29cf73681f3caf0b91b0d7d11cafbfcd6c4bf8d0
1#include "cache.h"
2#include "commit.h"
3#include "tag.h"
4#include "refs.h"
5#include "pkt-line.h"
6#include "exec_cmd.h"
7static const char send_pack_usage[] =
9"git-send-pack [--all] [--exec=git-receive-pack] <remote> [<head>...]\n"
10" --all and explicit <head> specification are mutually exclusive.";
11static const char *exec = "git-receive-pack";
12static int verbose;
13static int send_all;
14static int force_update;
15static int use_thin_pack;
16static void exec_pack_objects(void)
18{
19 static const char *args[] = {
20 "pack-objects",
21 "--all-progress",
22 "--stdout",
23 NULL
24 };
25 execv_git_cmd(args);
26 die("git-pack-objects exec failed (%s)", strerror(errno));
27}
28static void exec_rev_list(struct ref *refs)
30{
31 static const char *args[4];
32 int i = 0;
33 args[i++] = "rev-list"; /* 0 */
35 if (use_thin_pack) /* 1 */
36 args[i++] = "--objects-edge";
37 else
38 args[i++] = "--objects";
39 args[i++] = "--stdin";
41 args[i] = NULL;
43 execv_git_cmd(args);
44 die("git-rev-list exec failed (%s)", strerror(errno));
45}
46/*
48 * Run "rev-list --stdin | pack-objects" pipe.
49 */
50static void rev_list(struct ref *refs)
51{
52 int pipe_fd[2];
53 pid_t pack_objects_pid;
54 if (pipe(pipe_fd) < 0)
56 die("rev-list setup: pipe failed");
57 pack_objects_pid = fork();
58 if (!pack_objects_pid) {
59 /* The child becomes pack-objects; reads from pipe
60 * and writes to the original fd
61 */
62 dup2(pipe_fd[0], 0);
63 close(pipe_fd[0]);
64 close(pipe_fd[1]);
65 exec_pack_objects();
66 die("pack-objects setup failed");
67 }
68 if (pack_objects_pid < 0)
69 die("pack-objects fork failed");
70 /* We become rev-list --stdin; output goes to pipe. */
72 dup2(pipe_fd[1], 1);
73 close(pipe_fd[0]);
74 close(pipe_fd[1]);
75 exec_rev_list(refs);
76}
77/*
79 * Create "rev-list --stdin | pack-objects" pipe and feed
80 * the refs into the pipeline.
81 */
82static void rev_list_generate(int fd, struct ref *refs)
83{
84 int pipe_fd[2];
85 pid_t rev_list_generate_pid;
86 if (pipe(pipe_fd) < 0)
88 die("rev-list-generate setup: pipe failed");
89 rev_list_generate_pid = fork();
90 if (!rev_list_generate_pid) {
91 /* The child becomes the "rev-list | pack-objects"
92 * pipeline. It takes input from us, and its output
93 * goes to fd.
94 */
95 dup2(pipe_fd[0], 0);
96 dup2(fd, 1);
97 close(pipe_fd[0]);
98 close(pipe_fd[1]);
99 close(fd);
100 rev_list(refs);
101 die("rev-list setup failed");
102 }
103 if (rev_list_generate_pid < 0)
104 die("rev-list-generate fork failed");
105 /* We feed the rev parameters to them. We do not write into
107 * fd nor read from the pipe.
108 */
109 close(pipe_fd[0]);
110 close(fd);
111 while (refs) {
112 char buf[42];
113 if (!is_null_sha1(refs->old_sha1) &&
115 has_sha1_file(refs->old_sha1)) {
116 memcpy(buf + 1, sha1_to_hex(refs->old_sha1), 40);
117 buf[0] = '^';
118 buf[41] = '\n';
119 write(pipe_fd[1], buf, 42);
120 }
121 if (!is_null_sha1(refs->new_sha1)) {
122 memcpy(buf, sha1_to_hex(refs->new_sha1), 40);
123 buf[40] = '\n';
124 write(pipe_fd[1], buf, 41);
125 }
126 refs = refs->next;
127 }
128 close(pipe_fd[1]);
129 // waitpid(rev_list_generate_pid);
130 exit(0);
131}
132/*
134 * Make a pack stream and spit it out into file descriptor fd
135 */
136static void pack_objects(int fd, struct ref *refs)
137{
138 pid_t rev_list_pid;
139 rev_list_pid = fork();
141 if (!rev_list_pid) {
142 rev_list_generate(fd, refs);
143 die("rev-list setup failed");
144 }
145 if (rev_list_pid < 0)
146 die("rev-list fork failed");
147 /*
148 * We don't wait for the rev-list pipeline in the parent:
149 * we end up waiting for the other end instead
150 */
151}
152static void unmark_and_free(struct commit_list *list, unsigned int mark)
154{
155 while (list) {
156 struct commit_list *temp = list;
157 temp->item->object.flags &= ~mark;
158 list = temp->next;
159 free(temp);
160 }
161}
162static int ref_newer(const unsigned char *new_sha1,
164 const unsigned char *old_sha1)
165{
166 struct object *o;
167 struct commit *old, *new;
168 struct commit_list *list, *used;
169 int found = 0;
170 /* Both new and old must be commit-ish and new is descendant of
172 * old. Otherwise we require --force.
