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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 /*
19  * Make a pack stream and spit it out into file descriptor fd
20  */
21 static int pack_objects(int fd, struct ref *refs)
22 {
23         /*
24          * The child becomes pack-objects --revs; we feed
25          * the revision parameters to it via its stdin and
26          * let its stdout go back to the other end.
27          */
28         const char *argv[] = {
29                 "pack-objects",
30                 "--all-progress",
31                 "--revs",
32                 "--stdout",
33                 NULL,
34                 NULL,
35         };
36         struct child_process po;
37
38         if (args.use_thin_pack)
39                 argv[4] = "--thin";
40         memset(&po, 0, sizeof(po));
41         po.argv = argv;
42         po.in = -1;
43         po.out = fd;
44         po.git_cmd = 1;
45         if (start_command(&po))
46                 die("git-pack-objects failed (%s)", strerror(errno));
47
48         /*
49          * We feed the pack-objects we just spawned with revision
50          * parameters by writing to the pipe.
51          */
52         while (refs) {
53                 char buf[42];
54
55                 if (!is_null_sha1(refs->old_sha1) &&
56                     has_sha1_file(refs->old_sha1)) {
57                         memcpy(buf + 1, sha1_to_hex(refs->old_sha1), 40);
58                         buf[0] = '^';
59                         buf[41] = '\n';
60                         if (!write_or_whine(po.in, buf, 42,
61                                                 "send-pack: send refs"))
62                                 break;
63                 }
64                 if (!is_null_sha1(refs->new_sha1)) {
65                         memcpy(buf, sha1_to_hex(refs->new_sha1), 40);
66                         buf[40] = '\n';
67                         if (!write_or_whine(po.in, buf, 41,
68                                                 "send-pack: send refs"))
69                                 break;
70                 }
71                 refs = refs->next;
72         }
73
74         close(po.in);
75         if (finish_command(&po))
76                 return error("pack-objects died with strange error");
77         return 0;
78 }
79
80 static void unmark_and_free(struct commit_list *list, unsigned int mark)
81 {
82         while (list) {
83                 struct commit_list *temp = list;
84                 temp->item->object.flags &= ~mark;
85                 list = temp->next;
86                 free(temp);
87         }
88 }
89
90 static int ref_newer(const unsigned char *new_sha1,
91                      const unsigned char *old_sha1)
92 {
93         struct object *o;
94         struct commit *old, *new;
95         struct commit_list *list, *used;
96         int found = 0;
97
98         /* Both new and old must be commit-ish and new is descendant of
99          * old.  Otherwise we require --force.
100          */
101         o = deref_tag(parse_object(old_sha1), NULL, 0);
102         if (!o || o->type != OBJ_COMMIT)
103                 return 0;
104         old = (struct commit *) o;
105
106         o = deref_tag(parse_object(new_sha1), NULL, 0);
107         if (!o || o->type != OBJ_COMMIT)
108                 return 0;
109         new = (struct commit *) o;
110
111         if (parse_commit(new) < 0)
112                 return 0;
113
114         used = list = NULL;
115         commit_list_insert(new, &list);
116         while (list) {
117                 new = pop_most_recent_commit(&list, 1);
118                 commit_list_insert(new, &used);
119                 if (new == old) {
120                         found = 1;
121                         break;
122                 }
123         }
124         unmark_and_free(list, 1);
125         unmark_and_free(used, 1);
126         return found;
127 }
128
129 static struct ref *local_refs, **local_tail;
130 static struct ref *remote_refs, **remote_tail;
131
132 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
133 {
134         struct ref *ref;
135         int len = strlen(refname) + 1;
136         ref = xcalloc(1, sizeof(*ref) + len);
137         hashcpy(ref->new_sha1, sha1);
138         memcpy(ref->name, refname, len);
139         *local_tail = ref;
140         local_tail = &ref->next;
141         return 0;
142 }
143
144 static void get_local_heads(void)
145 {
146         local_tail = &local_refs;
147         for_each_ref(one_local_ref, NULL);
148 }
149
150 static int receive_status(int in, struct ref *refs)
151 {
152         struct ref *hint;
153         char line[1000];
154         int ret = 0;
155         int len = packet_read_line(in, line, sizeof(line));
156         if (len < 10 || memcmp(line, "unpack ", 7))
157                 return error("did not receive remote status");
158         if (memcmp(line, "unpack ok\n", 10)) {
