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[git] / builtin-send-pack.c
1 #include "cache.h"
2 #include "commit.h"
3 #include "tag.h"
4 #include "refs.h"
5 #include "pkt-line.h"
6 #include "run-command.h"
7 #include "remote.h"
8 #include "send-pack.h"
9
10 static const char send_pack_usage[] =
11 "git send-pack [--all | --mirror] [--dry-run] [--force] [--receive-pack=<git-receive-pack>] [--verbose] [--thin] [<host>:]<directory> [<ref>...]\n"
12 "  --all and explicit <ref> specification are mutually exclusive.";
13
14 static struct send_pack_args args = {
15         /* .receivepack = */ "git-receive-pack",
16 };
17
18 static int feed_object(const unsigned char *sha1, int fd, int negative)
19 {
20         char buf[42];
21
22         if (negative && !has_sha1_file(sha1))
23                 return 1;
24
25         memcpy(buf + negative, sha1_to_hex(sha1), 40);
26         if (negative)
27                 buf[0] = '^';
28         buf[40 + negative] = '\n';
29         return write_or_whine(fd, buf, 41 + negative, "send-pack: send refs");
30 }
31
32 /*
33  * Make a pack stream and spit it out into file descriptor fd
34  */
35 static int pack_objects(int fd, struct ref *refs, struct extra_have_objects *extra)
36 {
37         /*
38          * The child becomes pack-objects --revs; we feed
39          * the revision parameters to it via its stdin and
40          * let its stdout go back to the other end.
41          */
42         const char *argv[] = {
43                 "pack-objects",
44                 "--all-progress",
45                 "--revs",
46                 "--stdout",
47                 NULL,
48                 NULL,
49         };
50         struct child_process po;
51         int i;
52
53         if (args.use_thin_pack)
54                 argv[4] = "--thin";
55         memset(&po, 0, sizeof(po));
56         po.argv = argv;
57         po.in = -1;
58         po.out = fd;
59         po.git_cmd = 1;
60         if (start_command(&po))
61                 die("git pack-objects failed (%s)", strerror(errno));
62
63         /*
64          * We feed the pack-objects we just spawned with revision
65          * parameters by writing to the pipe.
66          */
67         for (i = 0; i < extra->nr; i++)
68                 if (!feed_object(extra->array[i], po.in, 1))
69                         break;
70
71         while (refs) {
72                 if (!is_null_sha1(refs->old_sha1) &&
73                     !feed_object(refs->old_sha1, po.in, 1))
74                         break;
75                 if (!is_null_sha1(refs->new_sha1) &&
76                     !feed_object(refs->new_sha1, po.in, 0))
77                         break;
78                 refs = refs->next;
79         }
80
81         close(po.in);
82         if (finish_command(&po))
83                 return error("pack-objects died with strange error");
84         return 0;
85 }
86
87 static void unmark_and_free(struct commit_list *list, unsigned int mark)
88 {
89         while (list) {
90                 struct commit_list *temp = list;
91                 temp->item->object.flags &= ~mark;
92                 list = temp->next;
93                 free(temp);
94         }
95 }
96
97 static int ref_newer(const unsigned char *new_sha1,
98                      const unsigned char *old_sha1)
99 {
100         struct object *o;
101         struct commit *old, *new;
102         struct commit_list *list, *used;
103         int found = 0;
104
105         /* Both new and old must be commit-ish and new is descendant of
106          * old.  Otherwise we require --force.
