rebase -i: Document how temporary files are used
[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
12 /* rsync support */
13
14 /*
15  * We copy packed-refs and refs/ into a temporary file, then read the
16  * loose refs recursively (sorting whenever possible), and then inserting
17  * those packed refs that are not yet in the list (not validating, but
18  * assuming that the file is sorted).
19  *
20  * Appears refactoring this from refs.c is too cumbersome.
21  */
22
23 static int str_cmp(const void *a, const void *b)
24 {
25         const char *s1 = a;
26         const char *s2 = b;
27
28         return strcmp(s1, s2);
29 }
30
31 /* path->buf + name_offset is expected to point to "refs/" */
32
33 static int read_loose_refs(struct strbuf *path, int name_offset,
34                 struct ref **tail)
35 {
36         DIR *dir = opendir(path->buf);
37         struct dirent *de;
38         struct {
39                 char **entries;
40                 int nr, alloc;
41         } list;
42         int i, pathlen;
43
44         if (!dir)
45                 return -1;
46
47         memset (&list, 0, sizeof(list));
48
49         while ((de = readdir(dir))) {
50                 if (is_dot_or_dotdot(de->d_name))
51                         continue;
52                 ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
53                 list.entries[list.nr++] = xstrdup(de->d_name);
54         }
55         closedir(dir);
56
57         /* sort the list */
58
59         qsort(list.entries, list.nr, sizeof(char *), str_cmp);
60
61         pathlen = path->len;
62         strbuf_addch(path, '/');
63
64         for (i = 0; i < list.nr; i++, strbuf_setlen(path, pathlen + 1)) {
65                 strbuf_addstr(path, list.entries[i]);
66                 if (read_loose_refs(path, name_offset, tail)) {
67                         int fd = open(path->buf, O_RDONLY);
68                         char buffer[40];
69                         struct ref *next;
70
71                         if (fd < 0)
72                                 continue;
73                         next = alloc_ref(path->buf + name_offset);
74                         if (read_in_full(fd, buffer, 40) != 40 ||
75                                         get_sha1_hex(buffer, next->old_sha1)) {
76                                 close(fd);
77                                 free(next);
78                                 continue;
79                         }
80                         close(fd);
81                         (*tail)->next = next;
82                         *tail = next;
83                 }
84         }
85         strbuf_setlen(path, pathlen);
86
87         for (i = 0; i < list.nr; i++)
88                 free(list.entries[i]);
89         free(list.entries);
90
91         return 0;
92 }
93
94 /* insert the packed refs for which no loose refs were found */
95
96 static void insert_packed_refs(const char *packed_refs, struct ref **list)
97 {
98         FILE *f = fopen(packed_refs, "r");
99         static char buffer[PATH_MAX];
100
101         if (!f)
102                 return;
103
104         for (;;) {
105                 int cmp = cmp, len;
106
107                 if (!fgets(buffer, sizeof(buffer), f)) {
108                         fclose(f);
109                         return;
110                 }
111
112                 if (hexval(buffer[0]) > 0xf)
113                         continue;
114                 len = strlen(buffer);
115                 if (len && buffer[len - 1] == '\n')
116                         buffer[--len] = '\0';
117                 if (len < 41)
118                         continue;
119                 while ((*list)->next &&
120                                 (cmp = strcmp(buffer + 41,
121                                       (*list)->next->name)) > 0)
122                         list = &(*list)->next;
123                 if (!(*list)->next || cmp < 0) {
124                         struct ref *next = alloc_ref(buffer + 41);
125                         buffer[40] = '\0';
126                         if (get_sha1_hex(buffer, next->old_sha1)) {
127                                 warning ("invalid SHA-1: %s", buffer);
128                                 free(next);
129                                 continue;
130                         }
131                         next->next = (*list)->next;
132                         (*list)->next = next;
133                         list = &(*list)->next;
134                 }
135         }
136 }
137
138 static const char *rsync_url(const char *url)
139 {
140         return prefixcmp(url, "rsync://") ? skip_prefix(url, "rsync:") : url;