159                 char *p = line + strlen(line) - 1;
160                 if (*p == '\n')
161                         *p = '\0';
162                 error("unpack failed: %s", line + 7);
163                 ret = -1;
164         }
165         hint = NULL;
166         while (1) {
167                 char *refname;
168                 char *msg;
169                 len = packet_read_line(in, line, sizeof(line));
170                 if (!len)
171                         break;
172                 if (len < 3 ||
173                     (memcmp(line, "ok ", 3) && memcmp(line, "ng ", 3))) {
174                         fprintf(stderr, "protocol error: %s\n", line);
175                         ret = -1;
176                         break;
177                 }
178
179                 line[strlen(line)-1] = '\0';
180                 refname = line + 3;
181                 msg = strchr(refname, ' ');
182                 if (msg)
183                         *msg++ = '\0';
184
185                 /* first try searching at our hint, falling back to all refs */
186                 if (hint)
187                         hint = find_ref_by_name(hint, refname);
188                 if (!hint)
189                         hint = find_ref_by_name(refs, refname);
190                 if (!hint) {
191                         warning("remote reported status on unknown ref: %s",
192                                         refname);
193                         continue;
194                 }
195                 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
196                         warning("remote reported status on unexpected ref: %s",
197                                         refname);
198                         continue;
199                 }
200
201                 if (line[0] == 'o' && line[1] == 'k')
202                         hint->status = REF_STATUS_OK;
203                 else {
204                         hint->status = REF_STATUS_REMOTE_REJECT;
205                         ret = -1;
206                 }
207                 if (msg)
208                         hint->remote_status = xstrdup(msg);
209                 /* start our next search from the next ref */
210                 hint = hint->next;
211         }
212         return ret;
213 }
214
215 static void update_tracking_ref(struct remote *remote, struct ref *ref)
216 {
217         struct refspec rs;
218
219         if (ref->status != REF_STATUS_OK)
220                 return;
221
222         rs.src = ref->name;
223         rs.dst = NULL;
224
225         if (!remote_find_tracking(remote, &rs)) {
226                 if (args.verbose)
227                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
228                 if (ref->deletion) {
229                         if (delete_ref(rs.dst, NULL))
230                                 error("Failed to delete");
231                 } else
232                         update_ref("update by push", rs.dst,
233                                         ref->new_sha1, NULL, 0, 0);
234                 free(rs.dst);
235         }
236 }
237
238 static const char *prettify_ref(const struct ref *ref)
239 {
240         const char *name = ref->name;
241         return name + (
242                 !prefixcmp(name, "refs/heads/") ? 11 :
243                 !prefixcmp(name, "refs/tags/") ? 10 :
244                 !prefixcmp(name, "refs/remotes/") ? 13 :
245                 0);
246 }
247
248 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
249
250 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg)
251 {
252         fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary);
253         if (from)
254                 fprintf(stderr, "%s -> %s", prettify_ref(from), prettify_ref(to));
255         else
256                 fputs(prettify_ref(to), stderr);
257         if (msg) {
258                 fputs(" (", stderr);
259                 fputs(msg, stderr);
260                 fputc(')', stderr);
261         }
262         fputc('\n', stderr);
263 }
264
265 static const char *status_abbrev(unsigned char sha1[20])
266 {
267         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
268 }
269
270 static void print_ok_ref_status(struct ref *ref)
271 {
272         if (ref->deletion)
273                 print_ref_status('-', "[deleted]", ref, NULL, NULL);
274         else if (is_null_sha1(ref->old_sha1))
275                 print_ref_status('*',
276                         (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
277                           "[new branch]"),
278                         ref, ref->peer_ref, NULL);
279         else {
280                 char quickref[84];
281                 char type;
282                 const char *msg;
283
284                 strcpy(quickref, status_abbrev(ref->old_sha1));
285                 if (ref->nonfastforward) {
286                         strcat(quickref, "...");
287                         type = '+';
