mingw: fix isatty() after dup2()
[git] / http-push.c
1 #include "cache.h"
2 #include "repository.h"
3 #include "commit.h"
4 #include "tag.h"
5 #include "blob.h"
6 #include "http.h"
7 #include "refs.h"
8 #include "diff.h"
9 #include "revision.h"
10 #include "exec-cmd.h"
11 #include "remote.h"
12 #include "list-objects.h"
13 #include "sigchain.h"
14 #include "argv-array.h"
15 #include "packfile.h"
16 #include "object-store.h"
17 #include "commit-reach.h"
18
19 #ifdef EXPAT_NEEDS_XMLPARSE_H
20 #include <xmlparse.h>
21 #else
22 #include <expat.h>
23 #endif
24
25 static const char http_push_usage[] =
26 "git http-push [--all] [--dry-run] [--force] [--verbose] <remote> [<head>...]\n";
27
28 #ifndef XML_STATUS_OK
29 enum XML_Status {
30   XML_STATUS_OK = 1,
31   XML_STATUS_ERROR = 0
32 };
33 #define XML_STATUS_OK    1
34 #define XML_STATUS_ERROR 0
35 #endif
36
37 #define PREV_BUF_SIZE 4096
38
39 /* DAV methods */
40 #define DAV_LOCK "LOCK"
41 #define DAV_MKCOL "MKCOL"
42 #define DAV_MOVE "MOVE"
43 #define DAV_PROPFIND "PROPFIND"
44 #define DAV_PUT "PUT"
45 #define DAV_UNLOCK "UNLOCK"
46 #define DAV_DELETE "DELETE"
47
48 /* DAV lock flags */
49 #define DAV_PROP_LOCKWR (1u << 0)
50 #define DAV_PROP_LOCKEX (1u << 1)
51 #define DAV_LOCK_OK (1u << 2)
52
53 /* DAV XML properties */
54 #define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
55 #define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
56 #define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
57 #define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
58 #define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
59 #define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
60 #define DAV_PROPFIND_RESP ".multistatus.response"
61 #define DAV_PROPFIND_NAME ".multistatus.response.href"
62 #define DAV_PROPFIND_COLLECTION ".multistatus.response.propstat.prop.resourcetype.collection"
63
64 /* DAV request body templates */
65 #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>"
66 #define PROPFIND_ALL_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/>\n</D:propfind>"
67 #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>"
68
69 #define LOCK_TIME 600
70 #define LOCK_REFRESH 30
71
72 /* Remember to update object flag allocation in object.h */
73 #define LOCAL    (1u<<16)
74 #define REMOTE   (1u<<17)
75 #define FETCHING (1u<<18)
76 #define PUSHING  (1u<<19)
77
78 /* We allow "recursive" symbolic refs. Only within reason, though */
79 #define MAXDEPTH 5
80
81 static int pushing;
82 static int aborted;
83 static signed char remote_dir_exists[256];
84
85 static int push_verbosely;
86 static int push_all = MATCH_REFS_NONE;
87 static int force_all;
88 static int dry_run;
89 static int helper_status;
90
91 static struct object_list *objects;
92
93 struct repo {
94         char *url;
95         char *path;
96         int path_len;
97         int has_info_refs;
98         int can_update_info_refs;
99         int has_info_packs;
100         struct packed_git *packs;
101         struct remote_lock *locks;
102 };
103
104 static struct repo *repo;
105
106 enum transfer_state {
107         NEED_FETCH,
108         RUN_FETCH_LOOSE,
109         RUN_FETCH_PACKED,
110         NEED_PUSH,
111         RUN_MKCOL,
112         RUN_PUT,
113         RUN_MOVE,
114         ABORTED,
115         COMPLETE
116 };
117
118 struct transfer_request {
119         struct object *obj;
120         char *url;
121         char *dest;
122         struct remote_lock *lock;
123         struct curl_slist *headers;
124         struct buffer buffer;
125         enum transfer_state state;
126         CURLcode curl_result;
127         char errorstr[CURL_ERROR_SIZE];
128         long http_code;
129         void *userData;
130         struct active_request_slot *slot;
131         struct transfer_request *next;
132 };
133
134 static struct transfer_request *request_queue_head;
135
136 struct xml_ctx {
137         char *name;
138         int len;
139         char *cdata;
140         void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
141         void *userData;
142 };
143
144 struct remote_lock {
145         char *url;
146         char *owner;
147         char *token;
148         char tmpfile_suffix[41];
149         time_t start_time;
150         long timeout;
151         int refreshing;
152         struct remote_lock *next;
153 };
154
155 /* Flags that control remote_ls processing */
156 #define PROCESS_FILES (1u << 0)
157 #define PROCESS_DIRS  (1u << 1)
158 #define RECURSIVE     (1u << 2)
159
160 /* Flags that remote_ls passes to callback functions */
161 #define IS_DIR (1u << 0)
162
163 struct remote_ls_ctx {
164         char *path;
165         void (*userFunc)(struct remote_ls_ctx *ls);
166         void *userData;
167         int flags;
168         char *dentry_name;
169         int dentry_flags;
170         struct remote_ls_ctx *parent;
171 };
172
173 /* get_dav_token_headers options */
174 enum dav_header_flag {
175         DAV_HEADER_IF = (1u << 0),
176         DAV_HEADER_LOCK = (1u << 1),
177         DAV_HEADER_TIMEOUT = (1u << 2)
178 };
179
180 static char *xml_entities(const char *s)
181 {
182         struct strbuf buf = STRBUF_INIT;
183         strbuf_addstr_xml_quoted(&buf, s);
184         return strbuf_detach(&buf, NULL);
185 }
186
187 static void curl_setup_http_get(CURL *curl, const char *url,
188                 const char *custom_req)
189 {
190         curl_easy_setopt(curl, CURLOPT_HTTPGET, 1);
191         curl_easy_setopt(curl, CURLOPT_URL, url);
192         curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, custom_req);
193         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_null);
194 }
195
196 static void curl_setup_http(CURL *curl, const char *url,
197                 const char *custom_req, struct buffer *buffer,
198                 curl_write_callback write_fn)
199 {
200         curl_easy_setopt(curl, CURLOPT_PUT, 1);
201         curl_easy_setopt(curl, CURLOPT_URL, url);
202         curl_easy_setopt(curl, CURLOPT_INFILE, buffer);
203         curl_easy_setopt(curl, CURLOPT_INFILESIZE, buffer->buf.len);
204         curl_easy_setopt(curl, CURLOPT_READFUNCTION, fread_buffer);
205 #ifndef NO_CURL_IOCTL
206         curl_easy_setopt(curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
207         curl_easy_setopt(curl, CURLOPT_IOCTLDATA, buffer);
208 #endif
209         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_fn);
210         curl_easy_setopt(curl, CURLOPT_NOBODY, 0);
211         curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, custom_req);
212         curl_easy_setopt(curl, CURLOPT_UPLOAD, 1);
213 }
214
215 static struct curl_slist *get_dav_token_headers(struct remote_lock *lock, enum dav_header_flag options)
216 {
217         struct strbuf buf = STRBUF_INIT;
218         struct curl_slist *dav_headers = http_copy_default_headers();
219
220         if (options & DAV_HEADER_IF) {
221                 strbuf_addf(&buf, "If: (<%s>)", lock->token);