107          */
108         o = deref_tag(parse_object(old_sha1), NULL, 0);
109         if (!o || o->type != OBJ_COMMIT)
110                 return 0;
111         old = (struct commit *) o;
112
113         o = deref_tag(parse_object(new_sha1), NULL, 0);
114         if (!o || o->type != OBJ_COMMIT)
115                 return 0;
116         new = (struct commit *) o;
117
118         if (parse_commit(new) < 0)
119                 return 0;
120
121         used = list = NULL;
122         commit_list_insert(new, &list);
123         while (list) {
124                 new = pop_most_recent_commit(&list, 1);
125                 commit_list_insert(new, &used);
126                 if (new == old) {
127                         found = 1;
128                         break;
129                 }
130         }
131         unmark_and_free(list, 1);
132         unmark_and_free(used, 1);
133         return found;
134 }
135
136 static struct ref *local_refs, **local_tail;
137 static struct ref *remote_refs, **remote_tail;
138
139 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
140 {
141         struct ref *ref;
142         int len;
143
144         /* we already know it starts with refs/ to get here */
145         if (check_ref_format(refname + 5))
146                 return 0;
147
148         len = strlen(refname) + 1;
149         ref = xcalloc(1, sizeof(*ref) + len);
150         hashcpy(ref->new_sha1, sha1);
151         memcpy(ref->name, refname, len);
152         *local_tail = ref;
153         local_tail = &ref->next;
154         return 0;
155 }
156
157 static void get_local_heads(void)
158 {
159         local_tail = &local_refs;
160         for_each_ref(one_local_ref, NULL);
161 }
162
163 static int receive_status(int in, struct ref *refs)
164 {
165         struct ref *hint;
166         char line[1000];
167         int ret = 0;
168         int len = packet_read_line(in, line, sizeof(line));
169         if (len < 10 || memcmp(line, "unpack ", 7))
170                 return error("did not receive remote status");
171         if (memcmp(line, "unpack ok\n", 10)) {
172                 char *p = line + strlen(line) - 1;
173                 if (*p == '\n')
174                         *p = '\0';
175                 error("unpack failed: %s", line + 7);
176                 ret = -1;
177         }
178         hint = NULL;
179         while (1) {
180                 char *refname;
181                 char *msg;
182                 len = packet_read_line(in, line, sizeof(line));
183                 if (!len)
184                         break;
185                 if (len < 3 ||
186                     (memcmp(line, "ok ", 3) && memcmp(line, "ng ", 3))) {
187                         fprintf(stderr, "protocol error: %s\n", line);
188                         ret = -1;
189                         break;
190                 }
191
192                 line[strlen(line)-1] = '\0';
193                 refname = line + 3;
194                 msg = strchr(refname, ' ');
195                 if (msg)
196                         *msg++ = '\0';
197
198                 /* first try searching at our hint, falling back to all refs */
199                 if (hint)
200                         hint = find_ref_by_name(hint, refname);
201                 if (!hint)
202                         hint = find_ref_by_name(refs, refname);
203                 if (!hint) {
204                         warning("remote reported status on unknown ref: %s",
205                                         refname);
206                         continue;
207                 }
208                 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
209                         warning("remote reported status on unexpected ref: %s",
210                                         refname);
211                         continue;
212                 }
213
214                 if (line[0] == 'o' && line[1] == 'k')
215                         hint->status = REF_STATUS_OK;
216                 else {
217                         hint->status = REF_STATUS_REMOTE_REJECT;
218                         ret = -1;
219                 }
220                 if (msg)
221                         hint->remote_status = xstrdup(msg);
222                 /* start our next search from the next ref */
223                 hint = hint->next;
224         }
225         return ret;
226 }
227
228 static void update_tracking_ref(struct remote *remote, struct ref *ref)
229 {
230         struct refspec rs;
231
232         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
233                 return;
234
235         rs.src = ref->name;
236         rs.dst = NULL;
237
238         if (!remote_find_tracking(remote, &rs)) {
239                 if (args.verbose)
240                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
241                 if (ref->deletion) {
242                         delete_ref(rs.dst, NULL, 0);
243                 } else
244                         update_ref("update by push", rs.dst,
245                                         ref->new_sha1, NULL, 0, 0);
246                 free(rs.dst);
247         }
248 }
249
250 static const char *prettify_ref(const struct ref *ref)
251 {
252         const char *name = ref->name;
253         return name + (
254                 !prefixcmp(name, "refs/heads/") ? 11 :
255                 !prefixcmp(name, "refs/tags/") ? 10 :
256                 !prefixcmp(name, "refs/remotes/") ? 13 :
257                 0);
258 }
259
260 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
261
262 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg)
263 {
264         fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary);
265         if (from)
266                 fprintf(stderr, "%s -> %s", prettify_ref(from), prettify_ref(to));
267         else
268                 fputs(prettify_ref(to), stderr);
269         if (msg) {
270                 fputs(" (", stderr);
271                 fputs(msg, stderr);
272                 fputc(')', stderr);
273         }
274         fputc('\n', stderr);
