7b776243e666014521c62276923b3b17fc739fe2
[git/git.git] / send-pack.c
1 #include "cache.h"
2 #include "commit.h"
3 #include "tag.h"
4 #include "refs.h"
5 #include "pkt-line.h"
6 #include "run-command.h"
7 #include "remote.h"
8
9 static const char send_pack_usage[] =
10 "git-send-pack [--all] [--dry-run] [--force] [--receive-pack=<git-receive-pack>] [--verbose] [--thin] [<host>:]<directory> [<ref>...]\n"
11 " --all and explicit <ref> specification are mutually exclusive.";
12 static const char *receivepack = "git-receive-pack";
13 static int verbose;
14 static int send_all;
15 static int force_update;
16 static int use_thin_pack;
17 static int dry_run;
18
19 /*
20 * Make a pack stream and spit it out into file descriptor fd
21 */
22 static int pack_objects(int fd, struct ref *refs)
23 {
24 /*
25 * The child becomes pack-objects --revs; we feed
26 * the revision parameters to it via its stdin and
27 * let its stdout go back to the other end.
28 */
29 const char *args[] = {
30 "pack-objects",
31 "--all-progress",
32 "--revs",
33 "--stdout",
34 NULL,
35 NULL,
36 };
37 struct child_process po;
38
39 if (use_thin_pack)
40 args[4] = "--thin";
41 memset(&po, 0, sizeof(po));
42 po.argv = args;
43 po.in = -1;
44 po.out = fd;
45 po.git_cmd = 1;
46 if (start_command(&po))
47 die("git-pack-objects failed (%s)", strerror(errno));
48
49 /*
50 * We feed the pack-objects we just spawned with revision
51 * parameters by writing to the pipe.
52 */
53 while (refs) {
54 char buf[42];
55
56 if (!is_null_sha1(refs->old_sha1) &&
57 has_sha1_file(refs->old_sha1)) {
58 memcpy(buf + 1, sha1_to_hex(refs->old_sha1), 40);
59 buf[0] = '^';
60 buf[41] = '\n';
61 if (!write_or_whine(po.in, buf, 42,
62 "send-pack: send refs"))
63 break;
64 }
65 if (!is_null_sha1(refs->new_sha1)) {
66 memcpy(buf, sha1_to_hex(refs->new_sha1), 40);
67 buf[40] = '\n';
68 if (!write_or_whine(po.in, buf, 41,
69 "send-pack: send refs"))
70 break;
71 }
72 refs = refs->next;
73 }
74
75 if (finish_command(&po))
76 return error("pack-objects died with strange error");
77 return 0;
78 }
79
80 static void unmark_and_free(struct commit_list *list, unsigned int mark)
81 {
82 while (list) {
83 struct commit_list *temp = list;
84 temp->item->object.flags &= ~mark;
85 list = temp->next;
86 free(temp);
87 }
88 }
89
90 static int ref_newer(const unsigned char *new_sha1,
91 const unsigned char *old_sha1)
92 {
93 struct object *o;
94 struct commit *old, *new;
95 struct commit_list *list, *used;
96 int found = 0;
97
98 /* Both new and old must be commit-ish and new is descendant of
99 * old. Otherwise we require --force.