222                 dav_headers = curl_slist_append(dav_headers, buf.buf);
223                 strbuf_reset(&buf);
224         }
225         if (options & DAV_HEADER_LOCK) {
226                 strbuf_addf(&buf, "Lock-Token: <%s>", lock->token);
227                 dav_headers = curl_slist_append(dav_headers, buf.buf);
228                 strbuf_reset(&buf);
229         }
230         if (options & DAV_HEADER_TIMEOUT) {
231                 strbuf_addf(&buf, "Timeout: Second-%ld", lock->timeout);
232                 dav_headers = curl_slist_append(dav_headers, buf.buf);
233                 strbuf_reset(&buf);
234         }
235         strbuf_release(&buf);
236
237         return dav_headers;
238 }
239
240 static void finish_request(struct transfer_request *request);
241 static void release_request(struct transfer_request *request);
242
243 static void process_response(void *callback_data)
244 {
245         struct transfer_request *request =
246                 (struct transfer_request *)callback_data;
247
248         finish_request(request);
249 }
250
251 #ifdef USE_CURL_MULTI
252
253 static void start_fetch_loose(struct transfer_request *request)
254 {
255         struct active_request_slot *slot;
256         struct http_object_request *obj_req;
257
258         obj_req = new_http_object_request(repo->url, request->obj->oid.hash);
259         if (obj_req == NULL) {
260                 request->state = ABORTED;
261                 return;
262         }
263
264         slot = obj_req->slot;
265         slot->callback_func = process_response;
266         slot->callback_data = request;
267         request->slot = slot;
268         request->userData = obj_req;
269
270         /* Try to get the request started, abort the request on error */
271         request->state = RUN_FETCH_LOOSE;
272         if (!start_active_slot(slot)) {
273                 fprintf(stderr, "Unable to start GET request\n");
274                 repo->can_update_info_refs = 0;
275                 release_http_object_request(obj_req);
276                 release_request(request);
277         }
278 }
279
280 static void start_mkcol(struct transfer_request *request)
281 {
282         char *hex = oid_to_hex(&request->obj->oid);
283         struct active_request_slot *slot;
284
285         request->url = get_remote_object_url(repo->url, hex, 1);
286
287         slot = get_active_slot();
288         slot->callback_func = process_response;
289         slot->callback_data = request;
290         curl_setup_http_get(slot->curl, request->url, DAV_MKCOL);
291         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
292
293         if (start_active_slot(slot)) {
294                 request->slot = slot;
295                 request->state = RUN_MKCOL;
296         } else {
297                 request->state = ABORTED;
298                 FREE_AND_NULL(request->url);
299         }
300 }
301 #endif
302
303 static void start_fetch_packed(struct transfer_request *request)
304 {
305         struct packed_git *target;
306
307         struct transfer_request *check_request = request_queue_head;
308         struct http_pack_request *preq;
309
310         target = find_sha1_pack(request->obj->oid.hash, repo->packs);
311         if (!target) {
312                 fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", oid_to_hex(&request->obj->oid));
313                 repo->can_update_info_refs = 0;
314                 release_request(request);
315                 return;
316         }
317
318         fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
319         fprintf(stderr, " which contains %s\n", oid_to_hex(&request->obj->oid));
320
321         preq = new_http_pack_request(target, repo->url);
322         if (preq == NULL) {
323                 repo->can_update_info_refs = 0;
324                 return;
325         }
326         preq->lst = &repo->packs;
327
328         /* Make sure there isn't another open request for this pack */
329         while (check_request) {
330                 if (check_request->state == RUN_FETCH_PACKED &&
331                     !strcmp(check_request->url, preq->url)) {
332                         release_http_pack_request(preq);
333                         release_request(request);
334                         return;
335                 }
336                 check_request = check_request->next;
337         }
338
339         preq->slot->callback_func = process_response;
340         preq->slot->callback_data = request;
341         request->slot = preq->slot;
342         request->userData = preq;
343
344         /* Try to get the request started, abort the request on error */
345         request->state = RUN_FETCH_PACKED;
346         if (!start_active_slot(preq->slot)) {
347                 fprintf(stderr, "Unable to start GET request\n");
348                 release_http_pack_request(preq);
349                 repo->can_update_info_refs = 0;
350                 release_request(request);
351         }
352 }
353
354 static void start_put(struct transfer_request *request)
355 {
356         char *hex = oid_to_hex(&request->obj->oid);
357         struct active_request_slot *slot;
358         struct strbuf buf = STRBUF_INIT;
359         enum object_type type;
360         char hdr[50];
361         void *unpacked;
362         unsigned long len;
363         int hdrlen;
364         ssize_t size;
365         git_zstream stream;
366
367         unpacked = read_object_file(&request->obj->oid, &type, &len);
368         hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", type_name(type), len) + 1;
369
370         /* Set it up */
371         git_deflate_init(&stream, zlib_compression_level);
372         size = git_deflate_bound(&stream, len + hdrlen);
373         strbuf_init(&request->buffer.buf, size);
374         request->buffer.posn = 0;
375
376         /* Compress it */
377         stream.next_out = (unsigned char *)request->buffer.buf.buf;
378         stream.avail_out = size;
379
380         /* First header.. */
381         stream.next_in = (void *)hdr;
382         stream.avail_in = hdrlen;
383         while (git_deflate(&stream, 0) == Z_OK)
384                 ; /* nothing */
385
386         /* Then the data itself.. */
387         stream.next_in = unpacked;
388         stream.avail_in = len;
389         while (git_deflate(&stream, Z_FINISH) == Z_OK)
390                 ; /* nothing */
391         git_deflate_end(&stream);
392         free(unpacked);
393
394         request->buffer.buf.len = stream.total_out;
395
396         strbuf_addstr(&buf, "Destination: ");
397         append_remote_object_url(&buf, repo->url, hex, 0);
398         request->dest = strbuf_detach(&buf, NULL);
399
400         append_remote_object_url(&buf, repo->url, hex, 0);
401         strbuf_add(&buf, request->lock->tmpfile_suffix, 41);
402         request->url = strbuf_detach(&buf, NULL);
403
404         slot = get_active_slot();