173 */
174 o = deref_tag(parse_object(old_sha1), NULL, 0);
175 if (!o || o->type != OBJ_COMMIT)
176 return 0;
177 old = (struct commit *) o;
178 o = deref_tag(parse_object(new_sha1), NULL, 0);
180 if (!o || o->type != OBJ_COMMIT)
181 return 0;
182 new = (struct commit *) o;
183 if (parse_commit(new) < 0)
185 return 0;
186 used = list = NULL;
188 commit_list_insert(new, &list);
189 while (list) {
190 new = pop_most_recent_commit(&list, 1);
191 commit_list_insert(new, &used);
192 if (new == old) {
193 found = 1;
194 break;
195 }
196 }
197 unmark_and_free(list, 1);
198 unmark_and_free(used, 1);
199 return found;
200}
201static struct ref *local_refs, **local_tail;
203static struct ref *remote_refs, **remote_tail;
204static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
206{
207 struct ref *ref;
208 int len = strlen(refname) + 1;
209 ref = xcalloc(1, sizeof(*ref) + len);
210 hashcpy(ref->new_sha1, sha1);
211 memcpy(ref->name, refname, len);
212 *local_tail = ref;
213 local_tail = &ref->next;
214 return 0;
215}
216static void get_local_heads(void)
218{
219 local_tail = &local_refs;
220 for_each_ref(one_local_ref, NULL);
221}
222static int receive_status(int in)
224{
225 char line[1000];
226 int ret = 0;
227 int len = packet_read_line(in, line, sizeof(line));
228 if (len < 10 || memcmp(line, "unpack ", 7)) {
229 fprintf(stderr, "did not receive status back\n");
230 return -1;
231 }
232 if (memcmp(line, "unpack ok\n", 10)) {
233 fputs(line, stderr);
234 ret = -1;
235 }
236 while (1) {
237 len = packet_read_line(in, line, sizeof(line));
238 if (!len)
239 break;
240 if (len < 3 ||
241 (memcmp(line, "ok", 2) && memcmp(line, "ng", 2))) {
242 fprintf(stderr, "protocol error: %s\n", line);
243 ret = -1;
244 break;
245 }
246 if (!memcmp(line, "ok", 2))
247 continue;
248 fputs(line, stderr);
249 ret = -1;
250 }
251 return ret;
252}
253static int send_pack(int in, int out, int nr_refspec, char **refspec)
255{
256 struct ref *ref;
257 int new_refs;
258 int ret = 0;
259 int ask_for_status_report = 0;
260 int allow_deleting_refs = 0;
261 int expect_status_report = 0;
262 /* No funny business with the matcher */
264 remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
265 get_local_heads();
266 /* Does the other end support the reporting? */
268 if (server_supports("report-status"))
269 ask_for_status_report = 1;
270 if (server_supports("delete-refs"))
271 allow_deleting_refs = 1;
272 /* match them up */
274 if (!remote_tail)
275 remote_tail = &remote_refs;
276 if (match_refs(local_refs, remote_refs, &remote_tail,
277 nr_refspec, refspec, send_all))
278 return -1;
279 if (!remote_refs) {
281 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
282 return 0;
283 }
284 /*
286 * Finally, tell the other end!
287 */
288 new_refs = 0;
289 for (ref = remote_refs; ref; ref = ref->next) {
290 char old_hex[60], *new_hex;
291 int delete_ref;
292 if (!ref->peer_ref)
294 continue;
295 delete_ref = is_null_sha1(ref->peer_ref->new_sha1);
297 if (delete_ref && !allow_deleting_refs) {
298 error("remote does not support deleting refs");
299 ret = -2;
300 continue;
301 }
302 if (!delete_ref &&
303 !hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
304 if (verbose)
305 fprintf(stderr, "'%s': up-to-date\n", ref->name);
306 continue;
307 }
308 /* This part determines what can overwrite what.
310 * The rules are:
311 *
312 * (0) you can always use --force or +A:B notation to
313 * selectively force individual ref pairs.
