Merge branch 'po/doc-assume-unchanged'
[git] / 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 "connect.h"
9 #include "send-pack.h"
10 #include "quote.h"
11 #include "transport.h"
12 #include "version.h"
13 #include "sha1-array.h"
14 #include "gpg-interface.h"
15
16 static int feed_object(const unsigned char *sha1, int fd, int negative)
17 {
18         char buf[42];
19
20         if (negative && !has_sha1_file(sha1))
21                 return 1;
22
23         memcpy(buf + negative, sha1_to_hex(sha1), 40);
24         if (negative)
25                 buf[0] = '^';
26         buf[40 + negative] = '\n';
27         return write_or_whine(fd, buf, 41 + negative, "send-pack: send refs");
28 }
29
30 /*
31  * Make a pack stream and spit it out into file descriptor fd
32  */
33 static int pack_objects(int fd, struct ref *refs, struct sha1_array *extra, struct send_pack_args *args)
34 {
35         /*
36          * The child becomes pack-objects --revs; we feed
37          * the revision parameters to it via its stdin and
38          * let its stdout go back to the other end.
39          */
40         const char *argv[] = {
41                 "pack-objects",
42                 "--all-progress-implied",
43                 "--revs",
44                 "--stdout",
45                 NULL,
46                 NULL,
47                 NULL,
48                 NULL,
49                 NULL,
50         };
51         struct child_process po = CHILD_PROCESS_INIT;
52         int i;
53
54         i = 4;
55         if (args->use_thin_pack)
56                 argv[i++] = "--thin";
57         if (args->use_ofs_delta)
58                 argv[i++] = "--delta-base-offset";
59         if (args->quiet || !args->progress)
60                 argv[i++] = "-q";
61         if (args->progress)
62                 argv[i++] = "--progress";
63         po.argv = argv;
64         po.in = -1;
65         po.out = args->stateless_rpc ? -1 : fd;
66         po.git_cmd = 1;
67         if (start_command(&po))
68                 die_errno("git pack-objects failed");
69
70         /*
71          * We feed the pack-objects we just spawned with revision
72          * parameters by writing to the pipe.
73          */
74         for (i = 0; i < extra->nr; i++)
75                 if (!feed_object(extra->sha1[i], po.in, 1))
76                         break;
77
78         while (refs) {
79                 if (!is_null_sha1(refs->old_sha1) &&
80                     !feed_object(refs->old_sha1, po.in, 1))
81                         break;
82                 if (!is_null_sha1(refs->new_sha1) &&
83                     !feed_object(refs->new_sha1, po.in, 0))
84                         break;
85                 refs = refs->next;
86         }
87
88         close(po.in);
89
90         if (args->stateless_rpc) {
91                 char *buf = xmalloc(LARGE_PACKET_MAX);
92                 while (1) {
93                         ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
94                         if (n <= 0)
95                                 break;
96                         send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
97                 }
98                 free(buf);
99                 close(po.out);
100                 po.out = -1;
101         }
102
103         if (finish_command(&po))
104                 return -1;
105         return 0;
106 }
107
108 static int receive_status(int in, struct ref *refs)
109 {
110         struct ref *hint;
111         int ret = 0;
112         char *line = packet_read_line(in, NULL);
113         if (!starts_with(line, "unpack "))
114                 return error("did not receive remote status");
115         if (strcmp(line, "unpack ok")) {