100 */
101 o = deref_tag(parse_object(old_sha1), NULL, 0);
102 if (!o || o->type != OBJ_COMMIT)
103 return 0;
104 old = (struct commit *) o;
105
106 o = deref_tag(parse_object(new_sha1), NULL, 0);
107 if (!o || o->type != OBJ_COMMIT)
108 return 0;
109 new = (struct commit *) o;
110
111 if (parse_commit(new) < 0)
112 return 0;
113
114 used = list = NULL;
115 commit_list_insert(new, &list);
116 while (list) {
117 new = pop_most_recent_commit(&list, 1);
118 commit_list_insert(new, &used);
119 if (new == old) {
120 found = 1;
121 break;
122 }
123 }
124 unmark_and_free(list, 1);
125 unmark_and_free(used, 1);
126 return found;
127 }
128
129 static struct ref *local_refs, **local_tail;
130 static struct ref *remote_refs, **remote_tail;
131
132 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
133 {
134 struct ref *ref;
135 int len = strlen(refname) + 1;
136 ref = xcalloc(1, sizeof(*ref) + len);
137 hashcpy(ref->new_sha1, sha1);
138 memcpy(ref->name, refname, len);
139 *local_tail = ref;
140 local_tail = &ref->next;
141 return 0;
142 }
143
144 static void get_local_heads(void)
145 {
146 local_tail = &local_refs;
147 for_each_ref(one_local_ref, NULL);
148 }
149
150 static int receive_status(int in)
151 {
152 char line[1000];
153 int ret = 0;
154 int len = packet_read_line(in, line, sizeof(line));
155 if (len < 10 || memcmp(line, "unpack ", 7)) {
156 fprintf(stderr, "did not receive status back\n");
157 return -1;
158 }
159 if (memcmp(line, "unpack ok\n", 10)) {
160 fputs(line, stderr);
161 ret = -1;
162 }
163 while (1) {
164 len = packet_read_line(in, line, sizeof(line));
165 if (!len)
166 break;
167 if (len < 3 ||
168 (memcmp(line, "ok", 2) && memcmp(line, "ng", 2))) {
169 fprintf(stderr, "protocol error: %s\n", line);
170 ret = -1;
171 break;
172 }
173 if (!memcmp(line, "ok", 2))
174 continue;
175 fputs(line, stderr);
176 ret = -1;
177 }
178 return ret;
179 }
180
181 static int send_pack(int in, int out, struct remote *remote, int nr_refspec, char **refspec)
182 {
183 struct ref *ref;
184 int new_refs;
185 int ret = 0;
186 int ask_for_status_report = 0;
187 int allow_deleting_refs = 0;
188 int expect_status_report = 0;
189
190 /* No funny business with the matcher */
191 remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
192 get_local_heads();
193
194 /* Does the other end support the reporting? */
195 if (server_supports("report-status"))
196 ask_for_status_report = 1;
197 if (server_supports("delete-refs"))
198 allow_deleting_refs = 1;
199
200 /* match them up */
201 if (!remote_tail)
202 remote_tail = &remote_refs;
203 if (match_refs(local_refs, remote_refs, &remote_tail,
204 nr_refspec, refspec, send_all))
205 return -1;
206
207 if (!remote_refs) {
208 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
209 return 0;
210 }
211
212 /*
213 * Finally, tell the other end!
214 */
215 new_refs = 0;
216 for (ref = remote_refs; ref; ref = ref->next) {
217 char old_hex[60], *new_hex;
218 int will_delete_ref;
219
220 if (!ref->peer_ref)
221 continue;
222
223
224 will_delete_ref = is_null_sha1(ref->peer_ref->new_sha1);
225 if (will_delete_ref && !allow_deleting_refs) {
226 error("remote does not support deleting refs");
227 ret = -2;
228 continue;
229 }
230 if (!will_delete_ref &&
231 !hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
232 if (verbose)
233 fprintf(stderr, "'%s': up-to-date\n", ref->name);
234 continue;
235 }
236
237 /* This part determines what can overwrite what.
238 * The rules are:
239 *
240 * (0) you can always use --force or +A:B notation to
241 * selectively force individual ref pairs.
242 *
243 * (1) if the old thing does not exist, it is OK.
244 *
245 * (2) if you do not have the old thing, you are not allowed
246 * to overwrite it; you would not know what you are losing
247 * otherwise.
248 *
249 * (3) if both new and old are commit-ish, and new is a
250 * descendant of old, it is OK.
251 *
252 * (4) regardless of all of the above, removing :B is
253 * always allowed.
254 */
255
256 if (!force_update &&
257 !will_delete_ref &&
258 !is_null_sha1(ref->old_sha1) &&
259 !ref->force) {
260 if (!has_sha1_file(ref->old_sha1) ||
261 !ref_newer(ref->peer_ref->new_sha1,
262 ref->old_sha1)) {
263 /* We do not have the remote ref, or
264 * we know that the remote ref is not
265 * an ancestor of what we are trying to
266 * push. Either way this can be losing
267 * commits at the remote end and likely
268 * we were not up to date to begin with.