405         slot->callback_func = process_response;
406         slot->callback_data = request;
407         curl_setup_http(slot->curl, request->url, DAV_PUT,
408                         &request->buffer, fwrite_null);
409
410         if (start_active_slot(slot)) {
411                 request->slot = slot;
412                 request->state = RUN_PUT;
413         } else {
414                 request->state = ABORTED;
415                 FREE_AND_NULL(request->url);
416         }
417 }
418
419 static void start_move(struct transfer_request *request)
420 {
421         struct active_request_slot *slot;
422         struct curl_slist *dav_headers = http_copy_default_headers();
423
424         slot = get_active_slot();
425         slot->callback_func = process_response;
426         slot->callback_data = request;
427         curl_setup_http_get(slot->curl, request->url, DAV_MOVE);
428         dav_headers = curl_slist_append(dav_headers, request->dest);
429         dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
430         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
431
432         if (start_active_slot(slot)) {
433                 request->slot = slot;
434                 request->state = RUN_MOVE;
435         } else {
436                 request->state = ABORTED;
437                 FREE_AND_NULL(request->url);
438         }
439 }
440
441 static int refresh_lock(struct remote_lock *lock)
442 {
443         struct active_request_slot *slot;
444         struct slot_results results;
445         struct curl_slist *dav_headers;
446         int rc = 0;
447
448         lock->refreshing = 1;
449
450         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF | DAV_HEADER_TIMEOUT);
451
452         slot = get_active_slot();
453         slot->results = &results;
454         curl_setup_http_get(slot->curl, lock->url, DAV_LOCK);
455         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
456
457         if (start_active_slot(slot)) {
458                 run_active_slot(slot);
459                 if (results.curl_result != CURLE_OK) {
460                         fprintf(stderr, "LOCK HTTP error %ld\n",
461                                 results.http_code);
462                 } else {
463                         lock->start_time = time(NULL);
464                         rc = 1;
465                 }
466         }
467
468         lock->refreshing = 0;
469         curl_slist_free_all(dav_headers);
470
471         return rc;
472 }
473
474 static void check_locks(void)
475 {
476         struct remote_lock *lock = repo->locks;
477         time_t current_time = time(NULL);
478         int time_remaining;
479
480         while (lock) {
481                 time_remaining = lock->start_time + lock->timeout -
482                         current_time;
483                 if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
484                         if (!refresh_lock(lock)) {
485                                 fprintf(stderr,
486                                         "Unable to refresh lock for %s\n",
487                                         lock->url);
488                                 aborted = 1;
489                                 return;
490                         }
491                 }
492                 lock = lock->next;
493         }
494 }
495
496 static void release_request(struct transfer_request *request)
497 {
498         struct transfer_request *entry = request_queue_head;
499
500         if (request == request_queue_head) {
501                 request_queue_head = request->next;
502         } else {
503                 while (entry->next != NULL && entry->next != request)
504                         entry = entry->next;
505                 if (entry->next == request)
506                         entry->next = entry->next->next;
507         }
508
509         free(request->url);
510         free(request);
511 }
512
513 static void finish_request(struct transfer_request *request)
514 {
515         struct http_pack_request *preq;
516         struct http_object_request *obj_req;
517
518         request->curl_result = request->slot->curl_result;
519         request->http_code = request->slot->http_code;
520         request->slot = NULL;
521
522         /* Keep locks active */
523         check_locks();
524
525         if (request->headers != NULL)
526                 curl_slist_free_all(request->headers);
527
528         /* URL is reused for MOVE after PUT */
529         if (request->state != RUN_PUT) {
530                 FREE_AND_NULL(request->url);
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 struct object_id *oid)
722 {
723         struct object *obj;
724
725         obj = lookup_object(the_repository, oid->hash);
726         if (!obj)
727                 obj = parse_object(the_repository, oid);
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_AND_NULL(ctx->cdata);
807
808         ctx->userFunc(ctx, 0);
809 }
810
811 static void
812 xml_end_tag(void *userData, const char *name)
813 {
814         struct xml_ctx *ctx = (struct xml_ctx *)userData;
815         const char *c = strchr(name, ':');
816         char *ep;
817
818         ctx->userFunc(ctx, 1);
819
820         if (c == NULL)
821                 c = name;
822         else
823                 c++;
824
825         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
826         *ep = 0;
827 }
828
829 static void
830 xml_cdata(void *userData, const XML_Char *s, int len)
831 {
832         struct xml_ctx *ctx = (struct xml_ctx *)userData;
833         free(ctx->cdata);
834         ctx->cdata = xmemdupz(s, len);
835 }
836
837 static struct remote_lock *lock_remote(const char *path, long timeout)
838 {
839         struct active_request_slot *slot;
840         struct slot_results results;
841         struct buffer out_buffer = { STRBUF_INIT, 0 };
842         struct strbuf in_buffer = STRBUF_INIT;
843         char *url;
844         char *ep;
845         char timeout_header[25];
846         struct remote_lock *lock = NULL;
847         struct curl_slist *dav_headers = http_copy_default_headers();
848         struct xml_ctx ctx;
849         char *escaped;
850
851         url = xstrfmt("%s%s", repo->url, path);
852
853         /* Make sure leading directories exist for the remote ref */
854         ep = strchr(url + strlen(repo->url) + 1, '/');
855         while (ep) {
856                 char saved_character = ep[1];
857                 ep[1] = '\0';
858                 slot = get_active_slot();
859                 slot->results = &results;
860                 curl_setup_http_get(slot->curl, url, DAV_MKCOL);
861                 if (start_active_slot(slot)) {
862                         run_active_slot(slot);
863                         if (results.curl_result != CURLE_OK &&
864                             results.http_code != 405) {
865                                 fprintf(stderr,
866                                         "Unable to create branch path %s\n",
