Merge branch 'rj/sparse'
[git] / transport.c
1 #include "cache.h"
2 #include "transport.h"
3 #include "run-command.h"
4 #include "pkt-line.h"
5 #include "fetch-pack.h"
6 #include "send-pack.h"
7 #include "walker.h"
8 #include "bundle.h"
9 #include "dir.h"
10 #include "refs.h"
11 #include "branch.h"
12 #include "url.h"
13 #include "submodule.h"
14 #include "string-list.h"
15
16 /* rsync support */
17
18 /*
19  * We copy packed-refs and refs/ into a temporary file, then read the
20  * loose refs recursively (sorting whenever possible), and then inserting
21  * those packed refs that are not yet in the list (not validating, but
22  * assuming that the file is sorted).
23  *
24  * Appears refactoring this from refs.c is too cumbersome.
25  */
26
27 static int str_cmp(const void *a, const void *b)
28 {
29         const char *s1 = a;
30         const char *s2 = b;
31
32         return strcmp(s1, s2);
33 }
34
35 /* path->buf + name_offset is expected to point to "refs/" */
36
37 static int read_loose_refs(struct strbuf *path, int name_offset,
38                 struct ref **tail)
39 {
40         DIR *dir = opendir(path->buf);
41         struct dirent *de;
42         struct {
43                 char **entries;
44                 int nr, alloc;
45         } list;
46         int i, pathlen;
47
48         if (!dir)
49                 return -1;
50
51         memset (&list, 0, sizeof(list));
52
53         while ((de = readdir(dir))) {
54                 if (is_dot_or_dotdot(de->d_name))
55                         continue;
56                 ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
57                 list.entries[list.nr++] = xstrdup(de->d_name);
58         }
59         closedir(dir);
60
61         /* sort the list */
62
63         qsort(list.entries, list.nr, sizeof(char *), str_cmp);
64
65         pathlen = path->len;
66         strbuf_addch(path, '/');
67
68         for (i = 0; i < list.nr; i++, strbuf_setlen(path, pathlen + 1)) {
69                 strbuf_addstr(path, list.entries[i]);
70                 if (read_loose_refs(path, name_offset, tail)) {
71                         int fd = open(path->buf, O_RDONLY);
72                         char buffer[40];
73                         struct ref *next;
74
75                         if (fd < 0)
76                                 continue;
77                         next = alloc_ref(path->buf + name_offset);
78                         if (read_in_full(fd, buffer, 40) != 40 ||
79                                         get_sha1_hex(buffer, next->old_sha1)) {
80                                 close(fd);
81                                 free(next);
82                                 continue;
83                         }
84                         close(fd);
85                         (*tail)->next = next;
86                         *tail = next;
87                 }
88         }
89         strbuf_setlen(path, pathlen);
90
91         for (i = 0; i < list.nr; i++)
92                 free(list.entries[i]);
93         free(list.entries);
94
95         return 0;
96 }
97
98 /* insert the packed refs for which no loose refs were found */
99
100 static void insert_packed_refs(const char *packed_refs, struct ref **list)
101 {
102         FILE *f = fopen(packed_refs, "r");
103         static char buffer[PATH_MAX];
104
105         if (!f)
106                 return;
107
108         for (;;) {
109                 int cmp = 0; /* assigned before used */
110                 int len;
111
112                 if (!fgets(buffer, sizeof(buffer), f)) {
113                         fclose(f);
114                         return;
115                 }
116
117                 if (hexval(buffer[0]) > 0xf)
118                         continue;
119                 len = strlen(buffer);
120                 if (len && buffer[len - 1] == '\n')
121                         buffer[--len] = '\0';
122                 if (len < 41)
123                         continue;
124                 while ((*list)->next &&
125                                 (cmp = strcmp(buffer + 41,
126                                       (*list)->next->name)) > 0)
127                         list = &(*list)->next;
128                 if (!(*list)->next || cmp < 0) {
129                         struct ref *next = alloc_ref(buffer + 41);
130                         buffer[40] = '\0';
131                         if (get_sha1_hex(buffer, next->old_sha1)) {
132                                 warning ("invalid SHA-1: %s", buffer);
133                                 free(next);
134                                 continue;
135                         }
136                         next->next = (*list)->next;
137                         (*list)->next = next;
138                         list = &(*list)->next;
139                 }
140         }
141 }
142
143 static void set_upstreams(struct transport *transport, struct ref *refs,
144         int pretend)
145 {
146         struct ref *ref;
147         for (ref = refs; ref; ref = ref->next) {
148                 const char *localname;
149                 const char *tmp;
150                 const char *remotename;
151                 unsigned char sha[20];
152                 int flag = 0;
153                 /*
154                  * Check suitability for tracking. Must be successful /
155                  * already up-to-date ref create/modify (not delete).
