error("The branch '%s' is not an ancestor "
1638                                      "of your current HEAD.\n"
1639                                      "If you are sure you want to delete it,"
1640                                      " run:\n\t'git http-push -D %s %s'",
1641                                      remote_ref->name, repo->url, pattern);
1642                 }
1643         }
1644
1645         /* Send delete request */
1646         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
1647         if (dry_run)
1648                 return 0;
1649         url = xstrfmt("%s%s", repo->url, remote_ref->name);
1650         slot = get_active_slot();
1651         slot->results = &results;
1652         curl_setup_http_get(slot->curl, url, DAV_DELETE);
1653         if (start_active_slot(slot)) {
1654                 run_active_slot(slot);
1655                 free(url);
1656                 if (results.curl_result != CURLE_OK)
1657                         return error("DELETE request failed (%d/%ld)",
1658                                      results.curl_result, results.http_code);
1659         } else {
1660                 free(url);
1661                 return error("Unable to start DELETE request");
1662         }
1663
1664         return 0;
1665 }
1666
1667 static void run_request_queue(void)
1668 {
1669 #ifdef USE_CURL_MULTI
1670         is_running_queue = 1;
1671         fill_active_slots();
1672         add_fill_function(NULL, fill_active_slot);
1673 #endif
1674         do {
1675                 finish_all_active_slots();
1676 #ifdef USE_CURL_MULTI
1677                 fill_active_slots();
1678 #endif
1679         } while (request_queue_head && !aborted);
1680
1681 #ifdef USE_CURL_MULTI
1682         is_running_queue = 0;
1683 #endif
1684 }
1685
1686 int cmd_main(int argc, const char **argv)
1687 {
1688         struct transfer_request *request;
1689         struct transfer_request *next_request;
1690         int nr_refspec = 0;
1691         const char **refspec = NULL;
1692         struct remote_lock *ref_lock = NULL;
1693         struct remote_lock *info_ref_lock = NULL;
1694         struct rev_info revs;
1695         int delete_branch = 0;
1696         int force_delete = 0;
1697         int objects_to_send;
1698         int rc = 0;
1699         int i;
1700         int new_refs;
1701         struct ref *ref, *local_refs;
1702
1703         repo = xcalloc(1, sizeof(*repo));
1704
1705         argv++;
1706         for (i = 1; i < argc; i++, argv++) {
1707                 const char *arg = *argv;
1708
1709                 if (*arg == '-') {
1710                         if (!strcmp(arg, "--all")) {
1711                                 push_all = MATCH_REFS_ALL;
1712                                 continue;
1713                         }
1714                         if (!strcmp(arg, "--force")) {
1715                                 force_all = 1;
1716                                 continue;
1717                         }
1718                         if (!strcmp(arg, "--dry-run")) {
1719                                 dry_run = 1;
1720                                 continue;
1721                         }
1722                         if (!strcmp(arg, "--helper-status")) {
1723                                 helper_status = 1;
1724                                 continue;
1725                         }
1726                         if (!strcmp(arg, "--verbose")) {
1727                                 push_verbosely = 1;
1728                                 http_is_verbose = 1;
1729                                 continue;
1730                         }
1731                         if (!strcmp(arg, "-d")) {
1732                                 delete_branch = 1;
1733                                 continue;
1734                         }
1735                         if (!strcmp(arg, "-D")) {
1736                                 delete_branch = 1;
1737                                 force_delete = 1;
1738                                 continue;
1739                         }
1740                         if (!strcmp(arg, "-h"))
1741                                 usage(http_push_usage);
1742                 }
1743                 if (!repo->url) {
1744                         char *path = strstr(arg, "//");
1745                         str_end_url_with_slash(arg, &repo->url);
1746                         repo->path_len = strlen(repo->url);
1747                         if (path) {
1748                                 repo->path = strchr(path+2, '/');
1749                                 if (repo->path)
1750                                         repo->path_len = strlen(repo->path);
1751                         }
1752                         continue;
1753                 }
1754                 refspec = argv;
1755                 nr_refspec = argc - i;
1756                 break;
1757         }
1758
1759 #ifndef USE_CURL_MULTI
1760         die("git-push is not available for http/https repository when not compiled with USE_CURL_MULTI");