141 }
142
143 static struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
144 {
145         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
146         struct ref dummy, *tail = &dummy;
147         struct child_process rsync;
148         const char *args[5];
149         int temp_dir_len;
150
151         if (for_push)
152                 return NULL;
153
154         /* copy the refs to the temporary directory */
155
156         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
157         if (!mkdtemp(temp_dir.buf))
158                 die_errno ("Could not make temporary directory");
159         temp_dir_len = temp_dir.len;
160
161         strbuf_addstr(&buf, rsync_url(transport->url));
162         strbuf_addstr(&buf, "/refs");
163
164         memset(&rsync, 0, sizeof(rsync));
165         rsync.argv = args;
166         rsync.stdout_to_stderr = 1;
167         args[0] = "rsync";
168         args[1] = (transport->verbose > 0) ? "-rv" : "-r";
169         args[2] = buf.buf;
170         args[3] = temp_dir.buf;
171         args[4] = NULL;
172
173         if (run_command(&rsync))
174                 die ("Could not run rsync to get refs");
175
176         strbuf_reset(&buf);
177         strbuf_addstr(&buf, rsync_url(transport->url));
178         strbuf_addstr(&buf, "/packed-refs");
179
180         args[2] = buf.buf;
181
182         if (run_command(&rsync))
183                 die ("Could not run rsync to get refs");
184
185         /* read the copied refs */
186
187         strbuf_addstr(&temp_dir, "/refs");
188         read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
189         strbuf_setlen(&temp_dir, temp_dir_len);
190
191         tail = &dummy;
192         strbuf_addstr(&temp_dir, "/packed-refs");
193         insert_packed_refs(temp_dir.buf, &tail);
194         strbuf_setlen(&temp_dir, temp_dir_len);
195
196         if (remove_dir_recursively(&temp_dir, 0))
197                 warning ("Error removing temporary directory %s.",
198                                 temp_dir.buf);
199
200         strbuf_release(&buf);
201         strbuf_release(&temp_dir);
202
203         return dummy.next;
204 }
205
206 static int fetch_objs_via_rsync(struct transport *transport,
207                                 int nr_objs, const struct ref **to_fetch)
208 {
209         struct strbuf buf = STRBUF_INIT;
210         struct child_process rsync;
211         const char *args[8];
212         int result;
213
214         strbuf_addstr(&buf, rsync_url(transport->url));
215         strbuf_addstr(&buf, "/objects/");
216
217         memset(&rsync, 0, sizeof(rsync));
218         rsync.argv = args;
219         rsync.stdout_to_stderr = 1;
220         args[0] = "rsync";
221         args[1] = (transport->verbose > 0) ? "-rv" : "-r";
222         args[2] = "--ignore-existing";
223         args[3] = "--exclude";
224         args[4] = "info";
225         args[5] = buf.buf;
226         args[6] = get_object_directory();
227         args[7] = NULL;
228
229         /* NEEDSWORK: handle one level of alternates */
230         result = run_command(&rsync);
231
232         strbuf_release(&buf);
233
234         return result;
235 }
236
237 static int write_one_ref(const char *name, const unsigned char *sha1,
238                 int flags, void *data)
239 {
240         struct strbuf *buf = data;
241         int len = buf->len;
242         FILE *f;
243
244         /* when called via for_each_ref(), flags is non-zero */
245         if (flags && prefixcmp(name, "refs/heads/") &&
246                         prefixcmp(name, "refs/tags/"))
247                 return 0;
248
249         strbuf_addstr(buf, name);
250         if (safe_create_leading_directories(buf->buf) ||
251                         !(f = fopen(buf->buf, "w")) ||
252                         fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
253                         fclose(f))
254                 return error("problems writing temporary file %s", buf->buf);
255         strbuf_setlen(buf, len);
256         return 0;
257 }
258
259 static int write_refs_to_temp_dir(struct strbuf *temp_dir,
260                 int refspec_nr, const char **refspec)
261 {
262         int i;
263
264         for (i = 0; i < refspec_nr; i++) {
265                 unsigned char sha1[20];
266                 char *ref;
267
268                 if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
269                         return error("Could not get ref %s", refspec[i]);
270
271                 if (write_one_ref(ref, sha1, 0, temp_dir)) {
272                         free(ref);