156                  */
157                 if (ref->status != REF_STATUS_OK &&
158                         ref->status != REF_STATUS_UPTODATE)
159                         continue;
160                 if (!ref->peer_ref)
161                         continue;
162                 if (is_null_sha1(ref->new_sha1))
163                         continue;
164
165                 /* Follow symbolic refs (mainly for HEAD). */
166                 localname = ref->peer_ref->name;
167                 remotename = ref->name;
168                 tmp = resolve_ref_unsafe(localname, sha, 1, &flag);
169                 if (tmp && flag & REF_ISSYMREF &&
170                         !prefixcmp(tmp, "refs/heads/"))
171                         localname = tmp;
172
173                 /* Both source and destination must be local branches. */
174                 if (!localname || prefixcmp(localname, "refs/heads/"))
175                         continue;
176                 if (!remotename || prefixcmp(remotename, "refs/heads/"))
177                         continue;
178
179                 if (!pretend)
180                         install_branch_config(BRANCH_CONFIG_VERBOSE,
181                                 localname + 11, transport->remote->name,
182                                 remotename);
183                 else
184                         printf("Would set upstream of '%s' to '%s' of '%s'\n",
185                                 localname + 11, remotename + 11,
186                                 transport->remote->name);
187         }
188 }
189
190 static const char *rsync_url(const char *url)
191 {
192         return prefixcmp(url, "rsync://") ? skip_prefix(url, "rsync:") : url;
193 }
194
195 static struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
196 {
197         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
198         struct ref dummy = {NULL}, *tail = &dummy;
199         struct child_process rsync;
200         const char *args[5];
201         int temp_dir_len;
202
203         if (for_push)
204                 return NULL;
205
206         /* copy the refs to the temporary directory */
207
208         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
209         if (!mkdtemp(temp_dir.buf))
210                 die_errno ("Could not make temporary directory");
211         temp_dir_len = temp_dir.len;
212
213         strbuf_addstr(&buf, rsync_url(transport->url));
214         strbuf_addstr(&buf, "/refs");
215
216         memset(&rsync, 0, sizeof(rsync));
217         rsync.argv = args;
218         rsync.stdout_to_stderr = 1;
219         args[0] = "rsync";
220         args[1] = (transport->verbose > 1) ? "-rv" : "-r";
221         args[2] = buf.buf;
222         args[3] = temp_dir.buf;
223         args[4] = NULL;
224
225         if (run_command(&rsync))
226                 die ("Could not run rsync to get refs");
227
228         strbuf_reset(&buf);
229         strbuf_addstr(&buf, rsync_url(transport->url));
230         strbuf_addstr(&buf, "/packed-refs");
231
232         args[2] = buf.buf;
233
234         if (run_command(&rsync))
235                 die ("Could not run rsync to get refs");
236
237         /* read the copied refs */
238
239         strbuf_addstr(&temp_dir, "/refs");
240         read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
241         strbuf_setlen(&temp_dir, temp_dir_len);
242
243         tail = &dummy;
244         strbuf_addstr(&temp_dir, "/packed-refs");
245         insert_packed_refs(temp_dir.buf, &tail);
246         strbuf_setlen(&temp_dir, temp_dir_len);
247
248         if (remove_dir_recursively(&temp_dir, 0))
249                 warning ("Error removing temporary directory %s.",
250                                 temp_dir.buf);
251
252         strbuf_release(&buf);
253         strbuf_release(&temp_dir);
254
255         return dummy.next;
256 }
257
258 static int fetch_objs_via_rsync(struct transport *transport,
259                                 int nr_objs, struct ref **to_fetch)
260 {
261         struct strbuf buf = STRBUF_INIT;
262         struct child_process rsync;
263         const char *args[8];
264         int result;
265
266         strbuf_addstr(&buf, rsync_url(transport->url));
267         strbuf_addstr(&buf, "/objects/");
268
269         memset(&rsync, 0, sizeof(rsync));
270         rsync.argv = args;
271         rsync.stdout_to_stderr = 1;
272         args[0] = "rsync";
273         args[1] = (transport->verbose > 1) ? "-rv" : "-r";
274         args[2] = "--ignore-existing";
275         args[3] = "--exclude";
276         args[4] = "info";
277         args[5] = buf.buf;
278         args[6] = get_object_directory();
279         args[7] = NULL;
280
281         /* NEEDSWORK: handle one level of alternates */
282         result = run_command(&rsync);
283
284         strbuf_release(&buf);
285
286         return result;
287 }
288
289 static int write_one_ref(const char *name, const unsigned char *sha1,
290                 int flags, void *data)
291 {
292         struct strbuf *buf = data;
293         int len = buf->len;
294         FILE *f;
295
296         /* when called via for_each_ref(), flags is non-zero */
297         if (flags && prefixcmp(name, "refs/heads/") &&
298                         prefixcmp(name, "refs/tags/"))
299                 return 0;
300
301         strbuf_addstr(buf, name);
302         if (safe_create_leading_directories(buf->buf) ||
303                         !(f = fopen(buf->buf, "w")) ||
304                         fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
305                         fclose(f))
306                 return error("problems writing temporary file %s", buf->buf);
307         strbuf_setlen(buf, len);
308         return 0;
309 }
310
311 static int write_refs_to_temp_dir(struct strbuf *temp_dir,
312                 int refspec_nr, const char **refspec)
313 {
314         int i;
315
316         for (i = 0; i < refspec_nr; i++) {
317                 unsigned char sha1[20];
318                 char *ref;
319
320                 if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
321                         return error("Could not get ref %s", refspec[i]);
322
323                 if (write_one_ref(ref, sha1, 0, temp_dir)) {
324                         free(ref);
325                         return -1;
326                 }
327                 free(ref);
328         }
329         return 0;
330 }
331
332 static int rsync_transport_push(struct transport *transport,
333                 int refspec_nr, const char **refspec, int flags)
334 {
335         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
336         int result = 0, i;
337         struct child_process rsync;
