Merge branch 'tb/document-status-u-tradeoff' into maint
[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 "send-pack.h"
9 #include "quote.h"
10 #include "transport.h"
11 #include "version.h"
12
13 static int feed_object(const unsigned char *sha1, int fd, int negative)
14 {
15         char buf[42];
16
17         if (negative && !has_sha1_file(sha1))
18                 return 1;
19
20         memcpy(buf + negative, sha1_to_hex(sha1), 40);
21         if (negative)
22                 buf[0] = '^';
23         buf[40 + negative] = '\n';
24         return write_or_whine(fd, buf, 41 + negative, "send-pack: send refs");
25 }
26
27 /*
28  * Make a pack stream and spit it out into file descriptor fd
29  */
30 static int pack_objects(int fd, struct ref *refs, struct extra_have_objects *extra, struct send_pack_args *args)
31 {
32         /*
33          * The child becomes pack-objects --revs; we feed
34          * the revision parameters to it via its stdin and
35          * let its stdout go back to the other end.
36          */
37         const char *argv[] = {
38                 "pack-objects",
39                 "--all-progress-implied",
40                 "--revs",
41                 "--stdout",
42                 NULL,
43                 NULL,
44                 NULL,
45                 NULL,
46                 NULL,
47         };
48         struct child_process po;
49         int i;
50
51         i = 4;
52         if (args->use_thin_pack)
53                 argv[i++] = "--thin";
54         if (args->use_ofs_delta)
55                 argv[i++] = "--delta-base-offset";
56         if (args->quiet || !args->progress)
57                 argv[i++] = "-q";
58         if (args->progress)
59                 argv[i++] = "--progress";
60         memset(&po, 0, sizeof(po));
61         po.argv = argv;
62         po.in = -1;
63         po.out = args->stateless_rpc ? -1 : fd;
64         po.git_cmd = 1;
65         if (start_command(&po))
66                 die_errno("git pack-objects failed");
67
68         /*
69          * We feed the pack-objects we just spawned with revision
70          * parameters by writing to the pipe.
71          */
72         for (i = 0; i < extra->nr; i++)
73                 if (!feed_object(extra->array[i], po.in, 1))
74                         break;
75
76         while (refs) {
77                 if (!is_null_sha1(refs->old_sha1) &&
78                     !feed_object(refs->old_sha1, po.in, 1))
79                         break;
80                 if (!is_null_sha1(refs->new_sha1) &&
81                     !feed_object(refs->new_sha1, po.in, 0))
82                         break;
83                 refs = refs->next;
84         }
85
86         close(po.in);
87
88         if (args->stateless_rpc) {
89                 char *buf = xmalloc(LARGE_PACKET_MAX);
90                 while (1) {
91                         ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
92                         if (n <= 0)
93                                 break;
94                         send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
95                 }
96                 free(buf);
97                 close(po.out);
98                 po.out = -1;
99         }
100
101         if (finish_command(&po))
102                 return -1;
103         return 0;
104 }
105
106 static int receive_status(int in, struct ref *refs)
107 {
108         struct ref *hint;
109         char line[1000];
110         int ret = 0;
111         int len = packet_read_line(in, line, sizeof(line));
112         if (len < 10 || memcmp(line, "unpack ", 7))
113                 return error("did not receive remote status");
114         if (memcmp(line, "unpack ok\n", 10)) {
115                 char *p = line + strlen(line) - 1;
116                 if (*p == '\n')
117                         *p = '\0';
118                 error("unpack failed: %s", line + 7);
119                 ret = -1;
120         }
121         hint = NULL;
122         while (1) {
123                 char *refname;
124                 char *msg;
125                 len = packet_read_line(in, line, sizeof(line));
126                 if (!len)
127                         break;
128                 if (len < 3 ||
129                     (memcmp(line, "ok ", 3) && memcmp(line, "ng ", 3))) {
130                         fprintf(stderr, "protocol error: %s\n", line);
131                         ret = -1;
132                         break;
133                 }
134
135                 line[strlen(line)-1] = '\0';
136                 refname = line + 3;
137                 msg = strchr(refname, ' ');
138                 if (msg)
139                         *msg++ = '\0';
140
141                 /* first try searching at our hint, falling back to all refs */
142                 if (hint)
143                         hint = find_ref_by_name(hint, refname);
