Documentation/git-tools: improve discoverability of Git wiki
[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 "remote.h"
7 #include "connect.h"
8 #include "send-pack.h"
9 #include "walker.h"
10 #include "bundle.h"
11 #include "dir.h"
12 #include "refs.h"
13 #include "branch.h"
14 #include "url.h"
15 #include "submodule.h"
16 #include "string-list.h"
17 #include "sha1-array.h"
18
19 /* rsync support */
20
21 /*
22  * We copy packed-refs and refs/ into a temporary file, then read the
23  * loose refs recursively (sorting whenever possible), and then inserting
24  * those packed refs that are not yet in the list (not validating, but
25  * assuming that the file is sorted).
26  *
27  * Appears refactoring this from refs.c is too cumbersome.
28  */
29
30 static int str_cmp(const void *a, const void *b)
31 {
32         const char *s1 = a;
33         const char *s2 = b;
34
35         return strcmp(s1, s2);
36 }
37
38 /* path->buf + name_offset is expected to point to "refs/" */
39
40 static int read_loose_refs(struct strbuf *path, int name_offset,
41                 struct ref **tail)
42 {
43         DIR *dir = opendir(path->buf);
44         struct dirent *de;
45         struct {
46                 char **entries;
47                 int nr, alloc;
48         } list;
49         int i, pathlen;
50
51         if (!dir)
52                 return -1;
53
54         memset (&list, 0, sizeof(list));
55
56         while ((de = readdir(dir))) {
57                 if (is_dot_or_dotdot(de->d_name))
58                         continue;
59                 ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
60                 list.entries[list.nr++] = xstrdup(de->d_name);
61         }
62         closedir(dir);
63
64         /* sort the list */
65
66         qsort(list.entries, list.nr, sizeof(char *), str_cmp);
67
68         pathlen = path->len;
69         strbuf_addch(path, '/');
70
71         for (i = 0; i < list.nr; i++, strbuf_setlen(path, pathlen + 1)) {
72                 strbuf_addstr(path, list.entries[i]);
73                 if (read_loose_refs(path, name_offset, tail)) {
74                         int fd = open(path->buf, O_RDONLY);
75                         char buffer[40];
76                         struct ref *next;
77
78                         if (fd < 0)
79                                 continue;
80                         next = alloc_ref(path->buf + name_offset);
81                         if (read_in_full(fd, buffer, 40) != 40 ||
82                                         get_sha1_hex(buffer, next->old_sha1)) {
83                                 close(fd);
84                                 free(next);
85                                 continue;
86                         }
87                         close(fd);
88                         (*tail)->next = next;
89                         *tail = next;
90                 }
91         }
92         strbuf_setlen(path, pathlen);
93
94         for (i = 0; i < list.nr; i++)
95                 free(list.entries[i]);
96         free(list.entries);
97
98         return 0;
99 }
100
101 /* insert the packed refs for which no loose refs were found */
102
103 static void insert_packed_refs(const char *packed_refs, struct ref **list)
104 {
105         FILE *f = fopen(packed_refs, "r");
106         static char buffer[PATH_MAX];
107
108         if (!f)
109                 return;
110
111         for (;;) {
112                 int cmp = 0; /* assigned before used */
113                 int len;
114
115                 if (!fgets(buffer, sizeof(buffer), f)) {
116                         fclose(f);
117                         return;
118                 }
119
120                 if (hexval(buffer[0]) > 0xf)
121                         continue;
122                 len = strlen(buffer);
123                 if (len && buffer[len - 1] == '\n')
124                         buffer[--len] = '\0';
125                 if (len < 41)
126                         continue;
127                 while ((*list)->next &&
128                                 (cmp = strcmp(buffer + 41,
129                                       (*list)->next->name)) > 0)
130                         list = &(*list)->next;
131                 if (!(*list)->next || cmp < 0) {
132                         struct ref *next = alloc_ref(buffer + 41);
133                         buffer[40] = '\0';
134                         if (get_sha1_hex(buffer, next->old_sha1)) {
135                                 warning ("invalid SHA-1: %s", buffer);
136                                 free(next);
137                                 continue;
138                         }
139                         next->next = (*list)->next;
140                         (*list)->next = next;
141                         list = &(*list)->next;
142                 }
143         }
144 }
145
146 static void set_upstreams(struct transport *transport, struct ref *refs,
147         int pretend)
148 {
149         struct ref *ref;
150         for (ref = refs; ref; ref = ref->next) {
151                 const char *localname;
152                 const char *tmp;
153                 const char *remotename;
154                 unsigned char sha[20];
155                 int flag = 0;
156                 /*
157                  * Check suitability for tracking. Must be successful /
158                  * already up-to-date ref create/modify (not delete).