273                         return -1;
274                 }
275                 free(ref);
276         }
277         return 0;
278 }
279
280 static int rsync_transport_push(struct transport *transport,
281                 int refspec_nr, const char **refspec, int flags)
282 {
283         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
284         int result = 0, i;
285         struct child_process rsync;
286         const char *args[10];
287
288         if (flags & TRANSPORT_PUSH_MIRROR)
289                 return error("rsync transport does not support mirror mode");
290
291         /* first push the objects */
292
293         strbuf_addstr(&buf, rsync_url(transport->url));
294         strbuf_addch(&buf, '/');
295
296         memset(&rsync, 0, sizeof(rsync));
297         rsync.argv = args;
298         rsync.stdout_to_stderr = 1;
299         i = 0;
300         args[i++] = "rsync";
301         args[i++] = "-a";
302         if (flags & TRANSPORT_PUSH_DRY_RUN)
303                 args[i++] = "--dry-run";
304         if (transport->verbose > 0)
305                 args[i++] = "-v";
306         args[i++] = "--ignore-existing";
307         args[i++] = "--exclude";
308         args[i++] = "info";
309         args[i++] = get_object_directory();
310         args[i++] = buf.buf;
311         args[i++] = NULL;
312
313         if (run_command(&rsync))
314                 return error("Could not push objects to %s",
315                                 rsync_url(transport->url));
316
317         /* copy the refs to the temporary directory; they could be packed. */
318
319         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
320         if (!mkdtemp(temp_dir.buf))
321                 die_errno ("Could not make temporary directory");
322         strbuf_addch(&temp_dir, '/');
323
324         if (flags & TRANSPORT_PUSH_ALL) {
325                 if (for_each_ref(write_one_ref, &temp_dir))
326                         return -1;
327         } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
328                 return -1;
329
330         i = 2;
331         if (flags & TRANSPORT_PUSH_DRY_RUN)
332                 args[i++] = "--dry-run";
333         if (!(flags & TRANSPORT_PUSH_FORCE))
334                 args[i++] = "--ignore-existing";
335         args[i++] = temp_dir.buf;
336         args[i++] = rsync_url(transport->url);
337         args[i++] = NULL;
338         if (run_command(&rsync))
339                 result = error("Could not push to %s",
340                                 rsync_url(transport->url));
341
342         if (remove_dir_recursively(&temp_dir, 0))
343                 warning ("Could not remove temporary directory %s.",
344                                 temp_dir.buf);
345
346         strbuf_release(&buf);
347         strbuf_release(&temp_dir);
348
349         return result;
350 }
351
352 struct bundle_transport_data {
353         int fd;
354         struct bundle_header header;
355 };
356
357 static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
358 {
359         struct bundle_transport_data *data = transport->data;
360         struct ref *result = NULL;
361         int i;
362
363         if (for_push)
364                 return NULL;
365
366         if (data->fd > 0)
367                 close(data->fd);
368         data->fd = read_bundle_header(transport->url, &data->header);
369         if (data->fd < 0)
370                 die ("Could not read bundle '%s'.", transport->url);
371         for (i = 0; i < data->header.references.nr; i++) {
372                 struct ref_list_entry *e = data->header.references.list + i;
373                 struct ref *ref = alloc_ref(e->name);
374                 hashcpy(ref->old_sha1, e->sha1);
375                 ref->next = result;
376                 result = ref;
377         }
378         return result;
379 }
380
381 static int fetch_refs_from_bundle(struct transport *transport,
382                                int nr_heads, const struct ref **to_fetch)
383 {
384         struct bundle_transport_data *data = transport->data;
385         return unbundle(&data->header, data->fd);
386 }
387
388 static int close_bundle(struct transport *transport)
389 {
390         struct bundle_transport_data *data = transport->data;
391         if (data->fd > 0)
392                 close(data->fd);
393         free(data);
394         return 0;
395 }
396
397 struct git_transport_data {
398         unsigned thin : 1;
399         unsigned keep : 1;
400         unsigned followtags : 1;
401         int depth;
402         struct child_process *conn;
403         int fd[2];
