Sync with maint
[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         char **heads = xmalloc(nr_heads * sizeof(*heads));
522         char **origh = xmalloc(nr_heads * sizeof(*origh));
523         const struct ref *refs;
524         char *dest = xstrdup(transport->url);
525         struct fetch_pack_args args;
526         int i;
527         struct ref *refs_tmp = NULL;
528
529         memset(&args, 0, sizeof(args));
530         args.uploadpack = data->options.uploadpack;
531         args.keep_pack = data->options.keep;
532         args.lock_pack = 1;
533         args.use_thin_pack = data->options.thin;
534         args.include_tag = data->options.followtags;
535         args.verbose = (transport->verbose > 1);
536         args.quiet = (transport->verbose < 0);
537         args.no_progress = !transport->progress;
538         args.depth = data->options.depth;
539
540         for (i = 0; i < nr_heads; i++)
541                 origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
542
543         if (!data->got_remote_heads) {
544                 connect_setup(transport, 0, 0);
545                 get_remote_heads(data->fd[0], &refs_tmp, 0, NULL);
546                 data->got_remote_heads = 1;
547         }
548
549         refs = fetch_pack(&args, data->fd, data->conn,
550                           refs_tmp ? refs_tmp : transport->remote_refs,
551                           dest, nr_heads, heads, &transport->pack_lockfile);
552         close(data->fd[0]);
553         close(data->fd[1]);
554         if (finish_connect(data->conn))
555                 refs = NULL;
556         data->conn = NULL;
557         data->got_remote_heads = 0;
558
559         free_refs(refs_tmp);
560
561         for (i = 0; i < nr_heads; i++)
562                 free(origh[i]);
563         free(origh);
564         free(heads);
565         free(dest);
566         return (refs ? 0 : -1);
567 }
568
569 static int push_had_errors(struct ref *ref)
570 {
571         for (; ref; ref = ref->next) {
572                 switch (ref->status) {
573                 case REF_STATUS_NONE:
574                 case REF_STATUS_UPTODATE:
575                 case REF_STATUS_OK:
576                         break;
577                 default:
578                         return 1;
579                 }
580         }
581         return 0;
582 }
583
584 int transport_refs_pushed(struct ref *ref)
585 {
586         for (; ref; ref = ref->next) {
587                 switch(ref->status) {
588                 case REF_STATUS_NONE:
589                 case REF_STATUS_UPTODATE:
590                         break;
591                 default:
592                         return 1;
593                 }
594         }
595         return 0;
596 }
597
598 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
599 {
600         struct refspec rs;
601
602         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
603                 return;
604
605         rs.src = ref->name;
606         rs.dst = NULL;
607
608         if (!remote_find_tracking(remote, &rs)) {
609                 if (verbose)
610                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
611                 if (ref->deletion) {
612                         delete_ref(rs.dst, NULL, 0);
613                 } else
614                         update_ref("update by push", rs.dst,
615                                         ref->new_sha1, NULL, 0, 0);
616                 free(rs.dst);
617         }
618 }
619
620 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
621 {
622         if (porcelain) {
623                 if (from)
624                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
625                 else
626                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
627                 if (msg)
628                         fprintf(stdout, "%s (%s)\n", summary, msg);
629                 else
630                         fprintf(stdout, "%s\n", summary);
631         } else {
632                 fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
633                 if (from)
634                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
635                 else
636                         fputs(prettify_refname(to->name), stderr);
637                 if (msg) {
638                         fputs(" (", stderr);
639                         fputs(msg, stderr);
640                         fputc(')', stderr);
641                 }
642                 fputc('\n', stderr);
643         }
644 }
645
646 static const char *status_abbrev(unsigned char sha1[20])
647 {
648         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
649 }
650
651 static void print_ok_ref_status(struct ref *ref, int porcelain)
652 {
653         if (ref->deletion)
654                 print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
