Merge branch 'ab/fetch-prune'
[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 #include "packfile.h"
15
16 #ifdef EXPAT_NEEDS_XMLPARSE_H
17 #include <xmlparse.h>
18 #else
19 #include <expat.h>
20 #endif
21
22 static const char http_push_usage[] =
23 "git http-push [--all] [--dry-run] [--force] [--verbose] <remote> [<head>...]\n";
24
25 #ifndef XML_STATUS_OK
26 enum XML_Status {
27   XML_STATUS_OK = 1,
28   XML_STATUS_ERROR = 0
29 };
30 #define XML_STATUS_OK    1
31 #define XML_STATUS_ERROR 0
32 #endif
33
34 #define PREV_BUF_SIZE 4096
35
36 /* DAV methods */
37 #define DAV_LOCK "LOCK"
38 #define DAV_MKCOL "MKCOL"
39 #define DAV_MOVE "MOVE"
40 #define DAV_PROPFIND "PROPFIND"
41 #define DAV_PUT "PUT"
42 #define DAV_UNLOCK "UNLOCK"
43 #define DAV_DELETE "DELETE"
44
45 /* DAV lock flags */
46 #define DAV_PROP_LOCKWR (1u << 0)
47 #define DAV_PROP_LOCKEX (1u << 1)
48 #define DAV_LOCK_OK (1u << 2)
49
50 /* DAV XML properties */
51 #define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
52 #define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
53 #define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
54 #define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
55 #define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
56 #define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
57 #define DAV_PROPFIND_RESP ".multistatus.response"
58 #define DAV_PROPFIND_NAME ".multistatus.response.href"
59 #define DAV_PROPFIND_COLLECTION ".multistatus.response.propstat.prop.resourcetype.collection"
60
61 /* DAV request body templates */
62 #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>"
63 #define PROPFIND_ALL_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/>\n</D:propfind>"
64 #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>"
65
66 #define LOCK_TIME 600
67 #define LOCK_REFRESH 30
68
69 /* Remember to update object flag allocation in object.h */
70 #define LOCAL    (1u<<16)
71 #define REMOTE   (1u<<17)
72 #define FETCHING (1u<<18)
73 #define PUSHING  (1u<<19)
74
75 /* We allow "recursive" symbolic refs. Only within reason, though */
76 #define MAXDEPTH 5
77
78 static int pushing;
79 static int aborted;
80 static signed char remote_dir_exists[256];
81
82 static int push_verbosely;
83 static int push_all = MATCH_REFS_NONE;
84 static int force_all;
85 static int dry_run;
86 static int helper_status;
87
88 static struct object_list *objects;
89
90 struct repo {
91         char *url;
92         char *path;
93         int path_len;
94         int has_info_refs;
95         int can_update_info_refs;
96         int has_info_packs;
97         struct packed_git *packs;
98         struct remote_lock *locks;
99 };
100
101 static struct repo *repo;
102
103 enum transfer_state {
104         NEED_FETCH,
105         RUN_FETCH_LOOSE,
106         RUN_FETCH_PACKED,
107         NEED_PUSH,
108         RUN_MKCOL,
109         RUN_PUT,
110         RUN_MOVE,
111         ABORTED,
112         COMPLETE
113 };
114
115 struct transfer_request {
116         struct object *obj;
117         char *url;
118         char *dest;
119         struct remote_lock *lock;
120         struct curl_slist *headers;
121         struct buffer buffer;
122         enum transfer_state state;
123         CURLcode curl_result;
124         char errorstr[CURL_ERROR_SIZE];
125         long http_code;
126         void *userData;
127         struct active_request_slot *slot;
128         struct transfer_request *next;
129 };
130
131 static struct transfer_request *request_queue_head;
132
133 struct xml_ctx {
134         char *name;
135         int len;
136         char *cdata;
137         void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
138         void *userData;
139 };
140
141 struct remote_lock {
142         char *url;
143         char *owner;
144         char *token;
145         char tmpfile_suffix[41];
146         time_t start_time;
147         long timeout;
148         int refreshing;
149         struct remote_lock *next;
150 };
151
152 /* Flags that control remote_ls processing */
153 #define PROCESS_FILES (1u << 0)
154 #define PROCESS_DIRS  (1u << 1)
155 #define RECURSIVE     (1u << 2)
156
157 /* Flags that remote_ls passes to callback functions */
158 #define IS_DIR (1u << 0)
159
160 struct remote_ls_ctx {
161         char *path;
162         void (*userFunc)(struct remote_ls_ctx *ls);
163         void *userData;
164         int flags;
165         char *dentry_name;
166         int dentry_flags;
167         struct remote_ls_ctx *parent;
168 };
169
170 /* get_dav_token_headers options */
171 enum dav_header_flag {
172         DAV_HEADER_IF = (1u << 0),
173         DAV_HEADER_LOCK = (1u << 1),
174         DAV_HEADER_TIMEOUT = (1u << 2)
175 };
176
177 static char *xml_entities(const char *s)
178 {
179         struct strbuf buf = STRBUF_INIT;
180         strbuf_addstr_xml_quoted(&buf, s);
181         return strbuf_detach(&buf, NULL);
182 }
183
184 static void curl_setup_http_get(CURL *curl, const char *url,
185                 const char *custom_req)
186 {
187         curl_easy_setopt(curl, CURLOPT_HTTPGET, 1);
188         curl_easy_setopt(curl, CURLOPT_URL, url);
189         curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, custom_req);
190         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_null);
191 }
192
193 static void curl_setup_http(CURL *curl, const char *url,
194                 const char *custom_req, struct buffer *buffer,
195                 curl_write_callback write_fn)
196 {
197         curl_easy_setopt(curl, CURLOPT_PUT, 1);
198         curl_easy_setopt(curl, CURLOPT_URL, url);
199         curl_easy_setopt(curl, CURLOPT_INFILE, buffer);
200         curl_easy_setopt(curl, CURLOPT_INFILESIZE, buffer->buf.len);
201         curl_easy_setopt(curl, CURLOPT_READFUNCTION, fread_buffer);
202 #ifndef NO_CURL_IOCTL
203         curl_easy_setopt(curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
204         curl_easy_setopt(curl, CURLOPT_IOCTLDATA, buffer);
205 #endif
206         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_fn);
207         curl_easy_setopt(curl, CURLOPT_NOBODY, 0);
208         curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, custom_req);
209         curl_easy_setopt(curl, CURLOPT_UPLOAD, 1);
210 }
211
212 static struct curl_slist *get_dav_token_headers(struct remote_lock *lock, enum dav_header_flag options)
213 {
214         struct strbuf buf = STRBUF_INIT;
215         struct curl_slist *dav_headers = http_copy_default_headers();
216
217         if (options & DAV_HEADER_IF) {
218                 strbuf_addf(&buf, "If: (<%s>)", lock->token);
219                 dav_headers = curl_slist_append(dav_headers, buf.buf);
220                 strbuf_reset(&buf);
221         }
222         if (options & DAV_HEADER_LOCK) {
223                 strbuf_addf(&buf, "Lock-Token: <%s>", lock->token);
224                 dav_headers = curl_slist_append(dav_headers, buf.buf);
225                 strbuf_reset(&buf);
226         }
227         if (options & DAV_HEADER_TIMEOUT) {
228                 strbuf_addf(&buf, "Timeout: Second-%ld", lock->timeout);
229                 dav_headers = curl_slist_append(dav_headers, buf.buf);
230                 strbuf_reset(&buf);
231         }
232         strbuf_release(&buf);
233
234         return dav_headers;
235 }
236
237 static void finish_request(struct transfer_request *request);
238 static void release_request(struct transfer_request *request);
239
240 static void process_response(void *callback_data)
241 {
242         struct transfer_request *request =
243                 (struct transfer_request *)callback_data;
244
245         finish_request(request);
246 }
247
248 #ifdef USE_CURL_MULTI
249
250 static void start_fetch_loose(struct transfer_request *request)
251 {
252         struct active_request_slot *slot;
253         struct http_object_request *obj_req;
254
255         obj_req = new_http_object_request(repo->url, request->obj->oid.hash);
256         if (obj_req == NULL) {
257                 request->state = ABORTED;
258                 return;
259         }
260
261         slot = obj_req->slot;
262         slot->callback_func = process_response;
263         slot->callback_data = request;
264         request->slot = slot;
265         request->userData = obj_req;
266
267         /* Try to get the request started, abort the request on error */
268         request->state = RUN_FETCH_LOOSE;
269         if (!start_active_slot(slot)) {
270                 fprintf(stderr, "Unable to start GET request\n");
271                 repo->can_update_info_refs = 0;
272                 release_http_object_request(obj_req);
273                 release_request(request);
274         }
275 }
276
277 static void start_mkcol(struct transfer_request *request)
278 {
279         char *hex = oid_to_hex(&request->obj->oid);
280         struct active_request_slot *slot;
281
282         request->url = get_remote_object_url(repo->url, hex, 1);
283
284         slot = get_active_slot();
285         slot->callback_func = process_response;
286         slot->callback_data = request;
287         curl_setup_http_get(slot->curl, request->url, DAV_MKCOL);
288         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
289
290         if (start_active_slot(slot)) {
291                 request->slot = slot;
292                 request->state = RUN_MKCOL;
293         } else {
294                 request->state = ABORTED;
295                 FREE_AND_NULL(request->url);
296         }
297 }
298 #endif
299
300 static void start_fetch_packed(struct transfer_request *request)
301 {
302         struct packed_git *target;
303
304         struct transfer_request *check_request = request_queue_head;
305         struct http_pack_request *preq;
306
307         target = find_sha1_pack(request->obj->oid.hash, repo->packs);
308         if (!target) {
309                 fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", oid_to_hex(&request->obj->oid));
310                 repo->can_update_info_refs = 0;
311                 release_request(request);
312                 return;
313         }
314
315         fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
316         fprintf(stderr, " which contains %s\n", oid_to_hex(&request->obj->oid));