867                                         url);
868                                 free(url);
869                                 return NULL;
870                         }
871                 } else {
872                         fprintf(stderr, "Unable to start MKCOL request\n");
873                         free(url);
874                         return NULL;
875                 }
876                 ep[1] = saved_character;
877                 ep = strchr(ep + 1, '/');
878         }
879
880         escaped = xml_entities(ident_default_email());
881         strbuf_addf(&out_buffer.buf, LOCK_REQUEST, escaped);
882         free(escaped);
883
884         xsnprintf(timeout_header, sizeof(timeout_header), "Timeout: Second-%ld", timeout);
885         dav_headers = curl_slist_append(dav_headers, timeout_header);
886         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
887
888         slot = get_active_slot();
889         slot->results = &results;
890         curl_setup_http(slot->curl, url, DAV_LOCK, &out_buffer, fwrite_buffer);
891         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
892         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
893
894         lock = xcalloc(1, sizeof(*lock));
895         lock->timeout = -1;
896
897         if (start_active_slot(slot)) {
898                 run_active_slot(slot);
899                 if (results.curl_result == CURLE_OK) {
900                         XML_Parser parser = XML_ParserCreate(NULL);
901                         enum XML_Status result;
902                         ctx.name = xcalloc(10, 1);
903                         ctx.len = 0;
904                         ctx.cdata = NULL;
905                         ctx.userFunc = handle_new_lock_ctx;
906                         ctx.userData = lock;
907                         XML_SetUserData(parser, &ctx);
908                         XML_SetElementHandler(parser, xml_start_tag,
909                                               xml_end_tag);
910                         XML_SetCharacterDataHandler(parser, xml_cdata);
911                         result = XML_Parse(parser, in_buffer.buf,
912                                            in_buffer.len, 1);
913                         free(ctx.name);
914                         if (result != XML_STATUS_OK) {
915                                 fprintf(stderr, "XML error: %s\n",
916                                         XML_ErrorString(
917                                                 XML_GetErrorCode(parser)));
918                                 lock->timeout = -1;
919                         }
920                         XML_ParserFree(parser);
921                 } else {
922                         fprintf(stderr,
923                                 "error: curl result=%d, HTTP code=%ld\n",
924                                 results.curl_result, results.http_code);
925                 }
926         } else {
927                 fprintf(stderr, "Unable to start LOCK request\n");
928         }
929
930         curl_slist_free_all(dav_headers);
931         strbuf_release(&out_buffer.buf);
932         strbuf_release(&in_buffer);
933
934         if (lock->token == NULL || lock->timeout <= 0) {
935                 free(lock->token);
936                 free(lock->owner);
937                 free(url);
938                 FREE_AND_NULL(lock);
939         } else {
940                 lock->url = url;
941                 lock->start_time = time(NULL);
942                 lock->next = repo->locks;
943                 repo->locks = lock;
944         }
945
946         return lock;
947 }
948
949 static int unlock_remote(struct remote_lock *lock)
950 {
951         struct active_request_slot *slot;
952         struct slot_results results;
953         struct remote_lock *prev = repo->locks;
954         struct curl_slist *dav_headers;
955         int rc = 0;
956
957         dav_headers = get_dav_token_headers(lock, DAV_HEADER_LOCK);
958
959         slot = get_active_slot();
960         slot->results = &results;
961         curl_setup_http_get(slot->curl, lock->url, DAV_UNLOCK);
962         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
963
964         if (start_active_slot(slot)) {
965                 run_active_slot(slot);
966                 if (results.curl_result == CURLE_OK)
967                         rc = 1;
968                 else
969                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
970                                 results.http_code);
971         } else {
972                 fprintf(stderr, "Unable to start UNLOCK request\n");
973         }
974
975         curl_slist_free_all(dav_headers);
976
977         if (repo->locks == lock) {
978                 repo->locks = lock->next;
979         } else {
980                 while (prev && prev->next != lock)
981                         prev = prev->next;
982                 if (prev)
983                         prev->next = prev->next->next;
984         }
985
986         free(lock->owner);
987         free(lock->url);
988         free(lock->token);
989         free(lock);
990
991         return rc;
992 }
993
994 static void remove_locks(void)
995 {
996         struct remote_lock *lock = repo->locks;
997
998         fprintf(stderr, "Removing remote locks...\n");
999         while (lock) {
1000                 struct remote_lock *next = lock->next;
1001                 unlock_remote(lock);
1002                 lock = next;
1003         }
1004 }
1005
1006 static void remove_locks_on_signal(int signo)
1007 {
1008         remove_locks();
1009         sigchain_pop(signo);
1010         raise(signo);
1011 }
1012
1013 static void remote_ls(const char *path, int flags,
1014                       void (*userFunc)(struct remote_ls_ctx *ls),
1015                       void *userData);
1016
1017 /* extract hex from sharded "xx/x{38}" filename */
1018 static int get_oid_hex_from_objpath(const char *path, struct object_id *oid)
1019 {
1020         if (strlen(path) != GIT_SHA1_HEXSZ + 1)
1021                 return -1;
1022
1023         if (hex_to_bytes(oid->hash, path, 1))
1024                 return -1;
1025         path += 2;
1026         path++; /* skip '/' */
1027
1028         return hex_to_bytes(oid->hash + 1, path, GIT_SHA1_RAWSZ - 1);
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         struct object_id oid;
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_oid_hex_from_objpath(path, &oid))
1044                 return;
1045
1046         one_remote_object(&oid);
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_AND_NULL(ls->dentry_name);
1109                 ls->dentry_flags = 0;
1110         }
1111 }
1112
1113 /*
1114  * NEEDSWORK: remote_ls() ignores info/refs on the remote side.  But it
1115  * should _only_ heed the information from that file, instead of trying to
1116  * determine the refs from the remote file system (badly: it does not even
1117  * know about packed-refs).