338         const char *args[10];
339
340         if (flags & TRANSPORT_PUSH_MIRROR)
341                 return error("rsync transport does not support mirror mode");
342
343         /* first push the objects */
344
345         strbuf_addstr(&buf, rsync_url(transport->url));
346         strbuf_addch(&buf, '/');
347
348         memset(&rsync, 0, sizeof(rsync));
349         rsync.argv = args;
350         rsync.stdout_to_stderr = 1;
351         i = 0;
352         args[i++] = "rsync";
353         args[i++] = "-a";
354         if (flags & TRANSPORT_PUSH_DRY_RUN)
355                 args[i++] = "--dry-run";
356         if (transport->verbose > 1)
357                 args[i++] = "-v";
358         args[i++] = "--ignore-existing";
359         args[i++] = "--exclude";
360         args[i++] = "info";
361         args[i++] = get_object_directory();
362         args[i++] = buf.buf;
363         args[i++] = NULL;
364
365         if (run_command(&rsync))
366                 return error("Could not push objects to %s",
367                                 rsync_url(transport->url));
368
369         /* copy the refs to the temporary directory; they could be packed. */
370
371         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
372         if (!mkdtemp(temp_dir.buf))
373                 die_errno ("Could not make temporary directory");
374         strbuf_addch(&temp_dir, '/');
375
376         if (flags & TRANSPORT_PUSH_ALL) {
377                 if (for_each_ref(write_one_ref, &temp_dir))
378                         return -1;
379         } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
380                 return -1;
381
382         i = 2;
383         if (flags & TRANSPORT_PUSH_DRY_RUN)
384                 args[i++] = "--dry-run";
385         if (!(flags & TRANSPORT_PUSH_FORCE))
386                 args[i++] = "--ignore-existing";
387         args[i++] = temp_dir.buf;
388         args[i++] = rsync_url(transport->url);
389         args[i++] = NULL;
390         if (run_command(&rsync))
391                 result = error("Could not push to %s",
392                                 rsync_url(transport->url));
393
394         if (remove_dir_recursively(&temp_dir, 0))
395                 warning ("Could not remove temporary directory %s.",
396                                 temp_dir.buf);
397
398         strbuf_release(&buf);
399         strbuf_release(&temp_dir);
400
401         return result;
402 }
403
404 struct bundle_transport_data {
405         int fd;
406         struct bundle_header header;
407 };
408
409 static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
410 {
411         struct bundle_transport_data *data = transport->data;
412         struct ref *result = NULL;
413         int i;
414
415         if (for_push)
416                 return NULL;
417
418         if (data->fd > 0)
419                 close(data->fd);
420         data->fd = read_bundle_header(transport->url, &data->header);
421         if (data->fd < 0)
422                 die ("Could not read bundle '%s'.", transport->url);
423         for (i = 0; i < data->header.references.nr; i++) {
424                 struct ref_list_entry *e = data->header.references.list + i;
425                 struct ref *ref = alloc_ref(e->name);
426                 hashcpy(ref->old_sha1, e->sha1);
427                 ref->next = result;
428                 result = ref;
429         }
430         return result;
431 }
432
433 static int fetch_refs_from_bundle(struct transport *transport,
434                                int nr_heads, struct ref **to_fetch)
435 {
436         struct bundle_transport_data *data = transport->data;
437         return unbundle(&data->header, data->fd,
438                         transport->progress ? BUNDLE_VERBOSE : 0);
439 }
440
441 static int close_bundle(struct transport *transport)
442 {
443         struct bundle_transport_data *data = transport->data;
444         if (data->fd > 0)
445                 close(data->fd);
446         free(data);
447         return 0;
448 }
449
450 struct git_transport_data {
451         struct git_transport_options options;
452         struct child_process *conn;
453         int fd[2];
454         unsigned got_remote_heads : 1;
455         struct extra_have_objects extra_have;
456 };
457
458 static int set_git_option(struct git_transport_options *opts,
459                           const char *name, const char *value)
460 {
461         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
462                 opts->uploadpack = value;
463                 return 0;
464         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
465                 opts->receivepack = value;
466                 return 0;
467         } else if (!strcmp(name, TRANS_OPT_THIN)) {
468                 opts->thin = !!value;
469                 return 0;
470         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
471                 opts->followtags = !!value;
472                 return 0;
473         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
474                 opts->keep = !!value;
475                 return 0;
476         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
477                 if (!value)
478                         opts->depth = 0;
479                 else {
480                         char *end;
481                         opts->depth = strtol(value, &end, 0);
482                         if (*end)
483                                 die("transport: invalid depth option '%s'", value);
484                 }
485                 return 0;
486         }
487         return 1;
488 }
489
490 static int connect_setup(struct transport *transport, int for_push, int verbose)
491 {
492         struct git_transport_data *data = transport->data;
493
494         if (data->conn)
495                 return 0;
496
497         data->conn = git_connect(data->fd, transport->url,
498                                  for_push ? data->options.receivepack :
499                                  data->options.uploadpack,
500                                  verbose ? CONNECT_VERBOSE : 0);
501
502         return 0;
503 }
504
505 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
506 {
507         struct git_transport_data *data = transport->data;
508         struct ref *refs;
509
510         connect_setup(transport, for_push, 0);
511         get_remote_heads(data->fd[0], NULL, 0, &refs,
512                          for_push ? REF_NORMAL : 0, &data->extra_have);
513         data->got_remote_heads = 1;
514
515         return refs;
516 }
517
518 static int fetch_refs_via_pack(struct transport *transport,
519                                int nr_heads, struct ref **to_fetch)
520 {