159                  */
160                 if (ref->status != REF_STATUS_OK &&
161                         ref->status != REF_STATUS_UPTODATE)
162                         continue;
163                 if (!ref->peer_ref)
164                         continue;
165                 if (is_null_sha1(ref->new_sha1))
166                         continue;
167
168                 /* Follow symbolic refs (mainly for HEAD). */
169                 localname = ref->peer_ref->name;
170                 remotename = ref->name;
171                 tmp = resolve_ref_unsafe(localname, RESOLVE_REF_READING,
172                                          sha, &flag);
173                 if (tmp && flag & REF_ISSYMREF &&
174                         starts_with(tmp, "refs/heads/"))
175                         localname = tmp;
176
177                 /* Both source and destination must be local branches. */
178                 if (!localname || !starts_with(localname, "refs/heads/"))
179                         continue;
180                 if (!remotename || !starts_with(remotename, "refs/heads/"))
181                         continue;
182
183                 if (!pretend)
184                         install_branch_config(BRANCH_CONFIG_VERBOSE,
185                                 localname + 11, transport->remote->name,
186                                 remotename);
187                 else
188                         printf("Would set upstream of '%s' to '%s' of '%s'\n",
189                                 localname + 11, remotename + 11,
190                                 transport->remote->name);
191         }
192 }
193
194 static const char *rsync_url(const char *url)
195 {
196         if (!starts_with(url, "rsync://"))
197                 skip_prefix(url, "rsync:", &url);
198         return url;
199 }
200
201 static struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
202 {
203         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
204         struct ref dummy = {NULL}, *tail = &dummy;
205         struct child_process rsync = CHILD_PROCESS_INIT;
206         const char *args[5];
207         int temp_dir_len;
208
209         if (for_push)
210                 return NULL;
211
212         /* copy the refs to the temporary directory */
213
214         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
215         if (!mkdtemp(temp_dir.buf))
216                 die_errno ("Could not make temporary directory");
217         temp_dir_len = temp_dir.len;
218
219         strbuf_addstr(&buf, rsync_url(transport->url));
220         strbuf_addstr(&buf, "/refs");
221
222         rsync.argv = args;
223         rsync.stdout_to_stderr = 1;
224         args[0] = "rsync";
225         args[1] = (transport->verbose > 1) ? "-rv" : "-r";
226         args[2] = buf.buf;
227         args[3] = temp_dir.buf;
228         args[4] = NULL;
229
230         if (run_command(&rsync))
231                 die ("Could not run rsync to get refs");
232
233         strbuf_reset(&buf);
234         strbuf_addstr(&buf, rsync_url(transport->url));
235         strbuf_addstr(&buf, "/packed-refs");
236
237         args[2] = buf.buf;
238
239         if (run_command(&rsync))
240                 die ("Could not run rsync to get refs");
241
242         /* read the copied refs */
243
244         strbuf_addstr(&temp_dir, "/refs");
245         read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
246         strbuf_setlen(&temp_dir, temp_dir_len);
247
248         tail = &dummy;
249         strbuf_addstr(&temp_dir, "/packed-refs");
250         insert_packed_refs(temp_dir.buf, &tail);
251         strbuf_setlen(&temp_dir, temp_dir_len);
252
253         if (remove_dir_recursively(&temp_dir, 0))
254                 warning ("Error removing temporary directory %s.",
255                                 temp_dir.buf);
256
257         strbuf_release(&buf);
258         strbuf_release(&temp_dir);
259
260         return dummy.next;
261 }
262
263 static int fetch_objs_via_rsync(struct transport *transport,
264                                 int nr_objs, struct ref **to_fetch)
265 {
266         struct child_process rsync = CHILD_PROCESS_INIT;
267
268         rsync.stdout_to_stderr = 1;
269         argv_array_push(&rsync.args, "rsync");
270         argv_array_push(&rsync.args, (transport->verbose > 1) ? "-rv" : "-r");
271         argv_array_push(&rsync.args, "--ignore-existing");
272         argv_array_push(&rsync.args, "--exclude");
273         argv_array_push(&rsync.args, "info");
274         argv_array_pushf(&rsync.args, "%s/objects/", rsync_url(transport->url));
275         argv_array_push(&rsync.args, get_object_directory());
276
277         /* NEEDSWORK: handle one level of alternates */
278         return run_command(&rsync);
279 }
280
281 static int write_one_ref(const char *name, const unsigned char *sha1,
282                 int flags, void *data)
283 {
284         struct strbuf *buf = data;
285         int len = buf->len;
286
287         /* when called via for_each_ref(), flags is non-zero */
288         if (flags && !starts_with(name, "refs/heads/") &&
289                         !starts_with(name, "refs/tags/"))
290                 return 0;
291
292         strbuf_addstr(buf, name);
293         if (safe_create_leading_directories(buf->buf) ||
294             write_file(buf->buf, 0, "%s\n", sha1_to_hex(sha1)))
295                 return error("problems writing temporary file %s: %s",
296                              buf->buf, strerror(errno));
297         strbuf_setlen(buf, len);
298         return 0;
299 }
300
301 static int write_refs_to_temp_dir(struct strbuf *temp_dir,
302                 int refspec_nr, const char **refspec)
303 {
304         int i;
305
306         for (i = 0; i < refspec_nr; i++) {
307                 unsigned char sha1[20];
308                 char *ref;
309
310                 if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
311                         return error("Could not get ref %s", refspec[i]);
312
313                 if (write_one_ref(ref, sha1, 0, temp_dir)) {
314                         free(ref);
315                         return -1;
316                 }
317                 free(ref);
318         }
319         return 0;
320 }
321
322 static int rsync_transport_push(struct transport *transport,
323                 int refspec_nr, const char **refspec, int flags)
324 {
325         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
326         int result = 0, i;
327         struct child_process rsync = CHILD_PROCESS_INIT;
328         const char *args[10];
329
330         if (flags & TRANSPORT_PUSH_MIRROR)
331                 return error("rsync transport does not support mirror mode");
332
333         /* first push the objects */
334