1118  */
1119 static void remote_ls(const char *path, int flags,
1120                       void (*userFunc)(struct remote_ls_ctx *ls),
1121                       void *userData)
1122 {
1123         char *url = xstrfmt("%s%s", repo->url, path);
1124         struct active_request_slot *slot;
1125         struct slot_results results;
1126         struct strbuf in_buffer = STRBUF_INIT;
1127         struct buffer out_buffer = { STRBUF_INIT, 0 };
1128         struct curl_slist *dav_headers = http_copy_default_headers();
1129         struct xml_ctx ctx;
1130         struct remote_ls_ctx ls;
1131
1132         ls.flags = flags;
1133         ls.path = xstrdup(path);
1134         ls.dentry_name = NULL;
1135         ls.dentry_flags = 0;
1136         ls.userData = userData;
1137         ls.userFunc = userFunc;
1138
1139         strbuf_addstr(&out_buffer.buf, PROPFIND_ALL_REQUEST);
1140
1141         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1142         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1143
1144         slot = get_active_slot();
1145         slot->results = &results;
1146         curl_setup_http(slot->curl, url, DAV_PROPFIND,
1147                         &out_buffer, fwrite_buffer);
1148         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1149         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1150
1151         if (start_active_slot(slot)) {
1152                 run_active_slot(slot);
1153                 if (results.curl_result == CURLE_OK) {
1154                         XML_Parser parser = XML_ParserCreate(NULL);
1155                         enum XML_Status result;
1156                         ctx.name = xcalloc(10, 1);
1157                         ctx.len = 0;
1158                         ctx.cdata = NULL;
1159                         ctx.userFunc = handle_remote_ls_ctx;
1160                         ctx.userData = &ls;
1161                         XML_SetUserData(parser, &ctx);
1162                         XML_SetElementHandler(parser, xml_start_tag,
1163                                               xml_end_tag);
1164                         XML_SetCharacterDataHandler(parser, xml_cdata);
1165                         result = XML_Parse(parser, in_buffer.buf,
1166                                            in_buffer.len, 1);
1167                         free(ctx.name);
1168
1169                         if (result != XML_STATUS_OK) {
1170                                 fprintf(stderr, "XML error: %s\n",
1171                                         XML_ErrorString(
1172                                                 XML_GetErrorCode(parser)));
1173                         }
1174                         XML_ParserFree(parser);
1175                 }
1176         } else {
1177                 fprintf(stderr, "Unable to start PROPFIND request\n");
1178         }
1179
1180         free(ls.path);
1181         free(url);
1182         strbuf_release(&out_buffer.buf);
1183         strbuf_release(&in_buffer);
1184         curl_slist_free_all(dav_headers);
1185 }
1186
1187 static void get_remote_object_list(unsigned char parent)
1188 {
1189         char path[] = "objects/XX/";
1190         static const char hex[] = "0123456789abcdef";
1191         unsigned int val = parent;
1192
1193         path[8] = hex[val >> 4];
1194         path[9] = hex[val & 0xf];
1195         remote_dir_exists[val] = 0;
1196         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1197                   process_ls_object, &val);
1198 }
1199
1200 static int locking_available(void)
1201 {
1202         struct active_request_slot *slot;
1203         struct slot_results results;
1204         struct strbuf in_buffer = STRBUF_INIT;
1205         struct buffer out_buffer = { STRBUF_INIT, 0 };
1206         struct curl_slist *dav_headers = http_copy_default_headers();
1207         struct xml_ctx ctx;
1208         int lock_flags = 0;
1209         char *escaped;
1210
1211         escaped = xml_entities(repo->url);
1212         strbuf_addf(&out_buffer.buf, PROPFIND_SUPPORTEDLOCK_REQUEST, escaped);
1213         free(escaped);
1214
1215         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1216         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1217
1218         slot = get_active_slot();
1219         slot->results = &results;
1220         curl_setup_http(slot->curl, repo->url, DAV_PROPFIND,
1221                         &out_buffer, fwrite_buffer);
1222         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1223         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1224
1225         if (start_active_slot(slot)) {
1226                 run_active_slot(slot);
1227                 if (results.curl_result == CURLE_OK) {
1228                         XML_Parser parser = XML_ParserCreate(NULL);
1229                         enum XML_Status result;
1230                         ctx.name = xcalloc(10, 1);
1231                         ctx.len = 0;
1232                         ctx.cdata = NULL;
1233                         ctx.userFunc = handle_lockprop_ctx;
1234                         ctx.userData = &lock_flags;
1235                         XML_SetUserData(parser, &ctx);
1236                         XML_SetElementHandler(parser, xml_start_tag,
1237                                               xml_end_tag);
1238                         result = XML_Parse(parser, in_buffer.buf,
1239                                            in_buffer.len, 1);
1240                         free(ctx.name);
1241
1242                         if (result != XML_STATUS_OK) {
1243                                 fprintf(stderr, "XML error: %s\n",
1244                                         XML_ErrorString(
1245                                                 XML_GetErrorCode(parser)));
1246                                 lock_flags = 0;
1247                         }
1248                         XML_ParserFree(parser);
1249                         if (!lock_flags)
1250                                 error("no DAV locking support on %s",
1251                                       repo->url);
1252
1253                 } else {
1254                         error("Cannot access URL %s, return code %d",
1255                               repo->url, results.curl_result);
1256                         lock_flags = 0;
1257                 }
1258         } else {
1259                 error("Unable to start PROPFIND request on %s", repo->url);
1260         }
1261
1262         strbuf_release(&out_buffer.buf);
1263         strbuf_release(&in_buffer);
1264         curl_slist_free_all(dav_headers);
1265
1266         return lock_flags;
1267 }
1268
1269 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1270 {
1271         struct object_list *entry = xmalloc(sizeof(struct object_list));
1272         entry->item = obj;
1273         entry->next = *p;
1274         *p = entry;
1275         return &entry->next;
1276 }
1277
1278 static struct object_list **process_blob(struct blob *blob,
1279                                          struct object_list **p)
1280 {
1281         struct object *obj = &blob->object;
1282
1283         obj->flags |= LOCAL;
1284
1285         if (obj->flags & (UNINTERESTING | SEEN))
1286                 return p;
1287
1288         obj->flags |= SEEN;
1289         return add_one_object(obj, p);
1290 }
1291
1292 static struct object_list **process_tree(struct tree *tree,
1293                                          struct object_list **p)
1294 {
1295         struct object *obj = &tree->object;
1296         struct tree_desc desc;
1297         struct name_entry entry;
1298
1299         obj->flags |= LOCAL;
1300
1301         if (obj->flags & (UNINTERESTING | SEEN))
1302                 return p;
1303         if (parse_tree(tree) < 0)
1304                 die("bad tree object %s", oid_to_hex(&obj->oid));
