c1fd3f5fbb912e0d663e91007158460df33f3098
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#include "send-pack.h"
9static const char send_pack_usage[] =
11"git-send-pack [--all] [--dry-run] [--force] [--receive-pack=<git-receive-pack>] [--verbose] [--thin] [<host>:]<directory> [<ref>...]\n"
12" --all and explicit <ref> specification are mutually exclusive.";
13static struct send_pack_args args = {
15 /* .receivepack = */ "git-receive-pack",
16};
17/*
19 * Make a pack stream and spit it out into file descriptor fd
20 */
21static int pack_objects(int fd, struct ref *refs)
22{
23 /*
24 * The child becomes pack-objects --revs; we feed
25 * the revision parameters to it via its stdin and
26 * let its stdout go back to the other end.
27 */
28 const char *argv[] = {
29 "pack-objects",
30 "--all-progress",
31 "--revs",
32 "--stdout",
33 NULL,
34 NULL,
35 };
36 struct child_process po;
37 if (args.use_thin_pack)
39 argv[4] = "--thin";
40 memset(&po, 0, sizeof(po));
41 po.argv = argv;
42 po.in = -1;
43 po.out = fd;
44 po.git_cmd = 1;
45 if (start_command(&po))
46 die("git-pack-objects failed (%s)", strerror(errno));
47 /*
49 * We feed the pack-objects we just spawned with revision
50 * parameters by writing to the pipe.
51 */
52 while (refs) {
53 char buf[42];
54 if (!is_null_sha1(refs->old_sha1) &&
56 has_sha1_file(refs->old_sha1)) {
57 memcpy(buf + 1, sha1_to_hex(refs->old_sha1), 40);
58 buf[0] = '^';
59 buf[41] = '\n';
60 if (!write_or_whine(po.in, buf, 42,
61 "send-pack: send refs"))
62 break;
63 }
64 if (!is_null_sha1(refs->new_sha1)) {
65 memcpy(buf, sha1_to_hex(refs->new_sha1), 40);
66 buf[40] = '\n';
67 if (!write_or_whine(po.in, buf, 41,
68 "send-pack: send refs"))
69 break;
70 }
71 refs = refs->next;
72 }
73 if (finish_command(&po))
75 return error("pack-objects died with strange error");
76 return 0;
77}
78static void unmark_and_free(struct commit_list *list, unsigned int mark)
80{
81 while (list) {
82 struct commit_list *temp = list;
83 temp->item->object.flags &= ~mark;
84 list = temp->next;
85 free(temp);
86 }
87}
88static int ref_newer(const unsigned char *new_sha1,
90 const unsigned char *old_sha1)
91{
92 struct object *o;
93 struct commit *old, *new;
94 struct commit_list *list, *used;
95 int found = 0;
96 /* Both new and old must be commit-ish and new is descendant of
98 * old. Otherwise we require --force.
99 */
100 o = deref_tag(parse_object(old_sha1), NULL, 0);
101 if (!o || o->type != OBJ_COMMIT)
102 return 0;
103 old = (struct commit *) o;
104 o = deref_tag(parse_object(new_sha1), NULL, 0);
106 if (!o || o->type != OBJ_COMMIT)
107 return 0;
108 new = (struct commit *) o;
109 if (parse_commit(new) < 0)
111 return 0;
112 used = list = NULL;
114 commit_list_insert(new, &list);
115 while (list) {
116 new = pop_most_recent_commit(&list, 1);
117 commit_list_insert(new, &used);
118 if (new == old) {
119 found = 1;
120 break;
121 }
122 }
123 unmark_and_free(list, 1);
124 unmark_and_free(used, 1);
125 return found;
126}
127static struct ref *local_refs, **local_tail;
129static struct ref *remote_refs, **remote_tail;
130static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
132{
133 struct ref *ref;
134 int len = strlen(refname) + 1;
135 ref = xcalloc(1, sizeof(*ref) + len);
136 hashcpy(ref->new_sha1, sha1);
137 memcpy(ref->name, refname, len);
138 *local_tail = ref;
139 local_tail = &ref->next;
140 return 0;
141}
142static void get_local_heads(void)
144{
145 local_tail = &local_refs;
146 for_each_ref(one_local_ref, NULL);
147}
148static int receive_status(int in)
150{
151 char line[1000];
152 int ret = 0;
153 int len = packet_read_line(in, line, sizeof(line));
154 if (len < 10 || memcmp(line, "unpack ", 7)) {
155 fprintf(stderr, "did not receive status back\n");
156 return -1;
157 }
158 if (memcmp(line, "unpack ok\n", 10)) {
159 fputs(line, stderr);
160 ret = -1;
161 }
162 while (1) {
163 len = packet_read_line(in, line, sizeof(line));
164 if (!len)
165 break;
166 if (len < 3 ||
