Merge branch 'js/fsck-tag-validation' into HEAD
[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
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 sha1_array *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-implied",
42                 "--revs",
43                 "--stdout",
44                 NULL,
45                 NULL,
46                 NULL,
47                 NULL,
48                 NULL,
49         };
50         struct child_process po = CHILD_PROCESS_INIT;
51         int i;
52
53         i = 4;
54         if (args->use_thin_pack)
55                 argv[i++] = "--thin";
56         if (args->use_ofs_delta)
57                 argv[i++] = "--delta-base-offset";
58         if (args->quiet || !args->progress)
59                 argv[i++] = "-q";
60         if (args->progress)
61                 argv[i++] = "--progress";
62         po.argv = argv;
63         po.in = -1;
64         po.out = args->stateless_rpc ? -1 : fd;
65         po.git_cmd = 1;
66         if (start_command(&po))
67                 die_errno("git pack-objects failed");
68
69         /*
70          * We feed the pack-objects we just spawned with revision
71          * parameters by writing to the pipe.
72          */
73         for (i = 0; i < extra->nr; i++)
74                 if (!feed_object(extra->sha1[i], po.in, 1))
75                         break;
76
77         while (refs) {
78                 if (!is_null_sha1(refs->old_sha1) &&
79                     !feed_object(refs->old_sha1, po.in, 1))
80                         break;
81                 if (!is_null_sha1(refs->new_sha1) &&
82                     !feed_object(refs->new_sha1, po.in, 0))
83                         break;
84                 refs = refs->next;
85         }
86
87         close(po.in);
88
89         if (args->stateless_rpc) {
90                 char *buf = xmalloc(LARGE_PACKET_MAX);
91                 while (1) {
92                         ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
93                         if (n <= 0)
94                                 break;
95                         send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
96                 }
97                 free(buf);
98                 close(po.out);
99                 po.out = -1;
100         }
101
102         if (finish_command(&po))
103                 return -1;
104         return 0;
105 }
106
107 static int receive_status(int in, struct ref *refs)
108 {
109         struct ref *hint;
110         int ret = 0;
111         char *line = packet_read_line(in, NULL);
112         if (!starts_with(line, "unpack "))
113                 return error("did not receive remote status");
114         if (strcmp(line, "unpack ok")) {
115                 error("unpack failed: %s", line + 7);
116                 ret = -1;
117         }
118         hint = NULL;
119         while (1) {
120                 char *refname;
121                 char *msg;
122                 line = packet_read_line(in, NULL);
123                 if (!line)
124                         break;
125                 if (!starts_with(line, "ok ") && !starts_with(line, "ng ")) {
126                         error("invalid ref status from remote: %s", line);
127                         ret = -1;
128                         break;
129                 }
130
131                 refname = line + 3;
132                 msg = strchr(refname, ' ');
133                 if (msg)
134                         *msg++ = '\0';
135
136                 /* first try searching at our hint, falling back to all refs */
137                 if (hint)
138                         hint = find_ref_by_name(hint, refname);
139                 if (!hint)
140                         hint = find_ref_by_name(refs, refname);
141                 if (!hint) {
142                         warning("remote reported status on unknown ref: %s",
143                                         refname);
144                         continue;
145                 }
146                 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
147                         warning("remote reported status on unexpected ref: %s",
148                                         refname);
149                         continue;
150                 }
151
152                 if (line[0] == 'o' && line[1] == 'k')
153                         hint->status = REF_STATUS_OK;
154                 else {
155                         hint->status = REF_STATUS_REMOTE_REJECT;
156                         ret = -1;
157                 }
158                 if (msg)
159                         hint->remote_status = xstrdup(msg);
160                 /* start our next search from the next ref */
161                 hint = hint->next;
162         }
163         return ret;
164 }
165
166 static int sideband_demux(int in, int out, void *data)
167 {
168         int *fd = data, ret;
169 #ifdef NO_PTHREADS
170         close(fd[1]);
171 #endif
172         ret = recv_sideband("send-pack", fd[0], out);
173         close(out);
174         return ret;
175 }
176
177 static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
178 {
179         struct strbuf *sb = cb;
180         if (graft->nr_parent == -1)
181                 packet_buf_write(sb, "shallow %s\n", sha1_to_hex(graft->sha1));
182         return 0;
183 }
184
185 static void advertise_shallow_grafts_buf(struct strbuf *sb)
186 {
187         if (!is_repository_shallow())
188                 return;
189         for_each_commit_graft(advertise_shallow_grafts_cb, sb);
190 }
191
192 int send_pack(struct send_pack_args *args,
193               int fd[], struct child_process *conn,
194               struct ref *remote_refs,
195               struct sha1_array *extra_have)
196 {
197         int in = fd[0];
198         int out = fd[1];
199         struct strbuf req_buf = STRBUF_INIT;
200         struct ref *ref;
201         int new_refs;
202         int allow_deleting_refs = 0;
203         int status_report = 0;
204         int use_sideband = 0;
205         int quiet_supported = 0;
206         int agent_supported = 0;
207         unsigned cmds_sent = 0;
208         int ret;
209         struct async demux;
210
211         /* Does the other end support the reporting? */
212         if (server_supports("report-status"))
213                 status_report = 1;
214         if (server_supports("delete-refs"))
215                 allow_deleting_refs = 1;
216         if (server_supports("ofs-delta"))
217                 args->use_ofs_delta = 1;
218         if (server_supports("side-band-64k"))
219                 use_sideband = 1;
220         if (server_supports("quiet"))
221                 quiet_supported = 1;
222         if (server_supports("agent"))
223                 agent_supported = 1;
224         if (server_supports("no-thin"))
225                 args->use_thin_pack = 0;
226
227         if (!remote_refs) {
228                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
229                         "Perhaps you should specify a branch such as 'master'.\n");
230                 return 0;
231         }
232
233         if (!args->dry_run)
234                 advertise_shallow_grafts_buf(&req_buf);
235
236         /*
237          * Finally, tell the other end!