314 *
315 * (1) if the old thing does not exist, it is OK.
316 *
317 * (2) if you do not have the old thing, you are not allowed
318 * to overwrite it; you would not know what you are losing
319 * otherwise.
320 *
321 * (3) if both new and old are commit-ish, and new is a
322 * descendant of old, it is OK.
323 *
324 * (4) regardless of all of the above, removing :B is
325 * always allowed.
326 */
327 if (!force_update &&
329 !delete_ref &&
330 !is_null_sha1(ref->old_sha1) &&
331 !ref->force) {
332 if (!has_sha1_file(ref->old_sha1) ||
333 !ref_newer(ref->peer_ref->new_sha1,
334 ref->old_sha1)) {
335 /* We do not have the remote ref, or
336 * we know that the remote ref is not
337 * an ancestor of what we are trying to
338 * push. Either way this can be losing
339 * commits at the remote end and likely
340 * we were not up to date to begin with.
341 */
342 error("remote '%s' is not a strict "
343 "subset of local ref '%s'. "
344 "maybe you are not up-to-date and "
345 "need to pull first?",
346 ref->name,
347 ref->peer_ref->name);
348 ret = -2;
349 continue;
350 }
351 }
352 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
353 if (!delete_ref)
354 new_refs++;
355 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
356 new_hex = sha1_to_hex(ref->new_sha1);
357 if (ask_for_status_report) {
359 packet_write(out, "%s %s %s%c%s",
360 old_hex, new_hex, ref->name, 0,
361 "report-status");
362 ask_for_status_report = 0;
363 expect_status_report = 1;
364 }
365 else
366 packet_write(out, "%s %s %s",
367 old_hex, new_hex, ref->name);
368 if (delete_ref)
369 fprintf(stderr, "deleting '%s'\n", ref->name);
370 else {
371 fprintf(stderr, "updating '%s'", ref->name);
372 if (strcmp(ref->name, ref->peer_ref->name))
373 fprintf(stderr, " using '%s'",
374 ref->peer_ref->name);
375 fprintf(stderr, "\n from %s\n to %s\n",
376 old_hex, new_hex);
377 }
378 }
379 packet_flush(out);
381 if (new_refs)
382 pack_objects(out, remote_refs);
383 close(out);
384 if (expect_status_report) {
386 if (receive_status(in))
387 ret = -4;
388 }
389 if (!new_refs && ret == 0)
391 fprintf(stderr, "Everything up-to-date\n");
392 return ret;
393}
394static void verify_remote_names(int nr_heads, char **heads)
396{
397 int i;
398 for (i = 0; i < nr_heads; i++) {
400 const char *remote = strchr(heads[i], ':');
401 remote = remote ? (remote + 1) : heads[i];
403 switch (check_ref_format(remote)) {
404 case 0: /* ok */
405 case -2: /* ok but a single level -- that is fine for
406 * a match pattern.
407 */
408 continue;
409 }
410 die("remote part of refspec is not a valid name in %s",
411 heads[i]);
412 }
413}
414int main(int argc, char **argv)
416{
417 int i, nr_heads = 0;
418 char *dest = NULL;
419 char **heads = NULL;
420 int fd[2], ret;
421 pid_t pid;
422 setup_git_directory();
424 git_config(git_default_config);
425 argv++;
427 for (i = 1; i < argc; i++, argv++) {
428 char *arg = *argv;
429 if (*arg == '-') {
431 if (!strncmp(arg, "--exec=", 7)) {
432 exec = arg + 7;
433 continue;
434 }
435 if (!strcmp(arg, "--all")) {
436 send_all = 1;
437 continue;
438 }
439 if (!strcmp(arg, "--force")) {
440 force_update = 1;
441 continue;
442 }
443 if (!strcmp(arg, "--verbose")) {
444 verbose = 1;
445 continue;
446 }
447 if (!strcmp(arg, "--thin")) {
448 use_thin_pack = 1;
449 continue;
450 }
451 usage(send_pack_usage);
452 }
453 if (!dest) {
454 dest = arg;
455 continue;
456 }
457 heads = argv;
458 nr_heads = argc - i;
459 break;
460 }
461 if (!dest)
462 usage(send_pack_usage);
463 if (heads && send_all)
464 usage(send_pack_usage);
465 verify_remote_names(nr_heads, heads);
466 pid = git_connect(fd, dest, exec);
468 if (pid < 0)
469 return 1;
470 ret = send_pack(fd[0], fd[1], nr_heads, heads);
471 close(fd[0]);
472 close(fd[1]);
473 ret |= finish_connect(pid);
474 return !!ret;
475}