655         else if (is_null_sha1(ref->old_sha1))
656                 print_ref_status('*',
657                         (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
658                         "[new branch]"),
659                         ref, ref->peer_ref, NULL, porcelain);
660         else {
661                 char quickref[84];
662                 char type;
663                 const char *msg;
664
665                 strcpy(quickref, status_abbrev(ref->old_sha1));
666                 if (ref->nonfastforward) {
667                         strcat(quickref, "...");
668                         type = '+';
669                         msg = "forced update";
670                 } else {
671                         strcat(quickref, "..");
672                         type = ' ';
673                         msg = NULL;
674                 }
675                 strcat(quickref, status_abbrev(ref->new_sha1));
676
677                 print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
678         }
679 }
680
681 static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
682 {
683         if (!count)
684                 fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
685
686         switch(ref->status) {
687         case REF_STATUS_NONE:
688                 print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
689                 break;
690         case REF_STATUS_REJECT_NODELETE:
691                 print_ref_status('!', "[rejected]", ref, NULL,
692                                                  "remote does not support deleting refs", porcelain);
693                 break;
694         case REF_STATUS_UPTODATE:
695                 print_ref_status('=', "[up to date]", ref,
696                                                  ref->peer_ref, NULL, porcelain);
697                 break;
698         case REF_STATUS_REJECT_NONFASTFORWARD:
699                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
700                                                  "non-fast-forward", 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, int *nonfastforward)
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         *nonfastforward = 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                     *nonfastforward != NON_FF_HEAD) {
748                         if (!strcmp(head, ref->name))
749                                 *nonfastforward = NON_FF_HEAD;
750                         else
751                                 *nonfastforward = NON_FF_OTHER;
752                 }
753         }
754 }
755
756 void transport_verify_remote_names(int nr_heads, const char **heads)
757 {
758         int i;
759
760         for (i = 0; i < nr_heads; i++) {
761                 const char *local = heads[i];
762                 const char *remote = strrchr(heads[i], ':');
763
764                 if (*local == '+')
765                         local++;
766
767                 /* A matching refspec is okay.  */
768                 if (remote == local && remote[1] == '\0')
769                         continue;
770
771                 remote = remote ? (remote + 1) : local;
772                 if (check_refname_format(remote,
773                                 REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
774                         die("remote part of refspec is not a valid name in %s",
775                                 heads[i]);
776         }
777 }
778
779 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
780 {
781         struct git_transport_data *data = transport->data;
782         struct send_pack_args args;
783         int ret;
784
785         if (!data->got_remote_heads) {
786                 struct ref *tmp_refs;
787                 connect_setup(transport, 1, 0);
788
789                 get_remote_heads(data->fd[0], &tmp_refs, REF_NORMAL, NULL);
790                 data->got_remote_heads = 1;
791         }
792
793         memset(&args, 0, sizeof(args));
794         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
795         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
796         args.use_thin_pack = data->options.thin;
797         args.verbose = (transport->verbose > 0);
798         args.quiet = (transport->verbose < 0);
799         args.progress = transport->progress;
800         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
801         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
802
803         ret = send_pack(&args, data->fd, data->conn, remote_refs,
804                         &data->extra_have);
805
806         close(data->fd[1]);
807         close(data->fd[0]);
808         ret |= finish_connect(data->conn);
809         data->conn = NULL;
810         data->got_remote_heads = 0;
811
812         return ret;
813 }
814
815 static int connect_git(struct transport *transport, const char *name,
816                        const char *executable, int fd[2])