317
318         preq = new_http_pack_request(target, repo->url);
319         if (preq == NULL) {
320                 repo->can_update_info_refs = 0;
321                 return;
322         }
323         preq->lst = &repo->packs;
324
325         /* Make sure there isn't another open request for this pack */
326         while (check_request) {
327                 if (check_request->state == RUN_FETCH_PACKED &&
328                     !strcmp(check_request->url, preq->url)) {
329                         release_http_pack_request(preq);
330                         release_request(request);
331                         return;
332                 }
333                 check_request = check_request->next;
334         }
335
336         preq->slot->callback_func = process_response;
337         preq->slot->callback_data = request;
338         request->slot = preq->slot;
339         request->userData = preq;
340
341         /* Try to get the request started, abort the request on error */
342         request->state = RUN_FETCH_PACKED;
343         if (!start_active_slot(preq->slot)) {
344                 fprintf(stderr, "Unable to start GET request\n");
345                 release_http_pack_request(preq);
346                 repo->can_update_info_refs = 0;
347                 release_request(request);
348         }
349 }
350
351 static void start_put(struct transfer_request *request)
352 {
353         char *hex = oid_to_hex(&request->obj->oid);
354         struct active_request_slot *slot;
355         struct strbuf buf = STRBUF_INIT;
356         enum object_type type;
357         char hdr[50];
358         void *unpacked;
359         unsigned long len;
360         int hdrlen;
361         ssize_t size;
362         git_zstream stream;
363
364         unpacked = read_sha1_file(request->obj->oid.hash, &type, &len);
365         hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(type), len) + 1;
366
367         /* Set it up */
368         git_deflate_init(&stream, zlib_compression_level);
369         size = git_deflate_bound(&stream, len + hdrlen);
370         strbuf_init(&request->buffer.buf, size);
371         request->buffer.posn = 0;
372
373         /* Compress it */
374         stream.next_out = (unsigned char *)request->buffer.buf.buf;
375         stream.avail_out = size;
376
377         /* First header.. */
378         stream.next_in = (void *)hdr;
379         stream.avail_in = hdrlen;
380         while (git_deflate(&stream, 0) == Z_OK)
381                 ; /* nothing */
382
383         /* Then the data itself.. */
384         stream.next_in = unpacked;
385         stream.avail_in = len;
386         while (git_deflate(&stream, Z_FINISH) == Z_OK)
387                 ; /* nothing */
388         git_deflate_end(&stream);
389         free(unpacked);
390
391         request->buffer.buf.len = stream.total_out;
392
393         strbuf_addstr(&buf, "Destination: ");
394         append_remote_object_url(&buf, repo->url, hex, 0);
395         request->dest = strbuf_detach(&buf, NULL);
396
397         append_remote_object_url(&buf, repo->url, hex, 0);
398         strbuf_add(&buf, request->lock->tmpfile_suffix, 41);
399         request->url = strbuf_detach(&buf, NULL);
400
401         slot = get_active_slot();
402         slot->callback_func = process_response;
403         slot->callback_data = request;
404         curl_setup_http(slot->curl, request->url, DAV_PUT,
405                         &request->buffer, fwrite_null);
406
407         if (start_active_slot(slot)) {
408                 request->slot = slot;
409                 request->state = RUN_PUT;
410         } else {
411                 request->state = ABORTED;
412                 FREE_AND_NULL(request->url);
413         }
414 }
415
416 static void start_move(struct transfer_request *request)
417 {
418         struct active_request_slot *slot;
419         struct curl_slist *dav_headers = http_copy_default_headers();
420
421         slot = get_active_slot();
422         slot->callback_func = process_response;
423         slot->callback_data = request;
424         curl_setup_http_get(slot->curl, request->url, DAV_MOVE);
425         dav_headers = curl_slist_append(dav_headers, request->dest);
426         dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
427         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
428
429         if (start_active_slot(slot)) {
430                 request->slot = slot;
431                 request->state = RUN_MOVE;
432         } else {
433                 request->state = ABORTED;
434                 FREE_AND_NULL(request->url);
435         }
436 }
437
438 static int refresh_lock(struct remote_lock *lock)
439 {
440         struct active_request_slot *slot;
441         struct slot_results results;
442         struct curl_slist *dav_headers;
443         int rc = 0;
444
445         lock->refreshing = 1;
446
447         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF | DAV_HEADER_TIMEOUT);
448
449         slot = get_active_slot();
450         slot->results = &results;
451         curl_setup_http_get(slot->curl, lock->url, DAV_LOCK);
452         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
453
454         if (start_active_slot(slot)) {
455                 run_active_slot(slot);
456                 if (results.curl_result != CURLE_OK) {
457                         fprintf(stderr, "LOCK HTTP error %ld\n",
458                                 results.http_code);
459                 } else {
460                         lock->start_time = time(NULL);
461                         rc = 1;
462                 }
463         }
464
465         lock->refreshing = 0;
466         curl_slist_free_all(dav_headers);
467
468         return rc;
469 }
470
471 static void check_locks(void)
472 {
473         struct remote_lock *lock = repo->locks;
474         time_t current_time = time(NULL);
475         int time_remaining;
476
477         while (lock) {
478                 time_remaining = lock->start_time + lock->timeout -
479                         current_time;
480                 if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
481                         if (!refresh_lock(lock)) {
482                                 fprintf(stderr,
483                                         "Unable to refresh lock for %s\n",
484                                         lock->url);
485                                 aborted = 1;
486                                 return;
487                         }
488                 }
489                 lock = lock->next;
490         }
491 }
492
493 static void release_request(struct transfer_request *request)
494 {
495         struct transfer_request *entry = request_queue_head;
496
497         if (request == request_queue_head) {
498                 request_queue_head = request->next;
499         } else {
500                 while (entry->next != NULL && entry->next != request)
501                         entry = entry->next;
502                 if (entry->next == request)
503                         entry->next = entry->next->next;
504         }
505
506         free(request->url);
507         free(request);
508 }
509
510 static void finish_request(struct transfer_request *request)
511 {
512         struct http_pack_request *preq;
513         struct http_object_request *obj_req;
514
515         request->curl_result = request->slot->curl_result;
516         request->http_code = request->slot->http_code;
517         request->slot = NULL;
518
519         /* Keep locks active */
520         check_locks();
521
522         if (request->headers != NULL)
523                 curl_slist_free_all(request->headers);
524
525         /* URL is reused for MOVE after PUT */
526         if (request->state != RUN_PUT) {
527                 FREE_AND_NULL(request->url);
528         }
529
530         if (request->state == RUN_MKCOL) {
531                 if (request->curl_result == CURLE_OK ||
532                     request->http_code == 405) {
533                         remote_dir_exists[request->obj->oid.hash[0]] = 1;
534                         start_put(request);
535                 } else {
536                         fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
537                                 oid_to_hex(&request->obj->oid),
538                                 request->curl_result, request->http_code);
539                         request->state = ABORTED;
540                         aborted = 1;
541                 }
542         } else if (request->state == RUN_PUT) {
543                 if (request->curl_result == CURLE_OK) {
544                         start_move(request);
545                 } else {
546                         fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
547                                 oid_to_hex(&request->obj->oid),
548                                 request->curl_result, request->http_code);
549                         request->state = ABORTED;
550                         aborted = 1;
551                 }
552         } else if (request->state == RUN_MOVE) {
553                 if (request->curl_result == CURLE_OK) {
554                         if (push_verbosely)
555                                 fprintf(stderr, "    sent %s\n",
556                                         oid_to_hex(&request->obj->oid));
557                         request->obj->flags |= REMOTE;
558                         release_request(request);
559                 } else {
560                         fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
561                                 oid_to_hex(&request->obj->oid),
562                                 request->curl_result, request->http_code);
563                         request->state = ABORTED;
564                         aborted = 1;
565                 }
566         } else if (request->state == RUN_FETCH_LOOSE) {
567                 obj_req = (struct http_object_request *)request->userData;
568
569                 if (finish_http_object_request(obj_req) == 0)
570                         if (obj_req->rename == 0)
571                                 request->obj->flags |= (LOCAL | REMOTE);
572
573                 /* Try fetching packed if necessary */
