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 void update_tracking_ref(struct remote *remote, struct ref *ref)
182{
183 struct refspec rs;
184 int will_delete_ref;
185 rs.src = ref->name;
187 rs.dst = NULL;
188 if (!ref->peer_ref)
190 return;
191 will_delete_ref = is_null_sha1(ref->peer_ref->new_sha1);
193 if (!will_delete_ref &&
195 !hashcmp(ref->old_sha1, ref->peer_ref->new_sha1))
196 return;
197 if (!remote_find_tracking(remote, &rs)) {
199 fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
200 if (is_null_sha1(ref->peer_ref->new_sha1)) {
201 if (delete_ref(rs.dst, NULL))
202 error("Failed to delete");
203 } else
204 update_ref("update by push", rs.dst,
205 ref->new_sha1, NULL, 0, 0);
206 free(rs.dst);
207 }
208}
209static int send_pack(int in, int out, struct remote *remote, int nr_refspec, char **refspec)
211{
212 struct ref *ref;
213 int new_refs;
214 int ret = 0;
215 int ask_for_status_report = 0;
216 int allow_deleting_refs = 0;
217 int expect_status_report = 0;
218 /* No funny business with the matcher */
220 remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
221 get_local_heads();
222 /* Does the other end support the reporting? */
224 if (server_supports("report-status"))
225 ask_for_status_report = 1;
226 if (server_supports("delete-refs"))
227 allow_deleting_refs = 1;
228 /* match them up */
230 if (!remote_tail)
231 remote_tail = &remote_refs;
232 if (match_refs(local_refs, remote_refs, &remote_tail,
233 nr_refspec, refspec, send_all))
234 return -1;
235 if (!remote_refs) {
237 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
238 "Perhaps you should specify a branch such as 'master'.\n");
239 return 0;
240 }
241 /*
243 * Finally, tell the other end!
244 */
245 new_refs = 0;
246 for (ref = remote_refs; ref; ref = ref->next) {
247 char old_hex[60], *new_hex;
248 int will_delete_ref;
249 if (!ref->peer_ref)
251 continue;
252 will_delete_ref = is_null_sha1(ref->peer_ref->new_sha1);
255 if (will_delete_ref && !allow_deleting_refs) {
256 error("remote does not support deleting refs");
257 ret = -2;
258 continue;
259 }
260 if (!will_delete_ref &&
261 !hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
262 if (verbose)
263 fprintf(stderr, "'%s': up-to-date\n", ref->name);
264 continue;
265 }
266 /* This part determines what can overwrite what.
268 * The rules are:
269 *
270 * (0) you can always use --force or +A:B notation to
271 * selectively force individual ref pairs.
272 *
273 * (1) if the old thing does not exist, it is OK.
274 *
275 * (2) if you do not have the old thing, you are not allowed
276 * to overwrite it; you would not know what you are losing
277 * otherwise.
278 *
279 * (3) if both new and old are commit-ish, and new is a
280 * descendant of old, it is OK.
281 *
282 * (4) regardless of all of the above, removing :B is
283 * always allowed.
284 */
285 if (!force_update &&
287 !will_delete_ref &&
288 !is_null_sha1(ref->old_sha1) &&
289 !ref->force) {
290 if (!has_sha1_file(ref->old_sha1) ||
291 !ref_newer(ref->peer_ref->new_sha1,
292 ref->old_sha1)) {
293 /* We do not have the remote ref, or
294 * we know that the remote ref is not
295 * an ancestor of what we are trying to
296 * push. Either way this can be losing
297 * commits at the remote end and likely
298 * we were not up to date to begin with.