116                 error("unpack failed: %s", line + 7);
117                 ret = -1;
118         }
119         hint = NULL;
120         while (1) {
121                 char *refname;
122                 char *msg;
123                 line = packet_read_line(in, NULL);
124                 if (!line)
125                         break;
126                 if (!starts_with(line, "ok ") && !starts_with(line, "ng ")) {
127                         error("invalid ref status from remote: %s", line);
128                         ret = -1;
129                         break;
130                 }
131
132                 refname = line + 3;
133                 msg = strchr(refname, ' ');
134                 if (msg)
135                         *msg++ = '\0';
136
137                 /* first try searching at our hint, falling back to all refs */
138                 if (hint)
139                         hint = find_ref_by_name(hint, refname);
140                 if (!hint)
141                         hint = find_ref_by_name(refs, refname);
142                 if (!hint) {
143                         warning("remote reported status on unknown ref: %s",
144                                         refname);
145                         continue;
146                 }
147                 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
148                         warning("remote reported status on unexpected ref: %s",
149                                         refname);
150                         continue;
151                 }
152
153                 if (line[0] == 'o' && line[1] == 'k')
154                         hint->status = REF_STATUS_OK;
155                 else {
156                         hint->status = REF_STATUS_REMOTE_REJECT;
157                         ret = -1;
158                 }
159                 if (msg)
160                         hint->remote_status = xstrdup(msg);
161                 /* start our next search from the next ref */
162                 hint = hint->next;
163         }
164         return ret;
165 }
166
167 static int sideband_demux(int in, int out, void *data)
168 {
169         int *fd = data, ret;
170 #ifdef NO_PTHREADS
171         close(fd[1]);
172 #endif
173         ret = recv_sideband("send-pack", fd[0], out);
174         close(out);
175         return ret;
176 }
177
178 static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
179 {
180         struct strbuf *sb = cb;
181         if (graft->nr_parent == -1)
182                 packet_buf_write(sb, "shallow %s\n", sha1_to_hex(graft->sha1));
183         return 0;
184 }
185
186 static void advertise_shallow_grafts_buf(struct strbuf *sb)
187 {
188         if (!is_repository_shallow())
189                 return;
190         for_each_commit_graft(advertise_shallow_grafts_cb, sb);
191 }
192
193 static int ref_update_to_be_sent(const struct ref *ref, const struct send_pack_args *args)
194 {
195         if (!ref->peer_ref && !args->send_mirror)
196                 return 0;
197
198         /* Check for statuses set by set_ref_status_for_push() */
199         switch (ref->status) {
200         case REF_STATUS_REJECT_NONFASTFORWARD:
201         case REF_STATUS_REJECT_ALREADY_EXISTS:
202         case REF_STATUS_REJECT_FETCH_FIRST:
203         case REF_STATUS_REJECT_NEEDS_FORCE:
204         case REF_STATUS_REJECT_STALE:
205         case REF_STATUS_REJECT_NODELETE:
206         case REF_STATUS_UPTODATE:
207                 return 0;
208         default:
209                 return 1;
210         }
211 }
212
213 /*
214  * the beginning of the next line, or the end of buffer.
215  *
216  * NEEDSWORK: perhaps move this to git-compat-util.h or somewhere and
217  * convert many similar uses found by "git grep -A4 memchr".