574                 if (request->obj->flags & LOCAL) {
575                         release_http_object_request(obj_req);
576                         release_request(request);
577                 } else
578                         start_fetch_packed(request);
579
580         } else if (request->state == RUN_FETCH_PACKED) {
581                 int fail = 1;
582                 if (request->curl_result != CURLE_OK) {
583                         fprintf(stderr, "Unable to get pack file %s\n%s",
584                                 request->url, curl_errorstr);
585                 } else {
586                         preq = (struct http_pack_request *)request->userData;
587
588                         if (preq) {
589                                 if (finish_http_pack_request(preq) == 0)
590                                         fail = 0;
591                                 release_http_pack_request(preq);
592                         }
593                 }
594                 if (fail)
595                         repo->can_update_info_refs = 0;
596                 release_request(request);
597         }
598 }
599
600 #ifdef USE_CURL_MULTI
601 static int is_running_queue;
602 static int fill_active_slot(void *unused)
603 {
604         struct transfer_request *request;
605
606         if (aborted || !is_running_queue)
607                 return 0;
608
609         for (request = request_queue_head; request; request = request->next) {
610                 if (request->state == NEED_FETCH) {
611                         start_fetch_loose(request);
612                         return 1;
613                 } else if (pushing && request->state == NEED_PUSH) {
614                         if (remote_dir_exists[request->obj->oid.hash[0]] == 1) {
615                                 start_put(request);
616                         } else {
617                                 start_mkcol(request);
618                         }
619                         return 1;
620                 }
621         }
622         return 0;
623 }
624 #endif
625
626 static void get_remote_object_list(unsigned char parent);
627
628 static void add_fetch_request(struct object *obj)
629 {
630         struct transfer_request *request;
631
632         check_locks();
633
634         /*
635          * Don't fetch the object if it's known to exist locally
636          * or is already in the request queue
637          */
638         if (remote_dir_exists[obj->oid.hash[0]] == -1)
639                 get_remote_object_list(obj->oid.hash[0]);
640         if (obj->flags & (LOCAL | FETCHING))
641                 return;
642
643         obj->flags |= FETCHING;
644         request = xmalloc(sizeof(*request));
645         request->obj = obj;
646         request->url = NULL;
647         request->lock = NULL;
648         request->headers = NULL;
649         request->state = NEED_FETCH;
650         request->next = request_queue_head;
651         request_queue_head = request;
652
653 #ifdef USE_CURL_MULTI
654         fill_active_slots();
655         step_active_slots();
656 #endif
657 }
658
659 static int add_send_request(struct object *obj, struct remote_lock *lock)
660 {
661         struct transfer_request *request;
662         struct packed_git *target;
663
664         /* Keep locks active */
665         check_locks();
666
667         /*
668          * Don't push the object if it's known to exist on the remote
669          * or is already in the request queue
670          */
671         if (remote_dir_exists[obj->oid.hash[0]] == -1)
672                 get_remote_object_list(obj->oid.hash[0]);
673         if (obj->flags & (REMOTE | PUSHING))
674                 return 0;
675         target = find_sha1_pack(obj->oid.hash, repo->packs);
676         if (target) {
677                 obj->flags |= REMOTE;
678                 return 0;
679         }
680
681         obj->flags |= PUSHING;
682         request = xmalloc(sizeof(*request));
683         request->obj = obj;
684         request->url = NULL;
685         request->lock = lock;
686         request->headers = NULL;
687         request->state = NEED_PUSH;
688         request->next = request_queue_head;
689         request_queue_head = request;
690
691 #ifdef USE_CURL_MULTI
692         fill_active_slots();
693         step_active_slots();
694 #endif
695
696         return 1;
697 }
698
699 static int fetch_indices(void)
700 {
701         int ret;
702
703         if (push_verbosely)
704                 fprintf(stderr, "Getting pack list\n");
705
706         switch (http_get_info_packs(repo->url, &repo->packs)) {
707         case HTTP_OK:
708         case HTTP_MISSING_TARGET:
709                 ret = 0;
710                 break;
711         default:
712                 ret = -1;
713         }
714
715         return ret;
716 }
717
718 static void one_remote_object(const struct object_id *oid)
719 {
720         struct object *obj;
721
722         obj = lookup_object(oid->hash);
723         if (!obj)
724                 obj = parse_object(oid);
725
726         /* Ignore remote objects that don't exist locally */
727         if (!obj)
728                 return;
729
730         obj->flags |= REMOTE;
731         if (!object_list_contains(objects, obj))
732                 object_list_insert(obj, &objects);
733 }
734
735 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
736 {
737         int *lock_flags = (int *)ctx->userData;
738
739         if (tag_closed) {
740                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
741                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
742                             (*lock_flags & DAV_PROP_LOCKWR)) {
743                                 *lock_flags |= DAV_LOCK_OK;
744                         }
745                         *lock_flags &= DAV_LOCK_OK;
746                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
747                         *lock_flags |= DAV_PROP_LOCKWR;
748                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
749                         *lock_flags |= DAV_PROP_LOCKEX;
750                 }
751         }
752 }
753
754 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
755 {
756         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
757         git_SHA_CTX sha_ctx;
758         unsigned char lock_token_sha1[20];
759
760         if (tag_closed && ctx->cdata) {
761                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
762                         lock->owner = xstrdup(ctx->cdata);
763                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
764                         const char *arg;
765                         if (skip_prefix(ctx->cdata, "Second-", &arg))
766                                 lock->timeout = strtol(arg, NULL, 10);
767                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
768                         lock->token = xstrdup(ctx->cdata);
769
770                         git_SHA1_Init(&sha_ctx);
771                         git_SHA1_Update(&sha_ctx, lock->token, strlen(lock->token));
772                         git_SHA1_Final(lock_token_sha1, &sha_ctx);
773
774                         lock->tmpfile_suffix[0] = '_';
775                         memcpy(lock->tmpfile_suffix + 1, sha1_to_hex(lock_token_sha1), 40);
776                 }
777         }
778 }
779
780 static void one_remote_ref(const char *refname);
781
782 static void
783 xml_start_tag(void *userData, const char *name, const char **atts)
784 {
785         struct xml_ctx *ctx = (struct xml_ctx *)userData;
786         const char *c = strchr(name, ':');
787         int old_namelen, new_len;
788
789         if (c == NULL)
790                 c = name;
791         else
792                 c++;
793
794         old_namelen = strlen(ctx->name);
795         new_len = old_namelen + strlen(c) + 2;
796
797         if (new_len > ctx->len) {
798                 ctx->name = xrealloc(ctx->name, new_len);
799                 ctx->len = new_len;
800         }
801         xsnprintf(ctx->name + old_namelen, ctx->len - old_namelen, ".%s", c);
802
803         FREE_AND_NULL(ctx->cdata);
804
805         ctx->userFunc(ctx, 0);
806 }
807
808 static void
809 xml_end_tag(void *userData, const char *name)
810 {
811         struct xml_ctx *ctx = (struct xml_ctx *)userData;
812         const char *c = strchr(name, ':');
813         char *ep;
814
815         ctx->userFunc(ctx, 1);
816
817         if (c == NULL)
818                 c = name;
819         else
820                 c++;
821
822         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
823         *ep = 0;
824 }
825
826 static void
827 xml_cdata(void *userData, const XML_Char *s, int len)
828 {
829         struct xml_ctx *ctx = (struct xml_ctx *)userData;
830         free(ctx->cdata);
831         ctx->cdata = xmemdupz(s, len);
832 }
833
834 static struct remote_lock *lock_remote(const char *path, long timeout)
835 {
836         struct active_request_slot *slot;
837         struct slot_results results;
838         struct buffer out_buffer = { STRBUF_INIT, 0 };
839         struct strbuf in_buffer = STRBUF_INIT;
840         char *url;
841         char *ep;
842         char timeout_header[25];
843         struct remote_lock *lock = NULL;
844         struct curl_slist *dav_headers = http_copy_default_headers();
845         struct xml_ctx ctx;
846         char *escaped;
847
848         url = xstrfmt("%s%s", repo->url, path);
849
850         /* Make sure leading directories exist for the remote ref */
851         ep = strchr(url + strlen(repo->url) + 1, '/');
852         while (ep) {
853                 char saved_character = ep[1];
854                 ep[1] = '\0';
855                 slot = get_active_slot();
856                 slot->results = &results;
857                 curl_setup_http_get(slot->curl, url, DAV_MKCOL);
858                 if (start_active_slot(slot)) {
859                         run_active_slot(slot);
860                         if (results.curl_result != CURLE_OK &&
861                             results.http_code != 405) {
862                                 fprintf(stderr,
863                                         "Unable to create branch path %s\n",
864                                         url);
