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