335         strbuf_addstr(&buf, rsync_url(transport->url));
336         strbuf_addch(&buf, '/');
337
338         rsync.argv = args;
339         rsync.stdout_to_stderr = 1;
340         i = 0;
341         args[i++] = "rsync";
342         args[i++] = "-a";
343         if (flags & TRANSPORT_PUSH_DRY_RUN)
344                 args[i++] = "--dry-run";
345         if (transport->verbose > 1)
346                 args[i++] = "-v";
347         args[i++] = "--ignore-existing";
348         args[i++] = "--exclude";
349         args[i++] = "info";
350         args[i++] = get_object_directory();
351         args[i++] = buf.buf;
352         args[i++] = NULL;
353
354         if (run_command(&rsync))
355                 return error("Could not push objects to %s",
356                                 rsync_url(transport->url));
357
358         /* copy the refs to the temporary directory; they could be packed. */
359
360         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
361         if (!mkdtemp(temp_dir.buf))
362                 die_errno ("Could not make temporary directory");
363         strbuf_addch(&temp_dir, '/');
364
365         if (flags & TRANSPORT_PUSH_ALL) {
366                 if (for_each_ref(write_one_ref, &temp_dir))
367                         return -1;
368         } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
369                 return -1;
370
371         i = 2;
372         if (flags & TRANSPORT_PUSH_DRY_RUN)
373                 args[i++] = "--dry-run";
374         if (!(flags & TRANSPORT_PUSH_FORCE))
375                 args[i++] = "--ignore-existing";
376         args[i++] = temp_dir.buf;
377         args[i++] = rsync_url(transport->url);
378         args[i++] = NULL;
379         if (run_command(&rsync))
380                 result = error("Could not push to %s",
381                                 rsync_url(transport->url));
382
383         if (remove_dir_recursively(&temp_dir, 0))
384                 warning ("Could not remove temporary directory %s.",
385                                 temp_dir.buf);
386
387         strbuf_release(&buf);
388         strbuf_release(&temp_dir);
389
390         return result;
391 }
392
393 struct bundle_transport_data {
394         int fd;
395         struct bundle_header header;
396 };
397
398 static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
399 {
400         struct bundle_transport_data *data = transport->data;
401         struct ref *result = NULL;
402         int i;
403
404         if (for_push)
405                 return NULL;
406
407         if (data->fd > 0)
408                 close(data->fd);
409         data->fd = read_bundle_header(transport->url, &data->header);
410         if (data->fd < 0)
411                 die ("Could not read bundle '%s'.", transport->url);
412         for (i = 0; i < data->header.references.nr; i++) {
413                 struct ref_list_entry *e = data->header.references.list + i;
414                 struct ref *ref = alloc_ref(e->name);
415                 hashcpy(ref->old_sha1, e->sha1);
416                 ref->next = result;
417                 result = ref;
418         }
419         return result;
420 }
421
422 static int fetch_refs_from_bundle(struct transport *transport,
423                                int nr_heads, struct ref **to_fetch)
424 {
425         struct bundle_transport_data *data = transport->data;
426         return unbundle(&data->header, data->fd,
427                         transport->progress ? BUNDLE_VERBOSE : 0);
428 }
429
430 static int close_bundle(struct transport *transport)
431 {
432         struct bundle_transport_data *data = transport->data;
433         if (data->fd > 0)
434                 close(data->fd);
435         free(data);
436         return 0;
437 }
438
439 struct git_transport_data {
440         struct git_transport_options options;
441         struct child_process *conn;
442         int fd[2];
443         unsigned got_remote_heads : 1;
444         struct sha1_array extra_have;
445         struct sha1_array shallow;
446 };
447
448 static int set_git_option(struct git_transport_options *opts,
449                           const char *name, const char *value)
450 {
451         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
452                 opts->uploadpack = value;
453                 return 0;
454         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
455                 opts->receivepack = value;
456                 return 0;
457         } else if (!strcmp(name, TRANS_OPT_THIN)) {
458                 opts->thin = !!value;
459                 return 0;
460         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
461                 opts->followtags = !!value;
462                 return 0;
463         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
464                 opts->keep = !!value;
465                 return 0;
466         } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
467                 opts->update_shallow = !!value;
468                 return 0;
469         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
470                 if (!value)
471                         opts->depth = 0;
472                 else {
473                         char *end;
474                         opts->depth = strtol(value, &end, 0);
475                         if (*end)
476                                 die("transport: invalid depth option '%s'", value);
477                 }
478                 return 0;
479         } else if (!strcmp(name, TRANS_OPT_PUSH_CERT)) {
480                 opts->push_cert = !!value;
481                 return 0;
482         }
483         return 1;
484 }
485
486 static int connect_setup(struct transport *transport, int for_push, int verbose)
487 {
488         struct git_transport_data *data = transport->data;
489
490         if (data->conn)
491                 return 0;
492
493         data->conn = git_connect(data->fd, transport->url,
494                                  for_push ? data->options.receivepack :
495                                  data->options.uploadpack,
496                                  verbose ? CONNECT_VERBOSE : 0);
497
498         return 0;
499 }
500
501 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
502 {
503         struct git_transport_data *data = transport->data;
504         struct ref *refs;
505
506         connect_setup(transport, for_push, 0);
507         get_remote_heads(data->fd[0], NULL, 0, &refs,
508                          for_push ? REF_NORMAL : 0,
509                          &data->extra_have,
510                          &data->shallow);
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         const struct ref *refs;
521         char *dest = xstrdup(transport->url);