1305
1306         obj->flags |= SEEN;
1307         p = add_one_object(obj, p);
1308
1309         init_tree_desc(&desc, tree->buffer, tree->size);
1310
1311         while (tree_entry(&desc, &entry))
1312                 switch (object_type(entry.mode)) {
1313                 case OBJ_TREE:
1314                         p = process_tree(lookup_tree(the_repository, entry.oid),
1315                                          p);
1316                         break;
1317                 case OBJ_BLOB:
1318                         p = process_blob(lookup_blob(the_repository, entry.oid),
1319                                          p);
1320                         break;
1321                 default:
1322                         /* Subproject commit - not in this repository */
1323                         break;
1324                 }
1325
1326         free_tree_buffer(tree);
1327         return p;
1328 }
1329
1330 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1331 {
1332         int i;
1333         struct commit *commit;
1334         struct object_list **p = &objects;
1335         int count = 0;
1336
1337         while ((commit = get_revision(revs)) != NULL) {
1338                 p = process_tree(get_commit_tree(commit), p);
1339                 commit->object.flags |= LOCAL;
1340                 if (!(commit->object.flags & UNINTERESTING))
1341                         count += add_send_request(&commit->object, lock);
1342         }
1343
1344         for (i = 0; i < revs->pending.nr; i++) {
1345                 struct object_array_entry *entry = revs->pending.objects + i;
1346                 struct object *obj = entry->item;
1347                 const char *name = entry->name;
1348
1349                 if (obj->flags & (UNINTERESTING | SEEN))
1350                         continue;
1351                 if (obj->type == OBJ_TAG) {
1352                         obj->flags |= SEEN;
1353                         p = add_one_object(obj, p);
1354                         continue;
1355                 }
1356                 if (obj->type == OBJ_TREE) {
1357                         p = process_tree((struct tree *)obj, p);
1358                         continue;
1359                 }
1360                 if (obj->type == OBJ_BLOB) {
1361                         p = process_blob((struct blob *)obj, p);
1362                         continue;
1363                 }
1364                 die("unknown pending object %s (%s)", oid_to_hex(&obj->oid), name);
1365         }
1366
1367         while (objects) {
1368                 if (!(objects->item->flags & UNINTERESTING))
1369                         count += add_send_request(objects->item, lock);
1370                 objects = objects->next;
1371         }
1372
1373         return count;
1374 }
1375
1376 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1377 {
1378         struct active_request_slot *slot;
1379         struct slot_results results;
1380         struct buffer out_buffer = { STRBUF_INIT, 0 };
1381         struct curl_slist *dav_headers;
1382
1383         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1384
1385         strbuf_addf(&out_buffer.buf, "%s\n", sha1_to_hex(sha1));
1386
1387         slot = get_active_slot();
1388         slot->results = &results;
1389         curl_setup_http(slot->curl, lock->url, DAV_PUT,
1390                         &out_buffer, fwrite_null);
1391         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1392
1393         if (start_active_slot(slot)) {
1394                 run_active_slot(slot);
1395                 strbuf_release(&out_buffer.buf);
1396                 if (results.curl_result != CURLE_OK) {
1397                         fprintf(stderr,
1398                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1399                                 results.curl_result, results.http_code);
1400                         /* We should attempt recovery? */
1401                         return 0;
1402                 }
1403         } else {
1404                 strbuf_release(&out_buffer.buf);
1405                 fprintf(stderr, "Unable to start PUT request\n");
1406                 return 0;
1407         }
1408
1409         return 1;
1410 }
1411
1412 static struct ref *remote_refs;
1413
1414 static void one_remote_ref(const char *refname)
1415 {
1416         struct ref *ref;
1417         struct object *obj;
1418
1419         ref = alloc_ref(refname);
1420
1421         if (http_fetch_ref(repo->url, ref) != 0) {
1422                 fprintf(stderr,
1423                         "Unable to fetch ref %s from %s\n",
1424                         refname, repo->url);
1425                 free(ref);
1426                 return;
1427         }
1428
1429         /*
1430          * Fetch a copy of the object if it doesn't exist locally - it
1431          * may be required for updating server info later.
1432          */
1433         if (repo->can_update_info_refs && !has_object_file(&ref->old_oid)) {
1434                 obj = lookup_unknown_object(ref->old_oid.hash);
1435                 fprintf(stderr, "  fetch %s for %s\n",
1436                         oid_to_hex(&ref->old_oid), refname);
1437                 add_fetch_request(obj);
1438         }
1439
1440         ref->next = remote_refs;
1441         remote_refs = ref;
1442 }
1443
1444 static void get_dav_remote_heads(void)
1445 {
1446         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1447 }
1448
1449 static void add_remote_info_ref(struct remote_ls_ctx *ls)
1450 {
1451         struct strbuf *buf = (struct strbuf *)ls->userData;
1452         struct object *o;
1453         struct ref *ref;
1454
1455         ref = alloc_ref(ls->dentry_name);
1456
1457         if (http_fetch_ref(repo->url, ref) != 0) {
1458                 fprintf(stderr,
1459                         "Unable to fetch ref %s from %s\n",
1460                         ls->dentry_name, repo->url);
1461                 aborted = 1;
1462                 free(ref);
1463                 return;
1464         }
1465
1466         o = parse_object(the_repository, &ref->old_oid);
1467         if (!o) {
1468                 fprintf(stderr,
1469                         "Unable to parse object %s for remote ref %s\n",
1470                         oid_to_hex(&ref->old_oid), ls->dentry_name);
1471                 aborted = 1;
1472                 free(ref);
1473                 return;
1474         }
1475
1476         strbuf_addf(buf, "%s\t%s\n",
1477                     oid_to_hex(&ref->old_oid), ls->dentry_name);
1478
1479         if (o->type == OBJ_TAG) {
1480                 o = deref_tag(the_repository, o, ls->dentry_name, 0);
1481                 if (o)
1482                         strbuf_addf(buf, "%s\t%s^{}\n",
1483                                     oid_to_hex(&o->oid), ls->dentry_name);
1484         }
1485         free(ref);
1486 }
1487
1488 static void update_remote_info_refs(struct remote_lock *lock)
1489 {
1490         struct buffer buffer = { STRBUF_INIT, 0 };
1491         struct active_request_slot *slot;
1492         struct slot_results results;
1493         struct curl_slist *dav_headers;
1494
1495         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
1496                   add_remote_info_ref, &buffer.buf);
1497         if (!aborted) {
1498                 dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1499
1500                 slot = get_active_slot();
1501                 slot->results = &results;
1502                 curl_setup_http(slot->curl, lock->url, DAV_PUT,
1503                                 &buffer, fwrite_null);
1504                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1505
1506                 if (start_active_slot(slot)) {
1507                         run_active_slot(slot);
1508                         if (results.curl_result != CURLE_OK) {