288                         msg = "forced update";
289                 } else {
290                         strcat(quickref, "..");
291                         type = ' ';
292                         msg = NULL;
293                 }
294                 strcat(quickref, status_abbrev(ref->new_sha1));
295
296                 print_ref_status(type, quickref, ref, ref->peer_ref, msg);
297         }
298 }
299
300 static int print_one_push_status(struct ref *ref, const char *dest, int count)
301 {
302         if (!count)
303                 fprintf(stderr, "To %s\n", dest);
304
305         switch(ref->status) {
306         case REF_STATUS_NONE:
307                 print_ref_status('X', "[no match]", ref, NULL, NULL);
308                 break;
309         case REF_STATUS_REJECT_NODELETE:
310                 print_ref_status('!', "[rejected]", ref, NULL,
311                                 "remote does not support deleting refs");
312                 break;
313         case REF_STATUS_UPTODATE:
314                 print_ref_status('=', "[up to date]", ref,
315                                 ref->peer_ref, NULL);
316                 break;
317         case REF_STATUS_REJECT_NONFASTFORWARD:
318                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
319                                 "non-fast forward");
320                 break;
321         case REF_STATUS_REMOTE_REJECT:
322                 print_ref_status('!', "[remote rejected]", ref,
323                                 ref->deletion ? NULL : ref->peer_ref,
324                                 ref->remote_status);
325                 break;
326         case REF_STATUS_EXPECTING_REPORT:
327                 print_ref_status('!', "[remote failure]", ref,
328                                 ref->deletion ? NULL : ref->peer_ref,
329                                 "remote failed to report status");
330                 break;
331         case REF_STATUS_OK:
332                 print_ok_ref_status(ref);
333                 break;
334         }
335
336         return 1;
337 }
338
339 static void print_push_status(const char *dest, struct ref *refs)
340 {
341         struct ref *ref;
342         int n = 0;
343
344         if (args.verbose) {
345                 for (ref = refs; ref; ref = ref->next)
346                         if (ref->status == REF_STATUS_UPTODATE)
347                                 n += print_one_push_status(ref, dest, n);
348         }
349
350         for (ref = refs; ref; ref = ref->next)
351                 if (ref->status == REF_STATUS_OK)
352                         n += print_one_push_status(ref, dest, n);
353
354         for (ref = refs; ref; ref = ref->next) {
355                 if (ref->status != REF_STATUS_NONE &&
356                     ref->status != REF_STATUS_UPTODATE &&
357                     ref->status != REF_STATUS_OK)
358                         n += print_one_push_status(ref, dest, n);
359         }
360 }
361
362 static int refs_pushed(struct ref *ref)
363 {
364         for (; ref; ref = ref->next) {
365                 switch(ref->status) {
366                 case REF_STATUS_NONE:
367                 case REF_STATUS_UPTODATE:
368                         break;
369                 default:
370                         return 1;
371                 }
372         }
373         return 0;
374 }
375
376 static int do_send_pack(int in, int out, struct remote *remote, const char *dest, int nr_refspec, const char **refspec)
377 {
378         struct ref *ref;
379         int new_refs;
380         int ask_for_status_report = 0;
381         int allow_deleting_refs = 0;
382         int expect_status_report = 0;
383         int flags = MATCH_REFS_NONE;
384         int ret;
385
386         if (args.send_all)
387                 flags |= MATCH_REFS_ALL;
388         if (args.send_mirror)
389                 flags |= MATCH_REFS_MIRROR;
390
391         /* No funny business with the matcher */
392         remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
393         get_local_heads();
394
395         /* Does the other end support the reporting? */
396         if (server_supports("report-status"))
397                 ask_for_status_report = 1;
398         if (server_supports("delete-refs"))
399                 allow_deleting_refs = 1;
400
401         /* match them up */
402         if (!remote_tail)
403                 remote_tail = &remote_refs;
404         if (match_refs(local_refs, remote_refs, &remote_tail,
405                        nr_refspec, refspec, flags)) {
406                 close(out);
407                 return -1;
408         }
409
410         if (!remote_refs) {
411                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
412                         "Perhaps you should specify a branch such as 'master'.\n");
413                 close(out);
414                 return 0;
415         }
416
417         /*
418          * Finally, tell the other end!
