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"
8static 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.";
12static const char *receivepack = "git-receive-pack";
13static int verbose;
14static int send_all;
15static int force_update;
16static int use_thin_pack;
17static int dry_run;
18/*
20 * Make a pack stream and spit it out into file descriptor fd
21 */
22static 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 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 /*
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 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 if (finish_command(&po))
76 return error("pack-objects died with strange error");
77 return 0;
78}
79static 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}
89static 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 /* 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 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 if (parse_commit(new) < 0)
112 return 0;
113 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}
128static struct ref *local_refs, **local_tail;
130static struct ref *remote_refs, **remote_tail;
131static 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}
143static void get_local_heads(void)
145{
146 local_tail = &local_refs;
147 for_each_ref(one_local_ref, NULL);
148}
149static 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}
180static 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 /* No funny business with the matcher */
191 remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
192 get_local_heads();
193 /* 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 /* 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 if (!remote_refs) {
208 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
209 "Perhaps you should specify a branch such as 'master'.\n");
210 return 0;
211 }
212 /*
214 * Finally, tell the other end!
215 */
216 new_refs = 0;
217 for (ref = remote_refs; ref; ref = ref->next) {
218 char old_hex[60], *new_hex;
219 int will_delete_ref;
220 if (!ref->peer_ref)
222 continue;
223 will_delete_ref = is_null_sha1(ref->peer_ref->new_sha1);
226 if (will_delete_ref && !allow_deleting_refs) {
227 error("remote does not support deleting refs");
228 ret = -2;
229 continue;
230 }
231 if (!will_delete_ref &&
232 !hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
233 if (verbose)
234 fprintf(stderr, "'%s': up-to-date\n", ref->name);
235 continue;
236 }
237 /* This part determines what can overwrite what.
239 * The rules are:
240 *
241 * (0) you can always use --force or +A:B notation to
242 * selectively force individual ref pairs.
243 *
244 * (1) if the old thing does not exist, it is OK.
245 *
246 * (2) if you do not have the old thing, you are not allowed
247 * to overwrite it; you would not know what you are losing
248 * otherwise.
249 *
250 * (3) if both new and old are commit-ish, and new is a
251 * descendant of old, it is OK.
252 *
253 * (4) regardless of all of the above, removing :B is
254 * always allowed.
255 */
256 if (!force_update &&
258 !will_delete_ref &&
259 !is_null_sha1(ref->old_sha1) &&
260 !ref->force) {
261 if (!has_sha1_file(ref->old_sha1) ||
262 !ref_newer(ref->peer_ref->new_sha1,
263 ref->old_sha1)) {
264 /* We do not have the remote ref, or
265 * we know that the remote ref is not
266 * an ancestor of what we are trying to
267 * push. Either way this can be losing
268 * commits at the remote end and likely
269 * we were not up to date to begin with.