1509                                 fprintf(stderr,
1510                                         "PUT error: curl result=%d, HTTP code=%ld\n",
1511                                         results.curl_result, results.http_code);
1512                         }
1513                 }
1514         }
1515         strbuf_release(&buffer.buf);
1516 }
1517
1518 static int remote_exists(const char *path)
1519 {
1520         char *url = xstrfmt("%s%s", repo->url, path);
1521         int ret;
1522
1523
1524         switch (http_get_strbuf(url, NULL, NULL)) {
1525         case HTTP_OK:
1526                 ret = 1;
1527                 break;
1528         case HTTP_MISSING_TARGET:
1529                 ret = 0;
1530                 break;
1531         case HTTP_ERROR:
1532                 error("unable to access '%s': %s", url, curl_errorstr);
1533                 /* fallthrough */
1534         default:
1535                 ret = -1;
1536         }
1537         free(url);
1538         return ret;
1539 }
1540
1541 static void fetch_symref(const char *path, char **symref, struct object_id *oid)
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_AND_NULL(*symref);
1553         oidclr(oid);
1554
1555         if (buffer.len == 0)
1556                 return;
1557
1558         /* Cut off trailing newline. */
1559         strbuf_rtrim(&buffer);
1560
1561         /* If it's a symref, set the refname; otherwise try for a sha1 */
1562         if (skip_prefix(buffer.buf, "ref: ", &name)) {
1563                 *symref = xmemdupz(name, buffer.len - (name - buffer.buf));
1564         } else {
1565                 get_oid_hex(buffer.buf, oid);
1566         }
1567
1568         strbuf_release(&buffer);
1569 }
1570
1571 static int verify_merge_base(struct object_id *head_oid, struct ref *remote)
1572 {
1573         struct commit *head = lookup_commit_or_die(head_oid, "HEAD");
1574         struct commit *branch = lookup_commit_or_die(&remote->old_oid,
1575                                                      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         struct object_id head_oid;
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_oid);
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_oid);
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_oid(&head_oid))
1633                         return error("Unable to resolve remote HEAD");
1634                 if (!has_object_file(&head_oid))
1635                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", oid_to_hex(&head_oid));
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_oid, 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         struct refspec rs = REFSPEC_INIT_PUSH;
1700         struct remote_lock *ref_lock = NULL;
1701         struct remote_lock *info_ref_lock = NULL;
1702         struct rev_info revs;
1703         int delete_branch = 0;
1704         int force_delete = 0;
1705         int objects_to_send;
1706         int rc = 0;
1707         int i;
1708         int new_refs;
1709         struct ref *ref, *local_refs;
1710
1711         repo = xcalloc(1, sizeof(*repo));
1712
1713         argv++;
1714         for (i = 1; i < argc; i++, argv++) {
1715                 const char *arg = *argv;
1716
1717                 if (*arg == '-') {
1718                         if (!strcmp(arg, "--all")) {
1719                                 push_all = MATCH_REFS_ALL;
1720                                 continue;
1721                         }
1722                         if (!strcmp(arg, "--force")) {
1723                                 force_all = 1;
1724                                 continue;
1725                         }
1726                         if (!strcmp(arg, "--dry-run")) {
1727                                 dry_run = 1;
1728                                 continue;
1729                         }
1730                         if (!strcmp(arg, "--helper-status")) {
1731                                 helper_status = 1;
1732                                 continue;
1733                         }
1734                         if (!strcmp(arg, "--verbose")) {
1735                                 push_verbosely = 1;
1736                                 http_is_verbose = 1;
1737                                 continue;
1738                         }
1739                         if (!strcmp(arg, "-d")) {
1740                                 delete_branch = 1;
1741                                 continue;
1742                         }
1743                         if (!strcmp(arg, "-D")) {
1744                                 delete_branch = 1;
1745                                 force_delete = 1;
1746                                 continue;
1747                         }
1748                         if (!strcmp(arg, "-h"))
1749                                 usage(http_push_usage);
1750                 }
1751                 if (!repo->url) {
1752                         char *path = strstr(arg, "//");
1753                         str_end_url_with_slash(arg, &repo->url);
1754                         repo->path_len = strlen(repo->url);
1755                         if (path) {
1756                                 repo->path = strchr(path+2, '/');
1757                                 if (repo->path)
1758                                         repo->path_len = strlen(repo->path);
1759                         }
1760                         continue;
1761                 }
1762                 refspec_appendn(&rs, argv, argc - i);
1763                 break;
1764         }
1765
1766 #ifndef USE_CURL_MULTI
1767         die("git-push is not available for http/https repository when not compiled with USE_CURL_MULTI");
1768 #endif
1769
1770         if (!repo->url)
1771                 usage(http_push_usage);
1772
1773         if (delete_branch && rs.nr != 1)
1774                 die("You must specify only one branch name when deleting a remote branch");
1775
1776         setup_git_directory();
1777
1778         memset(remote_dir_exists, -1, 256);
1779
1780         http_init(NULL, repo->url, 1);
1781
1782 #ifdef USE_CURL_MULTI
1783         is_running_queue = 0;
1784 #endif
1785
1786         /* Verify DAV compliance/lock support */
1787         if (!locking_available()) {
1788                 rc = 1;
1789                 goto cleanup;
1790         }
1791
1792         sigchain_push_common(remove_locks_on_signal);
1793
1794         /* Check whether the remote has server info files */
1795         repo->can_update_info_refs = 0;
1796         repo->has_info_refs = remote_exists("info/refs");
1797         repo->has_info_packs = remote_exists("objects/info/packs");
1798         if (repo->has_info_refs) {
1799                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
1800                 if (info_ref_lock)
1801                         repo->can_update_info_refs = 1;
1802                 else {
1803                         error("cannot lock existing info/refs");
1804                         rc = 1;
1805                         goto cleanup;
1806                 }
1807         }
1808         if (repo->has_info_packs)
1809                 fetch_indices();
1810
1811         /* Get a list of all local and remote heads to validate refspecs */
1812         local_refs = get_local_heads();
1813         fprintf(stderr, "Fetching remote heads...\n");
1814         get_dav_remote_heads();
1815         run_request_queue();
1816
1817         /* Remove a remote branch if -d or -D was specified */
1818         if (delete_branch) {
1819                 const char *branch = rs.items[i].src;
1820                 if (delete_remote_branch(branch, force_delete) == -1) {
1821                         fprintf(stderr, "Unable to delete remote branch %s\n",
1822                                 branch);
1823                         if (helper_status)