817 {
818         struct git_transport_data *data = transport->data;
819         data->conn = git_connect(data->fd, transport->url,
820                                  executable, 0);
821         fd[0] = data->fd[0];
822         fd[1] = data->fd[1];
823         return 0;
824 }
825
826 static int disconnect_git(struct transport *transport)
827 {
828         struct git_transport_data *data = transport->data;
829         if (data->conn) {
830                 if (data->got_remote_heads)
831                         packet_flush(data->fd[1]);
832                 close(data->fd[0]);
833                 close(data->fd[1]);
834                 finish_connect(data->conn);
835         }
836
837         free(data);
838         return 0;
839 }
840
841 void transport_take_over(struct transport *transport,
842                          struct child_process *child)
843 {
844         struct git_transport_data *data;
845
846         if (!transport->smart_options)
847                 die("Bug detected: Taking over transport requires non-NULL "
848                     "smart_options field.");
849
850         data = xcalloc(1, sizeof(*data));
851         data->options = *transport->smart_options;
852         data->conn = child;
853         data->fd[0] = data->conn->out;
854         data->fd[1] = data->conn->in;
855         data->got_remote_heads = 0;
856         transport->data = data;
857
858         transport->set_option = NULL;
859         transport->get_refs_list = get_refs_via_connect;
860         transport->fetch = fetch_refs_via_pack;
861         transport->push = NULL;
862         transport->push_refs = git_transport_push;
863         transport->disconnect = disconnect_git;
864         transport->smart_options = &(data->options);
865 }
866
867 static int is_local(const char *url)
868 {
869         const char *colon = strchr(url, ':');
870         const char *slash = strchr(url, '/');
871         return !colon || (slash && slash < colon) ||
872                 has_dos_drive_prefix(url);
873 }
874
875 static int is_file(const char *url)
876 {
877         struct stat buf;
878         if (stat(url, &buf))
879                 return 0;
880         return S_ISREG(buf.st_mode);
881 }
882
883 static int external_specification_len(const char *url)
884 {
885         return strchr(url, ':') - url;
886 }
887
888 struct transport *transport_get(struct remote *remote, const char *url)
889 {
890         const char *helper;
891         struct transport *ret = xcalloc(1, sizeof(*ret));
892
893         ret->progress = isatty(2);
894
895         if (!remote)
896                 die("No remote provided to transport_get()");
897
898         ret->got_remote_refs = 0;
899         ret->remote = remote;
900         helper = remote->foreign_vcs;
901
902         if (!url && remote->url)
903                 url = remote->url[0];
904         ret->url = url;
905
906         /* maybe it is a foreign URL? */
907         if (url) {
908                 const char *p = url;
909
910                 while (is_urlschemechar(p == url, *p))
911                         p++;
912                 if (!prefixcmp(p, "::"))
913                         helper = xstrndup(url, p - url);
914         }
915
916         if (helper) {
917                 transport_helper_init(ret, helper);
918         } else if (!prefixcmp(url, "rsync:")) {
919                 ret->get_refs_list = get_refs_via_rsync;
920                 ret->fetch = fetch_objs_via_rsync;
921                 ret->push = rsync_transport_push;
922                 ret->smart_options = NULL;
923         } else if (is_local(url) && is_file(url) && is_bundle(url, 1)) {
924                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
925                 ret->data = data;
926                 ret->get_refs_list = get_refs_from_bundle;
927                 ret->fetch = fetch_refs_from_bundle;
928                 ret->disconnect = close_bundle;
929                 ret->smart_options = NULL;
930         } else if (!is_url(url)
931                 || !prefixcmp(url, "file://")
932                 || !prefixcmp(url, "git://")
933                 || !prefixcmp(url, "ssh://")
934                 || !prefixcmp(url, "git+ssh://")
935                 || !prefixcmp(url, "ssh+git://")) {
936                 /* These are builtin smart transports. */
937                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
938                 ret->data = data;
939                 ret->set_option = NULL;
940                 ret->get_refs_list = get_refs_via_connect;
941                 ret->fetch = fetch_refs_via_pack;
942                 ret->push_refs = git_transport_push;
943                 ret->connect = connect_git;
944                 ret->disconnect = disconnect_git;
945                 ret->smart_options = &(data->options);
946
947                 data->conn = NULL;