521         struct git_transport_data *data = transport->data;
522         const struct ref *refs;
523         char *dest = xstrdup(transport->url);
524         struct fetch_pack_args args;
525         struct ref *refs_tmp = NULL;
526
527         memset(&args, 0, sizeof(args));
528         args.uploadpack = data->options.uploadpack;
529         args.keep_pack = data->options.keep;
530         args.lock_pack = 1;
531         args.use_thin_pack = data->options.thin;
532         args.include_tag = data->options.followtags;
533         args.verbose = (transport->verbose > 1);
534         args.quiet = (transport->verbose < 0);
535         args.no_progress = !transport->progress;
536         args.depth = data->options.depth;
537         args.check_self_contained_and_connected =
538                 data->options.check_self_contained_and_connected;
539
540         if (!data->got_remote_heads) {
541                 connect_setup(transport, 0, 0);
542                 get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0, NULL);
543                 data->got_remote_heads = 1;
544         }
545
546         refs = fetch_pack(&args, data->fd, data->conn,
547                           refs_tmp ? refs_tmp : transport->remote_refs,
548                           dest, to_fetch, nr_heads,
549                           &transport->pack_lockfile);
550         close(data->fd[0]);
551         close(data->fd[1]);
552         if (finish_connect(data->conn))
553                 refs = NULL;
554         data->conn = NULL;
555         data->got_remote_heads = 0;
556         data->options.self_contained_and_connected =
557                 args.self_contained_and_connected;
558
559         free_refs(refs_tmp);
560
561         free(dest);
562         return (refs ? 0 : -1);
563 }
564
565 static int push_had_errors(struct ref *ref)
566 {
567         for (; ref; ref = ref->next) {
568                 switch (ref->status) {
569                 case REF_STATUS_NONE:
570                 case REF_STATUS_UPTODATE:
571                 case REF_STATUS_OK:
572                         break;
573                 default:
574                         return 1;
575                 }
576         }
577         return 0;
578 }
579
580 int transport_refs_pushed(struct ref *ref)
581 {
582         for (; ref; ref = ref->next) {
583                 switch(ref->status) {
584                 case REF_STATUS_NONE:
585                 case REF_STATUS_UPTODATE:
586                         break;
587                 default:
588                         return 1;
589                 }
590         }
591         return 0;
592 }
593
594 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
595 {
596         struct refspec rs;
597
598         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
599                 return;
600
601         rs.src = ref->name;
602         rs.dst = NULL;
603
604         if (!remote_find_tracking(remote, &rs)) {
605                 if (verbose)
606                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
607                 if (ref->deletion) {
608                         delete_ref(rs.dst, NULL, 0);
609                 } else
610                         update_ref("update by push", rs.dst,
611                                         ref->new_sha1, NULL, 0, 0);
612                 free(rs.dst);
613         }
614 }
615
616 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
617 {
618         if (porcelain) {
619                 if (from)
620                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
621                 else
622                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
623                 if (msg)
624                         fprintf(stdout, "%s (%s)\n", summary, msg);
625                 else
626                         fprintf(stdout, "%s\n", summary);
627         } else {
628                 fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
629                 if (from)
630                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
631                 else
632                         fputs(prettify_refname(to->name), stderr);
633                 if (msg) {
634                         fputs(" (", stderr);
635                         fputs(msg, stderr);
636                         fputc(')', stderr);
637                 }
638                 fputc('\n', stderr);
639         }
640 }
641
642 static const char *status_abbrev(unsigned char sha1[20])
643 {
644         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
645 }
646
647 static void print_ok_ref_status(struct ref *ref, int porcelain)
648 {
649         if (ref->deletion)
650                 print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
651         else if (is_null_sha1(ref->old_sha1))
652                 print_ref_status('*',
653                         (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
654                         "[new branch]"),
655                         ref, ref->peer_ref, NULL, porcelain);
656         else {
657                 char quickref[84];
658                 char type;
659                 const char *msg;
660
661                 strcpy(quickref, status_abbrev(ref->old_sha1));
662                 if (ref->forced_update) {
663                         strcat(quickref, "...");
664                         type = '+';
665                         msg = "forced update";
666                 } else {
667                         strcat(quickref, "..");
668                         type = ' ';
669                         msg = NULL;
670                 }
671                 strcat(quickref, status_abbrev(ref->new_sha1));
672
673                 print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
674         }
675 }
676
677 static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
678 {
679         if (!count)
680                 fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
681
682         switch(ref->status) {
683         case REF_STATUS_NONE:
684                 print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
685                 break;
686         case REF_STATUS_REJECT_NODELETE:
687                 print_ref_status('!', "[rejected]", ref, NULL,
688                                                  "remote does not support deleting refs", porcelain);
689                 break;
690         case REF_STATUS_UPTODATE:
691                 print_ref_status('=', "[up to date]", ref,
692                                                  ref->peer_ref, NULL, porcelain);
693                 break;
694         case REF_STATUS_REJECT_NONFASTFORWARD:
695                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