275 }
276
277 static const char *status_abbrev(unsigned char sha1[20])
278 {
279         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
280 }
281
282 static void print_ok_ref_status(struct ref *ref)
283 {
284         if (ref->deletion)
285                 print_ref_status('-', "[deleted]", ref, NULL, NULL);
286         else if (is_null_sha1(ref->old_sha1))
287                 print_ref_status('*',
288                         (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
289                           "[new branch]"),
290                         ref, ref->peer_ref, NULL);
291         else {
292                 char quickref[84];
293                 char type;
294                 const char *msg;
295
296                 strcpy(quickref, status_abbrev(ref->old_sha1));
297                 if (ref->nonfastforward) {
298                         strcat(quickref, "...");
299                         type = '+';
300                         msg = "forced update";
301                 } else {
302                         strcat(quickref, "..");
303                         type = ' ';
304                         msg = NULL;
305                 }
306                 strcat(quickref, status_abbrev(ref->new_sha1));
307
308                 print_ref_status(type, quickref, ref, ref->peer_ref, msg);
309         }
310 }
311
312 static int print_one_push_status(struct ref *ref, const char *dest, int count)
313 {
314         if (!count)
315                 fprintf(stderr, "To %s\n", dest);
316
317         switch(ref->status) {
318         case REF_STATUS_NONE:
319                 print_ref_status('X', "[no match]", ref, NULL, NULL);
320                 break;
321         case REF_STATUS_REJECT_NODELETE:
322                 print_ref_status('!', "[rejected]", ref, NULL,
323                                 "remote does not support deleting refs");
324                 break;
325         case REF_STATUS_UPTODATE:
326                 print_ref_status('=', "[up to date]", ref,
327                                 ref->peer_ref, NULL);
328                 break;
329         case REF_STATUS_REJECT_NONFASTFORWARD:
330                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
331                                 "non-fast forward");
332                 break;
333         case REF_STATUS_REMOTE_REJECT:
334                 print_ref_status('!', "[remote rejected]", ref,
335                                 ref->deletion ? NULL : ref->peer_ref,
336                                 ref->remote_status);
337                 break;
338         case REF_STATUS_EXPECTING_REPORT:
339                 print_ref_status('!', "[remote failure]", ref,
340                                 ref->deletion ? NULL : ref->peer_ref,
341                                 "remote failed to report status");
342                 break;
343         case REF_STATUS_OK:
344                 print_ok_ref_status(ref);
345                 break;
346         }
347
348         return 1;
349 }
350
351 static void print_push_status(const char *dest, struct ref *refs)
352 {
353         struct ref *ref;
354         int n = 0;
355
356         if (args.verbose) {
357                 for (ref = refs; ref; ref = ref->next)
358                         if (ref->status == REF_STATUS_UPTODATE)
359                                 n += print_one_push_status(ref, dest, n);
360         }
361
362         for (ref = refs; ref; ref = ref->next)
363                 if (ref->status == REF_STATUS_OK)
364                         n += print_one_push_status(ref, dest, n);
365
366         for (ref = refs; ref; ref = ref->next) {
367                 if (ref->status != REF_STATUS_NONE &&
368                     ref->status != REF_STATUS_UPTODATE &&
369                     ref->status != REF_STATUS_OK)
370                         n += print_one_push_status(ref, dest, n);
371         }
372 }
373
374 static int refs_pushed(struct ref *ref)
375 {
376         for (; ref; ref = ref->next) {
377                 switch(ref->status) {
378                 case REF_STATUS_NONE:
379                 case REF_STATUS_UPTODATE:
380                         break;
381                 default:
382                         return 1;
383                 }
384         }
385         return 0;
386 }
387
388 static int do_send_pack(int in, int out, struct remote *remote, const char *dest, int nr_refspec, const char **refspec)
389 {
390         struct ref *ref;
391         int new_refs;
392         int ask_for_status_report = 0;
393         int allow_deleting_refs = 0;
394         int expect_status_report = 0;
395         int flags = MATCH_REFS_NONE;
396         int ret;
397         struct extra_have_objects extra_have;
398
399         memset(&extra_have, 0, sizeof(extra_have));
400         if (args.send_all)
401                 flags |= MATCH_REFS_ALL;
402         if (args.send_mirror)
403                 flags |= MATCH_REFS_MIRROR;
404
405         /* No funny business with the matcher */
406         remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL,
407                                        &extra_have);
408         get_local_heads();
409
410         /* Does the other end support the reporting? */
411         if (server_supports("report-status"))
412                 ask_for_status_report = 1;
413         if (server_supports("delete-refs"))
414                 allow_deleting_refs = 1;
415
416         /* match them up */
417         if (!remote_tail)
418                 remote_tail = &remote_refs;
419         if (match_refs(local_refs, remote_refs, &remote_tail,
420                        nr_refspec, refspec, flags)) {
421                 close(out);
422                 return -1;
423         }
424
425         if (!remote_refs) {
426                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
427                         "Perhaps you should specify a branch such as 'master'.\n");
428                 close(out);
429                 return 0;
430         }
431
432         /*
433          * Finally, tell the other end!