865                                 free(url);
866                                 return NULL;
867                         }
868                 } else {
869                         fprintf(stderr, "Unable to start MKCOL request\n");
870                         free(url);
871                         return NULL;
872                 }
873                 ep[1] = saved_character;
874                 ep = strchr(ep + 1, '/');
875         }
876
877         escaped = xml_entities(ident_default_email());
878         strbuf_addf(&out_buffer.buf, LOCK_REQUEST, escaped);
879         free(escaped);
880
881         xsnprintf(timeout_header, sizeof(timeout_header), "Timeout: Second-%ld", timeout);
882         dav_headers = curl_slist_append(dav_headers, timeout_header);
883         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
884
885         slot = get_active_slot();
886         slot->results = &results;
887         curl_setup_http(slot->curl, url, DAV_LOCK, &out_buffer, fwrite_buffer);
888         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
889         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
890
891         lock = xcalloc(1, sizeof(*lock));
892         lock->timeout = -1;
893
894         if (start_active_slot(slot)) {
895                 run_active_slot(slot);
896                 if (results.curl_result == CURLE_OK) {
897                         XML_Parser parser = XML_ParserCreate(NULL);
898                         enum XML_Status result;
899                         ctx.name = xcalloc(10, 1);
900                         ctx.len = 0;
901                         ctx.cdata = NULL;
902                         ctx.userFunc = handle_new_lock_ctx;
903                         ctx.userData = lock;
904                         XML_SetUserData(parser, &ctx);
905                         XML_SetElementHandler(parser, xml_start_tag,
906                                               xml_end_tag);
907                         XML_SetCharacterDataHandler(parser, xml_cdata);
908                         result = XML_Parse(parser, in_buffer.buf,
909                                            in_buffer.len, 1);
910                         free(ctx.name);
911                         if (result != XML_STATUS_OK) {
912                                 fprintf(stderr, "XML error: %s\n",
913                                         XML_ErrorString(
914                                                 XML_GetErrorCode(parser)));
915                                 lock->timeout = -1;
916                         }
917                         XML_ParserFree(parser);
918                 } else {
919                         fprintf(stderr,
920                                 "error: curl result=%d, HTTP code=%ld\n",
921                                 results.curl_result, results.http_code);
922                 }
923         } else {
924                 fprintf(stderr, "Unable to start LOCK request\n");
925         }
926
927         curl_slist_free_all(dav_headers);
928         strbuf_release(&out_buffer.buf);
929         strbuf_release(&in_buffer);
930
931         if (lock->token == NULL || lock->timeout <= 0) {
932                 free(lock->token);
933                 free(lock->owner);
934                 free(url);
935                 FREE_AND_NULL(lock);
936         } else {
937                 lock->url = url;
938                 lock->start_time = time(NULL);
939                 lock->next = repo->locks;
940                 repo->locks = lock;
941         }
942
943         return lock;
944 }
945
946 static int unlock_remote(struct remote_lock *lock)
947 {
948         struct active_request_slot *slot;
949         struct slot_results results;
950         struct remote_lock *prev = repo->locks;
951         struct curl_slist *dav_headers;
952         int rc = 0;
953
954         dav_headers = get_dav_token_headers(lock, DAV_HEADER_LOCK);
955
956         slot = get_active_slot();
957         slot->results = &results;
958         curl_setup_http_get(slot->curl, lock->url, DAV_UNLOCK);
959         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
960
961         if (start_active_slot(slot)) {
962                 run_active_slot(slot);
963                 if (results.curl_result == CURLE_OK)
964                         rc = 1;
965                 else
966                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
967                                 results.http_code);
968         } else {
969                 fprintf(stderr, "Unable to start UNLOCK request\n");
970         }
971
972         curl_slist_free_all(dav_headers);
973
974         if (repo->locks == lock) {
975                 repo->locks = lock->next;
976         } else {
977                 while (prev && prev->next != lock)
978                         prev = prev->next;
979                 if (prev)
980                         prev->next = prev->next->next;
981         }
982
983         free(lock->owner);
984         free(lock->url);
985         free(lock->token);
986         free(lock);
987
988         return rc;
989 }
990
991 static void remove_locks(void)
992 {
993         struct remote_lock *lock = repo->locks;
994
995         fprintf(stderr, "Removing remote locks...\n");
996         while (lock) {
997                 struct remote_lock *next = lock->next;
998                 unlock_remote(lock);
999                 lock = next;
1000         }
1001 }
1002
1003 static void remove_locks_on_signal(int signo)
1004 {
1005         remove_locks();
1006         sigchain_pop(signo);
1007         raise(signo);
1008 }
1009
1010 static void remote_ls(const char *path, int flags,
1011                       void (*userFunc)(struct remote_ls_ctx *ls),
1012                       void *userData);
1013
1014 /* extract hex from sharded "xx/x{38}" filename */
1015 static int get_oid_hex_from_objpath(const char *path, struct object_id *oid)
1016 {
1017         if (strlen(path) != GIT_SHA1_HEXSZ + 1)
1018                 return -1;
1019
1020         if (hex_to_bytes(oid->hash, path, 1))
1021                 return -1;
1022         path += 2;
1023         path++; /* skip '/' */
1024
1025         return hex_to_bytes(oid->hash + 1, path, GIT_SHA1_RAWSZ - 1);
1026 }
1027
1028 static void process_ls_object(struct remote_ls_ctx *ls)
1029 {
1030         unsigned int *parent = (unsigned int *)ls->userData;
1031         const char *path = ls->dentry_name;
1032         struct object_id oid;
1033
1034         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1035                 remote_dir_exists[*parent] = 1;
1036                 return;
1037         }
1038
1039         if (!skip_prefix(path, "objects/", &path) ||
1040             get_oid_hex_from_objpath(path, &oid))
1041                 return;
1042
1043         one_remote_object(&oid);
1044 }
1045
1046 static void process_ls_ref(struct remote_ls_ctx *ls)
1047 {
1048         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1049                 fprintf(stderr, "  %s\n", ls->dentry_name);
1050                 return;
1051         }
1052
1053         if (!(ls->dentry_flags & IS_DIR))
1054                 one_remote_ref(ls->dentry_name);
1055 }
1056
1057 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1058 {
1059         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1060
1061         if (tag_closed) {
1062                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1063                         if (ls->dentry_flags & IS_DIR) {
1064
1065                                 /* ensure collection names end with slash */
1066                                 str_end_url_with_slash(ls->dentry_name, &ls->dentry_name);
1067
1068                                 if (ls->flags & PROCESS_DIRS) {
1069                                         ls->userFunc(ls);
1070                                 }
1071                                 if (strcmp(ls->dentry_name, ls->path) &&
1072                                     ls->flags & RECURSIVE) {
1073                                         remote_ls(ls->dentry_name,
1074                                                   ls->flags,
1075                                                   ls->userFunc,
1076                                                   ls->userData);
1077                                 }
1078                         } else if (ls->flags & PROCESS_FILES) {
1079                                 ls->userFunc(ls);
1080                         }
1081                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1082                         char *path = ctx->cdata;
1083                         if (*ctx->cdata == 'h') {
1084                                 path = strstr(path, "//");
1085                                 if (path) {
1086                                         path = strchr(path+2, '/');
1087                                 }
1088                         }
1089                         if (path) {
1090                                 const char *url = repo->url;
1091                                 if (repo->path)
1092                                         url = repo->path;
1093                                 if (strncmp(path, url, repo->path_len))
1094                                         error("Parsed path '%s' does not match url: '%s'",
1095                                               path, url);
1096                                 else {
1097                                         path += repo->path_len;
1098                                         ls->dentry_name = xstrdup(path);
1099                                 }
1100                         }
1101                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1102                         ls->dentry_flags |= IS_DIR;
1103                 }
1104         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1105                 FREE_AND_NULL(ls->dentry_name);
1106                 ls->dentry_flags = 0;
1107         }
1108 }
1109
1110 /*
1111  * NEEDSWORK: remote_ls() ignores info/refs on the remote side.  But it
1112  * should _only_ heed the information from that file, instead of trying to
1113  * determine the refs from the remote file system (badly: it does not even
1114  * know about packed-refs).