404         const char *uploadpack;
405         const char *receivepack;
406         struct extra_have_objects extra_have;
407 };
408
409 static int set_git_option(struct transport *connection,
410                           const char *name, const char *value)
411 {
412         struct git_transport_data *data = connection->data;
413         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
414                 data->uploadpack = value;
415                 return 0;
416         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
417                 data->receivepack = value;
418                 return 0;
419         } else if (!strcmp(name, TRANS_OPT_THIN)) {
420                 data->thin = !!value;
421                 return 0;
422         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
423                 data->followtags = !!value;
424                 return 0;
425         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
426                 data->keep = !!value;
427                 return 0;
428         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
429                 if (!value)
430                         data->depth = 0;
431                 else
432                         data->depth = atoi(value);
433                 return 0;
434         }
435         return 1;
436 }
437
438 static int connect_setup(struct transport *transport, int for_push, int verbose)
439 {
440         struct git_transport_data *data = transport->data;
441         data->conn = git_connect(data->fd, transport->url,
442                                  for_push ? data->receivepack : data->uploadpack,
443                                  verbose ? CONNECT_VERBOSE : 0);
444         return 0;
445 }
446
447 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
448 {
449         struct git_transport_data *data = transport->data;
450         struct ref *refs;
451
452         connect_setup(transport, for_push, 0);
453         get_remote_heads(data->fd[0], &refs, 0, NULL,
454                          for_push ? REF_NORMAL : 0, &data->extra_have);
455
456         return refs;
457 }
458
459 static int fetch_refs_via_pack(struct transport *transport,
460                                int nr_heads, const struct ref **to_fetch)
461 {
462         struct git_transport_data *data = transport->data;
463         char **heads = xmalloc(nr_heads * sizeof(*heads));
464         char **origh = xmalloc(nr_heads * sizeof(*origh));
465         const struct ref *refs;
466         char *dest = xstrdup(transport->url);
467         struct fetch_pack_args args;
468         int i;
469         struct ref *refs_tmp = NULL;
470
471         memset(&args, 0, sizeof(args));
472         args.uploadpack = data->uploadpack;
473         args.keep_pack = data->keep;
474         args.lock_pack = 1;
475         args.use_thin_pack = data->thin;
476         args.include_tag = data->followtags;
477         args.verbose = (transport->verbose > 0);
478         args.quiet = (transport->verbose < 0);
479         args.no_progress = args.quiet || (!transport->progress && !isatty(1));
480         args.depth = data->depth;
481
482         for (i = 0; i < nr_heads; i++)
483                 origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
484
485         if (!data->conn) {
486                 connect_setup(transport, 0, 0);
487                 get_remote_heads(data->fd[0], &refs_tmp, 0, NULL, 0, NULL);
488         }
489
490         refs = fetch_pack(&args, data->fd, data->conn,
491                           refs_tmp ? refs_tmp : transport->remote_refs,
492                           dest, nr_heads, heads, &transport->pack_lockfile);
493         close(data->fd[0]);
494         close(data->fd[1]);
495         if (finish_connect(data->conn))
496                 refs = NULL;
497         data->conn = NULL;
498
499         free_refs(refs_tmp);
500
501         for (i = 0; i < nr_heads; i++)
502                 free(origh[i]);
503         free(origh);
504         free(heads);
505         free(dest);
506         return (refs ? 0 : -1);
507 }
508
509 static int push_had_errors(struct ref *ref)
510 {
511         for (; ref; ref = ref->next) {
512                 switch (ref->status) {
513                 case REF_STATUS_NONE:
514                 case REF_STATUS_UPTODATE:
515                 case REF_STATUS_OK:
516                         break;
517                 default:
518                         return 1;
519                 }
520         }
521         return 0;
522 }
523
524 static int refs_pushed(struct ref *ref)
525 {
526         for (; ref; ref = ref->next) {