522         struct fetch_pack_args args;
523         struct ref *refs_tmp = NULL;
524
525         memset(&args, 0, sizeof(args));
526         args.uploadpack = data->options.uploadpack;
527         args.keep_pack = data->options.keep;
528         args.lock_pack = 1;
529         args.use_thin_pack = data->options.thin;
530         args.include_tag = data->options.followtags;
531         args.verbose = (transport->verbose > 1);
532         args.quiet = (transport->verbose < 0);
533         args.no_progress = !transport->progress;
534         args.depth = data->options.depth;
535         args.check_self_contained_and_connected =
536                 data->options.check_self_contained_and_connected;
537         args.cloning = transport->cloning;
538         args.update_shallow = data->options.update_shallow;
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,
543                                  NULL, &data->shallow);
544                 data->got_remote_heads = 1;
545         }
546
547         refs = fetch_pack(&args, data->fd, data->conn,
548                           refs_tmp ? refs_tmp : transport->remote_refs,
549                           dest, to_fetch, nr_heads, &data->shallow,
550                           &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         data->options.self_contained_and_connected =
558                 args.self_contained_and_connected;
559
560         free_refs(refs_tmp);
561
562         free(dest);
563         return (refs ? 0 : -1);
564 }
565
566 static int push_had_errors(struct ref *ref)
567 {
568         for (; ref; ref = ref->next) {
569                 switch (ref->status) {
570                 case REF_STATUS_NONE:
571                 case REF_STATUS_UPTODATE:
572                 case REF_STATUS_OK:
573                         break;
574                 default:
575                         return 1;
576                 }
577         }
578         return 0;
579 }
580
581 int transport_refs_pushed(struct ref *ref)
582 {
583         for (; ref; ref = ref->next) {
584                 switch(ref->status) {
585                 case REF_STATUS_NONE:
586                 case REF_STATUS_UPTODATE:
587                         break;
588                 default:
589                         return 1;
590                 }
591         }
592         return 0;
593 }
594
595 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
596 {
597         struct refspec rs;
598
599         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
600                 return;
601
602         rs.src = ref->name;
603         rs.dst = NULL;
604
605         if (!remote_find_tracking(remote, &rs)) {
606                 if (verbose)
607                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
608                 if (ref->deletion) {
609                         delete_ref(rs.dst, NULL, 0);
610                 } else
611                         update_ref("update by push", rs.dst,
612                                         ref->new_sha1, NULL, 0, 0);
613                 free(rs.dst);
614         }
615 }
616
617 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
618 {
619         if (porcelain) {
620                 if (from)
621                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
622                 else
623                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
624                 if (msg)
625                         fprintf(stdout, "%s (%s)\n", summary, msg);
626                 else
627                         fprintf(stdout, "%s\n", summary);
628         } else {
629                 fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
630                 if (from)
631                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
632                 else
633                         fputs(prettify_refname(to->name), stderr);
634                 if (msg) {
635                         fputs(" (", stderr);
636                         fputs(msg, stderr);
637                         fputc(')', stderr);
638                 }
639                 fputc('\n', stderr);
640         }
641 }
642
643 static const char *status_abbrev(unsigned char sha1[20])
644 {
645         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
646 }
647
648 static void print_ok_ref_status(struct ref *ref, int porcelain)
649 {
650         if (ref->deletion)
651                 print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
652         else if (is_null_sha1(ref->old_sha1))
653                 print_ref_status('*',
654                         (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
655                         "[new branch]"),
656                         ref, ref->peer_ref, NULL, porcelain);
657         else {
658                 char quickref[84];
659                 char type;
660                 const char *msg;
661
662                 strcpy(quickref, status_abbrev(ref->old_sha1));
663                 if (ref->forced_update) {
664                         strcat(quickref, "...");
665                         type = '+';
666                         msg = "forced update";
667                 } else {
668                         strcat(quickref, "..");
669                         type = ' ';
670                         msg = NULL;
671                 }
672                 strcat(quickref, status_abbrev(ref->new_sha1));
673
674                 print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
675         }
676 }
677
678 static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
679 {
680         if (!count)
681                 fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
682
683         switch(ref->status) {
684         case REF_STATUS_NONE:
685                 print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
686                 break;
687         case REF_STATUS_REJECT_NODELETE:
688                 print_ref_status('!', "[rejected]", ref, NULL,
689                                                  "remote does not support deleting refs", porcelain);
690                 break;
691         case REF_STATUS_UPTODATE:
692                 print_ref_status('=', "[up to date]", ref,
693                                                  ref->peer_ref, NULL, porcelain);
694                 break;
695         case REF_STATUS_REJECT_NONFASTFORWARD:
696                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
697                                                  "non-fast-forward", porcelain);
698                 break;
699         case REF_STATUS_REJECT_ALREADY_EXISTS:
700                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
701                                                  "already exists", porcelain);
702                 break;