434          */
435         new_refs = 0;
436         for (ref = remote_refs; ref; ref = ref->next) {
437
438                 if (ref->peer_ref)
439                         hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
440                 else if (!args.send_mirror)
441                         continue;
442
443                 ref->deletion = is_null_sha1(ref->new_sha1);
444                 if (ref->deletion && !allow_deleting_refs) {
445                         ref->status = REF_STATUS_REJECT_NODELETE;
446                         continue;
447                 }
448                 if (!ref->deletion &&
449                     !hashcmp(ref->old_sha1, ref->new_sha1)) {
450                         ref->status = REF_STATUS_UPTODATE;
451                         continue;
452                 }
453
454                 /* This part determines what can overwrite what.
455                  * The rules are:
456                  *
457                  * (0) you can always use --force or +A:B notation to
458                  *     selectively force individual ref pairs.
459                  *
460                  * (1) if the old thing does not exist, it is OK.
461                  *
462                  * (2) if you do not have the old thing, you are not allowed
463                  *     to overwrite it; you would not know what you are losing
464                  *     otherwise.
465                  *
466                  * (3) if both new and old are commit-ish, and new is a
467                  *     descendant of old, it is OK.
468                  *
469                  * (4) regardless of all of the above, removing :B is
470                  *     always allowed.
471                  */
472
473                 ref->nonfastforward =
474                     !ref->deletion &&
475                     !is_null_sha1(ref->old_sha1) &&
476                     (!has_sha1_file(ref->old_sha1)
477                       || !ref_newer(ref->new_sha1, ref->old_sha1));
478
479                 if (ref->nonfastforward && !ref->force && !args.force_update) {
480                         ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
481                         continue;
482                 }
483
484                 if (!ref->deletion)
485                         new_refs++;
486
487                 if (!args.dry_run) {
488                         char *old_hex = sha1_to_hex(ref->old_sha1);
489                         char *new_hex = sha1_to_hex(ref->new_sha1);
490
491                         if (ask_for_status_report) {
492                                 packet_write(out, "%s %s %s%c%s",
493                                         old_hex, new_hex, ref->name, 0,
494                                         "report-status");
495                                 ask_for_status_report = 0;
496                                 expect_status_report = 1;
497                         }
498                         else
499                                 packet_write(out, "%s %s %s",
500                                         old_hex, new_hex, ref->name);
501                 }
502                 ref->status = expect_status_report ?
503                         REF_STATUS_EXPECTING_REPORT :
504                         REF_STATUS_OK;
505         }
506
507         packet_flush(out);
508         if (new_refs && !args.dry_run) {
509                 if (pack_objects(out, remote_refs, &extra_have) < 0)
510                         return -1;
511         }
512         else
513                 close(out);
514
515         if (expect_status_report)
516                 ret = receive_status(in, remote_refs);
517         else
518                 ret = 0;
519
520         print_push_status(dest, remote_refs);
521
522         if (!args.dry_run && remote) {
523                 for (ref = remote_refs; ref; ref = ref->next)
524                         update_tracking_ref(remote, ref);
525         }
526
527         if (!refs_pushed(remote_refs))
528                 fprintf(stderr, "Everything up-to-date\n");
529         if (ret < 0)
530                 return ret;
531         for (ref = remote_refs; ref; ref = ref->next) {
532                 switch (ref->status) {
533                 case REF_STATUS_NONE:
534                 case REF_STATUS_UPTODATE:
535                 case REF_STATUS_OK:
536                         break;
537                 default:
538                         return -1;
539                 }
540         }
541         return 0;
542 }
543
544 static void verify_remote_names(int nr_heads, const char **heads)
545 {
546         int i;
547
548         for (i = 0; i < nr_heads; i++) {
549                 const char *local = heads[i];
550                 const char *remote = strrchr(heads[i], ':');
551
552                 if (*local == '+')
553                         local++;
554
555                 /* A matching refspec is okay.  */
556                 if (remote == local && remote[1] == '\0')
557                         continue;
558
559                 remote = remote ? (remote + 1) : local;
560                 switch (check_ref_format(remote)) {
561                 case 0: /* ok */
562                 case CHECK_REF_FORMAT_ONELEVEL:
563                         /* ok but a single level -- that is fine for
564                          * a match pattern.