167 (memcmp(line, "ok", 2) && memcmp(line, "ng", 2))) {
168 fprintf(stderr, "protocol error: %s\n", line);
169 ret = -1;
170 break;
171 }
172 if (!memcmp(line, "ok", 2))
173 continue;
174 fputs(line, stderr);
175 ret = -1;
176 }
177 return ret;
178}
179static void update_tracking_ref(struct remote *remote, struct ref *ref)
181{
182 struct refspec rs;
183 int will_delete_ref;
184 rs.src = ref->name;
186 rs.dst = NULL;
187 if (!ref->peer_ref)
189 return;
190 will_delete_ref = is_null_sha1(ref->peer_ref->new_sha1);
192 if (!will_delete_ref &&
194 !hashcmp(ref->old_sha1, ref->peer_ref->new_sha1))
195 return;
196 if (!remote_find_tracking(remote, &rs)) {
198 if (args.verbose)
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 const char *prettify_ref(const char *name)
211{
212 return name + (
213 !prefixcmp(name, "refs/heads/") ? 11 :
214 !prefixcmp(name, "refs/tags/") ? 10 :
215 !prefixcmp(name, "refs/remotes/") ? 13 :
216 0);
217}
218#define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
220static int do_send_pack(int in, int out, struct remote *remote, const char *dest, int nr_refspec, const char **refspec)
222{
223 struct ref *ref;
224 int new_refs;
225 int ret = 0;
226 int ask_for_status_report = 0;
227 int allow_deleting_refs = 0;
228 int expect_status_report = 0;
229 int shown_dest = 0;
230 /* No funny business with the matcher */
232 remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
233 get_local_heads();
234 /* Does the other end support the reporting? */
236 if (server_supports("report-status"))
237 ask_for_status_report = 1;
238 if (server_supports("delete-refs"))
239 allow_deleting_refs = 1;
240 /* match them up */
242 if (!remote_tail)
243 remote_tail = &remote_refs;
244 if (match_refs(local_refs, remote_refs, &remote_tail,
245 nr_refspec, refspec, args.send_all))
246 return -1;
247 if (!remote_refs) {
249 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
250 "Perhaps you should specify a branch such as 'master'.\n");
251 return 0;
252 }
253 /*
255 * Finally, tell the other end!
256 */
257 new_refs = 0;
258 for (ref = remote_refs; ref; ref = ref->next) {
259 char old_hex[60], *new_hex;
260 int will_delete_ref;
261 const char *pretty_ref;
262 const char *pretty_peer;
263 if (!ref->peer_ref)
265 continue;
266 if (!shown_dest) {
268 fprintf(stderr, "To %s\n", dest);
269 shown_dest = 1;
270 }
271 pretty_ref = prettify_ref(ref->name);
273 pretty_peer = prettify_ref(ref->peer_ref->name);
274 will_delete_ref = is_null_sha1(ref->peer_ref->new_sha1);
276 if (will_delete_ref && !allow_deleting_refs) {
277 fprintf(stderr, " ! %-*s %s (remote does not support deleting refs)\n",
278 SUMMARY_WIDTH, "[rejected]", pretty_ref);
279 ret = -2;
280 continue;
281 }
282 if (!will_delete_ref &&
283 !hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
284 if (args.verbose)
285 fprintf(stderr, " = %-*s %s -> %s\n",
286 SUMMARY_WIDTH, "[up to date]",
287 pretty_peer, pretty_ref);
288 continue;
289 }
290 /* This part determines what can overwrite what.
292 * The rules are:
293 *
294 * (0) you can always use --force or +A:B notation to
295 * selectively force individual ref pairs.
296 *
297 * (1) if the old thing does not exist, it is OK.
298 *
299 * (2) if you do not have the old thing, you are not allowed
300 * to overwrite it; you would not know what you are losing
301 * otherwise.
302 *
303 * (3) if both new and old are commit-ish, and new is a
304 * descendant of old, it is OK.
305 *
306 * (4) regardless of all of the above, removing :B is
307 * always allowed.
308 */
309 if (!args.force_update &&
311 !will_delete_ref &&
312 !is_null_sha1(ref->old_sha1) &&
313 !ref->force) {
314 if (!has_sha1_file(ref->old_sha1) ||
315 !ref_newer(ref->peer_ref->new_sha1,
316 ref->old_sha1)) {
317 /* We do not have the remote ref, or
318 * we know that the remote ref is not
319 * an ancestor of what we are trying to
320 * push. Either way this can be losing
321 * commits at the remote end and likely
322 * we were not up to date to begin with.