948                 data->got_remote_heads = 0;
949         } else {
950                 /* Unknown protocol in URL. Pass to external handler. */
951                 int len = external_specification_len(url);
952                 char *handler = xmalloc(len + 1);
953                 handler[len] = 0;
954                 strncpy(handler, url, len);
955                 transport_helper_init(ret, handler);
956         }
957
958         if (ret->smart_options) {
959                 ret->smart_options->thin = 1;
960                 ret->smart_options->uploadpack = "git-upload-pack";
961                 if (remote->uploadpack)
962                         ret->smart_options->uploadpack = remote->uploadpack;
963                 ret->smart_options->receivepack = "git-receive-pack";
964                 if (remote->receivepack)
965                         ret->smart_options->receivepack = remote->receivepack;
966         }
967
968         return ret;
969 }
970
971 int transport_set_option(struct transport *transport,
972                          const char *name, const char *value)
973 {
974         int git_reports = 1, protocol_reports = 1;
975
976         if (transport->smart_options)
977                 git_reports = set_git_option(transport->smart_options,
978                                              name, value);
979
980         if (transport->set_option)
981                 protocol_reports = transport->set_option(transport, name,
982                                                         value);
983
984         /* If either report is 0, report 0 (success). */
985         if (!git_reports || !protocol_reports)
986                 return 0;
987         /* If either reports -1 (invalid value), report -1. */
988         if ((git_reports == -1) || (protocol_reports == -1))
989                 return -1;
990         /* Otherwise if both report unknown, report unknown. */
991         return 1;
992 }
993
994 void transport_set_verbosity(struct transport *transport, int verbosity,
995         int force_progress)
996 {
997         if (verbosity >= 1)
998                 transport->verbose = verbosity <= 3 ? verbosity : 3;
999         if (verbosity < 0)
1000                 transport->verbose = -1;
1001
1002         /**
1003          * Rules used to determine whether to report progress (processing aborts
1004          * when a rule is satisfied):
1005          *
1006          *   . Report progress, if force_progress is 1 (ie. --progress).
1007          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
1008          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1009          *   . Report progress if isatty(2) is 1.
1010          **/
1011         if (force_progress >= 0)
1012                 transport->progress = !!force_progress;
1013         else
1014                 transport->progress = verbosity >= 0 && isatty(2);
1015 }
1016
1017 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1018 {
1019         int i;
1020
1021         fprintf(stderr, "The following submodule paths contain changes that can\n"
1022                         "not be found on any remote:\n");
1023         for (i = 0; i < needs_pushing->nr; i++)
1024                 printf("  %s\n", needs_pushing->items[i].string);
1025         fprintf(stderr, "\nPlease try\n\n"
1026                         "       git push --recurse-submodules=on-demand\n\n"
1027                         "or cd to the path and use\n\n"
1028                         "       git push\n\n"
1029                         "to push them to a remote.\n\n");
1030
1031         string_list_clear(needs_pushing, 0);
1032
1033         die("Aborting.");
1034 }
1035
1036 int transport_push(struct transport *transport,
1037                    int refspec_nr, const char **refspec, int flags,
1038                    int *nonfastforward)
1039 {
1040         *nonfastforward = 0;
1041         transport_verify_remote_names(refspec_nr, refspec);
1042
1043         if (transport->push) {
1044                 /* Maybe FIXME. But no important transport uses this case. */
1045                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1046                         die("This transport does not support using --set-upstream");
1047
1048                 return transport->push(transport, refspec_nr, refspec, flags);
1049         } else if (transport->push_refs) {
1050                 struct ref *remote_refs =
1051                         transport->get_refs_list(transport, 1);
1052                 struct ref *local_refs = get_local_heads();
1053                 int match_flags = MATCH_REFS_NONE;
1054                 int verbose = (transport->verbose > 0);
1055                 int quiet = (transport->verbose < 0);
1056                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1057                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1058                 int push_ret, ret, err;