565                          */
566                 case CHECK_REF_FORMAT_WILDCARD:
567                         /* ok but ends with a pattern-match character */
568                         continue;
569                 }
570                 die("remote part of refspec is not a valid name in %s",
571                     heads[i]);
572         }
573 }
574
575 int cmd_send_pack(int argc, const char **argv, const char *prefix)
576 {
577         int i, nr_heads = 0;
578         const char **heads = NULL;
579         const char *remote_name = NULL;
580         struct remote *remote = NULL;
581         const char *dest = NULL;
582
583         argv++;
584         for (i = 1; i < argc; i++, argv++) {
585                 const char *arg = *argv;
586
587                 if (*arg == '-') {
588                         if (!prefixcmp(arg, "--receive-pack=")) {
589                                 args.receivepack = arg + 15;
590                                 continue;
591                         }
592                         if (!prefixcmp(arg, "--exec=")) {
593                                 args.receivepack = arg + 7;
594                                 continue;
595                         }
596                         if (!prefixcmp(arg, "--remote=")) {
597                                 remote_name = arg + 9;
598                                 continue;
599                         }
600                         if (!strcmp(arg, "--all")) {
601                                 args.send_all = 1;
602                                 continue;
603                         }
604                         if (!strcmp(arg, "--dry-run")) {
605                                 args.dry_run = 1;
606                                 continue;
607                         }
608                         if (!strcmp(arg, "--mirror")) {
609                                 args.send_mirror = 1;
610                                 continue;
611                         }
612                         if (!strcmp(arg, "--force")) {
613                                 args.force_update = 1;
614                                 continue;
615                         }
616                         if (!strcmp(arg, "--verbose")) {
617                                 args.verbose = 1;
618                                 continue;
619                         }
620                         if (!strcmp(arg, "--thin")) {
621                                 args.use_thin_pack = 1;
622                                 continue;
623                         }
624                         usage(send_pack_usage);
625                 }
626                 if (!dest) {
627                         dest = arg;
628                         continue;
629                 }
630                 heads = (const char **) argv;
631                 nr_heads = argc - i;
632                 break;
633         }
634         if (!dest)
635                 usage(send_pack_usage);
636         /*
637          * --all and --mirror are incompatible; neither makes sense
638          * with any refspecs.
639          */
640         if ((heads && (args.send_all || args.send_mirror)) ||
641                                         (args.send_all && args.send_mirror))
642                 usage(send_pack_usage);
643
644         if (remote_name) {
645                 remote = remote_get(remote_name);
646                 if (!remote_has_url(remote, dest)) {
647                         die("Destination %s is not a uri for %s",
648                             dest, remote_name);
649                 }
650         }
651
652         return send_pack(&args, dest, remote, nr_heads, heads);
653 }
654
655 int send_pack(struct send_pack_args *my_args,
656               const char *dest, struct remote *remote,
657               int nr_heads, const char **heads)
658 {
659         int fd[2], ret;
660         struct child_process *conn;
661
662         memcpy(&args, my_args, sizeof(args));
663
664         verify_remote_names(nr_heads, heads);
665
666         conn = git_connect(fd, dest, args.receivepack, args.verbose ? CONNECT_VERBOSE : 0);
667         ret = do_send_pack(fd[0], fd[1], remote, dest, nr_heads, heads);
668         close(fd[0]);
669         /* do_send_pack always closes fd[1] */
670         ret |= finish_connect(conn);
671         return !!ret;
672 }