Merge branch 'ef/checkout-empty' into maint
[git] / builtin / send-pack.c
1 #include "builtin.h"
2 #include "commit.h"
3 #include "refs.h"
4 #include "pkt-line.h"
5 #include "sideband.h"
6 #include "run-command.h"
7 #include "remote.h"
8 #include "send-pack.h"
9 #include "quote.h"
10 #include "transport.h"
11
12 static const char send_pack_usage[] =
13 "git send-pack [--all | --mirror] [--dry-run] [--force] [--receive-pack=<git-receive-pack>] [--verbose] [--thin] [<host>:]<directory> [<ref>...]\n"
14 "  --all and explicit <ref> specification are mutually exclusive.";
15
16 static struct send_pack_args args;
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, struct send_pack_args *args)
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-implied",
45                 "--revs",
46                 "--stdout",
47                 NULL,
48                 NULL,
49                 NULL,
50                 NULL,
51                 NULL,
52         };
53         struct child_process po;
54         int i;
55
56         i = 4;
57         if (args->use_thin_pack)
58                 argv[i++] = "--thin";
59         if (args->use_ofs_delta)
60                 argv[i++] = "--delta-base-offset";
61         if (args->quiet || !args->progress)
62                 argv[i++] = "-q";
63         if (args->progress)
64                 argv[i++] = "--progress";
65         memset(&po, 0, sizeof(po));
66         po.argv = argv;
67         po.in = -1;
68         po.out = args->stateless_rpc ? -1 : fd;
69         po.git_cmd = 1;
70         if (start_command(&po))
71                 die_errno("git pack-objects failed");
72
73         /*
74          * We feed the pack-objects we just spawned with revision
75          * parameters by writing to the pipe.
76          */
77         for (i = 0; i < extra->nr; i++)
78                 if (!feed_object(extra->array[i], po.in, 1))
79                         break;
80
81         while (refs) {
82                 if (!is_null_sha1(refs->old_sha1) &&
83                     !feed_object(refs->old_sha1, po.in, 1))
84                         break;
85                 if (!is_null_sha1(refs->new_sha1) &&
86                     !feed_object(refs->new_sha1, po.in, 0))
87                         break;
88                 refs = refs->next;
89         }
90
91         close(po.in);
92
93         if (args->stateless_rpc) {
94                 char *buf = xmalloc(LARGE_PACKET_MAX);
95                 while (1) {
96                         ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
97                         if (n <= 0)
98                                 break;
99                         send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
100                 }
101                 free(buf);
102                 close(po.out);
103                 po.out = -1;
104         }
105
106         if (finish_command(&po))
107                 return -1;
108         return 0;
109 }
110
111 static int receive_status(int in, struct ref *refs)
112 {
113         struct ref *hint;
114         char line[1000];
115         int ret = 0;
116         int len = packet_read_line(in, line, sizeof(line));
117         if (len < 10 || memcmp(line, "unpack ", 7))
118                 return error("did not receive remote status");
119         if (memcmp(line, "unpack ok\n", 10)) {
120                 char *p = line + strlen(line) - 1;
121                 if (*p == '\n')
122                         *p = '\0';
123                 error("unpack failed: %s", line + 7);
124                 ret = -1;
125         }
126         hint = NULL;
127         while (1) {
128                 char *refname;
129                 char *msg;
130                 len = packet_read_line(in, line, sizeof(line));
131                 if (!len)
132                         break;
133                 if (len < 3 ||
134                     (memcmp(line, "ok ", 3) && memcmp(line, "ng ", 3))) {
135                         fprintf(stderr, "protocol error: %s\n", line);
136                         ret = -1;
137                         break;
138                 }
139
140                 line[strlen(line)-1] = '\0';
141                 refname = line + 3;
142                 msg = strchr(refname, ' ');
143                 if (msg)
144                         *msg++ = '\0';
145
146                 /* first try searching at our hint, falling back to all refs */
147                 if (hint)
148                         hint = find_ref_by_name(hint, refname);
149                 if (!hint)