527                 switch(ref->status) {
528                 case REF_STATUS_NONE:
529                 case REF_STATUS_UPTODATE:
530                         break;
531                 default:
532                         return 1;
533                 }
534         }
535         return 0;
536 }
537
538 static void update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
539 {
540         struct refspec rs;
541
542         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
543                 return;
544
545         rs.src = ref->name;
546         rs.dst = NULL;
547
548         if (!remote_find_tracking(remote, &rs)) {
549                 if (verbose)
550                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
551                 if (ref->deletion) {
552                         delete_ref(rs.dst, NULL, 0);
553                 } else
554                         update_ref("update by push", rs.dst,
555                                         ref->new_sha1, NULL, 0, 0);
556                 free(rs.dst);
557         }
558 }
559
560 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
561
562 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
563 {
564         if (porcelain) {
565                 if (from)
566                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
567                 else
568                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
569                 if (msg)
570                         fprintf(stdout, "%s (%s)\n", summary, msg);
571                 else
572                         fprintf(stdout, "%s\n", summary);
573         } else {
574                 fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary);
575                 if (from)
576                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
577                 else
578                         fputs(prettify_refname(to->name), stderr);
579                 if (msg) {
580                         fputs(" (", stderr);
581                         fputs(msg, stderr);
582                         fputc(')', stderr);
583                 }
584                 fputc('\n', stderr);
585         }
586 }
587
588 static const char *status_abbrev(unsigned char sha1[20])
589 {
590         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
591 }
592
593 static void print_ok_ref_status(struct ref *ref, int porcelain)
594 {
595         if (ref->deletion)
596                 print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
597         else if (is_null_sha1(ref->old_sha1))
598                 print_ref_status('*',
599                         (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
600                         "[new branch]"),
601                         ref, ref->peer_ref, NULL, porcelain);
602         else {
603                 char quickref[84];
604                 char type;
605                 const char *msg;
606
607                 strcpy(quickref, status_abbrev(ref->old_sha1));
608                 if (ref->nonfastforward) {
609                         strcat(quickref, "...");
610                         type = '+';
611                         msg = "forced update";
612                 } else {
613                         strcat(quickref, "..");
614                         type = ' ';
615                         msg = NULL;
616                 }
617                 strcat(quickref, status_abbrev(ref->new_sha1));
618
619                 print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
620         }
621 }
622
623 static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
624 {
625         if (!count)
626                 fprintf(stderr, "To %s\n", dest);
627
628         switch(ref->status) {
629         case REF_STATUS_NONE:
630                 print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
631                 break;
632         case REF_STATUS_REJECT_NODELETE:
633                 print_ref_status('!', "[rejected]", ref, NULL,
634                                                  "remote does not support deleting refs", porcelain);
635                 break;
636         case REF_STATUS_UPTODATE:
637                 print_ref_status('=', "[up to date]", ref,
638                                                  ref->peer_ref, NULL, porcelain);
639                 break;
640         case REF_STATUS_REJECT_NONFASTFORWARD:
641                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
642                                                  "non-fast-forward", porcelain);
643                 break;
644         case REF_STATUS_REMOTE_REJECT:
645                 print_ref_status('!', "[remote rejected]", ref,
646                                                  ref->deletion ? NULL : ref->peer_ref,
647                                                  ref->remote_status, porcelain);
648                 break;
649         case REF_STATUS_EXPECTING_REPORT:
650                 print_ref_status('!', "[remote failure]", ref,
651                                                  ref->deletion ? NULL : ref->peer_ref,
652                                                  "remote failed to report status", porcelain);
653                 break;
654         case REF_STATUS_OK:
655                 print_ok_ref_status(ref, porcelain);
656                 break;
657         }
658
659         return 1;
660 }
661
662 static void print_push_status(const char *dest, struct ref *refs,
663                               int verbose, int porcelain, int * nonfastforward)
664 {
665         struct ref *ref;
666         int n = 0;
667
668         if (verbose) {
669                 for (ref = refs; ref; ref = ref->next)
670                         if (ref->status == REF_STATUS_UPTODATE)
671                                 n += print_one_push_status(ref, dest, n, porcelain);
672         }
673
674         for (ref = refs; ref; ref = ref->next)
675                 if (ref->status == REF_STATUS_OK)
676                         n += print_one_push_status(ref, dest, n, porcelain);
677
678         *nonfastforward = 0;
679         for (ref = refs; ref; ref = ref->next) {
680                 if (ref->status != REF_STATUS_NONE &&
681                     ref->status != REF_STATUS_UPTODATE &&
682                     ref->status != REF_STATUS_OK)
683                         n += print_one_push_status(ref, dest, n, porcelain);
684                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD)
685                         *nonfastforward = 1;
686         }
687 }
688
689 static void verify_remote_names(int nr_heads, const char **heads)
690 {
691         int i;
692
693         for (i = 0; i < nr_heads; i++) {
694                 const char *local = heads[i];
695                 const char *remote = strrchr(heads[i], ':');
696
697                 if (*local == '+')
698                         local++;
699
700                 /* A matching refspec is okay.  */
701                 if (remote == local && remote[1] == '\0')
702                         continue;
703
704                 remote = remote ? (remote + 1) : local;
705                 switch (check_ref_format(remote)) {
706                 case 0: /* ok */
707                 case CHECK_REF_FORMAT_ONELEVEL:
708                         /* ok but a single level -- that is fine for
709                          * a match pattern.
710                          */
711                 case CHECK_REF_FORMAT_WILDCARD:
712                         /* ok but ends with a pattern-match character */
713                         continue;
714                 }
715                 die("remote part of refspec is not a valid name in %s",
716                     heads[i]);
717         }
718 }
719
720 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
721 {
722         struct git_transport_data *data = transport->data;
723         struct send_pack_args args;
724         int ret;
725
726         if (!data->conn) {
727                 struct ref *tmp_refs;
728                 connect_setup(transport, 1, 0);
729
730                 get_remote_heads(data->fd[0], &tmp_refs, 0, NULL, REF_NORMAL,
731                                  NULL);
732         }
733
734         memset(&args, 0, sizeof(args));
735         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
736         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
737         args.use_thin_pack = data->thin;
738         args.verbose = !!(flags & TRANSPORT_PUSH_VERBOSE);
739         args.quiet = !!(flags & TRANSPORT_PUSH_QUIET);
740         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
741
742         ret = send_pack(&args, data->fd, data->conn, remote_refs,
743                         &data->extra_have);
744
745         close(data->fd[1]);
746         close(data->fd[0]);
747         ret |= finish_connect(data->conn);
748         data->conn = NULL;
749
750         return ret;
751 }
752
753 static int disconnect_git(struct transport *transport)
754 {
755         struct git_transport_data *data = transport->data;
756         if (data->conn) {
757                 packet_flush(data->fd[1]);
758                 close(data->fd[0]);
759                 close(data->fd[1]);
760                 finish_connect(data->conn);