703         case REF_STATUS_REJECT_FETCH_FIRST:
704                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
705                                                  "fetch first", porcelain);
706                 break;
707         case REF_STATUS_REJECT_NEEDS_FORCE:
708                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
709                                                  "needs force", porcelain);
710                 break;
711         case REF_STATUS_REJECT_STALE:
712                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
713                                                  "stale info", porcelain);
714                 break;
715         case REF_STATUS_REJECT_SHALLOW:
716                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
717                                                  "new shallow roots not allowed", porcelain);
718                 break;
719         case REF_STATUS_REMOTE_REJECT:
720                 print_ref_status('!', "[remote rejected]", ref,
721                                                  ref->deletion ? NULL : ref->peer_ref,
722                                                  ref->remote_status, porcelain);
723                 break;
724         case REF_STATUS_EXPECTING_REPORT:
725                 print_ref_status('!', "[remote failure]", ref,
726                                                  ref->deletion ? NULL : ref->peer_ref,
727                                                  "remote failed to report status", porcelain);
728                 break;
729         case REF_STATUS_OK:
730                 print_ok_ref_status(ref, porcelain);
731                 break;
732         }
733
734         return 1;
735 }
736
737 void transport_print_push_status(const char *dest, struct ref *refs,
738                                   int verbose, int porcelain, unsigned int *reject_reasons)
739 {
740         struct ref *ref;
741         int n = 0;
742         unsigned char head_sha1[20];
743         char *head;
744
745         head = resolve_refdup("HEAD", RESOLVE_REF_READING, head_sha1, NULL);
746
747         if (verbose) {
748                 for (ref = refs; ref; ref = ref->next)
749                         if (ref->status == REF_STATUS_UPTODATE)
750                                 n += print_one_push_status(ref, dest, n, porcelain);
751         }
752
753         for (ref = refs; ref; ref = ref->next)
754                 if (ref->status == REF_STATUS_OK)
755                         n += print_one_push_status(ref, dest, n, porcelain);
756
757         *reject_reasons = 0;
758         for (ref = refs; ref; ref = ref->next) {
759                 if (ref->status != REF_STATUS_NONE &&
760                     ref->status != REF_STATUS_UPTODATE &&
761                     ref->status != REF_STATUS_OK)
762                         n += print_one_push_status(ref, dest, n, porcelain);
763                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
764                         if (head != NULL && !strcmp(head, ref->name))
765                                 *reject_reasons |= REJECT_NON_FF_HEAD;
766                         else
767                                 *reject_reasons |= REJECT_NON_FF_OTHER;
768                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
769                         *reject_reasons |= REJECT_ALREADY_EXISTS;
770                 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
771                         *reject_reasons |= REJECT_FETCH_FIRST;
772                 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
773                         *reject_reasons |= REJECT_NEEDS_FORCE;
774                 }
775         }
776         free(head);
777 }
778
779 void transport_verify_remote_names(int nr_heads, const char **heads)
780 {
781         int i;
782
783         for (i = 0; i < nr_heads; i++) {
784                 const char *local = heads[i];
785                 const char *remote = strrchr(heads[i], ':');
786
787                 if (*local == '+')
788                         local++;
789
790                 /* A matching refspec is okay.  */
791                 if (remote == local && remote[1] == '\0')
792                         continue;
793
794                 remote = remote ? (remote + 1) : local;
795                 if (check_refname_format(remote,
796                                 REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
797                         die("remote part of refspec is not a valid name in %s",
798                                 heads[i]);
799         }
800 }
801
802 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
803 {
804         struct git_transport_data *data = transport->data;
805         struct send_pack_args args;
806         int ret;
807
808         if (!data->got_remote_heads) {
809                 struct ref *tmp_refs;
810                 connect_setup(transport, 1, 0);
811
812                 get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
813                                  NULL, &data->shallow);
814                 data->got_remote_heads = 1;
815         }
816
817         memset(&args, 0, sizeof(args));
818         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
819         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
820         args.use_thin_pack = data->options.thin;
821         args.verbose = (transport->verbose > 0);
822         args.quiet = (transport->verbose < 0);
823         args.progress = transport->progress;
824         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
825         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
826         args.push_cert = !!(flags & TRANSPORT_PUSH_CERT);
827         args.url = transport->url;
828
829         ret = send_pack(&args, data->fd, data->conn, remote_refs,
830                         &data->extra_have);
831
832         close(data->fd[1]);
833         close(data->fd[0]);
834         ret |= finish_connect(data->conn);
835         data->conn = NULL;
836         data->got_remote_heads = 0;
837
838         return ret;
839 }
840
841 static int connect_git(struct transport *transport, const char *name,
842                        const char *executable, int fd[2])
843 {
844         struct git_transport_data *data = transport->data;
845         data->conn = git_connect(data->fd, transport->url,
846                                  executable, 0);
847         fd[0] = data->fd[0];
848         fd[1] = data->fd[1];
849         return 0;
850 }
851
852 static int disconnect_git(struct transport *transport)
853 {
854         struct git_transport_data *data = transport->data;
855         if (data->conn) {
856                 if (data->got_remote_heads)
857                         packet_flush(data->fd[1]);