1115  */
1116 static void remote_ls(const char *path, int flags,
1117                       void (*userFunc)(struct remote_ls_ctx *ls),
1118                       void *userData)
1119 {
1120         char *url = xstrfmt("%s%s", repo->url, path);
1121         struct active_request_slot *slot;
1122         struct slot_results results;
1123         struct strbuf in_buffer = STRBUF_INIT;
1124         struct buffer out_buffer = { STRBUF_INIT, 0 };
1125         struct curl_slist *dav_headers = http_copy_default_headers();
1126         struct xml_ctx ctx;
1127         struct remote_ls_ctx ls;
1128
1129         ls.flags = flags;
1130         ls.path = xstrdup(path);
1131         ls.dentry_name = NULL;
1132         ls.dentry_flags = 0;
1133         ls.userData = userData;
1134         ls.userFunc = userFunc;
1135
1136         strbuf_addstr(&out_buffer.buf, PROPFIND_ALL_REQUEST);
1137
1138         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1139         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1140
1141         slot = get_active_slot();
1142         slot->results = &results;
1143         curl_setup_http(slot->curl, url, DAV_PROPFIND,
1144                         &out_buffer, fwrite_buffer);
1145         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1146         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1147
1148         if (start_active_slot(slot)) {
1149                 run_active_slot(slot);
1150                 if (results.curl_result == CURLE_OK) {
1151                         XML_Parser parser = XML_ParserCreate(NULL);
1152                         enum XML_Status result;
1153                         ctx.name = xcalloc(10, 1);
1154                         ctx.len = 0;
1155                         ctx.cdata = NULL;
1156                         ctx.userFunc = handle_remote_ls_ctx;
1157                         ctx.userData = &ls;
1158                         XML_SetUserData(parser, &ctx);
1159                         XML_SetElementHandler(parser, xml_start_tag,
1160                                               xml_end_tag);
1161                         XML_SetCharacterDataHandler(parser, xml_cdata);
1162                         result = XML_Parse(parser, in_buffer.buf,
1163                                            in_buffer.len, 1);
1164                         free(ctx.name);
1165
1166                         if (result != XML_STATUS_OK) {
1167                                 fprintf(stderr, "XML error: %s\n",
1168                                         XML_ErrorString(
1169                                                 XML_GetErrorCode(parser)));
1170                         }
1171                         XML_ParserFree(parser);
1172                 }
1173         } else {
1174                 fprintf(stderr, "Unable to start PROPFIND request\n");
1175         }
1176
1177         free(ls.path);
1178         free(url);
1179         strbuf_release(&out_buffer.buf);
1180         strbuf_release(&in_buffer);
1181         curl_slist_free_all(dav_headers);
1182 }
1183
1184 static void get_remote_object_list(unsigned char parent)
1185 {
1186         char path[] = "objects/XX/";
1187         static const char hex[] = "0123456789abcdef";
1188         unsigned int val = parent;
1189
1190         path[8] = hex[val >> 4];
1191         path[9] = hex[val & 0xf];
1192         remote_dir_exists[val] = 0;
1193         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1194                   process_ls_object, &val);
1195 }
1196
1197 static int locking_available(void)
1198 {
1199         struct active_request_slot *slot;
1200         struct slot_results results;
1201         struct strbuf in_buffer = STRBUF_INIT;
1202         struct buffer out_buffer = { STRBUF_INIT, 0 };
1203         struct curl_slist *dav_headers = http_copy_default_headers();
1204         struct xml_ctx ctx;
1205         int lock_flags = 0;
1206         char *escaped;
1207
1208         escaped = xml_entities(repo->url);
1209         strbuf_addf(&out_buffer.buf, PROPFIND_SUPPORTEDLOCK_REQUEST, escaped);
1210         free(escaped);
1211
1212         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1213         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1214
1215         slot = get_active_slot();
1216         slot->results = &results;
1217         curl_setup_http(slot->curl, repo->url, DAV_PROPFIND,
1218                         &out_buffer, fwrite_buffer);
1219         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1220         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1221
1222         if (start_active_slot(slot)) {
1223                 run_active_slot(slot);
1224                 if (results.curl_result == CURLE_OK) {
1225                         XML_Parser parser = XML_ParserCreate(NULL);
1226                         enum XML_Status result;
1227                         ctx.name = xcalloc(10, 1);
1228                         ctx.len = 0;
1229                         ctx.cdata = NULL;
1230                         ctx.userFunc = handle_lockprop_ctx;
1231                         ctx.userData = &lock_flags;
1232                         XML_SetUserData(parser, &ctx);
1233                         XML_SetElementHandler(parser, xml_start_tag,
1234                                               xml_end_tag);
1235                         result = XML_Parse(parser, in_buffer.buf,
1236                                            in_buffer.len, 1);
1237                         free(ctx.name);
1238
1239                         if (result != XML_STATUS_OK) {
1240                                 fprintf(stderr, "XML error: %s\n",
1241                                         XML_ErrorString(
1242                                                 XML_GetErrorCode(parser)));
1243                                 lock_flags = 0;
1244                         }
1245                         XML_ParserFree(parser);
1246                         if (!lock_flags)
1247                                 error("no DAV locking support on %s",
1248                                       repo->url);
1249
1250                 } else {
1251                         error("Cannot access URL %s, return code %d",
1252                               repo->url, results.curl_result);
1253                         lock_flags = 0;
1254                 }
1255         } else {
1256                 error("Unable to start PROPFIND request on %s", repo->url);
1257         }
1258
1259         strbuf_release(&out_buffer.buf);
1260         strbuf_release(&in_buffer);
1261         curl_slist_free_all(dav_headers);
1262
1263         return lock_flags;
1264 }
1265
1266 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1267 {
1268         struct object_list *entry = xmalloc(sizeof(struct object_list));
1269         entry->item = obj;
1270         entry->next = *p;
1271         *p = entry;
1272         return &entry->next;
1273 }
1274
1275 static struct object_list **process_blob(struct blob *blob,
1276                                          struct object_list **p)
1277 {
1278         struct object *obj = &blob->object;
1279
1280         obj->flags |= LOCAL;
1281
1282         if (obj->flags & (UNINTERESTING | SEEN))
1283                 return p;
1284
1285         obj->flags |= SEEN;
1286         return add_one_object(obj, p);
1287 }
1288
1289 static struct object_list **process_tree(struct tree *tree,
1290                                          struct object_list **p)
1291 {
1292         struct object *obj = &tree->object;
1293         struct tree_desc desc;
1294         struct name_entry entry;
1295
1296         obj->flags |= LOCAL;
1297
1298         if (obj->flags & (UNINTERESTING | SEEN))
1299                 return p;
1300         if (parse_tree(tree) < 0)
1301                 die("bad tree object %s", oid_to_hex(&obj->oid));
1302
1303         obj->flags |= SEEN;
1304         p = add_one_object(obj, p);
1305
1306         init_tree_desc(&desc, tree->buffer, tree->size);
1307
1308         while (tree_entry(&desc, &entry))
1309                 switch (object_type(entry.mode)) {
1310                 case OBJ_TREE:
1311                         p = process_tree(lookup_tree(entry.oid), p);
1312                         break;
1313                 case OBJ_BLOB:
1314                         p = process_blob(lookup_blob(entry.oid), p);
1315                         break;
1316                 default:
1317                         /* Subproject commit - not in this repository */
1318                         break;
1319                 }
1320
1321         free_tree_buffer(tree);
1322         return p;
1323 }
1324
1325 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1326 {
1327         int i;
1328         struct commit *commit;
1329         struct object_list **p = &objects;
1330         int count = 0;
1331
1332         while ((commit = get_revision(revs)) != NULL) {
1333                 p = process_tree(commit->tree, p);
1334                 commit->object.flags |= LOCAL;