761         }
762
763         free(data);
764         return 0;
765 }
766
767 static int is_local(const char *url)
768 {
769         const char *colon = strchr(url, ':');
770         const char *slash = strchr(url, '/');
771         return !colon || (slash && slash < colon) ||
772                 has_dos_drive_prefix(url);
773 }
774
775 static int is_file(const char *url)
776 {
777         struct stat buf;
778         if (stat(url, &buf))
779                 return 0;
780         return S_ISREG(buf.st_mode);
781 }
782
783 struct transport *transport_get(struct remote *remote, const char *url)
784 {
785         struct transport *ret = xcalloc(1, sizeof(*ret));
786
787         if (!remote)
788                 die("No remote provided to transport_get()");
789
790         ret->remote = remote;
791         ret->url = url;
792
793         if (!prefixcmp(url, "rsync:")) {
794                 ret->get_refs_list = get_refs_via_rsync;
795                 ret->fetch = fetch_objs_via_rsync;
796                 ret->push = rsync_transport_push;
797
798         } else if (!prefixcmp(url, "http://")
799                 || !prefixcmp(url, "https://")
800                 || !prefixcmp(url, "ftp://")) {
801                 transport_helper_init(ret, "curl");
802 #ifdef NO_CURL
803                 error("git was compiled without libcurl support.");
804 #endif
805
806         } else if (is_local(url) && is_file(url)) {
807                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
808                 ret->data = data;
809                 ret->get_refs_list = get_refs_from_bundle;
810                 ret->fetch = fetch_refs_from_bundle;
811                 ret->disconnect = close_bundle;
812
813         } else {
814                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
815                 ret->data = data;
816                 ret->set_option = set_git_option;
817                 ret->get_refs_list = get_refs_via_connect;
818                 ret->fetch = fetch_refs_via_pack;
819                 ret->push_refs = git_transport_push;
820                 ret->disconnect = disconnect_git;
821
822                 data->thin = 1;
823                 data->conn = NULL;
824                 data->uploadpack = "git-upload-pack";
825                 if (remote->uploadpack)
826                         data->uploadpack = remote->uploadpack;
827                 data->receivepack = "git-receive-pack";
828                 if (remote->receivepack)
829                         data->receivepack = remote->receivepack;
830         }
831
832         return ret;
833 }
834
835 int transport_set_option(struct transport *transport,
836                          const char *name, const char *value)
837 {
838         if (transport->set_option)
839                 return transport->set_option(transport, name, value);
840         return 1;
841 }
842
843 int transport_push(struct transport *transport,
844                    int refspec_nr, const char **refspec, int flags,
845                    int *nonfastforward)
846 {
847         *nonfastforward = 0;
848         verify_remote_names(refspec_nr, refspec);
849
850         if (transport->push)
851                 return transport->push(transport, refspec_nr, refspec, flags);
852         if (transport->push_refs) {
853                 struct ref *remote_refs =
854                         transport->get_refs_list(transport, 1);
855                 struct ref *local_refs = get_local_heads();
856                 int match_flags = MATCH_REFS_NONE;
857                 int verbose = flags & TRANSPORT_PUSH_VERBOSE;
858                 int quiet = flags & TRANSPORT_PUSH_QUIET;
859                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
860                 int ret;
861
862                 if (flags & TRANSPORT_PUSH_ALL)
863                         match_flags |= MATCH_REFS_ALL;
864                 if (flags & TRANSPORT_PUSH_MIRROR)
865                         match_flags |= MATCH_REFS_MIRROR;
866
867                 if (match_refs(local_refs, &remote_refs,
868                                refspec_nr, refspec, match_flags)) {
869                         return -1;
870                 }
871
872                 ret = transport->push_refs(transport, remote_refs, flags);
873
874                 if (!quiet || push_had_errors(remote_refs))
875                         print_push_status(transport->url, remote_refs,
876                                         verbose | porcelain, porcelain,
877                                         nonfastforward);
878
879                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
