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