1335                 if (!(commit->object.flags & UNINTERESTING))
1336                         count += add_send_request(&commit->object, lock);
1337         }
1338
1339         for (i = 0; i < revs->pending.nr; i++) {
1340                 struct object_array_entry *entry = revs->pending.objects + i;
1341                 struct object *obj = entry->item;
1342                 const char *name = entry->name;
1343
1344                 if (obj->flags & (UNINTERESTING | SEEN))
1345                         continue;
1346                 if (obj->type == OBJ_TAG) {
1347                         obj->flags |= SEEN;
1348                         p = add_one_object(obj, p);
1349                         continue;
1350                 }
1351                 if (obj->type == OBJ_TREE) {
1352                         p = process_tree((struct tree *)obj, p);
1353                         continue;
1354                 }
1355                 if (obj->type == OBJ_BLOB) {
1356                         p = process_blob((struct blob *)obj, p);
1357                         continue;
1358                 }
1359                 die("unknown pending object %s (%s)", oid_to_hex(&obj->oid), name);
1360         }
1361
1362         while (objects) {
1363                 if (!(objects->item->flags & UNINTERESTING))
1364                         count += add_send_request(objects->item, lock);
1365                 objects = objects->next;
1366         }
1367
1368         return count;
1369 }
1370
1371 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1372 {
1373         struct active_request_slot *slot;
1374         struct slot_results results;
1375         struct buffer out_buffer = { STRBUF_INIT, 0 };
1376         struct curl_slist *dav_headers;
1377
1378         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1379
1380         strbuf_addf(&out_buffer.buf, "%s\n", sha1_to_hex(sha1));
1381
1382         slot = get_active_slot();
1383         slot->results = &results;
1384         curl_setup_http(slot->curl, lock->url, DAV_PUT,
1385                         &out_buffer, fwrite_null);
1386         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1387
1388         if (start_active_slot(slot)) {
1389                 run_active_slot(slot);
1390                 strbuf_release(&out_buffer.buf);
1391                 if (results.curl_result != CURLE_OK) {
1392                         fprintf(stderr,
1393                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1394                                 results.curl_result, results.http_code);
1395                         /* We should attempt recovery? */
1396                         return 0;
1397                 }
1398         } else {
1399                 strbuf_release(&out_buffer.buf);
1400                 fprintf(stderr, "Unable to start PUT request\n");
1401                 return 0;
1402         }
1403
1404         return 1;
1405 }
1406
1407 static struct ref *remote_refs;
1408
1409 static void one_remote_ref(const char *refname)
1410 {
1411         struct ref *ref;
1412         struct object *obj;
1413
1414         ref = alloc_ref(refname);
1415
1416         if (http_fetch_ref(repo->url, ref) != 0) {
1417                 fprintf(stderr,
1418                         "Unable to fetch ref %s from %s\n",
1419                         refname, repo->url);
1420                 free(ref);
1421                 return;
1422         }
1423
1424         /*
1425          * Fetch a copy of the object if it doesn't exist locally - it
1426          * may be required for updating server info later.
1427          */
1428         if (repo->can_update_info_refs && !has_object_file(&ref->old_oid)) {
1429                 obj = lookup_unknown_object(ref->old_oid.hash);
1430                 fprintf(stderr, "  fetch %s for %s\n",
1431                         oid_to_hex(&ref->old_oid), refname);
1432                 add_fetch_request(obj);
1433         }
1434
1435         ref->next = remote_refs;
1436         remote_refs = ref;
1437 }
1438
1439 static void get_dav_remote_heads(void)
1440 {
1441         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1442 }
1443
1444 static void add_remote_info_ref(struct remote_ls_ctx *ls)
1445 {
1446         struct strbuf *buf = (struct strbuf *)ls->userData;
1447         struct object *o;
1448         struct ref *ref;
1449
1450         ref = alloc_ref(ls->dentry_name);
1451
1452         if (http_fetch_ref(repo->url, ref) != 0) {
1453                 fprintf(stderr,
1454                         "Unable to fetch ref %s from %s\n",
1455                         ls->dentry_name, repo->url);
1456                 aborted = 1;
1457                 free(ref);
1458                 return;
1459         }
1460
1461         o = parse_object(&ref->old_oid);
1462         if (!o) {
1463                 fprintf(stderr,
1464                         "Unable to parse object %s for remote ref %s\n",
1465                         oid_to_hex(&ref->old_oid), ls->dentry_name);
1466                 aborted = 1;
1467                 free(ref);
1468                 return;
1469         }
1470
1471         strbuf_addf(buf, "%s\t%s\n",
1472                     oid_to_hex(&ref->old_oid), ls->dentry_name);
1473
1474         if (o->type == OBJ_TAG) {
1475                 o = deref_tag(o, ls->dentry_name, 0);
1476                 if (o)
1477                         strbuf_addf(buf, "%s\t%s^{}\n",
1478                                     oid_to_hex(&o->oid), ls->dentry_name);
1479         }
1480         free(ref);
1481 }
1482
1483 static void update_remote_info_refs(struct remote_lock *lock)
1484 {
1485         struct buffer buffer = { STRBUF_INIT, 0 };
1486         struct active_request_slot *slot;
1487         struct slot_results results;
1488         struct curl_slist *dav_headers;
1489
1490         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
1491                   add_remote_info_ref, &buffer.buf);
1492         if (!aborted) {
1493                 dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1494
1495                 slot = get_active_slot();
1496                 slot->results = &results;
1497                 curl_setup_http(slot->curl, lock->url, DAV_PUT,
1498                                 &buffer, fwrite_null);
1499                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1500
1501                 if (start_active_slot(slot)) {
1502                         run_active_slot(slot);
1503                         if (results.curl_result != CURLE_OK) {
1504                                 fprintf(stderr,
1505                                         "PUT error: curl result=%d, HTTP code=%ld\n",
1506                                         results.curl_result, results.http_code);
1507                         }
1508                 }
1509         }
1510         strbuf_release(&buffer.buf);
1511 }
1512
1513 static int remote_exists(const char *path)
1514 {
1515         char *url = xstrfmt("%s%s", repo->url, path);
1516         int ret;
1517
1518
1519         switch (http_get_strbuf(url, NULL, NULL)) {
1520         case HTTP_OK:
1521                 ret = 1;
1522                 break;
1523         case HTTP_MISSING_TARGET:
1524                 ret = 0;
1525                 break;
1526         case HTTP_ERROR:
1527                 error("unable to access '%s': %s", url, curl_errorstr);
1528                 /* fallthrough */
1529         default:
1530                 ret = -1;
1531         }
1532         free(url);
1533         return ret;
1534 }
1535
1536 static void fetch_symref(const char *path, char **symref, struct object_id *oid)
1537 {
1538         char *url = xstrfmt("%s%s", repo->url, path);
1539         struct strbuf buffer = STRBUF_INIT;
1540         const char *name;
1541
1542         if (http_get_strbuf(url, &buffer, NULL) != HTTP_OK)
1543                 die("Couldn't get %s for remote symref\n%s", url,
1544                     curl_errorstr);
1545         free(url);
1546
1547         FREE_AND_NULL(*symref);
1548         oidclr(oid);
1549
1550         if (buffer.len == 0)
1551                 return;
1552
1553         /* Cut off trailing newline. */
1554         strbuf_rtrim(&buffer);
1555
1556         /* If it's a symref, set the refname; otherwise try for a sha1 */
1557         if (skip_prefix(buffer.buf, "ref: ", &name)) {
1558                 *symref = xmemdupz(name, buffer.len - (name - buffer.buf));
1559         } else {
1560                 get_oid_hex(buffer.buf, oid);
1561         }
1562
1563         strbuf_release(&buffer);
1564 }
1565
1566 static int verify_merge_base(struct object_id *head_oid, struct ref *remote)
1567 {
1568         struct commit *head = lookup_commit_or_die(head_oid, "HEAD");
1569         struct commit *branch = lookup_commit_or_die(&remote->old_oid,
1570                                                      remote->name);
1571
1572         return in_merge_bases(branch, head);
1573 }
1574
1575 static int delete_remote_branch(const char *pattern, int force)
1576 {
1577         struct ref *refs = remote_refs;