419          */
420         new_refs = 0;
421         for (ref = remote_refs; ref; ref = ref->next) {
422                 const unsigned char *new_sha1;
423
424                 if (!ref->peer_ref) {
425                         if (!args.send_mirror)
426                                 continue;
427                         new_sha1 = null_sha1;
428                 }
429                 else
430                         new_sha1 = ref->peer_ref->new_sha1;
431
432
433                 ref->deletion = is_null_sha1(new_sha1);
434                 if (ref->deletion && !allow_deleting_refs) {
435                         ref->status = REF_STATUS_REJECT_NODELETE;
436                         continue;
437                 }
438                 if (!ref->deletion &&
439                     !hashcmp(ref->old_sha1, new_sha1)) {
440                         ref->status = REF_STATUS_UPTODATE;
441                         continue;
442                 }
443
444                 /* This part determines what can overwrite what.
445                  * The rules are:
446                  *
447                  * (0) you can always use --force or +A:B notation to
448                  *     selectively force individual ref pairs.
449                  *
450                  * (1) if the old thing does not exist, it is OK.
451                  *
452                  * (2) if you do not have the old thing, you are not allowed
453                  *     to overwrite it; you would not know what you are losing
454                  *     otherwise.
455                  *
456                  * (3) if both new and old are commit-ish, and new is a
457                  *     descendant of old, it is OK.
458                  *
459                  * (4) regardless of all of the above, removing :B is
460                  *     always allowed.
461                  */
462
463                 ref->nonfastforward =
464                     !ref->deletion &&
465                     !is_null_sha1(ref->old_sha1) &&
466                     (!has_sha1_file(ref->old_sha1)
467                       || !ref_newer(new_sha1, ref->old_sha1));
468
469                 if (ref->nonfastforward && !ref->force && !args.force_update) {
470                         ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
471                         continue;
472                 }
473
474                 hashcpy(ref->new_sha1, new_sha1);
475                 if (!ref->deletion)
476                         new_refs++;
477
478                 if (!args.dry_run) {
479                         char *old_hex = sha1_to_hex(ref->old_sha1);
480                         char *new_hex = sha1_to_hex(ref->new_sha1);
481
482                         if (ask_for_status_report) {
483                                 packet_write(out, "%s %s %s%c%s",
484                                         old_hex, new_hex, ref->name, 0,
485                                         "report-status");
486                                 ask_for_status_report = 0;
487                                 expect_status_report = 1;
488                         }
489                         else
490                                 packet_write(out, "%s %s %s",
491                                         old_hex, new_hex, ref->name);
492                 }
493                 ref->status = expect_status_report ?
494                         REF_STATUS_EXPECTING_REPORT :
495                         REF_STATUS_OK;
496         }
497
498         packet_flush(out);
499         if (new_refs && !args.dry_run) {
500                 if (pack_objects(out, remote_refs) < 0)
501                         return -1;
502         }
503         else
504                 close(out);
505
506         if (expect_status_report)
507                 ret = receive_status(in, remote_refs);
508         else
509                 ret = 0;
510
511         print_push_status(dest, remote_refs);
512
513         if (!args.dry_run && remote) {
514                 for (ref = remote_refs; ref; ref = ref->next)
515                         update_tracking_ref(remote, ref);
516         }
517
518         if (!refs_pushed(remote_refs))
519                 fprintf(stderr, "Everything up-to-date\n");
520         if (ret < 0)
521                 return ret;
522         for (ref = remote_refs; ref; ref = ref->next) {
523                 switch (ref->status) {
524                 case REF_STATUS_NONE:
525                 case REF_STATUS_UPTODATE:
526                 case REF_STATUS_OK:
527                         break;
528                 default:
529                         return -1;
530                 }
531         }
532         return 0;
533 }
534
535 static void verify_remote_names(int nr_heads, const char **heads)
536 {
537         int i;
538
539         for (i = 0; i < nr_heads; i++) {
540                 const char *remote = strrchr(heads[i], ':');
541
542                 remote = remote ? (remote + 1) : heads[i];
543                 switch (check_ref_format(remote)) {
544                 case 0: /* ok */
545                 case CHECK_REF_FORMAT_ONELEVEL:
546                         /* ok but a single level -- that is fine for
547                          * a match pattern.