696                                                  "non-fast-forward", porcelain);
697                 break;
698         case REF_STATUS_REJECT_ALREADY_EXISTS:
699                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
700                                                  "already exists", porcelain);
701                 break;
702         case REF_STATUS_REJECT_FETCH_FIRST:
703                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
704                                                  "fetch first", porcelain);
705                 break;
706         case REF_STATUS_REJECT_NEEDS_FORCE:
707                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
708                                                  "needs force", porcelain);
709                 break;
710         case REF_STATUS_REMOTE_REJECT:
711                 print_ref_status('!', "[remote rejected]", ref,
712                                                  ref->deletion ? NULL : ref->peer_ref,
713                                                  ref->remote_status, porcelain);
714                 break;
715         case REF_STATUS_EXPECTING_REPORT:
716                 print_ref_status('!', "[remote failure]", ref,
717                                                  ref->deletion ? NULL : ref->peer_ref,
718                                                  "remote failed to report status", porcelain);
719                 break;
720         case REF_STATUS_OK:
721                 print_ok_ref_status(ref, porcelain);
722                 break;
723         }
724
725         return 1;
726 }
727
728 void transport_print_push_status(const char *dest, struct ref *refs,
729                                   int verbose, int porcelain, unsigned int *reject_reasons)
730 {
731         struct ref *ref;
732         int n = 0;
733         unsigned char head_sha1[20];
734         char *head;
735
736         head = resolve_refdup("HEAD", head_sha1, 1, NULL);
737
738         if (verbose) {
739                 for (ref = refs; ref; ref = ref->next)
740                         if (ref->status == REF_STATUS_UPTODATE)
741                                 n += print_one_push_status(ref, dest, n, porcelain);
742         }
743
744         for (ref = refs; ref; ref = ref->next)
745                 if (ref->status == REF_STATUS_OK)
746                         n += print_one_push_status(ref, dest, n, porcelain);
747
748         *reject_reasons = 0;
749         for (ref = refs; ref; ref = ref->next) {
750                 if (ref->status != REF_STATUS_NONE &&
751                     ref->status != REF_STATUS_UPTODATE &&
752                     ref->status != REF_STATUS_OK)
753                         n += print_one_push_status(ref, dest, n, porcelain);
754                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
755                         if (head != NULL && !strcmp(head, ref->name))
756                                 *reject_reasons |= REJECT_NON_FF_HEAD;
757                         else
758                                 *reject_reasons |= REJECT_NON_FF_OTHER;
759                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
760                         *reject_reasons |= REJECT_ALREADY_EXISTS;
761                 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
762                         *reject_reasons |= REJECT_FETCH_FIRST;
763                 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
764                         *reject_reasons |= REJECT_NEEDS_FORCE;
765                 }
766         }
767 }
768
769 void transport_verify_remote_names(int nr_heads, const char **heads)
770 {
771         int i;
772
773         for (i = 0; i < nr_heads; i++) {
774                 const char *local = heads[i];
775                 const char *remote = strrchr(heads[i], ':');
776
777                 if (*local == '+')
778                         local++;
779
780                 /* A matching refspec is okay.  */
781                 if (remote == local && remote[1] == '\0')
782                         continue;
783
784                 remote = remote ? (remote + 1) : local;
785                 if (check_refname_format(remote,
786                                 REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
787                         die("remote part of refspec is not a valid name in %s",
788                                 heads[i]);
789         }
790 }
791
792 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
793 {
794         struct git_transport_data *data = transport->data;
795         struct send_pack_args args;
796         int ret;
797
798         if (!data->got_remote_heads) {
799                 struct ref *tmp_refs;
800                 connect_setup(transport, 1, 0);
801
802                 get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL, NULL);
803                 data->got_remote_heads = 1;
804         }
805
806         memset(&args, 0, sizeof(args));
807         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
808         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
809         args.use_thin_pack = data->options.thin;
810         args.verbose = (transport->verbose > 0);
811         args.quiet = (transport->verbose < 0);
812         args.progress = transport->progress;
813         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
814         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
815
816         ret = send_pack(&args, data->fd, data->conn, remote_refs,
817                         &data->extra_have);
818
819         close(data->fd[1]);
820         close(data->fd[0]);
821         ret |= finish_connect(data->conn);
822         data->conn = NULL;
823         data->got_remote_heads = 0;
824
825         return ret;
826 }
827
828 static int connect_git(struct transport *transport, const char *name,
829                        const char *executable, int fd[2])
830 {
831         struct git_transport_data *data = transport->data;
832         data->conn = git_connect(data->fd, transport->url,
833                                  executable, 0);
834         fd[0] = data->fd[0];
835         fd[1] = data->fd[1];
836         return 0;
837 }
838
839 static int disconnect_git(struct transport *transport)
840 {
841         struct git_transport_data *data = transport->data;
842         if (data->conn) {
843                 if (data->got_remote_heads)
844                         packet_flush(data->fd[1]);
845                 close(data->fd[0]);
846                 close(data->fd[1]);
847                 finish_connect(data->conn);
848         }
849
850         free(data);
851         return 0;
852 }
853
854 void transport_take_over(struct transport *transport,