1578         struct ref *remote_ref = NULL;
1579         struct object_id head_oid;
1580         char *symref = NULL;
1581         int match;
1582         int patlen = strlen(pattern);
1583         int i;
1584         struct active_request_slot *slot;
1585         struct slot_results results;
1586         char *url;
1587
1588         /* Find the remote branch(es) matching the specified branch name */
1589         for (match = 0; refs; refs = refs->next) {
1590                 char *name = refs->name;
1591                 int namelen = strlen(name);
1592                 if (namelen < patlen ||
1593                     memcmp(name + namelen - patlen, pattern, patlen))
1594                         continue;
1595                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
1596                         continue;
1597                 match++;
1598                 remote_ref = refs;
1599         }
1600         if (match == 0)
1601                 return error("No remote branch matches %s", pattern);
1602         if (match != 1)
1603                 return error("More than one remote branch matches %s",
1604                              pattern);
1605
1606         /*
1607          * Remote HEAD must be a symref (not exactly foolproof; a remote
1608          * symlink to a symref will look like a symref)
1609          */
1610         fetch_symref("HEAD", &symref, &head_oid);
1611         if (!symref)
1612                 return error("Remote HEAD is not a symref");
1613
1614         /* Remote branch must not be the remote HEAD */
1615         for (i = 0; symref && i < MAXDEPTH; i++) {
1616                 if (!strcmp(remote_ref->name, symref))
1617                         return error("Remote branch %s is the current HEAD",
1618                                      remote_ref->name);
1619                 fetch_symref(symref, &symref, &head_oid);
1620         }
1621
1622         /* Run extra sanity checks if delete is not forced */
1623         if (!force) {
1624                 /* Remote HEAD must resolve to a known object */
1625                 if (symref)
1626                         return error("Remote HEAD symrefs too deep");
1627                 if (is_null_oid(&head_oid))
1628                         return error("Unable to resolve remote HEAD");
1629                 if (!has_object_file(&head_oid))
1630                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", oid_to_hex(&head_oid));
1631
1632                 /* Remote branch must resolve to a known object */
1633                 if (is_null_oid(&remote_ref->old_oid))
1634                         return error("Unable to resolve remote branch %s",
1635                                      remote_ref->name);
1636                 if (!has_object_file(&remote_ref->old_oid))
1637                         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));
1638
1639                 /* Remote branch must be an ancestor of remote HEAD */
1640                 if (!verify_merge_base(&head_oid, remote_ref)) {
1641                         return error("The branch '%s' is not an ancestor "
1642                                      "of your current HEAD.\n"
1643                                      "If you are sure you want to delete it,"
1644                                      " run:\n\t'git http-push -D %s %s'",
1645                                      remote_ref->name, repo->url, pattern);
1646                 }
1647         }
1648
1649         /* Send delete request */
1650         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
1651         if (dry_run)
1652                 return 0;
1653         url = xstrfmt("%s%s", repo->url, remote_ref->name);
1654         slot = get_active_slot();
1655         slot->results = &results;
1656         curl_setup_http_get(slot->curl, url, DAV_DELETE);
1657         if (start_active_slot(slot)) {
1658                 run_active_slot(slot);
1659                 free(url);
1660                 if (results.curl_result != CURLE_OK)
1661                         return error("DELETE request failed (%d/%ld)",
1662                                      results.curl_result, results.http_code);
1663         } else {
1664                 free(url);
1665                 return error("Unable to start DELETE request");
1666         }
1667
1668         return 0;
1669 }
1670
1671 static void run_request_queue(void)
1672 {
1673 #ifdef USE_CURL_MULTI
1674         is_running_queue = 1;
1675         fill_active_slots();
1676         add_fill_function(NULL, fill_active_slot);
1677 #endif
1678         do {
1679                 finish_all_active_slots();
1680 #ifdef USE_CURL_MULTI
1681                 fill_active_slots();
1682 #endif
1683         } while (request_queue_head && !aborted);
1684
1685 #ifdef USE_CURL_MULTI
1686         is_running_queue = 0;
1687 #endif
1688 }
1689
1690 int cmd_main(int argc, const char **argv)
1691 {
1692         struct transfer_request *request;
1693         struct transfer_request *next_request;
1694         int nr_refspec = 0;
1695         const char **refspec = NULL;
1696         struct remote_lock *ref_lock = NULL;
1697         struct remote_lock *info_ref_lock = NULL;
1698         struct rev_info revs;
1699         int delete_branch = 0;
1700         int force_delete = 0;
1701         int objects_to_send;
1702         int rc = 0;
1703         int i;
1704         int new_refs;
1705         struct ref *ref, *local_refs;
1706
1707         repo = xcalloc(1, sizeof(*repo));
1708
1709         argv++;
1710         for (i = 1; i < argc; i++, argv++) {
1711                 const char *arg = *argv;
1712
1713                 if (*arg == '-') {
1714                         if (!strcmp(arg, "--all")) {
1715                                 push_all = MATCH_REFS_ALL;
1716                                 continue;
1717                         }
1718                         if (!strcmp(arg, "--force")) {
1719                                 force_all = 1;
1720                                 continue;
1721                         }
1722                         if (!strcmp(arg, "--dry-run")) {
1723                                 dry_run = 1;
1724                                 continue;
1725                         }
1726                         if (!strcmp(arg, "--helper-status")) {
1727                                 helper_status = 1;
1728                                 continue;
1729                         }
1730                         if (!strcmp(arg, "--verbose")) {
1731                                 push_verbosely = 1;
1732                                 http_is_verbose = 1;
1733                                 continue;
1734                         }
1735                         if (!strcmp(arg, "-d")) {
1736                                 delete_branch = 1;
1737                                 continue;
1738                         }
1739                         if (!strcmp(arg, "-D")) {
1740                                 delete_branch = 1;
1741                                 force_delete = 1;
1742                                 continue;
1743                         }
1744                         if (!strcmp(arg, "-h"))
1745                                 usage(http_push_usage);
1746                 }
1747                 if (!repo->url) {
1748                         char *path = strstr(arg, "//");
1749                         str_end_url_with_slash(arg, &repo->url);
1750                         repo->path_len = strlen(repo->url);
1751                         if (path) {
1752                                 repo->path = strchr(path+2, '/');
1753                                 if (repo->path)
1754                                         repo->path_len = strlen(repo->path);
1755                         }
1756                         continue;
1757                 }
1758                 refspec = argv;
1759                 nr_refspec = argc - i;
1760                 break;
1761         }
1762
1763 #ifndef USE_CURL_MULTI
1764         die("git-push is not available for http/https repository when not compiled with USE_CURL_MULTI");
1765 #endif
1766
1767         if (!repo->url)
1768                 usage(http_push_usage);
1769
1770         if (delete_branch && nr_refspec != 1)
1771                 die("You must specify only one branch name when deleting a remote branch");
1772
1773         setup_git_directory();
1774
1775         memset(remote_dir_exists, -1, 256);
1776
1777         http_init(NULL, repo->url, 1);
1778
1779 #ifdef USE_CURL_MULTI
1780         is_running_queue = 0;
1781 #endif
1782
1783         /* Verify DAV compliance/lock support */
1784         if (!locking_available()) {
1785                 rc = 1;
1786                 goto cleanup;
1787         }
1788
1789         sigchain_push_common(remove_locks_on_signal);
1790
1791         /* Check whether the remote has server info files */
1792         repo->can_update_info_refs = 0;
1793         repo->has_info_refs = remote_exists("info/refs");
1794         repo->has_info_packs = remote_exists("objects/info/packs");