858                 close(data->fd[0]);
859                 close(data->fd[1]);
860                 finish_connect(data->conn);
861         }
862
863         free(data);
864         return 0;
865 }
866
867 void transport_take_over(struct transport *transport,
868                          struct child_process *child)
869 {
870         struct git_transport_data *data;
871
872         if (!transport->smart_options)
873                 die("Bug detected: Taking over transport requires non-NULL "
874                     "smart_options field.");
875
876         data = xcalloc(1, sizeof(*data));
877         data->options = *transport->smart_options;
878         data->conn = child;
879         data->fd[0] = data->conn->out;
880         data->fd[1] = data->conn->in;
881         data->got_remote_heads = 0;
882         transport->data = data;
883
884         transport->set_option = NULL;
885         transport->get_refs_list = get_refs_via_connect;
886         transport->fetch = fetch_refs_via_pack;
887         transport->push = NULL;
888         transport->push_refs = git_transport_push;
889         transport->disconnect = disconnect_git;
890         transport->smart_options = &(data->options);
891
892         transport->cannot_reuse = 1;
893 }
894
895 static int is_file(const char *url)
896 {
897         struct stat buf;
898         if (stat(url, &buf))
899                 return 0;
900         return S_ISREG(buf.st_mode);
901 }
902
903 static int external_specification_len(const char *url)
904 {
905         return strchr(url, ':') - url;
906 }
907
908 struct transport *transport_get(struct remote *remote, const char *url)
909 {
910         const char *helper;
911         struct transport *ret = xcalloc(1, sizeof(*ret));
912
913         ret->progress = isatty(2);
914
915         if (!remote)
916                 die("No remote provided to transport_get()");
917
918         ret->got_remote_refs = 0;
919         ret->remote = remote;
920         helper = remote->foreign_vcs;
921
922         if (!url && remote->url)
923                 url = remote->url[0];
924         ret->url = url;
925
926         /* maybe it is a foreign URL? */
927         if (url) {
928                 const char *p = url;
929
930                 while (is_urlschemechar(p == url, *p))
931                         p++;
932                 if (starts_with(p, "::"))
933                         helper = xstrndup(url, p - url);
934         }
935
936         if (helper) {
937                 transport_helper_init(ret, helper);
938         } else if (starts_with(url, "rsync:")) {
939                 ret->get_refs_list = get_refs_via_rsync;
940                 ret->fetch = fetch_objs_via_rsync;
941                 ret->push = rsync_transport_push;
942                 ret->smart_options = NULL;
943         } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
944                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
945                 ret->data = data;
946                 ret->get_refs_list = get_refs_from_bundle;
947                 ret->fetch = fetch_refs_from_bundle;
948                 ret->disconnect = close_bundle;
949                 ret->smart_options = NULL;
950         } else if (!is_url(url)
951                 || starts_with(url, "file://")
952                 || starts_with(url, "git://")
953                 || starts_with(url, "ssh://")
954                 || starts_with(url, "git+ssh://")
955                 || starts_with(url, "ssh+git://")) {
956                 /* These are builtin smart transports. */
957                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
958                 ret->data = data;
959                 ret->set_option = NULL;
960                 ret->get_refs_list = get_refs_via_connect;
961                 ret->fetch = fetch_refs_via_pack;
962                 ret->push_refs = git_transport_push;
963                 ret->connect = connect_git;
964                 ret->disconnect = disconnect_git;
965                 ret->smart_options = &(data->options);
966
967                 data->conn = NULL;
968                 data->got_remote_heads = 0;
969         } else {
970                 /* Unknown protocol in URL. Pass to external handler. */
971                 int len = external_specification_len(url);
972                 char *handler = xmalloc(len + 1);
973                 handler[len] = 0;
974                 strncpy(handler, url, len);
975                 transport_helper_init(ret, handler);
976         }
977
978         if (ret->smart_options) {
979                 ret->smart_options->thin = 1;
980                 ret->smart_options->uploadpack = "git-upload-pack";
981                 if (remote->uploadpack)
982                         ret->smart_options->uploadpack = remote->uploadpack;
983                 ret->smart_options->receivepack = "git-receive-pack";
984                 if (remote->receivepack)
985                         ret->smart_options->receivepack = remote->receivepack;
986         }
987
988         return ret;
989 }
990
991 int transport_set_option(struct transport *transport,
992                          const char *name, const char *value)
993 {
994         int git_reports = 1, protocol_reports = 1;
995
996         if (transport->smart_options)
997                 git_reports = set_git_option(transport->smart_options,
998                                              name, value);
999
1000         if (transport->set_option)
1001                 protocol_reports = transport->set_option(transport, name,
1002                                                         value);
1003
1004         /* If either report is 0, report 0 (success). */
1005         if (!git_reports || !protocol_reports)
1006                 return 0;
1007         /* If either reports -1 (invalid value), report -1. */
1008         if ((git_reports == -1) || (protocol_reports == -1))
1009                 return -1;
1010         /* Otherwise if both report unknown, report unknown. */
1011         return 1;
1012 }
1013
1014 void transport_set_verbosity(struct transport *transport, int verbosity,
1015         int force_progress)
1016 {
1017         if (verbosity >= 1)
1018                 transport->verbose = verbosity <= 3 ? verbosity : 3;
1019         if (verbosity < 0)
1020                 transport->verbose = -1;
1021
1022         /**
1023          * Rules used to determine whether to report progress (processing aborts
1024          * when a rule is satisfied):
1025          *
1026          *   . Report progress, if force_progress is 1 (ie. --progress).
1027          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
1028          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1029          *   . Report progress if isatty(2) is 1.
