send-pack: refactor inspecting and resetting status and sending commands
[git/git.git] / send-pack.c
CommitLineData
f5d942e1
NTND
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"
47a59185 8#include "connect.h"
f5d942e1
NTND
9#include "send-pack.h"
10#include "quote.h"
11#include "transport.h"
12#include "version.h"
13eb4626 13#include "sha1-array.h"
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NTND
14
15static 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 */
13eb4626 32static int pack_objects(int fd, struct ref *refs, struct sha1_array *extra, struct send_pack_args *args)
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NTND
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++)
13eb4626 75 if (!feed_object(extra->sha1[i], po.in, 1))
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NTND
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
108static int receive_status(int in, struct ref *refs)
109{
110 struct ref *hint;
f5d942e1 111 int ret = 0;
74543a04 112 char *line = packet_read_line(in, NULL);
59556548 113 if (!starts_with(line, "unpack "))
f5d942e1 114 return error("did not receive remote status");
819b929d 115 if (strcmp(line, "unpack ok")) {
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116 error("unpack failed: %s", line + 7);
117 ret = -1;
118 }
119 hint = NULL;
120 while (1) {
121 char *refname;
122 char *msg;
74543a04
JK
123 line = packet_read_line(in, NULL);
124 if (!line)
f5d942e1 125 break;
59556548 126 if (!starts_with(line, "ok ") && !starts_with(line, "ng ")) {
8f9e3e49 127 error("invalid ref status from remote: %s", line);
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128 ret = -1;
129 break;
130 }
131
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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
167static 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
f2c681cf
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178static 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
16a2743c 186static void advertise_shallow_grafts_buf(struct strbuf *sb)
f2c681cf
NTND
187{
188 if (!is_repository_shallow())
189 return;
190 for_each_commit_graft(advertise_shallow_grafts_cb, sb);
191}
192
e40671a3
JH
193static 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
f5d942e1
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213int send_pack(struct send_pack_args *args,
214 int fd[], struct child_process *conn,
215 struct ref *remote_refs,
13eb4626 216 struct sha1_array *extra_have)
f5d942e1
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217{
218 int in = fd[0];
219 int out = fd[1];
220 struct strbuf req_buf = STRBUF_INIT;
887f3533 221 struct strbuf cap_buf = STRBUF_INIT;
f5d942e1 222 struct ref *ref;
ab2b0c90 223 int need_pack_data = 0;
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224 int allow_deleting_refs = 0;
225 int status_report = 0;
226 int use_sideband = 0;
227 int quiet_supported = 0;
228 int agent_supported = 0;
229 unsigned cmds_sent = 0;
230 int ret;
231 struct async demux;
232
233 /* Does the other end support the reporting? */
234 if (server_supports("report-status"))
235 status_report = 1;
236 if (server_supports("delete-refs"))
237 allow_deleting_refs = 1;
238 if (server_supports("ofs-delta"))
239 args->use_ofs_delta = 1;
240 if (server_supports("side-band-64k"))
241 use_sideband = 1;
242 if (server_supports("quiet"))
243 quiet_supported = 1;
244 if (server_supports("agent"))
245 agent_supported = 1;
1ba98a79
CMN
246 if (server_supports("no-thin"))
247 args->use_thin_pack = 0;
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248
249 if (!remote_refs) {
250 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
251 "Perhaps you should specify a branch such as 'master'.\n");
252 return 0;
253 }
254
887f3533
JH
255 if (status_report)
256 strbuf_addstr(&cap_buf, " report-status");
257 if (use_sideband)
258 strbuf_addstr(&cap_buf, " side-band-64k");
259 if (quiet_supported && (args->quiet || !args->progress))
260 strbuf_addstr(&cap_buf, " quiet");
261 if (agent_supported)
262 strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
263
621b0599
JH
264 /*
265 * NEEDSWORK: why does delete-refs have to be so specific to
266 * send-pack machinery that set_ref_status_for_push() cannot
267 * set this bit for us???