855                          struct child_process *child)
856 {
857         struct git_transport_data *data;
858
859         if (!transport->smart_options)
860                 die("Bug detected: Taking over transport requires non-NULL "
861                     "smart_options field.");
862
863         data = xcalloc(1, sizeof(*data));
864         data->options = *transport->smart_options;
865         data->conn = child;
866         data->fd[0] = data->conn->out;
867         data->fd[1] = data->conn->in;
868         data->got_remote_heads = 0;
869         transport->data = data;
870
871         transport->set_option = NULL;
872         transport->get_refs_list = get_refs_via_connect;
873         transport->fetch = fetch_refs_via_pack;
874         transport->push = NULL;
875         transport->push_refs = git_transport_push;
876         transport->disconnect = disconnect_git;
877         transport->smart_options = &(data->options);
878 }
879
880 static int is_local(const char *url)
881 {
882         const char *colon = strchr(url, ':');
883         const char *slash = strchr(url, '/');
884         return !colon || (slash && slash < colon) ||
885                 has_dos_drive_prefix(url);
886 }
887
888 static int is_file(const char *url)
889 {
890         struct stat buf;
891         if (stat(url, &buf))
892                 return 0;
893         return S_ISREG(buf.st_mode);
894 }
895
896 static int external_specification_len(const char *url)
897 {
898         return strchr(url, ':') - url;
899 }
900
901 struct transport *transport_get(struct remote *remote, const char *url)
902 {
903         const char *helper;
904         struct transport *ret = xcalloc(1, sizeof(*ret));
905
906         ret->progress = isatty(2);
907
908         if (!remote)
909                 die("No remote provided to transport_get()");
910
911         ret->got_remote_refs = 0;
912         ret->remote = remote;
913         helper = remote->foreign_vcs;
914
915         if (!url && remote->url)
916                 url = remote->url[0];
917         ret->url = url;
918
919         /* maybe it is a foreign URL? */
920         if (url) {
921                 const char *p = url;
922
923                 while (is_urlschemechar(p == url, *p))
924                         p++;
925                 if (!prefixcmp(p, "::"))
926                         helper = xstrndup(url, p - url);
927         }
928
929         if (helper) {
930                 transport_helper_init(ret, helper);
931         } else if (!prefixcmp(url, "rsync:")) {
932                 ret->get_refs_list = get_refs_via_rsync;
933                 ret->fetch = fetch_objs_via_rsync;
934                 ret->push = rsync_transport_push;
935                 ret->smart_options = NULL;
936         } else if (is_local(url) && is_file(url) && is_bundle(url, 1)) {
937                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
938                 ret->data = data;
939                 ret->get_refs_list = get_refs_from_bundle;
940                 ret->fetch = fetch_refs_from_bundle;
941                 ret->disconnect = close_bundle;
942                 ret->smart_options = NULL;
943         } else if (!is_url(url)
944                 || !prefixcmp(url, "file://")
945                 || !prefixcmp(url, "git://")
946                 || !prefixcmp(url, "ssh://")
947                 || !prefixcmp(url, "git+ssh://")
948                 || !prefixcmp(url, "ssh+git://")) {
949                 /* These are builtin smart transports. */
950                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
951                 ret->data = data;
952                 ret->set_option = NULL;
953                 ret->get_refs_list = get_refs_via_connect;
954                 ret->fetch = fetch_refs_via_pack;
955                 ret->push_refs = git_transport_push;
956                 ret->connect = connect_git;
957                 ret->disconnect = disconnect_git;
958                 ret->smart_options = &(data->options);
959
960                 data->conn = NULL;
961                 data->got_remote_heads = 0;
962         } else {
963                 /* Unknown protocol in URL. Pass to external handler. */
964                 int len = external_specification_len(url);
965                 char *handler = xmalloc(len + 1);
966                 handler[len] = 0;
967                 strncpy(handler, url, len);
968                 transport_helper_init(ret, handler);
969         }
970
971         if (ret->smart_options) {
972                 ret->smart_options->thin = 1;
973                 ret->smart_options->uploadpack = "git-upload-pack";
974                 if (remote->uploadpack)
975                         ret->smart_options->uploadpack = remote->uploadpack;
976                 ret->smart_options->receivepack = "git-receive-pack";
977                 if (remote->receivepack)
978                         ret->smart_options->receivepack = remote->receivepack;
979         }
980
981         return ret;
982 }
983
984 int transport_set_option(struct transport *transport,
985                          const char *name, const char *value)
986 {
987         int git_reports = 1, protocol_reports = 1;
988
989         if (transport->smart_options)
990                 git_reports = set_git_option(transport->smart_options,
991                                              name, value);
992
993         if (transport->set_option)
994                 protocol_reports = transport->set_option(transport, name,
995                                                         value);
996
997         /* If either report is 0, report 0 (success). */
998         if (!git_reports || !protocol_reports)
999                 return 0;
1000         /* If either reports -1 (invalid value), report -1. */
1001         if ((git_reports == -1) || (protocol_reports == -1))
1002                 return -1;
1003         /* Otherwise if both report unknown, report unknown. */
1004         return 1;
1005 }
1006
1007 void transport_set_verbosity(struct transport *transport, int verbosity,
1008         int force_progress)
1009 {
1010         if (verbosity >= 1)
1011                 transport->verbose = verbosity <= 3 ? verbosity : 3;
1012         if (verbosity < 0)
1013                 transport->verbose = -1;
1014
1015         /**
1016          * Rules used to determine whether to report progress (processing aborts
1017          * when a rule is satisfied):
1018          *
1019          *   . Report progress, if force_progress is 1 (ie. --progress).
1020          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
1021          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1022          *   . Report progress if isatty(2) is 1.