238          */
239         new_refs = 0;
240         for (ref = remote_refs; ref; ref = ref->next) {
241                 if (!ref->peer_ref && !args->send_mirror)
242                         continue;
243
244                 /* Check for statuses set by set_ref_status_for_push() */
245                 switch (ref->status) {
246                 case REF_STATUS_REJECT_NONFASTFORWARD:
247                 case REF_STATUS_REJECT_ALREADY_EXISTS:
248                 case REF_STATUS_REJECT_FETCH_FIRST:
249                 case REF_STATUS_REJECT_NEEDS_FORCE:
250                 case REF_STATUS_REJECT_STALE:
251                 case REF_STATUS_UPTODATE:
252                         continue;
253                 default:
254                         ; /* do nothing */
255                 }
256
257                 if (ref->deletion && !allow_deleting_refs) {
258                         ref->status = REF_STATUS_REJECT_NODELETE;
259                         continue;
260                 }
261
262                 if (!ref->deletion)
263                         new_refs++;
264
265                 if (args->dry_run) {
266                         ref->status = REF_STATUS_OK;
267                 } else {
268                         char *old_hex = sha1_to_hex(ref->old_sha1);
269                         char *new_hex = sha1_to_hex(ref->new_sha1);
270                         int quiet = quiet_supported && (args->quiet || !args->progress);
271
272                         if (!cmds_sent && (status_report || use_sideband ||
273                                            quiet || agent_supported)) {
274                                 packet_buf_write(&req_buf,
275                                                  "%s %s %s%c%s%s%s%s%s",
276                                                  old_hex, new_hex, ref->name, 0,
277                                                  status_report ? " report-status" : "",
278                                                  use_sideband ? " side-band-64k" : "",
279                                                  quiet ? " quiet" : "",
280                                                  agent_supported ? " agent=" : "",
281                                                  agent_supported ? git_user_agent_sanitized() : ""
282                                                 );
283                         }
284                         else
285                                 packet_buf_write(&req_buf, "%s %s %s",
286                                                  old_hex, new_hex, ref->name);
287                         ref->status = status_report ?
288                                 REF_STATUS_EXPECTING_REPORT :
289                                 REF_STATUS_OK;
290                         cmds_sent++;
291                 }
292         }
293
294         if (args->stateless_rpc) {
295                 if (!args->dry_run && (cmds_sent || is_repository_shallow())) {
296                         packet_buf_flush(&req_buf);
297                         send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
298                 }
299         } else {
300                 write_or_die(out, req_buf.buf, req_buf.len);
301                 packet_flush(out);
302         }
303         strbuf_release(&req_buf);
304
305         if (use_sideband && cmds_sent) {
306                 memset(&demux, 0, sizeof(demux));
307                 demux.proc = sideband_demux;
308                 demux.data = fd;
309                 demux.out = -1;
310                 if (start_async(&demux))
311                         die("send-pack: unable to fork off sideband demultiplexer");
312                 in = demux.out;
313         }
314
315         if (new_refs && cmds_sent) {
316                 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
317                         for (ref = remote_refs; ref; ref = ref->next)
318                                 ref->status = REF_STATUS_NONE;
319                         if (args->stateless_rpc)
320                                 close(out);
321                         if (git_connection_is_socket(conn))
322                                 shutdown(fd[0], SHUT_WR);
323                         if (use_sideband)
324                                 finish_async(&demux);
325                         fd[1] = -1;
326                         return -1;
327                 }
328                 if (!args->stateless_rpc)
329                         /* Closed by pack_objects() via start_command() */
330                         fd[1] = -1;
331         }
332         if (args->stateless_rpc && cmds_sent)
333                 packet_flush(out);
334
335         if (status_report && cmds_sent)
336                 ret = receive_status(in, remote_refs);
337         else
338                 ret = 0;
339         if (args->stateless_rpc)
340                 packet_flush(out);
341
342         if (use_sideband && cmds_sent) {
343                 if (finish_async(&demux)) {
344                         error("error in sideband demultiplexer");
345                         ret = -1;
346                 }
347                 close(demux.out);
348         }
349
350         if (ret < 0)
351                 return ret;
352
353         if (args->porcelain)
354                 return 0;
355
356         for (ref = remote_refs; ref; ref = ref->next) {
357                 switch (ref->status) {
358                 case REF_STATUS_NONE:
359                 case REF_STATUS_UPTODATE:
360                 case REF_STATUS_OK:
361                         break;
362                 default:
363                         return -1;
364                 }
365         }
366         return 0;
367 }