1761 #endif
1762
1763         if (!repo->url)
1764                 usage(http_push_usage);
1765
1766         if (delete_branch && nr_refspec != 1)
1767                 die("You must specify only one branch name when deleting a remote branch");
1768
1769         setup_git_directory();
1770
1771         memset(remote_dir_exists, -1, 256);
1772
1773         http_init(NULL, repo->url, 1);
1774
1775 #ifdef USE_CURL_MULTI
1776         is_running_queue = 0;
1777 #endif
1778
1779         /* Verify DAV compliance/lock support */
1780         if (!locking_available()) {
1781                 rc = 1;
1782                 goto cleanup;
1783         }
1784
1785         sigchain_push_common(remove_locks_on_signal);
1786
1787         /* Check whether the remote has server info files */
1788         repo->can_update_info_refs = 0;
1789         repo->has_info_refs = remote_exists("info/refs");
1790         repo->has_info_packs = remote_exists("objects/info/packs");
1791         if (repo->has_info_refs) {
1792                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
1793                 if (info_ref_lock)
1794                         repo->can_update_info_refs = 1;
1795                 else {
1796                         error("cannot lock existing info/refs");
1797                         rc = 1;
1798                         goto cleanup;
1799                 }
1800         }
1801         if (repo->has_info_packs)
1802                 fetch_indices();
1803
1804         /* Get a list of all local and remote heads to validate refspecs */
1805         local_refs = get_local_heads();
1806         fprintf(stderr, "Fetching remote heads...\n");
1807         get_dav_remote_heads();
1808         run_request_queue();
1809
1810         /* Remove a remote branch if -d or -D was specified */
1811         if (delete_branch) {
1812                 if (delete_remote_branch(refspec[0], force_delete) == -1) {
1813                         fprintf(stderr, "Unable to delete remote branch %s\n",
1814                                 refspec[0]);
1815                         if (helper_status)
1816                                 printf("error %s cannot remove\n", refspec[0]);
1817                 }
1818                 goto cleanup;
1819         }
1820
1821         /* match them up */
1822         if (match_push_refs(local_refs, &remote_refs,
1823                             nr_refspec, (const char **) refspec, push_all)) {
1824                 rc = -1;
1825                 goto cleanup;
1826         }
1827         if (!remote_refs) {
1828                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
1829                 if (helper_status)
1830                         printf("error null no match\n");
1831                 rc = 0;
1832                 goto cleanup;
1833         }
1834
1835         new_refs = 0;
1836         for (ref = remote_refs; ref; ref = ref->next) {
1837                 struct argv_array commit_argv = ARGV_ARRAY_INIT;
1838
1839                 if (!ref->peer_ref)
1840                         continue;
1841
1842                 if (is_null_oid(&ref->peer_ref->new_oid)) {
1843                         if (delete_remote_branch(ref->name, 1) == -1) {
1844                                 error("Could not remove %s", ref->name);
1845                                 if (helper_status)
1846                                         printf("error %s cannot remove\n", ref->name);
1847                                 rc = -4;
1848                         }
1849                         else if (helper_status)
1850                                 printf("ok %s\n", ref->name);
1851                         new_refs++;
1852                         continue;
1853                 }
1854
1855                 if (!oidcmp(&ref->old_oid, &ref->peer_ref->new_oid)) {
1856                         if (push_verbosely)
1857                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
1858                         if (helper_status)
1859                                 printf("ok %s up to date\n", ref->name);
1860                         continue;
1861                 }
1862
1863                 if (!force_all &&
1864                     !is_null_oid(&ref->old_oid) &&
1865                     !ref->force) {
1866                         if (!has_object_file(&ref->old_oid) ||
1867                             !ref_newer(&ref->peer_ref->new_oid,
1868                                        &ref->old_oid)) {
1869                                 /*
1870                                  * We do not have the remote ref, or
1871                                  * we know that the remote ref is not
1872                                  * an ancestor of what we are trying to
1873                                  * push.  Either way this can be losing
1874                                  * commits at the remote end and likely
1875                                  * we were not up to date to begin with.