299 */
300 error("remote '%s' is not a strict "
301 "subset of local ref '%s'. "
302 "maybe you are not up-to-date and "
303 "need to pull first?",
304 ref->name,
305 ref->peer_ref->name);
306 ret = -2;
307 continue;
308 }
309 }
310 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
311 if (!will_delete_ref)
312 new_refs++;
313 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
314 new_hex = sha1_to_hex(ref->new_sha1);
315 if (!dry_run) {
317 if (ask_for_status_report) {
318 packet_write(out, "%s %s %s%c%s",
319 old_hex, new_hex, ref->name, 0,
320 "report-status");
321 ask_for_status_report = 0;
322 expect_status_report = 1;
323 }
324 else
325 packet_write(out, "%s %s %s",
326 old_hex, new_hex, ref->name);
327 }
328 if (will_delete_ref)
329 fprintf(stderr, "deleting '%s'\n", ref->name);
330 else {
331 fprintf(stderr, "updating '%s'", ref->name);
332 if (strcmp(ref->name, ref->peer_ref->name))
333 fprintf(stderr, " using '%s'",
334 ref->peer_ref->name);
335 fprintf(stderr, "\n from %s\n to %s\n",
336 old_hex, new_hex);
337 }
338 }
339 packet_flush(out);
341 if (new_refs && !dry_run)
342 ret = pack_objects(out, remote_refs);
343 close(out);
344 if (expect_status_report) {
346 if (receive_status(in))
347 ret = -4;
348 }
349 if (!dry_run && remote && ret == 0) {
351 for (ref = remote_refs; ref; ref = ref->next)
352 update_tracking_ref(remote, ref);
353 }
354 if (!new_refs && ret == 0)
356 fprintf(stderr, "Everything up-to-date\n");
357 return ret;
358}
359static void verify_remote_names(int nr_heads, char **heads)
361{
362 int i;
363 for (i = 0; i < nr_heads; i++) {
365 const char *remote = strchr(heads[i], ':');
366 remote = remote ? (remote + 1) : heads[i];
368 switch (check_ref_format(remote)) {
369 case 0: /* ok */
370 case -2: /* ok but a single level -- that is fine for
371 * a match pattern.
372 */
373 case -3: /* ok but ends with a pattern-match character */
374 continue;
375 }
376 die("remote part of refspec is not a valid name in %s",
377 heads[i]);
378 }
379}
380int main(int argc, char **argv)
382{
383 int i, nr_heads = 0;
384 char *dest = NULL;
385 char **heads = NULL;
386 int fd[2], ret;
387 struct child_process *conn;
388 char *remote_name = NULL;
389 struct remote *remote = NULL;
390 setup_git_directory();
392 git_config(git_default_config);
393 argv++;
395 for (i = 1; i < argc; i++, argv++) {
396 char *arg = *argv;
397 if (*arg == '-') {
399 if (!prefixcmp(arg, "--receive-pack=")) {
400 receivepack = arg + 15;
401 continue;
402 }
403 if (!prefixcmp(arg, "--exec=")) {
404 receivepack = arg + 7;
405 continue;
406 }
407 if (!prefixcmp(arg, "--remote=")) {
408 remote_name = arg + 9;
409 continue;
410 }
411 if (!strcmp(arg, "--all")) {
412 send_all = 1;
413 continue;
414 }
415 if (!strcmp(arg, "--dry-run")) {
416 dry_run = 1;
417 continue;
418 }
419 if (!strcmp(arg, "--force")) {
420 force_update = 1;
421 continue;
422 }
423 if (!strcmp(arg, "--verbose")) {
424 verbose = 1;
425 continue;
426 }
427 if (!strcmp(arg, "--thin")) {
428 use_thin_pack = 1;
429 continue;
430 }
431 usage(send_pack_usage);
432 }
433 if (!dest) {
434 dest = arg;
435 continue;
436 }
437 heads = argv;
438 nr_heads = argc - i;
439 break;
440 }
441 if (!dest)
442 usage(send_pack_usage);
443 if (heads && send_all)
444 usage(send_pack_usage);
445 verify_remote_names(nr_heads, heads);
446 if (remote_name) {
448 remote = remote_get(remote_name);
449 if (!remote_has_url(remote, dest)) {
450 die("Destination %s is not a uri for %s",
451 dest, remote_name);
452 }
453 }
454 conn = git_connect(fd, dest, receivepack, verbose ? CONNECT_VERBOSE : 0);
456 ret = send_pack(fd[0], fd[1], remote, nr_heads, heads);
457 close(fd[0]);
458 close(fd[1]);
459 ret |= finish_connect(conn);
460 return !!ret;
461}