1023          **/
1024         if (force_progress >= 0)
1025                 transport->progress = !!force_progress;
1026         else
1027                 transport->progress = verbosity >= 0 && isatty(2);
1028 }
1029
1030 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1031 {
1032         int i;
1033
1034         fprintf(stderr, "The following submodule paths contain changes that can\n"
1035                         "not be found on any remote:\n");
1036         for (i = 0; i < needs_pushing->nr; i++)
1037                 printf("  %s\n", needs_pushing->items[i].string);
1038         fprintf(stderr, "\nPlease try\n\n"
1039                         "       git push --recurse-submodules=on-demand\n\n"
1040                         "or cd to the path and use\n\n"
1041                         "       git push\n\n"
1042                         "to push them to a remote.\n\n");
1043
1044         string_list_clear(needs_pushing, 0);
1045
1046         die("Aborting.");
1047 }
1048
1049 static int run_pre_push_hook(struct transport *transport,
1050                              struct ref *remote_refs)
1051 {
1052         int ret = 0, x;
1053         struct ref *r;
1054         struct child_process proc;
1055         struct strbuf buf;
1056         const char *argv[4];
1057
1058         if (!(argv[0] = find_hook("pre-push")))
1059                 return 0;
1060
1061         argv[1] = transport->remote->name;
1062         argv[2] = transport->url;
1063         argv[3] = NULL;
1064
1065         memset(&proc, 0, sizeof(proc));
1066         proc.argv = argv;
1067         proc.in = -1;
1068
1069         if (start_command(&proc)) {
1070                 finish_command(&proc);
1071                 return -1;
1072         }
1073
1074         strbuf_init(&buf, 256);
1075
1076         for (r = remote_refs; r; r = r->next) {
1077                 if (!r->peer_ref) continue;
1078                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1079                 if (r->status == REF_STATUS_UPTODATE) continue;
1080
1081                 strbuf_reset(&buf);
1082                 strbuf_addf( &buf, "%s %s %s %s\n",
1083                          r->peer_ref->name, sha1_to_hex(r->new_sha1),
1084                          r->name, sha1_to_hex(r->old_sha1));
1085
1086                 if (write_in_full(proc.in, buf.buf, buf.len) != buf.len) {
1087                         ret = -1;
1088                         break;
1089                 }
1090         }
1091
1092         strbuf_release(&buf);
1093
1094         x = close(proc.in);
1095         if (!ret)
1096                 ret = x;
1097
1098         x = finish_command(&proc);
1099         if (!ret)
1100                 ret = x;
1101
1102         return ret;
1103 }
1104
1105 int transport_push(struct transport *transport,
1106                    int refspec_nr, const char **refspec, int flags,
1107                    unsigned int *reject_reasons)
1108 {
1109         *reject_reasons = 0;
1110         transport_verify_remote_names(refspec_nr, refspec);
1111
1112         if (transport->push) {
1113                 /* Maybe FIXME. But no important transport uses this case. */
1114                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1115                         die("This transport does not support using --set-upstream");
1116
1117                 return transport->push(transport, refspec_nr, refspec, flags);
1118         } else if (transport->push_refs) {
1119                 struct ref *remote_refs =
1120                         transport->get_refs_list(transport, 1);
1121                 struct ref *local_refs = get_local_heads();
1122                 int match_flags = MATCH_REFS_NONE;
1123                 int verbose = (transport->verbose > 0);
1124                 int quiet = (transport->verbose < 0);
1125                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1126                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1127                 int push_ret, ret, err;
1128
1129                 if (flags & TRANSPORT_PUSH_ALL)
1130                         match_flags |= MATCH_REFS_ALL;
1131                 if (flags & TRANSPORT_PUSH_MIRROR)
1132                         match_flags |= MATCH_REFS_MIRROR;
1133                 if (flags & TRANSPORT_PUSH_PRUNE)
1134                         match_flags |= MATCH_REFS_PRUNE;
1135                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1136                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
1137
1138                 if (match_push_refs(local_refs, &remote_refs,
1139                                     refspec_nr, refspec, match_flags)) {
1140                         return -1;
1141                 }
1142
1143                 set_ref_status_for_push(remote_refs,
1144                         flags & TRANSPORT_PUSH_MIRROR,
1145                         flags & TRANSPORT_PUSH_FORCE);
1146
1147                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1148                         if (run_pre_push_hook(transport, remote_refs))
1149                                 return -1;
1150
1151                 if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
1152                         struct ref *ref = remote_refs;
1153                         for (; ref; ref = ref->next)
1154                                 if (!is_null_sha1(ref->new_sha1) &&
1155                                     !push_unpushed_submodules(ref->new_sha1,
1156                                             transport->remote->name))
1157                                     die ("Failed to push all needed submodules!");
1158                 }
1159
1160                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1161                               TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
1162                         struct ref *ref = remote_refs;
1163                         struct string_list needs_pushing;
1164
1165                         memset(&needs_pushing, 0, sizeof(struct string_list));
1166                         needs_pushing.strdup_strings = 1;
1167                         for (; ref; ref = ref->next)
1168                                 if (!is_null_sha1(ref->new_sha1) &&
1169                                     find_unpushed_submodules(ref->new_sha1,
1170                                             transport->remote->name, &needs_pushing))
1171                                         die_with_unpushed_submodules(&needs_pushing);
1172                 }
1173
1174                 push_ret = transport->push_refs(transport, remote_refs, flags);
1175                 err = push_had_errors(remote_refs);
1176                 ret = push_ret | err;
1177
1178                 if (!quiet || err)
1179                         transport_print_push_status(transport->url, remote_refs,
1180                                         verbose | porcelain, porcelain,
1181                                         reject_reasons);
1182
1183                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1184                         set_upstreams(transport, remote_refs, pretend);
1185
1186                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1187                         struct ref *ref;
1188                         for (ref = remote_refs; ref; ref = ref->next)
1189                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1190                 }
1191
1192                 if (porcelain && !push_ret)
1193                         puts("Done");
1194                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1195                         fprintf(stderr, "Everything up-to-date\n");
1196
1197                 return ret;
1198         }
1199         return 1;
1200 }
1201
1202 const struct ref *transport_get_remote_refs(struct transport *transport)
1203 {
1204         if (!transport->got_remote_refs) {
1205                 transport->remote_refs = transport->get_refs_list(transport, 0);
1206                 transport->got_remote_refs = 1;
1207         }
1208
1209         return transport->remote_refs;
1210 }
1211
1212 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1213 {
1214         int rc;
1215         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1216         struct ref **heads = NULL;
1217         struct ref *rm;
1218
1219         for (rm = refs; rm; rm = rm->next) {
1220                 nr_refs++;
1221                 if (rm->peer_ref &&
1222                     !is_null_sha1(rm->old_sha1) &&
1223                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1224                         continue;
1225                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1226                 heads[nr_heads++] = rm;
1227         }
1228
1229         if (!nr_heads) {
1230                 /*
1231                  * When deepening of a shallow repository is requested,
1232                  * then local and remote refs are likely to still be equal.