1876                                  */
1877                                 error("remote '%s' is not an ancestor of\n"
1878                                       "local '%s'.\n"
1879                                       "Maybe you are not up-to-date and "
1880                                       "need to pull first?",
1881                                       ref->name,
1882                                       ref->peer_ref->name);
1883                                 if (helper_status)
1884                                         printf("error %s non-fast forward\n", ref->name);
1885                                 rc = -2;
1886                                 continue;
1887                         }
1888                 }
1889                 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1890                 new_refs++;
1891
1892                 fprintf(stderr, "updating '%s'", ref->name);
1893                 if (strcmp(ref->name, ref->peer_ref->name))
1894                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
1895                 fprintf(stderr, "\n  from %s\n  to   %s\n",
1896                         oid_to_hex(&ref->old_oid), oid_to_hex(&ref->new_oid));
1897                 if (dry_run) {
1898                         if (helper_status)
1899                                 printf("ok %s\n", ref->name);
1900                         continue;
1901                 }
1902
1903                 /* Lock remote branch ref */
1904                 ref_lock = lock_remote(ref->name, LOCK_TIME);
1905                 if (ref_lock == NULL) {
1906                         fprintf(stderr, "Unable to lock remote branch %s\n",
1907                                 ref->name);
1908                         if (helper_status)
1909                                 printf("error %s lock error\n", ref->name);
1910                         rc = 1;
1911                         continue;
1912                 }
1913
1914                 /* Set up revision info for this refspec */
1915                 argv_array_push(&commit_argv, ""); /* ignored */
1916                 argv_array_push(&commit_argv, "--objects");
1917                 argv_array_push(&commit_argv, oid_to_hex(&ref->new_oid));
1918                 if (!push_all && !is_null_oid(&ref->old_oid))
1919                         argv_array_pushf(&commit_argv, "^%s",
1920                                          oid_to_hex(&ref->old_oid));
1921                 init_revisions(&revs, setup_git_directory());
1922                 setup_revisions(commit_argv.argc, commit_argv.argv, &revs, NULL);
1923                 revs.edge_hint = 0; /* just in case */
1924
1925                 /* Generate a list of objects that need to be pushed */
1926                 pushing = 0;
1927                 if (prepare_revision_walk(&revs))
1928                         die("revision walk setup failed");
1929                 mark_edges_uninteresting(&revs, NULL);
1930                 objects_to_send = get_delta(&revs, ref_lock);
1931                 finish_all_active_slots();
1932
1933                 /* Push missing objects to remote, this would be a
1934                    convenient time to pack them first if appropriate. */
1935                 pushing = 1;
1936                 if (objects_to_send)
1937                         fprintf(stderr, "    sending %d objects\n",
1938                                 objects_to_send);
1939
1940                 run_request_queue();
1941
1942                 /* Update the remote branch if all went well */
1943                 if (aborted || !update_remote(ref->new_oid.hash, ref_lock))
1944                         rc = 1;
1945
1946                 if (!rc)
1947                         fprintf(stderr, "    done\n");
1948                 if (helper_status)
1949                         printf("%s %s\n", !rc ? "ok" : "error", ref->name);
1950                 unlock_remote(ref_lock);
1951                 check_locks();
1952                 argv_array_clear(&commit_argv);
1953         }
1954
1955         /* Update remote server info if appropriate */
1956         if (repo->has_info_refs && new_refs) {
1957                 if (info_ref_lock && repo->can_update_info_refs) {
1958                         fprintf(stderr, "Updating remote server info\n");
1959                         if (!dry_run)
1960                                 update_remote_info_refs(info_ref_lock);
1961                 } else {
1962                         fprintf(stderr, "Unable to update server info\n");
1963                 }
1964         }
1965
1966  cleanup:
1967         if (info_ref_lock)
1968                 unlock_remote(info_ref_lock);
1969         free(repo);
1970
1971         http_cleanup();
1972
1973         request = request_queue_head;
1974         while (request != NULL) {
1975                 next_request = request->next;
1976                 release_request(request);
1977                 request = next_request;
1978         }
1979
1980         return rc;
1981 }