1030          **/
1031         if (force_progress >= 0)
1032                 transport->progress = !!force_progress;
1033         else
1034                 transport->progress = verbosity >= 0 && isatty(2);
1035 }
1036
1037 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1038 {
1039         int i;
1040
1041         fprintf(stderr, "The following submodule paths contain changes that can\n"
1042                         "not be found on any remote:\n");
1043         for (i = 0; i < needs_pushing->nr; i++)
1044                 printf("  %s\n", needs_pushing->items[i].string);
1045         fprintf(stderr, "\nPlease try\n\n"
1046                         "       git push --recurse-submodules=on-demand\n\n"
1047                         "or cd to the path and use\n\n"
1048                         "       git push\n\n"
1049                         "to push them to a remote.\n\n");
1050
1051         string_list_clear(needs_pushing, 0);
1052
1053         die("Aborting.");
1054 }
1055
1056 static int run_pre_push_hook(struct transport *transport,
1057                              struct ref *remote_refs)
1058 {
1059         int ret = 0, x;
1060         struct ref *r;
1061         struct child_process proc = CHILD_PROCESS_INIT;
1062         struct strbuf buf;
1063         const char *argv[4];
1064
1065         if (!(argv[0] = find_hook("pre-push")))
1066                 return 0;
1067
1068         argv[1] = transport->remote->name;
1069         argv[2] = transport->url;
1070         argv[3] = NULL;
1071
1072         proc.argv = argv;
1073         proc.in = -1;
1074
1075         if (start_command(&proc)) {
1076                 finish_command(&proc);
1077                 return -1;
1078         }
1079
1080         strbuf_init(&buf, 256);
1081
1082         for (r = remote_refs; r; r = r->next) {
1083                 if (!r->peer_ref) continue;
1084                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1085                 if (r->status == REF_STATUS_REJECT_STALE) continue;
1086                 if (r->status == REF_STATUS_UPTODATE) continue;
1087
1088                 strbuf_reset(&buf);
1089                 strbuf_addf( &buf, "%s %s %s %s\n",
1090                          r->peer_ref->name, sha1_to_hex(r->new_sha1),
1091                          r->name, sha1_to_hex(r->old_sha1));
1092
1093                 if (write_in_full(proc.in, buf.buf, buf.len) != buf.len) {
1094                         ret = -1;
1095                         break;
1096                 }
1097         }
1098
1099         strbuf_release(&buf);
1100
1101         x = close(proc.in);
1102         if (!ret)
1103                 ret = x;
1104
1105         x = finish_command(&proc);
1106         if (!ret)
1107                 ret = x;
1108
1109         return ret;
1110 }
1111
1112 int transport_push(struct transport *transport,
1113                    int refspec_nr, const char **refspec, int flags,
1114                    unsigned int *reject_reasons)
1115 {
1116         *reject_reasons = 0;
1117         transport_verify_remote_names(refspec_nr, refspec);
1118
1119         if (transport->push) {
1120                 /* Maybe FIXME. But no important transport uses this case. */
1121                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1122                         die("This transport does not support using --set-upstream");
1123
1124                 return transport->push(transport, refspec_nr, refspec, flags);
1125         } else if (transport->push_refs) {
1126                 struct ref *remote_refs;
1127                 struct ref *local_refs = get_local_heads();
1128                 int match_flags = MATCH_REFS_NONE;
1129                 int verbose = (transport->verbose > 0);
1130                 int quiet = (transport->verbose < 0);
1131                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1132                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1133                 int push_ret, ret, err;
1134
1135                 if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
1136                         return -1;
1137
1138                 remote_refs = transport->get_refs_list(transport, 1);
1139
1140                 if (flags & TRANSPORT_PUSH_ALL)
1141                         match_flags |= MATCH_REFS_ALL;
1142                 if (flags & TRANSPORT_PUSH_MIRROR)
1143                         match_flags |= MATCH_REFS_MIRROR;
1144                 if (flags & TRANSPORT_PUSH_PRUNE)
1145                         match_flags |= MATCH_REFS_PRUNE;
1146                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1147                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
1148
1149                 if (match_push_refs(local_refs, &remote_refs,
1150                                     refspec_nr, refspec, match_flags)) {
1151                         return -1;
1152                 }
1153
1154                 if (transport->smart_options &&
1155                     transport->smart_options->cas &&
1156                     !is_empty_cas(transport->smart_options->cas))
1157                         apply_push_cas(transport->smart_options->cas,
1158                                        transport->remote, remote_refs);
1159
1160                 set_ref_status_for_push(remote_refs,
1161                         flags & TRANSPORT_PUSH_MIRROR,
1162                         flags & TRANSPORT_PUSH_FORCE);
1163
1164                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1165                         if (run_pre_push_hook(transport, remote_refs))
1166                                 return -1;
1167
1168                 if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
1169                         struct ref *ref = remote_refs;
1170                         for (; ref; ref = ref->next)
1171                                 if (!is_null_sha1(ref->new_sha1) &&
1172                                     !push_unpushed_submodules(ref->new_sha1,
1173                                             transport->remote->name))
1174                                     die ("Failed to push all needed submodules!");
1175                 }
1176
1177                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1178                               TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
1179                         struct ref *ref = remote_refs;
1180                         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1181
1182                         for (; ref; ref = ref->next)
1183                                 if (!is_null_sha1(ref->new_sha1) &&
1184                                     find_unpushed_submodules(ref->new_sha1,
1185                                             transport->remote->name, &needs_pushing))
1186                                         die_with_unpushed_submodules(&needs_pushing);
1187                 }
1188
1189                 push_ret = transport->push_refs(transport, remote_refs, flags);
1190                 err = push_had_errors(remote_refs);
1191                 ret = push_ret | err;
1192
1193                 if (!quiet || err)
1194                         transport_print_push_status(transport->url, remote_refs,
1195                                         verbose | porcelain, porcelain,
1196                                         reject_reasons);
1197
1198                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1199                         set_upstreams(transport, remote_refs, pretend);
1200
1201                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1202                         struct ref *ref;
1203                         for (ref = remote_refs; ref; ref = ref->next)
1204                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1205                 }
1206
1207                 if (porcelain && !push_ret)
1208                         puts("Done");
1209                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1210                         fprintf(stderr, "Everything up-to-date\n");
1211
1212                 return ret;
1213         }
1214         return 1;
1215 }
1216
1217 const struct ref *transport_get_remote_refs(struct transport *transport)
1218 {
1219         if (!transport->got_remote_refs) {
1220                 transport->remote_refs = transport->get_refs_list(transport, 0);
1221                 transport->got_remote_refs = 1;
1222         }
1223
1224         return transport->remote_refs;
1225 }
1226
1227 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1228 {
1229         int rc;
1230         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1231         struct ref **heads = NULL;
1232         struct ref *rm;
1233
1234         for (rm = refs; rm; rm = rm->next) {
1235                 nr_refs++;
1236                 if (rm->peer_ref &&
1237                     !is_null_sha1(rm->old_sha1) &&
1238                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1239                         continue;
1240                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1241                 heads[nr_heads++] = rm;
1242         }
1243
1244         if (!nr_heads) {
1245                 /*
1246                  * When deepening of a shallow repository is requested,
1247                  * then local and remote refs are likely to still be equal.