270 */
271 error("remote '%s' is not a strict "
272 "subset of local ref '%s'. "
273 "maybe you are not up-to-date and "
274 "need to pull first?",
275 ref->name,
276 ref->peer_ref->name);
277 ret = -2;
278 continue;
279 }
280 }
281 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
282 if (!will_delete_ref)
283 new_refs++;
284 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
285 new_hex = sha1_to_hex(ref->new_sha1);
286 if (!dry_run) {
288 if (ask_for_status_report) {
289 packet_write(out, "%s %s %s%c%s",
290 old_hex, new_hex, ref->name, 0,
291 "report-status");
292 ask_for_status_report = 0;
293 expect_status_report = 1;
294 }
295 else
296 packet_write(out, "%s %s %s",
297 old_hex, new_hex, ref->name);
298 }
299 if (will_delete_ref)
300 fprintf(stderr, "deleting '%s'\n", ref->name);
301 else {
302 fprintf(stderr, "updating '%s'", ref->name);
303 if (strcmp(ref->name, ref->peer_ref->name))
304 fprintf(stderr, " using '%s'",
305 ref->peer_ref->name);
306 fprintf(stderr, "\n from %s\n to %s\n",
307 old_hex, new_hex);
308 }
309 if (remote && !dry_run) {
310 struct refspec rs;
311 rs.src = ref->name;
312 rs.dst = NULL;
313 if (!remote_find_tracking(remote, &rs)) {
314 fprintf(stderr, " Also local %s\n", rs.dst);
315 if (will_delete_ref) {
316 if (delete_ref(rs.dst, NULL)) {
317 error("Failed to delete");
318 }
319 } else
320 update_ref("update by push", rs.dst,
321 ref->new_sha1, NULL, 0, 0);
322 free(rs.dst);
323 }
324 }
325 }
326 packet_flush(out);
328 if (new_refs && !dry_run)
329 ret = pack_objects(out, remote_refs);
330 close(out);
331 if (expect_status_report) {
333 if (receive_status(in))
334 ret = -4;
335 }
336 if (!new_refs && ret == 0)
338 fprintf(stderr, "Everything up-to-date\n");
339 return ret;
340}
341static void verify_remote_names(int nr_heads, char **heads)
343{
344 int i;
345 for (i = 0; i < nr_heads; i++) {
347 const char *remote = strchr(heads[i], ':');
348 remote = remote ? (remote + 1) : heads[i];
350 switch (check_ref_format(remote)) {
351 case 0: /* ok */
352 case -2: /* ok but a single level -- that is fine for
353 * a match pattern.
354 */
355 case -3: /* ok but ends with a pattern-match character */
356 continue;
357 }
358 die("remote part of refspec is not a valid name in %s",
359 heads[i]);
360 }
361}
362int main(int argc, char **argv)
364{
365 int i, nr_heads = 0;
366 char *dest = NULL;
367 char **heads = NULL;
368 int fd[2], ret;
369 pid_t pid;
370 char *remote_name = NULL;
371 struct remote *remote = NULL;
372 setup_git_directory();
374 git_config(git_default_config);
375 argv++;
377 for (i = 1; i < argc; i++, argv++) {
378 char *arg = *argv;
379 if (*arg == '-') {
381 if (!prefixcmp(arg, "--receive-pack=")) {
382 receivepack = arg + 15;
383 continue;
384 }
385 if (!prefixcmp(arg, "--exec=")) {
386 receivepack = arg + 7;
387 continue;
388 }
389 if (!prefixcmp(arg, "--remote=")) {
390 remote_name = arg + 9;
391 continue;
392 }
393 if (!strcmp(arg, "--all")) {
394 send_all = 1;
395 continue;
396 }
397 if (!strcmp(arg, "--dry-run")) {
398 dry_run = 1;
399 continue;
400 }
401 if (!strcmp(arg, "--force")) {
402 force_update = 1;
403 continue;
404 }
405 if (!strcmp(arg, "--verbose")) {
406 verbose = 1;
407 continue;
408 }
409 if (!strcmp(arg, "--thin")) {
410 use_thin_pack = 1;
411 continue;
412 }
413 usage(send_pack_usage);
414 }
415 if (!dest) {
416 dest = arg;
417 continue;
418 }
419 heads = argv;
420 nr_heads = argc - i;
421 break;
422 }
423 if (!dest)
424 usage(send_pack_usage);
425 if (heads && send_all)
426 usage(send_pack_usage);
427 verify_remote_names(nr_heads, heads);
428 if (remote_name) {
430 remote = remote_get(remote_name);
431 if (!remote_has_uri(remote, dest)) {
432 die("Destination %s is not a uri for %s",
433 dest, remote_name);
434 }
435 }
436 pid = git_connect(fd, dest, receivepack, verbose ? CONNECT_VERBOSE : 0);
438 if (pid < 0)
439 return 1;
440 ret = send_pack(fd[0], fd[1], remote, nr_heads, heads);
441 close(fd[0]);
442 close(fd[1]);
443 ret |= finish_connect(pid);
444 return !!ret;
445}