150                         hint = find_ref_by_name(refs, refname);
151                 if (!hint) {
152                         warning("remote reported status on unknown ref: %s",
153                                         refname);
154                         continue;
155                 }
156                 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
157                         warning("remote reported status on unexpected ref: %s",
158                                         refname);
159                         continue;
160                 }
161
162                 if (line[0] == 'o' && line[1] == 'k')
163                         hint->status = REF_STATUS_OK;
164                 else {
165                         hint->status = REF_STATUS_REMOTE_REJECT;
166                         ret = -1;
167                 }
168                 if (msg)
169                         hint->remote_status = xstrdup(msg);
170                 /* start our next search from the next ref */
171                 hint = hint->next;
172         }
173         return ret;
174 }
175
176 static void print_helper_status(struct ref *ref)
177 {
178         struct strbuf buf = STRBUF_INIT;
179
180         for (; ref; ref = ref->next) {
181                 const char *msg = NULL;
182                 const char *res;
183
184                 switch(ref->status) {
185                 case REF_STATUS_NONE:
186                         res = "error";
187                         msg = "no match";
188                         break;
189
190                 case REF_STATUS_OK:
191                         res = "ok";
192                         break;
193
194                 case REF_STATUS_UPTODATE:
195                         res = "ok";
196                         msg = "up to date";
197                         break;
198
199                 case REF_STATUS_REJECT_NONFASTFORWARD:
200                         res = "error";
201                         msg = "non-fast forward";
202                         break;
203
204                 case REF_STATUS_REJECT_NODELETE:
205                 case REF_STATUS_REMOTE_REJECT:
206                         res = "error";
207                         break;
208
209                 case REF_STATUS_EXPECTING_REPORT:
210                 default:
211                         continue;
212                 }
213
214                 strbuf_reset(&buf);
215                 strbuf_addf(&buf, "%s %s", res, ref->name);
216                 if (ref->remote_status)
217                         msg = ref->remote_status;
218                 if (msg) {
219                         strbuf_addch(&buf, ' ');
220                         quote_two_c_style(&buf, "", msg, 0);
221                 }
222                 strbuf_addch(&buf, '\n');
223
224                 safe_write(1, buf.buf, buf.len);
225         }
226         strbuf_release(&buf);
227 }
228
229 static int sideband_demux(int in, int out, void *data)
230 {
231         int *fd = data, ret;
232 #ifdef NO_PTHREADS
233         close(fd[1]);
234 #endif
235         ret = recv_sideband("send-pack", fd[0], out);
236         close(out);
237         return ret;
238 }
239
240 int send_pack(struct send_pack_args *args,
241               int fd[], struct child_process *conn,
242               struct ref *remote_refs,
243               struct extra_have_objects *extra_have)
244 {
245         int in = fd[0];
246         int out = fd[1];
247         struct strbuf req_buf = STRBUF_INIT;
248         struct ref *ref;
249         int new_refs;
250         int allow_deleting_refs = 0;
251         int status_report = 0;
252         int use_sideband = 0;
253         int quiet_supported = 0;
254         unsigned cmds_sent = 0;
255         int ret;
256         struct async demux;
257
258         /* Does the other end support the reporting? */
259         if (server_supports("report-status"))
260                 status_report = 1;
261         if (server_supports("delete-refs"))
262                 allow_deleting_refs = 1;
263         if (server_supports("ofs-delta"))
264                 args->use_ofs_delta = 1;
265         if (server_supports("side-band-64k"))
266                 use_sideband = 1;
267         if (server_supports("quiet"))
268                 quiet_supported = 1;
269
270         if (!remote_refs) {
271                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
272                         "Perhaps you should specify a branch such as 'master'.\n");
273                 return 0;
274         }
275
276         /*
277          * Finally, tell the other end!