1233                  * Just feed them all to the fetch method in that case.
1234                  * This condition shouldn't be met in a non-deepening fetch
1235                  * (see builtin/fetch.c:quickfetch()).
1236                  */
1237                 heads = xmalloc(nr_refs * sizeof(*heads));
1238                 for (rm = refs; rm; rm = rm->next)
1239                         heads[nr_heads++] = rm;
1240         }
1241
1242         rc = transport->fetch(transport, nr_heads, heads);
1243
1244         free(heads);
1245         return rc;
1246 }
1247
1248 void transport_unlock_pack(struct transport *transport)
1249 {
1250         if (transport->pack_lockfile) {
1251                 unlink_or_warn(transport->pack_lockfile);
1252                 free(transport->pack_lockfile);
1253                 transport->pack_lockfile = NULL;
1254         }
1255 }
1256
1257 int transport_connect(struct transport *transport, const char *name,
1258                       const char *exec, int fd[2])
1259 {
1260         if (transport->connect)
1261                 return transport->connect(transport, name, exec, fd);
1262         else
1263                 die("Operation not supported by protocol");
1264 }
1265
1266 int transport_disconnect(struct transport *transport)
1267 {
1268         int ret = 0;
1269         if (transport->disconnect)
1270                 ret = transport->disconnect(transport);
1271         free(transport);
1272         return ret;
1273 }
1274
1275 /*
1276  * Strip username (and password) from a URL and return
1277  * it in a newly allocated string.
1278  */
1279 char *transport_anonymize_url(const char *url)
1280 {
1281         char *anon_url, *scheme_prefix, *anon_part;
1282         size_t anon_len, prefix_len = 0;
1283
1284         anon_part = strchr(url, '@');
1285         if (is_local(url) || !anon_part)
1286                 goto literal_copy;
1287
1288         anon_len = strlen(++anon_part);
1289         scheme_prefix = strstr(url, "://");
1290         if (!scheme_prefix) {
1291                 if (!strchr(anon_part, ':'))
1292                         /* cannot be "me@there:/path/name" */
1293                         goto literal_copy;
1294         } else {
1295                 const char *cp;
1296                 /* make sure scheme is reasonable */
1297                 for (cp = url; cp < scheme_prefix; cp++) {
1298                         switch (*cp) {
1299                                 /* RFC 1738 2.1 */
1300                         case '+': case '.': case '-':
1301                                 break; /* ok */
1302                         default:
1303                                 if (isalnum(*cp))
1304                                         break;
1305                                 /* it isn't */
1306                                 goto literal_copy;
1307                         }
1308                 }
1309                 /* @ past the first slash does not count */
1310                 cp = strchr(scheme_prefix + 3, '/');
1311                 if (cp && cp < anon_part)
1312                         goto literal_copy;
1313                 prefix_len = scheme_prefix - url + 3;
1314         }
1315         anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1316         memcpy(anon_url, url, prefix_len);
1317         memcpy(anon_url + prefix_len, anon_part, anon_len);
1318         return anon_url;
1319 literal_copy:
1320         return xstrdup(url);
1321 }
1322
1323 struct alternate_refs_data {
1324         alternate_ref_fn *fn;
1325         void *data;
1326 };
1327
1328 static int refs_from_alternate_cb(struct alternate_object_database *e,
1329                                   void *data)
1330 {
1331         char *other;
1332         size_t len;
1333         struct remote *remote;
1334         struct transport *transport;
1335         const struct ref *extra;
1336         struct alternate_refs_data *cb = data;
1337
1338         e->name[-1] = '\0';
1339         other = xstrdup(real_path(e->base));
1340         e->name[-1] = '/';
1341         len = strlen(other);
1342
1343         while (other[len-1] == '/')
1344                 other[--len] = '\0';
1345         if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1346                 return 0;
1347         /* Is this a git repository with refs? */
1348         memcpy(other + len - 8, "/refs", 6);
1349         if (!is_directory(other))
1350                 return 0;
1351         other[len - 8] = '\0';
1352         remote = remote_get(other);
1353         transport = transport_get(remote, other);
1354         for (extra = transport_get_remote_refs(transport);
1355              extra;
1356              extra = extra->next)
1357                 cb->fn(extra, cb->data);
1358         transport_disconnect(transport);
1359         free(other);
1360         return 0;
1361 }
1362
1363 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1364 {
1365         struct alternate_refs_data cb;
1366         cb.fn = fn;
1367         cb.data = data;
1368         foreach_alt_odb(refs_from_alternate_cb, &cb);
1369 }