269 */
270 error("remote '%s' is not a strict "
271 "subset of local ref '%s'. "
272 "maybe you are not up-to-date and "
273 "need to pull first?",
274 ref->name,
275 ref->peer_ref->name);
276 ret = -2;
277 continue;
278 }
279 }
280 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
281 if (!will_delete_ref)
282 new_refs++;
283 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
284 new_hex = sha1_to_hex(ref->new_sha1);
285
286 if (!dry_run) {
287 if (ask_for_status_report) {
288 packet_write(out, "%s %s %s%c%s",
289 old_hex, new_hex, ref->name, 0,
290 "report-status");
291 ask_for_status_report = 0;
292 expect_status_report = 1;
293 }
294 else
295 packet_write(out, "%s %s %s",
296 old_hex, new_hex, ref->name);
297 }
298 if (will_delete_ref)
299 fprintf(stderr, "deleting '%s'\n", ref->name);
300 else {
301 fprintf(stderr, "updating '%s'", ref->name);
302 if (strcmp(ref->name, ref->peer_ref->name))
303 fprintf(stderr, " using '%s'",
304 ref->peer_ref->name);
305 fprintf(stderr, "\n from %s\n to %s\n",
306 old_hex, new_hex);
307 }
308 if (remote && !dry_run) {
309 struct refspec rs;
310 rs.src = ref->name;
311 rs.dst = NULL;
312 if (!remote_find_tracking(remote, &rs)) {
313 fprintf(stderr, " Also local %s\n", rs.dst);
314 if (will_delete_ref) {
315 if (delete_ref(rs.dst, NULL)) {
316 error("Failed to delete");
317 }
318 } else
319 update_ref("update by push", rs.dst,
320 ref->new_sha1, NULL, 0, 0);
321 free(rs.dst);
322 }
323 }
324 }
325
326 packet_flush(out);
327 if (new_refs && !dry_run)
328 ret = pack_objects(out, remote_refs);
329 close(out);
330
331 if (expect_status_report) {
332 if (receive_status(in))
333 ret = -4;
334 }
335
336 if (!new_refs && ret == 0)
337 fprintf(stderr, "Everything up-to-date\n");
338 return ret;
339 }
340
341 static void verify_remote_names(int nr_heads, char **heads)
342 {
343 int i;
344
345 for (i = 0; i < nr_heads; i++) {
346 const char *remote = strchr(heads[i], ':');
347
348 remote = remote ? (remote + 1) : heads[i];
349 switch (check_ref_format(remote)) {
350 case 0: /* ok */
351 case -2: /* ok but a single level -- that is fine for
352 * a match pattern.
353 */
354 case -3: /* ok but ends with a pattern-match character */
355 continue;
356 }
357 die("remote part of refspec is not a valid name in %s",
358 heads[i]);
359 }
360 }
361
362 int main(int argc, char **argv)
363 {
364 int i, nr_heads = 0;
365 char *dest = NULL;
366 char **heads = NULL;
367 int fd[2], ret;
368 pid_t pid;
369 char *remote_name = NULL;
370 struct remote *remote = NULL;
371
372 setup_git_directory();
373 git_config(git_default_config);
374
375 argv++;
376 for (i = 1; i < argc; i++, argv++) {
377 char *arg = *argv;
378
379 if (*arg == '-') {
380 if (!prefixcmp(arg, "--receive-pack=")) {
381 receivepack = arg + 15;
382 continue;
383 }
384 if (!prefixcmp(arg, "--exec=")) {
385 receivepack = arg + 7;
386 continue;
387 }
388 if (!prefixcmp(arg, "--remote=")) {
389 remote_name = arg + 9;
390 continue;
391 }
392 if (!strcmp(arg, "--all")) {
393 send_all = 1;
394 continue;
395 }
396 if (!strcmp(arg, "--dry-run")) {
397 dry_run = 1;
398 continue;
399 }
400 if (!strcmp(arg, "--force")) {
401 force_update = 1;
402 continue;
403 }
404 if (!strcmp(arg, "--verbose")) {
405 verbose = 1;
406 continue;
407 }
408 if (!strcmp(arg, "--thin")) {
409 use_thin_pack = 1;
410 continue;
411 }
412 usage(send_pack_usage);
413 }
414 if (!dest) {
415 dest = arg;
416 continue;
417 }
418 heads = argv;
419 nr_heads = argc - i;
420 break;
421 }
422 if (!dest)
423 usage(send_pack_usage);
424 if (heads && send_all)
425 usage(send_pack_usage);
426 verify_remote_names(nr_heads, heads);
427
428 if (remote_name) {
429 remote = remote_get(remote_name);
430 if (!remote_has_url(remote, dest)) {
431 die("Destination %s is not a uri for %s",
432 dest, remote_name);
433 }
434 }
435
436 pid = git_connect(fd, dest, receivepack, verbose ? CONNECT_VERBOSE : 0);
437 if (pid < 0)
438 return 1;
439 ret = send_pack(fd[0], fd[1], remote, nr_heads, heads);
440 close(fd[0]);
441 close(fd[1]);
442 ret |= finish_connect(pid);
443 return !!ret;
444 }