Merge branch 'jk/command-line-config-empty-string'
[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;
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         memset(&po, 0, sizeof(po));
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 int send_pack(struct send_pack_args *args,
194               int fd[], struct child_process *conn,
195               struct ref *remote_refs,
196               struct sha1_array *extra_have)
197 {
198         int in = fd[0];
199         int out = fd[1];
200         struct strbuf req_buf = STRBUF_INIT;
201         struct ref *ref;
202         int new_refs;
203         int allow_deleting_refs = 0;
204         int status_report = 0;
205         int use_sideband = 0;
206         int quiet_supported = 0;
207         int agent_supported = 0;
208         unsigned cmds_sent = 0;
209         int ret;
210         struct async demux;
211
212         /* Does the other end support the reporting? */
213         if (server_supports("report-status"))
214                 status_report = 1;
215         if (server_supports("delete-refs"))
216                 allow_deleting_refs = 1;
217         if (server_supports("ofs-delta"))
218                 args->use_ofs_delta = 1;
219         if (server_supports("side-band-64k"))
220                 use_sideband = 1;
221         if (server_supports("quiet"))
222                 quiet_supported = 1;
223         if (server_supports("agent"))
224                 agent_supported = 1;
225         if (server_supports("no-thin"))
226                 args->use_thin_pack = 0;
227
228         if (!remote_refs) {
229                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
230                         "Perhaps you should specify a branch such as 'master'.\n");
231                 return 0;
232         }
233
234         if (!args->dry_run)
235                 advertise_shallow_grafts_buf(&req_buf);
236
237         /*
238          * Finally, tell the other end!
239          */
240         new_refs = 0;
241         for (ref = remote_refs; ref; ref = ref->next) {
242                 if (!ref->peer_ref && !args->send_mirror)
243                         continue;
244
245                 /* Check for statuses set by set_ref_status_for_push() */
246                 switch (ref->status) {
247                 case REF_STATUS_REJECT_NONFASTFORWARD:
248                 case REF_STATUS_REJECT_ALREADY_EXISTS:
249                 case REF_STATUS_REJECT_FETCH_FIRST:
250                 case REF_STATUS_REJECT_NEEDS_FORCE:
251                 case REF_STATUS_REJECT_STALE:
252                 case REF_STATUS_UPTODATE:
253                         continue;
254                 default:
255                         ; /* do nothing */
256                 }
257
258                 if (ref->deletion && !allow_deleting_refs) {
259                         ref->status = REF_STATUS_REJECT_NODELETE;
260                         continue;
261                 }
262
263                 if (!ref->deletion)
264                         new_refs++;
265
266                 if (args->dry_run) {
267                         ref->status = REF_STATUS_OK;
268                 } else {
269                         char *old_hex = sha1_to_hex(ref->old_sha1);
270                         char *new_hex = sha1_to_hex(ref->new_sha1);
271                         int quiet = quiet_supported && (args->quiet || !args->progress);
272
273                         if (!cmds_sent && (status_report || use_sideband ||
274                                            quiet || agent_supported)) {
275                                 packet_buf_write(&req_buf,
276                                                  "%s %s %s%c%s%s%s%s%s",
277                                                  old_hex, new_hex, ref->name, 0,
278                                                  status_report ? " report-status" : "",
279                                                  use_sideband ? " side-band-64k" : "",
280                                                  quiet ? " quiet" : "",
281                                                  agent_supported ? " agent=" : "",
282                                                  agent_supported ? git_user_agent_sanitized() : ""
283                                                 );
284                         }
285                         else
286                                 packet_buf_write(&req_buf, "%s %s %s",
287                                                  old_hex, new_hex, ref->name);
288                         ref->status = status_report ?
289                                 REF_STATUS_EXPECTING_REPORT :
290                                 REF_STATUS_OK;
291                         cmds_sent++;
292                 }
293         }
294
295         if (args->stateless_rpc) {
296                 if (!args->dry_run && (cmds_sent || is_repository_shallow())) {
297                         packet_buf_flush(&req_buf);
298                         send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
299                 }
300         } else {
301                 write_or_die(out, req_buf.buf, req_buf.len);
302                 packet_flush(out);
303         }
304         strbuf_release(&req_buf);
305
306         if (use_sideband && cmds_sent) {
307                 memset(&demux, 0, sizeof(demux));
308                 demux.proc = sideband_demux;
309                 demux.data = fd;
310                 demux.out = -1;
311                 if (start_async(&demux))
312                         die("send-pack: unable to fork off sideband demultiplexer");
313                 in = demux.out;
314         }
315
316         if (new_refs && cmds_sent) {
317                 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
318                         for (ref = remote_refs; ref; ref = ref->next)
319                                 ref->status = REF_STATUS_NONE;
320                         if (args->stateless_rpc)
321                                 close(out);
322                         if (git_connection_is_socket(conn))
323                                 shutdown(fd[0], SHUT_WR);
324                         if (use_sideband)
325                                 finish_async(&demux);
326                         fd[1] = -1;
327                         return -1;
328                 }
329                 if (!args->stateless_rpc)
330                         /* Closed by pack_objects() via start_command() */
331                         fd[1] = -1;
332         }
333         if (args->stateless_rpc && cmds_sent)
334                 packet_flush(out);
335
336         if (status_report && cmds_sent)
337                 ret = receive_status(in, remote_refs);
338         else
339                 ret = 0;
340         if (args->stateless_rpc)
341                 packet_flush(out);
342
343         if (use_sideband && cmds_sent) {
344                 if (finish_async(&demux)) {
345                         error("error in sideband demultiplexer");
346                         ret = -1;
347                 }
348                 close(demux.out);
349         }
350
351         if (ret < 0)
352                 return ret;
353
354         if (args->porcelain)
355                 return 0;
356
357         for (ref = remote_refs; ref; ref = ref->next) {
358                 switch (ref->status) {
359                 case REF_STATUS_NONE:
360                 case REF_STATUS_UPTODATE:
361                 case REF_STATUS_OK:
362                         break;
363                 default:
364                         return -1;
365                 }
366         }
367         return 0;
368 }