144                 if (!hint)
145                         hint = find_ref_by_name(refs, refname);
146                 if (!hint) {
147                         warning("remote reported status on unknown ref: %s",
148                                         refname);
149                         continue;
150                 }
151                 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
152                         warning("remote reported status on unexpected ref: %s",
153                                         refname);
154                         continue;
155                 }
156
157                 if (line[0] == 'o' && line[1] == 'k')
158                         hint->status = REF_STATUS_OK;
159                 else {
160                         hint->status = REF_STATUS_REMOTE_REJECT;
161                         ret = -1;
162                 }
163                 if (msg)
164                         hint->remote_status = xstrdup(msg);
165                 /* start our next search from the next ref */
166                 hint = hint->next;
167         }
168         return ret;
169 }
170
171 static int sideband_demux(int in, int out, void *data)
172 {
173         int *fd = data, ret;
174 #ifdef NO_PTHREADS
175         close(fd[1]);
176 #endif
177         ret = recv_sideband("send-pack", fd[0], out);
178         close(out);
179         return ret;
180 }
181
182 int send_pack(struct send_pack_args *args,
183               int fd[], struct child_process *conn,
184               struct ref *remote_refs,
185               struct extra_have_objects *extra_have)
186 {
187         int in = fd[0];
188         int out = fd[1];
189         struct strbuf req_buf = STRBUF_INIT;
190         struct ref *ref;
191         int new_refs;
192         int allow_deleting_refs = 0;
193         int status_report = 0;
194         int use_sideband = 0;
195         int quiet_supported = 0;
196         int agent_supported = 0;
197         unsigned cmds_sent = 0;
198         int ret;
199         struct async demux;
200
201         /* Does the other end support the reporting? */
202         if (server_supports("report-status"))
203                 status_report = 1;
204         if (server_supports("delete-refs"))
205                 allow_deleting_refs = 1;
206         if (server_supports("ofs-delta"))
207                 args->use_ofs_delta = 1;
208         if (server_supports("side-band-64k"))
209                 use_sideband = 1;
210         if (server_supports("quiet"))
211                 quiet_supported = 1;
212         if (server_supports("agent"))
213                 agent_supported = 1;
214
215         if (!remote_refs) {
216                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
217                         "Perhaps you should specify a branch such as 'master'.\n");
218                 return 0;
219         }
220
221         /*
222          * Finally, tell the other end!
223          */
224         new_refs = 0;
225         for (ref = remote_refs; ref; ref = ref->next) {
226                 if (!ref->peer_ref && !args->send_mirror)
227                         continue;
228
229                 /* Check for statuses set by set_ref_status_for_push() */
230                 switch (ref->status) {
231                 case REF_STATUS_REJECT_NONFASTFORWARD:
232                 case REF_STATUS_REJECT_ALREADY_EXISTS:
233                 case REF_STATUS_REJECT_FETCH_FIRST:
234                 case REF_STATUS_REJECT_NEEDS_FORCE:
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                 safe_write(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                         return -1;
310                 }
311         }
312         if (args->stateless_rpc && cmds_sent)
313                 packet_flush(out);
314
315         if (status_report && cmds_sent)
316                 ret = receive_status(in, remote_refs);
317         else
318                 ret = 0;
319         if (args->stateless_rpc)
320                 packet_flush(out);
321
322         if (use_sideband && cmds_sent) {
323                 if (finish_async(&demux)) {
324                         error("error in sideband demultiplexer");
325                         ret = -1;
326                 }
327                 close(demux.out);
328         }
329
330         if (ret < 0)
331                 return ret;
332
333         if (args->porcelain)
334                 return 0;
335
336         for (ref = remote_refs; ref; ref = ref->next) {
337                 switch (ref->status) {
338                 case REF_STATUS_NONE:
339                 case REF_STATUS_UPTODATE:
340                 case REF_STATUS_OK:
341                         break;
342                 default:
343                         return -1;
344                 }
345         }
346         return 0;
347 }