1248                  * Just feed them all to the fetch method in that case.
1249                  * This condition shouldn't be met in a non-deepening fetch
1250                  * (see builtin/fetch.c:quickfetch()).
1251                  */
1252                 heads = xmalloc(nr_refs * sizeof(*heads));
1253                 for (rm = refs; rm; rm = rm->next)
1254                         heads[nr_heads++] = rm;
1255         }
1256
1257         rc = transport->fetch(transport, nr_heads, heads);
1258
1259         free(heads);
1260         return rc;
1261 }
1262
1263 void transport_unlock_pack(struct transport *transport)
1264 {
1265         if (transport->pack_lockfile) {
1266                 unlink_or_warn(transport->pack_lockfile);
1267                 free(transport->pack_lockfile);
1268                 transport->pack_lockfile = NULL;
1269         }
1270 }
1271
1272 int transport_connect(struct transport *transport, const char *name,
1273                       const char *exec, int fd[2])
1274 {
1275         if (transport->connect)
1276                 return transport->connect(transport, name, exec, fd);
1277         else
1278                 die("Operation not supported by protocol");
1279 }
1280
1281 int transport_disconnect(struct transport *transport)
1282 {
1283         int ret = 0;
1284         if (transport->disconnect)
1285                 ret = transport->disconnect(transport);
1286         free(transport);
1287         return ret;
1288 }
1289
1290 /*
1291  * Strip username (and password) from a URL and return
1292  * it in a newly allocated string.
1293  */
1294 char *transport_anonymize_url(const char *url)
1295 {
1296         char *anon_url, *scheme_prefix, *anon_part;
1297         size_t anon_len, prefix_len = 0;
1298
1299         anon_part = strchr(url, '@');
1300         if (url_is_local_not_ssh(url) || !anon_part)
1301                 goto literal_copy;
1302
1303         anon_len = strlen(++anon_part);
1304         scheme_prefix = strstr(url, "://");
1305         if (!scheme_prefix) {
1306                 if (!strchr(anon_part, ':'))
1307                         /* cannot be "me@there:/path/name" */
1308                         goto literal_copy;
1309         } else {
1310                 const char *cp;
1311                 /* make sure scheme is reasonable */
1312                 for (cp = url; cp < scheme_prefix; cp++) {
1313                         switch (*cp) {
1314                                 /* RFC 1738 2.1 */
1315                         case '+': case '.': case '-':
1316                                 break; /* ok */
1317                         default:
1318                                 if (isalnum(*cp))
1319                                         break;
1320                                 /* it isn't */
1321                                 goto literal_copy;
1322                         }
1323                 }
1324                 /* @ past the first slash does not count */
1325                 cp = strchr(scheme_prefix + 3, '/');
1326                 if (cp && cp < anon_part)
1327                         goto literal_copy;
1328                 prefix_len = scheme_prefix - url + 3;
1329         }
1330         anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1331         memcpy(anon_url, url, prefix_len);
1332         memcpy(anon_url + prefix_len, anon_part, anon_len);
1333         return anon_url;
1334 literal_copy:
1335         return xstrdup(url);
1336 }
1337
1338 struct alternate_refs_data {
1339         alternate_ref_fn *fn;
1340         void *data;
1341 };
1342
1343 static int refs_from_alternate_cb(struct alternate_object_database *e,
1344                                   void *data)
1345 {
1346         char *other;
1347         size_t len;
1348         struct remote *remote;
1349         struct transport *transport;
1350         const struct ref *extra;
1351         struct alternate_refs_data *cb = data;
1352
1353         e->name[-1] = '\0';
1354         other = xstrdup(real_path(e->base));
1355         e->name[-1] = '/';
1356         len = strlen(other);
1357
1358         while (other[len-1] == '/')
1359                 other[--len] = '\0';
1360         if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1361                 goto out;
1362         /* Is this a git repository with refs? */
1363         memcpy(other + len - 8, "/refs", 6);
1364         if (!is_directory(other))
1365                 goto out;
1366         other[len - 8] = '\0';
1367         remote = remote_get(other);
1368         transport = transport_get(remote, other);
1369         for (extra = transport_get_remote_refs(transport);
1370              extra;
1371              extra = extra->next)
1372                 cb->fn(extra, cb->data);
1373         transport_disconnect(transport);
1374 out:
1375         free(other);
1376         return 0;
1377 }
1378
1379 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1380 {
1381         struct alternate_refs_data cb;
1382         cb.fn = fn;
1383         cb.data = data;
1384         foreach_alt_odb(refs_from_alternate_cb, &cb);
1385 }