218  */
219 static const char *next_line(const char *line, size_t len)
220 {
221         const char *nl = memchr(line, '\n', len);
222         if (!nl)
223                 return line + len; /* incomplete line */
224         return nl + 1;
225 }
226
227 static int generate_push_cert(struct strbuf *req_buf,
228                               const struct ref *remote_refs,
229                               struct send_pack_args *args,
230                               const char *cap_string,
231                               const char *push_cert_nonce)
232 {
233         const struct ref *ref;
234         char *signing_key = xstrdup(get_signing_key());
235         const char *cp, *np;
236         struct strbuf cert = STRBUF_INIT;
237         int update_seen = 0;
238
239         strbuf_addf(&cert, "certificate version 0.1\n");
240         strbuf_addf(&cert, "pusher %s ", signing_key);
241         datestamp(&cert);
242         strbuf_addch(&cert, '\n');
243         if (args->url && *args->url) {
244                 char *anon_url = transport_anonymize_url(args->url);
245                 strbuf_addf(&cert, "pushee %s\n", anon_url);
246                 free(anon_url);
247         }
248         if (push_cert_nonce[0])
249                 strbuf_addf(&cert, "nonce %s\n", push_cert_nonce);
250         strbuf_addstr(&cert, "\n");
251
252         for (ref = remote_refs; ref; ref = ref->next) {
253                 if (!ref_update_to_be_sent(ref, args))
254                         continue;
255                 update_seen = 1;
256                 strbuf_addf(&cert, "%s %s %s\n",
257                             sha1_to_hex(ref->old_sha1),
258                             sha1_to_hex(ref->new_sha1),
259                             ref->name);
260         }
261         if (!update_seen)
262                 goto free_return;
263
264         if (sign_buffer(&cert, &cert, signing_key))
265                 die(_("failed to sign the push certificate"));
266
267         packet_buf_write(req_buf, "push-cert%c%s", 0, cap_string);
268         for (cp = cert.buf; cp < cert.buf + cert.len; cp = np) {
269                 np = next_line(cp, cert.buf + cert.len - cp);
270                 packet_buf_write(req_buf,
271                                  "%.*s", (int)(np - cp), cp);
272         }
273         packet_buf_write(req_buf, "push-cert-end\n");
274
275 free_return:
276         free(signing_key);
277         strbuf_release(&cert);
278         return update_seen;
279 }
280
281 int send_pack(struct send_pack_args *args,
282               int fd[], struct child_process *conn,
283               struct ref *remote_refs,
284               struct sha1_array *extra_have)
285 {
286         int in = fd[0];
287         int out = fd[1];
288         struct strbuf req_buf = STRBUF_INIT;
289         struct strbuf cap_buf = STRBUF_INIT;
290         struct ref *ref;
291         int need_pack_data = 0;
292         int allow_deleting_refs = 0;
293         int status_report = 0;
294         int use_sideband = 0;
295         int quiet_supported = 0;
296         int agent_supported = 0;
297         unsigned cmds_sent = 0;
298         int ret;
299         struct async demux;
300         const char *push_cert_nonce = NULL;
301
302         /* Does the other end support the reporting? */
303         if (server_supports("report-status"))
304                 status_report = 1;
305         if (server_supports("delete-refs"))
306                 allow_deleting_refs = 1;
307         if (server_supports("ofs-delta"))
308                 args->use_ofs_delta = 1;
309         if (server_supports("side-band-64k"))
310                 use_sideband = 1;
311         if (server_supports("quiet"))
312                 quiet_supported = 1;
313         if (server_supports("agent"))
314                 agent_supported = 1;
315         if (server_supports("no-thin"))
316                 args->use_thin_pack = 0;
317         if (args->push_cert) {
318                 int len;
319
320                 push_cert_nonce = server_feature_value("push-cert", &len);
321                 if (!push_cert_nonce)
322                         die(_("the receiving end does not support --signed push"));
323                 push_cert_nonce = xmemdupz(push_cert_nonce, len);
324         }
325
326         if (!remote_refs) {
327                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
328                         "Perhaps you should specify a branch such as 'master'.\n");
329                 return 0;
330         }
331
332         if (status_report)
333                 strbuf_addstr(&cap_buf, " report-status");
334         if (use_sideband)
335                 strbuf_addstr(&cap_buf, " side-band-64k");
336         if (quiet_supported && (args->quiet || !args->progress))
337                 strbuf_addstr(&cap_buf, " quiet");
338         if (agent_supported)
339                 strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
340
341         /*
342          * NEEDSWORK: why does delete-refs have to be so specific to
343          * send-pack machinery that set_ref_status_for_push() cannot
344          * set this bit for us???
345          */
346         for (ref = remote_refs; ref; ref = ref->next)
347                 if (ref->deletion && !allow_deleting_refs)
348                         ref->status = REF_STATUS_REJECT_NODELETE;
349
350         if (!args->dry_run)
351                 advertise_shallow_grafts_buf(&req_buf);
352
353         if (!args->dry_run && args->push_cert)
354                 cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
355                                                cap_buf.buf, push_cert_nonce);
356
357         /*
358          * Clear the status for each ref and see if we need to send
359          * the pack data.