880                         struct ref *ref;
881                         for (ref = remote_refs; ref; ref = ref->next)
882                                 update_tracking_ref(transport->remote, ref, verbose);
883                 }
884
885                 if (!quiet && !ret && !refs_pushed(remote_refs))
886                         fprintf(stderr, "Everything up-to-date\n");
887                 return ret;
888         }
889         return 1;
890 }
891
892 const struct ref *transport_get_remote_refs(struct transport *transport)
893 {
894         if (!transport->remote_refs)
895                 transport->remote_refs = transport->get_refs_list(transport, 0);
896         return transport->remote_refs;
897 }
898
899 int transport_fetch_refs(struct transport *transport, const struct ref *refs)
900 {
901         int rc;
902         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
903         const struct ref **heads = NULL;
904         const struct ref *rm;
905
906         for (rm = refs; rm; rm = rm->next) {
907                 nr_refs++;
908                 if (rm->peer_ref &&
909                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
910                         continue;
911                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
912                 heads[nr_heads++] = rm;
913         }
914
915         if (!nr_heads) {
916                 /*
917                  * When deepening of a shallow repository is requested,
918                  * then local and remote refs are likely to still be equal.
919                  * Just feed them all to the fetch method in that case.
920                  * This condition shouldn't be met in a non-deepening fetch
921                  * (see builtin-fetch.c:quickfetch()).
922                  */
923                 heads = xmalloc(nr_refs * sizeof(*heads));
924                 for (rm = refs; rm; rm = rm->next)
925                         heads[nr_heads++] = rm;
926         }
927
928         rc = transport->fetch(transport, nr_heads, heads);
929         free(heads);
930         return rc;
931 }
932
933 void transport_unlock_pack(struct transport *transport)
934 {
935         if (transport->pack_lockfile) {
936                 unlink_or_warn(transport->pack_lockfile);
937                 free(transport->pack_lockfile);
938                 transport->pack_lockfile = NULL;
939         }
940 }
941
942 int transport_disconnect(struct transport *transport)
943 {
944         int ret = 0;
945         if (transport->disconnect)
946                 ret = transport->disconnect(transport);
947         free(transport);
948         return ret;
949 }
950
951 /*
952  * Strip username (and password) from an url and return
953  * it in a newly allocated string.
954  */
955 char *transport_anonymize_url(const char *url)
956 {
957         char *anon_url, *scheme_prefix, *anon_part;
958         size_t anon_len, prefix_len = 0;
959
960         anon_part = strchr(url, '@');
961         if (is_local(url) || !anon_part)
962                 goto literal_copy;
963
964         anon_len = strlen(++anon_part);
965         scheme_prefix = strstr(url, "://");
966         if (!scheme_prefix) {
967                 if (!strchr(anon_part, ':'))
968                         /* cannot be "me@there:/path/name" */
969                         goto literal_copy;
970         } else {
971                 const char *cp;
972                 /* make sure scheme is reasonable */
973                 for (cp = url; cp < scheme_prefix; cp++) {
974                         switch (*cp) {
975                                 /* RFC 1738 2.1 */
976                         case '+': case '.': case '-':
977                                 break; /* ok */
978                         default:
979                                 if (isalnum(*cp))
980                                         break;
981                                 /* it isn't */
982                                 goto literal_copy;
983                         }
984                 }
985                 /* @ past the first slash does not count */
986                 cp = strchr(scheme_prefix + 3, '/');
987                 if (cp && cp < anon_part)
988                         goto literal_copy;
989                 prefix_len = scheme_prefix - url + 3;
990         }
991         anon_url = xcalloc(1, 1 + prefix_len + anon_len);
992         memcpy(anon_url, url, prefix_len);
993         memcpy(anon_url + prefix_len, anon_part, anon_len);
994         return anon_url;
995 literal_copy:
996         return xstrdup(url);
997 }