1059
1060                 if (flags & TRANSPORT_PUSH_ALL)
1061                         match_flags |= MATCH_REFS_ALL;
1062                 if (flags & TRANSPORT_PUSH_MIRROR)
1063                         match_flags |= MATCH_REFS_MIRROR;
1064                 if (flags & TRANSPORT_PUSH_PRUNE)
1065                         match_flags |= MATCH_REFS_PRUNE;
1066
1067                 if (match_push_refs(local_refs, &remote_refs,
1068                                     refspec_nr, refspec, match_flags)) {
1069                         return -1;
1070                 }
1071
1072                 set_ref_status_for_push(remote_refs,
1073                         flags & TRANSPORT_PUSH_MIRROR,
1074                         flags & TRANSPORT_PUSH_FORCE);
1075
1076                 if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
1077                         struct ref *ref = remote_refs;
1078                         for (; ref; ref = ref->next)
1079                                 if (!is_null_sha1(ref->new_sha1) &&
1080                                     !push_unpushed_submodules(ref->new_sha1,
1081                                             transport->remote->name))
1082                                     die ("Failed to push all needed submodules!");
1083                 }
1084
1085                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1086                               TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
1087                         struct ref *ref = remote_refs;
1088                         struct string_list needs_pushing;
1089
1090                         memset(&needs_pushing, 0, sizeof(struct string_list));
1091                         needs_pushing.strdup_strings = 1;
1092                         for (; ref; ref = ref->next)
1093                                 if (!is_null_sha1(ref->new_sha1) &&
1094                                     find_unpushed_submodules(ref->new_sha1,
1095                                             transport->remote->name, &needs_pushing))
1096                                         die_with_unpushed_submodules(&needs_pushing);
1097                 }
1098
1099                 push_ret = transport->push_refs(transport, remote_refs, flags);
1100                 err = push_had_errors(remote_refs);
1101                 ret = push_ret | err;
1102
1103                 if (!quiet || err)
1104                         transport_print_push_status(transport->url, remote_refs,
1105                                         verbose | porcelain, porcelain,
1106                                         nonfastforward);
1107
1108                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1109                         set_upstreams(transport, remote_refs, pretend);
1110
1111                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1112                         struct ref *ref;
1113                         for (ref = remote_refs; ref; ref = ref->next)
1114                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1115                 }
1116
1117                 if (porcelain && !push_ret)
1118                         puts("Done");
1119                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1120                         fprintf(stderr, "Everything up-to-date\n");
1121
1122                 return ret;
1123         }
1124         return 1;
1125 }
1126
1127 const struct ref *transport_get_remote_refs(struct transport *transport)
1128 {
1129         if (!transport->got_remote_refs) {
1130                 transport->remote_refs = transport->get_refs_list(transport, 0);
1131                 transport->got_remote_refs = 1;
1132         }
1133
1134         return transport->remote_refs;
1135 }
1136
1137 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1138 {
1139         int rc;
1140         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1141         struct ref **heads = NULL;
1142         struct ref *rm;
1143
1144         for (rm = refs; rm; rm = rm->next) {
1145                 nr_refs++;
1146                 if (rm->peer_ref &&
1147                     !is_null_sha1(rm->old_sha1) &&
1148                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1149                         continue;
1150                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1151                 heads[nr_heads++] = rm;
1152         }
1153
1154         if (!nr_heads) {
1155                 /*
1156                  * When deepening of a shallow repository is requested,
1157                  * then local and remote refs are likely to still be equal.
1158                  * Just feed them all to the fetch method in that case.
1159                  * This condition shouldn't be met in a non-deepening fetch
1160                  * (see builtin-fetch.c:quickfetch()).
