receive-pack: support pushing to a shallow clone via http
[git/git.git] / send-pack.c
... / ...
CommitLineData
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
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 */
32static 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
108static 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 (prefixcmp(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 (prefixcmp(line, "ok ") && prefixcmp(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
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
178int send_pack(struct send_pack_args *args,
179 int fd[], struct child_process *conn,
180 struct ref *remote_refs,
181 struct sha1_array *extra_have)
182{
183 int in = fd[0];
184 int out = fd[1];
185 struct strbuf req_buf = STRBUF_INIT;
186 struct ref *ref;
187 int new_refs;
188 int allow_deleting_refs = 0;
189 int status_report = 0;
190 int use_sideband = 0;
191 int quiet_supported = 0;
192 int agent_supported = 0;
193 unsigned cmds_sent = 0;
194 int ret;
195 struct async demux;
196
197 /* Does the other end support the reporting? */
198 if (server_supports("report-status"))
199 status_report = 1;
200 if (server_supports("delete-refs"))
201 allow_deleting_refs = 1;
202 if (server_supports("ofs-delta"))
203 args->use_ofs_delta = 1;
204 if (server_supports("side-band-64k"))
205 use_sideband = 1;
206 if (server_supports("quiet"))
207 quiet_supported = 1;
208 if (server_supports("agent"))
209 agent_supported = 1;
210
211 if (!remote_refs) {
212 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
213 "Perhaps you should specify a branch such as 'master'.\n");
214 return 0;
215 }
216
217 if (!args->dry_run)
218 advertise_shallow_grafts(out);
219
220 /*
221 * Finally, tell the other end!
222 */
223 new_refs = 0;
224 for (ref = remote_refs; ref; ref = ref->next) {
225 if (!ref->peer_ref && !args->send_mirror)
226 continue;
227
228 /* Check for statuses set by set_ref_status_for_push() */
229 switch (ref->status) {
230 case REF_STATUS_REJECT_NONFASTFORWARD:
231 case REF_STATUS_REJECT_ALREADY_EXISTS:
232 case REF_STATUS_REJECT_FETCH_FIRST:
233 case REF_STATUS_REJECT_NEEDS_FORCE:
234 case REF_STATUS_REJECT_STALE:
235 case REF_STATUS_UPTODATE:
236 continue;
237 default:
238 ; /* do nothing */
239 }
240
241 if (ref->deletion && !allow_deleting_refs) {
242 ref->status = REF_STATUS_REJECT_NODELETE;
243 continue;
244 }
245
246 if (!ref->deletion)
247 new_refs++;
248
249 if (args->dry_run) {
250 ref->status = REF_STATUS_OK;
251 } else {
252 char *old_hex = sha1_to_hex(ref->old_sha1);
253 char *new_hex = sha1_to_hex(ref->new_sha1);
254 int quiet = quiet_supported && (args->quiet || !args->progress);
255
256 if (!cmds_sent && (status_report || use_sideband ||
257 quiet || agent_supported)) {
258 packet_buf_write(&req_buf,
259 "%s %s %s%c%s%s%s%s%s",
260 old_hex, new_hex, ref->name, 0,
261 status_report ? " report-status" : "",
262 use_sideband ? " side-band-64k" : "",
263 quiet ? " quiet" : "",
264 agent_supported ? " agent=" : "",
265 agent_supported ? git_user_agent_sanitized() : ""
266 );
267 }
268 else
269 packet_buf_write(&req_buf, "%s %s %s",
270 old_hex, new_hex, ref->name);
271 ref->status = status_report ?
272 REF_STATUS_EXPECTING_REPORT :
273 REF_STATUS_OK;
274 cmds_sent++;
275 }
276 }
277
278 if (args->stateless_rpc) {
279 if (!args->dry_run && cmds_sent) {
280 packet_buf_flush(&req_buf);
281 send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
282 }
283 } else {
284 write_or_die(out, req_buf.buf, req_buf.len);
285 packet_flush(out);
286 }
287 strbuf_release(&req_buf);
288
289 if (use_sideband && cmds_sent) {
290 memset(&demux, 0, sizeof(demux));
291 demux.proc = sideband_demux;
292 demux.data = fd;
293 demux.out = -1;
294 if (start_async(&demux))
295 die("send-pack: unable to fork off sideband demultiplexer");
296 in = demux.out;
297 }
298
299 if (new_refs && cmds_sent) {
300 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
301 for (ref = remote_refs; ref; ref = ref->next)
302 ref->status = REF_STATUS_NONE;
303 if (args->stateless_rpc)
304 close(out);
305 if (git_connection_is_socket(conn))
306 shutdown(fd[0], SHUT_WR);
307 if (use_sideband)
308 finish_async(&demux);
309 fd[1] = -1;
310 return -1;
311 }
312 if (!args->stateless_rpc)
313 /* Closed by pack_objects() via start_command() */
314 fd[1] = -1;
315 }
316 if (args->stateless_rpc && cmds_sent)
317 packet_flush(out);
318
319 if (status_report && cmds_sent)
320 ret = receive_status(in, remote_refs);
321 else
322 ret = 0;
323 if (args->stateless_rpc)
324 packet_flush(out);
325
326 if (use_sideband && cmds_sent) {
327 if (finish_async(&demux)) {
328 error("error in sideband demultiplexer");
329 ret = -1;
330 }
331 close(demux.out);
332 }
333
334 if (ret < 0)
335 return ret;
336
337 if (args->porcelain)
338 return 0;
339
340 for (ref = remote_refs; ref; ref = ref->next) {
341 switch (ref->status) {
342 case REF_STATUS_NONE:
343 case REF_STATUS_UPTODATE:
344 case REF_STATUS_OK:
345 break;
346 default:
347 return -1;
348 }
349 }
350 return 0;
351}