548                          */
549                 case CHECK_REF_FORMAT_WILDCARD:
550                         /* ok but ends with a pattern-match character */
551                         continue;
552                 }
553                 die("remote part of refspec is not a valid name in %s",
554                     heads[i]);
555         }
556 }
557
558 int cmd_send_pack(int argc, const char **argv, const char *prefix)
559 {
560         int i, nr_heads = 0;
561         const char **heads = NULL;
562         const char *remote_name = NULL;
563         struct remote *remote = NULL;
564         const char *dest = NULL;
565
566         argv++;
567         for (i = 1; i < argc; i++, argv++) {
568                 const char *arg = *argv;
569
570                 if (*arg == '-') {
571                         if (!prefixcmp(arg, "--receive-pack=")) {
572                                 args.receivepack = arg + 15;
573                                 continue;
574                         }
575                         if (!prefixcmp(arg, "--exec=")) {
576                                 args.receivepack = arg + 7;
577                                 continue;
578                         }
579                         if (!prefixcmp(arg, "--remote=")) {
580                                 remote_name = arg + 9;
581                                 continue;
582                         }
583                         if (!strcmp(arg, "--all")) {
584                                 args.send_all = 1;
585                                 continue;
586                         }
587                         if (!strcmp(arg, "--dry-run")) {
588                                 args.dry_run = 1;
589                                 continue;
590                         }
591                         if (!strcmp(arg, "--mirror")) {
592                                 args.send_mirror = 1;
593                                 continue;
594                         }
595                         if (!strcmp(arg, "--force")) {
596                                 args.force_update = 1;
597                                 continue;
598                         }
599                         if (!strcmp(arg, "--verbose")) {
600                                 args.verbose = 1;
601                                 continue;
602                         }
603                         if (!strcmp(arg, "--thin")) {
604                                 args.use_thin_pack = 1;
605                                 continue;
606                         }
607                         usage(send_pack_usage);
608                 }
609                 if (!dest) {
610                         dest = arg;
611                         continue;
612                 }
613                 heads = (const char **) argv;
614                 nr_heads = argc - i;
615                 break;
616         }
617         if (!dest)
618                 usage(send_pack_usage);
619         /*
620          * --all and --mirror are incompatible; neither makes sense
621          * with any refspecs.
622          */
623         if ((heads && (args.send_all || args.send_mirror)) ||
624                                         (args.send_all && args.send_mirror))
625                 usage(send_pack_usage);
626
627         if (remote_name) {
628                 remote = remote_get(remote_name);
629                 if (!remote_has_url(remote, dest)) {
630                         die("Destination %s is not a uri for %s",
631                             dest, remote_name);
632                 }
633         }
634
635         return send_pack(&args, dest, remote, nr_heads, heads);
636 }
637
638 int send_pack(struct send_pack_args *my_args,
639               const char *dest, struct remote *remote,
640               int nr_heads, const char **heads)
641 {
642         int fd[2], ret;
643         struct child_process *conn;
644
645         memcpy(&args, my_args, sizeof(args));
646
647         verify_remote_names(nr_heads, heads);
648
649         conn = git_connect(fd, dest, args.receivepack, args.verbose ? CONNECT_VERBOSE : 0);
650         ret = do_send_pack(fd[0], fd[1], remote, dest, nr_heads, heads);
651         close(fd[0]);
652         /* do_send_pack always closes fd[1] */
653         ret |= finish_connect(conn);
654         return !!ret;
655 }