268 */
269 for (ref = remote_refs; ref; ref = ref->next)
270 if (ref->deletion && !allow_deleting_refs)
271 ref->status = REF_STATUS_REJECT_NODELETE;
272
5dbd7676 273 if (!args->dry_run)
f2c681cf 274 advertise_shallow_grafts_buf(&req_buf);
5dbd7676 275
f5d942e1 276 /*
b783aa71
JH
277 * Clear the status for each ref and see if we need to send
278 * the pack data.
f5d942e1 279 */
f5d942e1 280 for (ref = remote_refs; ref; ref = ref->next) {
e40671a3 281 if (!ref_update_to_be_sent(ref, args))
f5d942e1
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282 continue;
283
f5d942e1 284 if (!ref->deletion)
ab2b0c90 285 need_pack_data = 1;
f5d942e1 286
b783aa71 287 if (args->dry_run || !status_report)
f5d942e1 288 ref->status = REF_STATUS_OK;
b783aa71
JH
289 else
290 ref->status = REF_STATUS_EXPECTING_REPORT;
291 }
292
293 /*
294 * Finally, tell the other end!
295 */
296 for (ref = remote_refs; ref; ref = ref->next) {
297 char *old_hex, *new_hex;
298
299 if (args->dry_run)
300 continue;
301
302 if (!ref_update_to_be_sent(ref, args))
303 continue;
304
305 old_hex = sha1_to_hex(ref->old_sha1);
306 new_hex = sha1_to_hex(ref->new_sha1);
307 if (!cmds_sent)
308 packet_buf_write(&req_buf,
309 "%s %s %s%c%s",
310 old_hex, new_hex, ref->name, 0,
311 cap_buf.buf);
312 else
313 packet_buf_write(&req_buf, "%s %s %s",
314 old_hex, new_hex, ref->name);
315 cmds_sent++;
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316 }
317
318 if (args->stateless_rpc) {
f2c681cf 319 if (!args->dry_run && (cmds_sent || is_repository_shallow())) {
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320 packet_buf_flush(&req_buf);
321 send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
322 }
323 } else {
cdf4fb8e 324 write_or_die(out, req_buf.buf, req_buf.len);
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NTND
325 packet_flush(out);
326 }
327 strbuf_release(&req_buf);
887f3533 328 strbuf_release(&cap_buf);
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NTND
329
330 if (use_sideband && cmds_sent) {
331 memset(&demux, 0, sizeof(demux));
332 demux.proc = sideband_demux;
333 demux.data = fd;
334 demux.out = -1;
335 if (start_async(&demux))
336 die("send-pack: unable to fork off sideband demultiplexer");
337 in = demux.out;
338 }
339
ab2b0c90 340 if (need_pack_data && cmds_sent) {
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341 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
342 for (ref = remote_refs; ref; ref = ref->next)
343 ref->status = REF_STATUS_NONE;
344 if (args->stateless_rpc)
345 close(out);
346 if (git_connection_is_socket(conn))
347 shutdown(fd[0], SHUT_WR);
348 if (use_sideband)
349 finish_async(&demux);
37cb1dd6 350 fd[1] = -1;
f5d942e1
NTND
351 return -1;
352 }
37cb1dd6
JL
353 if (!args->stateless_rpc)
354 /* Closed by pack_objects() via start_command() */
355 fd[1] = -1;
f5d942e1
NTND
356 }
357 if (args->stateless_rpc && cmds_sent)
358 packet_flush(out);
359
360 if (status_report && cmds_sent)
361 ret = receive_status(in, remote_refs);
362 else
363 ret = 0;
364 if (args->stateless_rpc)
365 packet_flush(out);
366
367 if (use_sideband && cmds_sent) {
368 if (finish_async(&demux)) {
369 error("error in sideband demultiplexer");
370 ret = -1;
371 }
372 close(demux.out);
373 }
374
375 if (ret < 0)
376 return ret;
377
378 if (args->porcelain)
379 return 0;
380
381 for (ref = remote_refs; ref; ref = ref->next) {
382 switch (ref->status) {
383 case REF_STATUS_NONE:
384 case REF_STATUS_UPTODATE:
385 case REF_STATUS_OK:
386 break;
387 default:
388 return -1;
389 }
390 }
391 return 0;
392}