278          */
279         new_refs = 0;
280         for (ref = remote_refs; ref; ref = ref->next) {
281                 if (!ref->peer_ref && !args->send_mirror)
282                         continue;
283
284                 /* Check for statuses set by set_ref_status_for_push() */
285                 switch (ref->status) {
286                 case REF_STATUS_REJECT_NONFASTFORWARD:
287                 case REF_STATUS_UPTODATE:
288                         continue;
289                 default:
290                         ; /* do nothing */
291                 }
292
293                 if (ref->deletion && !allow_deleting_refs) {
294                         ref->status = REF_STATUS_REJECT_NODELETE;
295                         continue;
296                 }
297
298                 if (!ref->deletion)
299                         new_refs++;
300
301                 if (args->dry_run) {
302                         ref->status = REF_STATUS_OK;
303                 } else {
304                         char *old_hex = sha1_to_hex(ref->old_sha1);
305                         char *new_hex = sha1_to_hex(ref->new_sha1);
306                         int quiet = quiet_supported && (args->quiet || !args->progress);
307
308                         if (!cmds_sent && (status_report || use_sideband || args->quiet)) {
309                                 packet_buf_write(&req_buf, "%s %s %s%c%s%s%s",
310                                                  old_hex, new_hex, ref->name, 0,
311                                                  status_report ? " report-status" : "",
312                                                  use_sideband ? " side-band-64k" : "",
313                                                  quiet ? " quiet" : "");
314                         }
315                         else
316                                 packet_buf_write(&req_buf, "%s %s %s",
317                                                  old_hex, new_hex, ref->name);
318                         ref->status = status_report ?
319                                 REF_STATUS_EXPECTING_REPORT :
320                                 REF_STATUS_OK;
321                         cmds_sent++;
322                 }
323         }
324
325         if (args->stateless_rpc) {
326                 if (!args->dry_run && cmds_sent) {
327                         packet_buf_flush(&req_buf);
328                         send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
329                 }
330         } else {
331                 safe_write(out, req_buf.buf, req_buf.len);
332                 packet_flush(out);
333         }
334         strbuf_release(&req_buf);
335
336         if (use_sideband && cmds_sent) {
337                 memset(&demux, 0, sizeof(demux));
338                 demux.proc = sideband_demux;
339                 demux.data = fd;
340                 demux.out = -1;
341                 if (start_async(&demux))
342                         die("send-pack: unable to fork off sideband demultiplexer");
343                 in = demux.out;
344         }
345
346         if (new_refs && cmds_sent) {
347                 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
348                         for (ref = remote_refs; ref; ref = ref->next)
349                                 ref->status = REF_STATUS_NONE;
350                         if (args->stateless_rpc)
351                                 close(out);
352                         if (git_connection_is_socket(conn))
353                                 shutdown(fd[0], SHUT_WR);
354                         if (use_sideband)
355                                 finish_async(&demux);
356                         return -1;
357                 }
358         }
359         if (args->stateless_rpc && cmds_sent)
360                 packet_flush(out);
361
362         if (status_report && cmds_sent)
363                 ret = receive_status(in, remote_refs);
364         else
365                 ret = 0;
366         if (args->stateless_rpc)
367                 packet_flush(out);
368
369         if (use_sideband && cmds_sent) {
370                 if (finish_async(&demux)) {
371                         error("error in sideband demultiplexer");
372                         ret = -1;
373                 }
374                 close(demux.out);
375         }
376
377         if (ret < 0)
378                 return ret;
379
380         if (args->porcelain)
381                 return 0;
382
383         for (ref = remote_refs; ref; ref = ref->next) {
384                 switch (ref->status) {
385                 case REF_STATUS_NONE:
386                 case REF_STATUS_UPTODATE:
387                 case REF_STATUS_OK:
388                         break;
389                 default:
390                         return -1;
391                 }
392         }
393         return 0;
394 }
395
396 int cmd_send_pack(int argc, const char **argv, const char *prefix)
397 {
398         int i, nr_refspecs = 0;
399         const char **refspecs = NULL;
400         const char *remote_name = NULL;
401         struct remote *remote = NULL;
402         const char *dest = NULL;
403         int fd[2];
404         struct child_process *conn;
405         struct extra_have_objects extra_have;
406         struct ref *remote_refs, *local_refs;
407         int ret;
408         int helper_status = 0;
409         int send_all = 0;
410         const char *receivepack = "git-receive-pack";
411         int flags;
412         int nonfastforward = 0;
413         int progress = -1;
414
415         argv++;
416         for (i = 1; i < argc; i++, argv++) {
417                 const char *arg = *argv;
418
419                 if (*arg == '-') {