1795         if (repo->has_info_refs) {
1796                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
1797                 if (info_ref_lock)
1798                         repo->can_update_info_refs = 1;
1799                 else {
1800                         error("cannot lock existing info/refs");
1801                         rc = 1;
1802                         goto cleanup;
1803                 }
1804         }
1805         if (repo->has_info_packs)
1806                 fetch_indices();
1807
1808         /* Get a list of all local and remote heads to validate refspecs */
1809         local_refs = get_local_heads();
1810         fprintf(stderr, "Fetching remote heads...\n");
1811         get_dav_remote_heads();
1812         run_request_queue();
1813
1814         /* Remove a remote branch if -d or -D was specified */
1815         if (delete_branch) {
1816                 if (delete_remote_branch(refspec[0], force_delete) == -1) {
1817                         fprintf(stderr, "Unable to delete remote branch %s\n",
1818                                 refspec[0]);
1819                         if (helper_status)
1820                                 printf("error %s cannot remove\n", refspec[0]);
1821                 }
1822                 goto cleanup;
1823         }
1824
1825         /* match them up */
1826         if (match_push_refs(local_refs, &remote_refs,
1827                             nr_refspec, (const char **) refspec, push_all)) {
1828                 rc = -1;
1829                 goto cleanup;
1830         }
1831         if (!remote_refs) {
1832                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
1833                 if (helper_status)
1834                         printf("error null no match\n");
1835                 rc = 0;
1836                 goto cleanup;
1837         }
1838
1839         new_refs = 0;
1840         for (ref = remote_refs; ref; ref = ref->next) {
1841                 struct argv_array commit_argv = ARGV_ARRAY_INIT;
1842
1843                 if (!ref->peer_ref)
1844                         continue;
1845
1846                 if (is_null_oid(&ref->peer_ref->new_oid)) {
1847                         if (delete_remote_branch(ref->name, 1) == -1) {
1848                                 error("Could not remove %s", ref->name);
1849                                 if (helper_status)
1850                                         printf("error %s cannot remove\n", ref->name);
1851                                 rc = -4;
1852                         }
1853                         else if (helper_status)
1854                                 printf("ok %s\n", ref->name);
1855                         new_refs++;
1856                         continue;
1857                 }
1858
1859                 if (!oidcmp(&ref->old_oid, &ref->peer_ref->new_oid)) {
1860                         if (push_verbosely)
1861                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
1862                         if (helper_status)
1863                                 printf("ok %s up to date\n", ref->name);
1864                         continue;
1865                 }
1866
1867                 if (!force_all &&
1868                     !is_null_oid(&ref->old_oid) &&
1869                     !ref->force) {
1870                         if (!has_object_file(&ref->old_oid) ||
1871                             !ref_newer(&ref->peer_ref->new_oid,
1872                                        &ref->old_oid)) {
1873                                 /*
1874                                  * We do not have the remote ref, or
1875                                  * we know that the remote ref is not
1876                                  * an ancestor of what we are trying to
1877                                  * push.  Either way this can be losing
1878                                  * commits at the remote end and likely
1879                                  * we were not up to date to begin with.
1880                                  */
1881                                 error("remote '%s' is not an ancestor of\n"
1882                                       "local '%s'.\n"
1883                                       "Maybe you are not up-to-date and "
1884                                       "need to pull first?",
1885                                       ref->name,
1886                                       ref->peer_ref->name);
1887                                 if (helper_status)
1888                                         printf("error %s non-fast forward\n", ref->name);
1889                                 rc = -2;
1890                                 continue;
1891                         }
1892                 }
1893                 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1894                 new_refs++;
1895
1896                 fprintf(stderr, "updating '%s'", ref->name);
1897                 if (strcmp(ref->name, ref->peer_ref->name))
1898                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
1899                 fprintf(stderr, "\n  from %s\n  to   %s\n",
1900                         oid_to_hex(&ref->old_oid), oid_to_hex(&ref->new_oid));
1901                 if (dry_run) {
1902                         if (helper_status)
1903                                 printf("ok %s\n", ref->name);
1904                         continue;
1905                 }
1906
1907                 /* Lock remote branch ref */
1908                 ref_lock = lock_remote(ref->name, LOCK_TIME);
1909                 if (ref_lock == NULL) {
1910                         fprintf(stderr, "Unable to lock remote branch %s\n",
1911                                 ref->name);
1912                         if (helper_status)
1913                                 printf("error %s lock error\n", ref->name);
1914                         rc = 1;
1915                         continue;
1916                 }
1917
1918                 /* Set up revision info for this refspec */
1919                 argv_array_push(&commit_argv, ""); /* ignored */
1920                 argv_array_push(&commit_argv, "--objects");
1921                 argv_array_push(&commit_argv, oid_to_hex(&ref->new_oid));
1922                 if (!push_all && !is_null_oid(&ref->old_oid))
1923                         argv_array_pushf(&commit_argv, "^%s",
1924                                          oid_to_hex(&ref->old_oid));
1925                 init_revisions(&revs, setup_git_directory());
1926                 setup_revisions(commit_argv.argc, commit_argv.argv, &revs, NULL);
1927                 revs.edge_hint = 0; /* just in case */
1928
1929                 /* Generate a list of objects that need to be pushed */
1930                 pushing = 0;
1931                 if (prepare_revision_walk(&revs))
1932                         die("revision walk setup failed");
1933                 mark_edges_uninteresting(&revs, NULL);
1934                 objects_to_send = get_delta(&revs, ref_lock);
1935                 finish_all_active_slots();
1936
1937                 /* Push missing objects to remote, this would be a
1938                    convenient time to pack them first if appropriate. */
1939                 pushing = 1;
1940                 if (objects_to_send)
1941                         fprintf(stderr, "    sending %d objects\n",
1942                                 objects_to_send);
1943
1944                 run_request_queue();
1945
1946                 /* Update the remote branch if all went well */
1947                 if (aborted || !update_remote(ref->new_oid.hash, ref_lock))
1948                         rc = 1;
1949
1950                 if (!rc)
1951                         fprintf(stderr, "    done\n");
1952                 if (helper_status)
1953                         printf("%s %s\n", !rc ? "ok" : "error", ref->name);
1954                 unlock_remote(ref_lock);
1955                 check_locks();
1956                 argv_array_clear(&commit_argv);
1957         }
1958
1959         /* Update remote server info if appropriate */
1960         if (repo->has_info_refs && new_refs) {
1961                 if (info_ref_lock && repo->can_update_info_refs) {
1962                         fprintf(stderr, "Updating remote server info\n");
1963                         if (!dry_run)
1964                                 update_remote_info_refs(info_ref_lock);
1965                 } else {
1966                         fprintf(stderr, "Unable to update server info\n");
1967                 }
1968         }
1969
1970  cleanup:
1971         if (info_ref_lock)
1972                 unlock_remote(info_ref_lock);
1973         free(repo);
1974
1975         http_cleanup();
1976
1977         request = request_queue_head;
1978         while (request != NULL) {
1979                 next_request = request->next;
1980                 release_request(request);
1981                 request = next_request;
1982         }
1983
1984         return rc;
1985 }