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