323 */
324 fprintf(stderr, " ! %-*s %s -> %s (non-fast forward)\n",
325 SUMMARY_WIDTH, "[rejected]",
326 pretty_peer, pretty_ref);
327 ret = -2;
328 continue;
329 }
330 }
331 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
332 if (!will_delete_ref)
333 new_refs++;
334 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
335 new_hex = sha1_to_hex(ref->new_sha1);
336 if (!args.dry_run) {
338 if (ask_for_status_report) {
339 packet_write(out, "%s %s %s%c%s",
340 old_hex, new_hex, ref->name, 0,
341 "report-status");
342 ask_for_status_report = 0;
343 expect_status_report = 1;
344 }
345 else
346 packet_write(out, "%s %s %s",
347 old_hex, new_hex, ref->name);
348 }
349 if (will_delete_ref)
350 fprintf(stderr, " - %-*s %s\n",
351 SUMMARY_WIDTH, "[deleting]",
352 pretty_ref);
353 else if (is_null_sha1(ref->old_sha1)) {
354 const char *msg;
355 if (!prefixcmp(ref->name, "refs/tags/"))
357 msg = "[new tag]";
358 else
359 msg = "[new branch]";
360 fprintf(stderr, " * %-*s %s -> %s\n",
361 SUMMARY_WIDTH, msg,
362 pretty_peer, pretty_ref);
363 }
364 else {
365 char quickref[83];
366 char type = ' ';
367 const char *msg = "";
368 strcpy(quickref, find_unique_abbrev(ref->old_sha1, DEFAULT_ABBREV));
370 if (ref_newer(ref->peer_ref->new_sha1, ref->old_sha1))
371 strcat(quickref, "..");
372 else {
373 strcat(quickref, "...");
374 type = '+';
375 msg = " (forced update)";
376 }
377 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
378 fprintf(stderr, " %c %-*s %s -> %s%s\n",
380 type,
381 SUMMARY_WIDTH, quickref,
382 pretty_peer, pretty_ref,
383 msg);
384 }
385 }
386 packet_flush(out);
388 if (new_refs && !args.dry_run)
389 ret = pack_objects(out, remote_refs);
390 close(out);
391 if (expect_status_report) {
393 if (receive_status(in))
394 ret = -4;
395 }
396 if (!args.dry_run && remote && ret == 0) {
398 for (ref = remote_refs; ref; ref = ref->next)
399 update_tracking_ref(remote, ref);
400 }
401 if (!new_refs && ret == 0)
403 fprintf(stderr, "Everything up-to-date\n");
404 return ret;
405}
406static void verify_remote_names(int nr_heads, const char **heads)
408{
409 int i;
410 for (i = 0; i < nr_heads; i++) {
412 const char *remote = strchr(heads[i], ':');
413 remote = remote ? (remote + 1) : heads[i];
415 switch (check_ref_format(remote)) {
416 case 0: /* ok */
417 case -2: /* ok but a single level -- that is fine for
418 * a match pattern.
419 */
420 case -3: /* ok but ends with a pattern-match character */
421 continue;
422 }
423 die("remote part of refspec is not a valid name in %s",
424 heads[i]);
425 }
426}
427int cmd_send_pack(int argc, const char **argv, const char *prefix)
429{
430 int i, nr_heads = 0;
431 const char **heads = NULL;
432 const char *remote_name = NULL;
433 struct remote *remote = NULL;
434 const char *dest = NULL;
435 argv++;
437 for (i = 1; i < argc; i++, argv++) {
438 const char *arg = *argv;
439 if (*arg == '-') {
441 if (!prefixcmp(arg, "--receive-pack=")) {
442 args.receivepack = arg + 15;
443 continue;
444 }
445 if (!prefixcmp(arg, "--exec=")) {
446 args.receivepack = arg + 7;
447 continue;
448 }
449 if (!prefixcmp(arg, "--remote=")) {
450 remote_name = arg + 9;
451 continue;
452 }
453 if (!strcmp(arg, "--all")) {
454 args.send_all = 1;
455 continue;
456 }
457 if (!strcmp(arg, "--dry-run")) {
458 args.dry_run = 1;
459 continue;
460 }
461 if (!strcmp(arg, "--force")) {
462 args.force_update = 1;
463 continue;
464 }
465 if (!strcmp(arg, "--verbose")) {
466 args.verbose = 1;
467 continue;
468 }
469 if (!strcmp(arg, "--thin")) {
470 args.use_thin_pack = 1;
471 continue;
472 }
473 usage(send_pack_usage);
474 }
475 if (!dest) {
476 dest = arg;
477 continue;
478 }
479 heads = (const char **) argv;
480 nr_heads = argc - i;
481 break;
482 }
483 if (!dest)
484 usage(send_pack_usage);
485 if (heads && args.send_all)
486 usage(send_pack_usage);
487 if (remote_name) {
489 remote = remote_get(remote_name);
490 if (!remote_has_url(remote, dest)) {
491 die("Destination %s is not a uri for %s",
492 dest, remote_name);
493 }
494 }
495 return send_pack(&args, dest, remote, nr_heads, heads);
497}
498int send_pack(struct send_pack_args *my_args,
500 const char *dest, struct remote *remote,
501 int nr_heads, const char **heads)
502{
503 int fd[2], ret;
504 struct child_process *conn;
505 memcpy(&args, my_args, sizeof(args));
507 verify_remote_names(nr_heads, heads);
509 conn = git_connect(fd, dest, args.receivepack, args.verbose ? CONNECT_VERBOSE : 0);
511 ret = do_send_pack(fd[0], fd[1], remote, dest, nr_heads, heads);
512 close(fd[0]);
513 close(fd[1]);
514 ret |= finish_connect(conn);
515 return !!ret;
516}