1824                                 printf("error %s cannot remove\n", branch);
1825                 }
1826                 goto cleanup;
1827         }
1828
1829         /* match them up */
1830         if (match_push_refs(local_refs, &remote_refs, &rs, push_all)) {
1831                 rc = -1;
1832                 goto cleanup;
1833         }
1834         if (!remote_refs) {
1835                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
1836                 if (helper_status)
1837                         printf("error null no match\n");
1838                 rc = 0;
1839                 goto cleanup;
1840         }
1841
1842         new_refs = 0;
1843         for (ref = remote_refs; ref; ref = ref->next) {
1844                 struct argv_array commit_argv = ARGV_ARRAY_INIT;
1845
1846                 if (!ref->peer_ref)
1847                         continue;
1848
1849                 if (is_null_oid(&ref->peer_ref->new_oid)) {
1850                         if (delete_remote_branch(ref->name, 1) == -1) {
1851                                 error("Could not remove %s", ref->name);
1852                                 if (helper_status)
1853                                         printf("error %s cannot remove\n", ref->name);
1854                                 rc = -4;
1855                         }
1856                         else if (helper_status)
1857                                 printf("ok %s\n", ref->name);
1858                         new_refs++;
1859                         continue;
1860                 }
1861
1862                 if (oideq(&ref->old_oid, &ref->peer_ref->new_oid)) {
1863                         if (push_verbosely)
1864                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
1865                         if (helper_status)
1866                                 printf("ok %s up to date\n", ref->name);
1867                         continue;
1868                 }
1869
1870                 if (!force_all &&
1871                     !is_null_oid(&ref->old_oid) &&
1872                     !ref->force) {
1873                         if (!has_object_file(&ref->old_oid) ||
1874                             !ref_newer(&ref->peer_ref->new_oid,
1875                                        &ref->old_oid)) {
1876                                 /*
1877                                  * We do not have the remote ref, or
1878                                  * we know that the remote ref is not
1879                                  * an ancestor of what we are trying to
1880                                  * push.  Either way this can be losing
1881                                  * commits at the remote end and likely
1882                                  * we were not up to date to begin with.
1883                                  */
1884                                 error("remote '%s' is not an ancestor of\n"
1885                                       "local '%s'.\n"
1886                                       "Maybe you are not up-to-date and "
1887                                       "need to pull first?",
1888                                       ref->name,
1889                                       ref->peer_ref->name);
1890                                 if (helper_status)
1891                                         printf("error %s non-fast forward\n", ref->name);
1892                                 rc = -2;
1893                                 continue;
1894                         }
1895                 }
1896                 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1897                 new_refs++;
1898
1899                 fprintf(stderr, "updating '%s'", ref->name);
1900                 if (strcmp(ref->name, ref->peer_ref->name))
1901                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
1902                 fprintf(stderr, "\n  from %s\n  to   %s\n",
1903                         oid_to_hex(&ref->old_oid), oid_to_hex(&ref->new_oid));
1904                 if (dry_run) {
1905                         if (helper_status)
1906                                 printf("ok %s\n", ref->name);
1907                         continue;
1908                 }
1909
1910                 /* Lock remote branch ref */
1911                 ref_lock = lock_remote(ref->name, LOCK_TIME);
1912                 if (ref_lock == NULL) {
1913                         fprintf(stderr, "Unable to lock remote branch %s\n",
1914                                 ref->name);
1915                         if (helper_status)
1916                                 printf("error %s lock error\n", ref->name);
1917                         rc = 1;
1918                         continue;
1919                 }
1920
1921                 /* Set up revision info for this refspec */
1922                 argv_array_push(&commit_argv, ""); /* ignored */
1923                 argv_array_push(&commit_argv, "--objects");
1924                 argv_array_push(&commit_argv, oid_to_hex(&ref->new_oid));
1925                 if (!push_all && !is_null_oid(&ref->old_oid))
1926                         argv_array_pushf(&commit_argv, "^%s",
1927                                          oid_to_hex(&ref->old_oid));
1928                 repo_init_revisions(the_repository, &revs, setup_git_directory());
1929                 setup_revisions(commit_argv.argc, commit_argv.argv, &revs, NULL);
1930                 revs.edge_hint = 0; /* just in case */
1931
1932                 /* Generate a list of objects that need to be pushed */
1933                 pushing = 0;
1934                 if (prepare_revision_walk(&revs))
1935                         die("revision walk setup failed");
1936                 mark_edges_uninteresting(&revs, NULL);
1937                 objects_to_send = get_delta(&revs, ref_lock);
1938                 finish_all_active_slots();
1939
1940                 /* Push missing objects to remote, this would be a
1941                    convenient time to pack them first if appropriate. */
1942                 pushing = 1;
1943                 if (objects_to_send)
1944                         fprintf(stderr, "    sending %d objects\n",
1945                                 objects_to_send);
1946
1947                 run_request_queue();
1948
1949                 /* Update the remote branch if all went well */
1950                 if (aborted || !update_remote(ref->new_oid.hash, ref_lock))
1951                         rc = 1;
1952
1953                 if (!rc)
1954                         fprintf(stderr, "    done\n");
1955                 if (helper_status)
1956                         printf("%s %s\n", !rc ? "ok" : "error", ref->name);
1957                 unlock_remote(ref_lock);
1958                 check_locks();
1959                 argv_array_clear(&commit_argv);
1960         }
1961
1962         /* Update remote server info if appropriate */
1963         if (repo->has_info_refs && new_refs) {
1964                 if (info_ref_lock && repo->can_update_info_refs) {
1965                         fprintf(stderr, "Updating remote server info\n");
1966                         if (!dry_run)
1967                                 update_remote_info_refs(info_ref_lock);
1968                 } else {
1969                         fprintf(stderr, "Unable to update server info\n");
1970                 }
1971         }
1972
1973  cleanup:
1974         if (info_ref_lock)
1975                 unlock_remote(info_ref_lock);
1976         free(repo);
1977
1978         http_cleanup();
1979
1980         request = request_queue_head;
1981         while (request != NULL) {
1982                 next_request = request->next;
1983                 release_request(request);
1984                 request = next_request;
1985         }
1986
1987         return rc;
1988 }