1161                  */
1162                 heads = xmalloc(nr_refs * sizeof(*heads));
1163                 for (rm = refs; rm; rm = rm->next)
1164                         heads[nr_heads++] = rm;
1165         }
1166
1167         rc = transport->fetch(transport, nr_heads, heads);
1168
1169         free(heads);
1170         return rc;
1171 }
1172
1173 void transport_unlock_pack(struct transport *transport)
1174 {
1175         if (transport->pack_lockfile) {
1176                 unlink_or_warn(transport->pack_lockfile);
1177                 free(transport->pack_lockfile);
1178                 transport->pack_lockfile = NULL;
1179         }
1180 }
1181
1182 int transport_connect(struct transport *transport, const char *name,
1183                       const char *exec, int fd[2])
1184 {
1185         if (transport->connect)
1186                 return transport->connect(transport, name, exec, fd);
1187         else
1188                 die("Operation not supported by protocol");
1189 }
1190
1191 int transport_disconnect(struct transport *transport)
1192 {
1193         int ret = 0;
1194         if (transport->disconnect)
1195                 ret = transport->disconnect(transport);
1196         free(transport);
1197         return ret;
1198 }
1199
1200 /*
1201  * Strip username (and password) from a URL and return
1202  * it in a newly allocated string.
1203  */
1204 char *transport_anonymize_url(const char *url)
1205 {
1206         char *anon_url, *scheme_prefix, *anon_part;
1207         size_t anon_len, prefix_len = 0;
1208
1209         anon_part = strchr(url, '@');
1210         if (is_local(url) || !anon_part)
1211                 goto literal_copy;
1212
1213         anon_len = strlen(++anon_part);
1214         scheme_prefix = strstr(url, "://");
1215         if (!scheme_prefix) {
1216                 if (!strchr(anon_part, ':'))
1217                         /* cannot be "me@there:/path/name" */
1218                         goto literal_copy;
1219         } else {
1220                 const char *cp;
1221                 /* make sure scheme is reasonable */
1222                 for (cp = url; cp < scheme_prefix; cp++) {
1223                         switch (*cp) {
1224                                 /* RFC 1738 2.1 */
1225                         case '+': case '.': case '-':
1226                                 break; /* ok */
1227                         default:
1228                                 if (isalnum(*cp))
1229                                         break;
1230                                 /* it isn't */
1231                                 goto literal_copy;
1232                         }
1233                 }
1234                 /* @ past the first slash does not count */
1235                 cp = strchr(scheme_prefix + 3, '/');
1236                 if (cp && cp < anon_part)
1237                         goto literal_copy;
1238                 prefix_len = scheme_prefix - url + 3;
1239         }
1240         anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1241         memcpy(anon_url, url, prefix_len);
1242         memcpy(anon_url + prefix_len, anon_part, anon_len);
1243         return anon_url;
1244 literal_copy:
1245         return xstrdup(url);
1246 }
1247
1248 struct alternate_refs_data {
1249         alternate_ref_fn *fn;
1250         void *data;
1251 };
1252
1253 static int refs_from_alternate_cb(struct alternate_object_database *e,
1254                                   void *data)
1255 {
1256         char *other;
1257         size_t len;
1258         struct remote *remote;
1259         struct transport *transport;
1260         const struct ref *extra;
1261         struct alternate_refs_data *cb = data;
1262
1263         e->name[-1] = '\0';
1264         other = xstrdup(real_path(e->base));
1265         e->name[-1] = '/';
1266         len = strlen(other);
1267
1268         while (other[len-1] == '/')
1269                 other[--len] = '\0';
1270         if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1271                 return 0;
1272         /* Is this a git repository with refs? */
1273         memcpy(other + len - 8, "/refs", 6);
1274         if (!is_directory(other))
1275                 return 0;
1276         other[len - 8] = '\0';
1277         remote = remote_get(other);
1278         transport = transport_get(remote, other);
1279         for (extra = transport_get_remote_refs(transport);
1280              extra;
1281              extra = extra->next)
1282                 cb->fn(extra, cb->data);
1283         transport_disconnect(transport);
1284         free(other);
1285         return 0;
1286 }
1287
1288 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1289 {
1290         struct alternate_refs_data cb;
1291         cb.fn = fn;
1292         cb.data = data;
1293         foreach_alt_odb(refs_from_alternate_cb, &cb);
1294 }