360          */
361         for (ref = remote_refs; ref; ref = ref->next) {
362                 if (!ref_update_to_be_sent(ref, args))
363                         continue;
364
365                 if (!ref->deletion)
366                         need_pack_data = 1;
367
368                 if (args->dry_run || !status_report)
369                         ref->status = REF_STATUS_OK;
370                 else
371                         ref->status = REF_STATUS_EXPECTING_REPORT;
372         }
373
374         /*
375          * Finally, tell the other end!
376          */
377         for (ref = remote_refs; ref; ref = ref->next) {
378                 char *old_hex, *new_hex;
379
380                 if (args->dry_run || args->push_cert)
381                         continue;
382
383                 if (!ref_update_to_be_sent(ref, args))
384                         continue;
385
386                 old_hex = sha1_to_hex(ref->old_sha1);
387                 new_hex = sha1_to_hex(ref->new_sha1);
388                 if (!cmds_sent) {
389                         packet_buf_write(&req_buf,
390                                          "%s %s %s%c%s",
391                                          old_hex, new_hex, ref->name, 0,
392                                          cap_buf.buf);
393                         cmds_sent = 1;
394                 } else {
395                         packet_buf_write(&req_buf, "%s %s %s",
396                                          old_hex, new_hex, ref->name);
397                 }
398         }
399
400         if (args->stateless_rpc) {
401                 if (!args->dry_run && (cmds_sent || is_repository_shallow())) {
402                         packet_buf_flush(&req_buf);
403                         send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
404                 }
405         } else {
406                 write_or_die(out, req_buf.buf, req_buf.len);
407                 packet_flush(out);
408         }
409         strbuf_release(&req_buf);
410         strbuf_release(&cap_buf);
411
412         if (use_sideband && cmds_sent) {
413                 memset(&demux, 0, sizeof(demux));
414                 demux.proc = sideband_demux;
415                 demux.data = fd;
416                 demux.out = -1;
417                 if (start_async(&demux))
418                         die("send-pack: unable to fork off sideband demultiplexer");
419                 in = demux.out;
420         }
421
422         if (need_pack_data && cmds_sent) {
423                 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
424                         for (ref = remote_refs; ref; ref = ref->next)
425                                 ref->status = REF_STATUS_NONE;
426                         if (args->stateless_rpc)
427                                 close(out);
428                         if (git_connection_is_socket(conn))
429                                 shutdown(fd[0], SHUT_WR);
430                         if (use_sideband)
431                                 finish_async(&demux);
432                         fd[1] = -1;
433                         return -1;
434                 }
435                 if (!args->stateless_rpc)
436                         /* Closed by pack_objects() via start_command() */
437                         fd[1] = -1;
438         }
439         if (args->stateless_rpc && cmds_sent)
440                 packet_flush(out);
441
442         if (status_report && cmds_sent)
443                 ret = receive_status(in, remote_refs);
444         else
445                 ret = 0;
446         if (args->stateless_rpc)
447                 packet_flush(out);
448
449         if (use_sideband && cmds_sent) {
450                 if (finish_async(&demux)) {
451                         error("error in sideband demultiplexer");
452                         ret = -1;
453                 }
454                 close(demux.out);
455         }
456
457         if (ret < 0)
458                 return ret;
459
460         if (args->porcelain)
461                 return 0;
462
463         for (ref = remote_refs; ref; ref = ref->next) {
464                 switch (ref->status) {
465                 case REF_STATUS_NONE:
466                 case REF_STATUS_UPTODATE:
467                 case REF_STATUS_OK:
468                         break;
469                 default:
470                         return -1;
471                 }
472         }
473         return 0;
474 }