420                         if (!prefixcmp(arg, "--receive-pack=")) {
421                                 receivepack = arg + 15;
422                                 continue;
423                         }
424                         if (!prefixcmp(arg, "--exec=")) {
425                                 receivepack = arg + 7;
426                                 continue;
427                         }
428                         if (!prefixcmp(arg, "--remote=")) {
429                                 remote_name = arg + 9;
430                                 continue;
431                         }
432                         if (!strcmp(arg, "--all")) {
433                                 send_all = 1;
434                                 continue;
435                         }
436                         if (!strcmp(arg, "--dry-run")) {
437                                 args.dry_run = 1;
438                                 continue;
439                         }
440                         if (!strcmp(arg, "--mirror")) {
441                                 args.send_mirror = 1;
442                                 continue;
443                         }
444                         if (!strcmp(arg, "--force")) {
445                                 args.force_update = 1;
446                                 continue;
447                         }
448                         if (!strcmp(arg, "--quiet")) {
449                                 args.quiet = 1;
450                                 continue;
451                         }
452                         if (!strcmp(arg, "--verbose")) {
453                                 args.verbose = 1;
454                                 continue;
455                         }
456                         if (!strcmp(arg, "--progress")) {
457                                 progress = 1;
458                                 continue;
459                         }
460                         if (!strcmp(arg, "--no-progress")) {
461                                 progress = 0;
462                                 continue;
463                         }
464                         if (!strcmp(arg, "--thin")) {
465                                 args.use_thin_pack = 1;
466                                 continue;
467                         }
468                         if (!strcmp(arg, "--stateless-rpc")) {
469                                 args.stateless_rpc = 1;
470                                 continue;
471                         }
472                         if (!strcmp(arg, "--helper-status")) {
473                                 helper_status = 1;
474                                 continue;
475                         }
476                         usage(send_pack_usage);
477                 }
478                 if (!dest) {
479                         dest = arg;
480                         continue;
481                 }
482                 refspecs = (const char **) argv;
483                 nr_refspecs = argc - i;
484                 break;
485         }
486         if (!dest)
487                 usage(send_pack_usage);
488         /*
489          * --all and --mirror are incompatible; neither makes sense
490          * with any refspecs.
491          */
492         if ((refspecs && (send_all || args.send_mirror)) ||
493             (send_all && args.send_mirror))
494                 usage(send_pack_usage);
495
496         if (remote_name) {
497                 remote = remote_get(remote_name);
498                 if (!remote_has_url(remote, dest)) {
499                         die("Destination %s is not a uri for %s",
500                             dest, remote_name);
501                 }
502         }
503
504         if (progress == -1)
505                 progress = !args.quiet && isatty(2);
506         args.progress = progress;
507
508         if (args.stateless_rpc) {
509                 conn = NULL;
510                 fd[0] = 0;
511                 fd[1] = 1;
512         } else {
513                 conn = git_connect(fd, dest, receivepack,
514                         args.verbose ? CONNECT_VERBOSE : 0);
515         }
516
517         memset(&extra_have, 0, sizeof(extra_have));
518
519         get_remote_heads(fd[0], &remote_refs, REF_NORMAL, &extra_have);
520
521         transport_verify_remote_names(nr_refspecs, refspecs);
522
523         local_refs = get_local_heads();
524
525         flags = MATCH_REFS_NONE;
526
527         if (send_all)
528                 flags |= MATCH_REFS_ALL;
529         if (args.send_mirror)
530                 flags |= MATCH_REFS_MIRROR;
531
532         /* match them up */
533         if (match_push_refs(local_refs, &remote_refs, nr_refspecs, refspecs, flags))
534                 return -1;
535
536         set_ref_status_for_push(remote_refs, args.send_mirror,
537                 args.force_update);
538
539         ret = send_pack(&args, fd, conn, remote_refs, &extra_have);
540
541         if (helper_status)
542                 print_helper_status(remote_refs);
543
544         close(fd[1]);
545         close(fd[0]);
546
547         ret |= finish_connect(conn);
548
549         if (!helper_status)
550                 transport_print_push_status(dest, remote_refs, args.verbose, 0, &nonfastforward);
551
552         if (!args.dry_run && remote) {
553                 struct ref *ref;
554                 for (ref = remote_refs; ref; ref = ref->next)
555                         transport_update_tracking_ref(remote, ref, args.verbose);
556         }
557
558         if (!ret && !transport_refs_pushed(remote_refs))
559                 fprintf(stderr, "Everything up-to-date\n");
560
561         return ret;
562 }