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 int is_zero_sha1(const unsigned char *sha1)
18{
19 int i;
20 for (i = 0; i < 20; i++) {
22 if (*sha1++)
23 return 0;
24 }
25 return 1;
26}
27static void exec_pack_objects(void)
29{
30 static const char *args[] = {
31 "pack-objects",
32 "--all-progress",
33 "--stdout",
34 NULL
35 };
36 execv_git_cmd(args);
37 die("git-pack-objects exec failed (%s)", strerror(errno));
38}
39static void exec_rev_list(struct ref *refs)
41{
42 static const char *args[4];
43 int i = 0;
44 args[i++] = "rev-list"; /* 0 */
46 if (use_thin_pack) /* 1 */
47 args[i++] = "--objects-edge";
48 else
49 args[i++] = "--objects";
50 args[i++] = "--stdin";
52 args[i] = NULL;
54 execv_git_cmd(args);
55 die("git-rev-list exec failed (%s)", strerror(errno));
56}
57/*
59 * Run "rev-list --stdin | pack-objects" pipe.
60 */
61static void rev_list(int fd, struct ref *refs)
62{
63 int pipe_fd[2];
64 pid_t pack_objects_pid;
65 if (pipe(pipe_fd) < 0)
67 die("rev-list setup: pipe failed");
68 pack_objects_pid = fork();
69 if (!pack_objects_pid) {
70 /* The child becomes pack-objects; reads from pipe
71 * and writes to the original fd
72 */
73 dup2(pipe_fd[0], 0);
74 dup2(fd, 1);
75 close(pipe_fd[0]);
76 close(pipe_fd[1]);
77 close(fd);
78 exec_pack_objects();
79 die("pack-objects setup failed");
80 }
81 if (pack_objects_pid < 0)
82 die("pack-objects fork failed");
83 /* We become rev-list --stdin; output goes to pipe. */
85 dup2(pipe_fd[1], 1);
86 close(pipe_fd[0]);
87 close(pipe_fd[1]);
88 close(fd);
89 exec_rev_list(refs);
90}
91/*
93 * Create "rev-list --stdin | pack-objects" pipe and feed
94 * the refs into the pipeline.
95 */
96static void rev_list_generate(int fd, struct ref *refs)
97{
98 int pipe_fd[2];
99 pid_t rev_list_generate_pid;
100 if (pipe(pipe_fd) < 0)
102 die("rev-list-generate setup: pipe failed");
103 rev_list_generate_pid = fork();
104 if (!rev_list_generate_pid) {
105 /* The child becomes the "rev-list | pack-objects"
106 * pipeline. It takes input from us, and its output
107 * goes to fd.
108 */
109 dup2(pipe_fd[0], 0);
110 dup2(fd, 1);
111 close(pipe_fd[0]);
112 close(pipe_fd[1]);
113 close(fd);
114 rev_list(fd, refs);
115 die("rev-list setup failed");
116 }
117 if (rev_list_generate_pid < 0)
118 die("rev-list-generate fork failed");
119 /* We feed the rev parameters to them. We do not write into
121 * fd nor read from the pipe.
122 */
123 close(pipe_fd[0]);
124 close(fd);
125 while (refs) {
126 char buf[42];
127 if (!is_null_sha1(refs->old_sha1) &&
129 has_sha1_file(refs->old_sha1)) {
130 memcpy(buf + 1, sha1_to_hex(refs->old_sha1), 40);
131 buf[0] = '^';
132 buf[41] = '\n';
133 write(pipe_fd[1], buf, 42);
134 }
135 if (!is_null_sha1(refs->new_sha1)) {
136 memcpy(buf, sha1_to_hex(refs->new_sha1), 40);
137 buf[40] = '\n';
138 write(pipe_fd[1], buf, 41);
139 }
140 refs = refs->next;
141 }
142 close(pipe_fd[1]);
143 // waitpid(rev_list_generate_pid);
144 exit(0);
145}
146/*
148 * Make a pack stream and spit it out into file descriptor fd
149 */
150static void pack_objects(int fd, struct ref *refs)
151{
152 pid_t rev_list_pid;
153 rev_list_pid = fork();
155 if (!rev_list_pid) {
156 rev_list_generate(fd, refs);
157 die("rev-list setup failed");
158 }
159 if (rev_list_pid < 0)
160 die("rev-list fork failed");
161 /*
162 * We don't wait for the rev-list pipeline in the parent:
163 * we end up waiting for the other end instead
164 */
165}
166static void unmark_and_free(struct commit_list *list, unsigned int mark)
168{
169 while (list) {
170 struct commit_list *temp = list;
171 temp->item->object.flags &= ~mark;
172 list = temp->next;
173 free(temp);
174 }
175}
176static int ref_newer(const unsigned char *new_sha1,
178 const unsigned char *old_sha1)
179{
180 struct object *o;
181 struct commit *old, *new;
182 struct commit_list *list, *used;
183 int found = 0;
184 /* Both new and old must be commit-ish and new is descendant of
186 * old. Otherwise we require --force.
187 */
188 o = deref_tag(parse_object(old_sha1), NULL, 0);
189 if (!o || o->type != OBJ_COMMIT)
190 return 0;
191 old = (struct commit *) o;
192 o = deref_tag(parse_object(new_sha1), NULL, 0);
194 if (!o || o->type != OBJ_COMMIT)
195 return 0;
196 new = (struct commit *) o;
197 if (parse_commit(new) < 0)
199 return 0;
200 used = list = NULL;
202 commit_list_insert(new, &list);
203 while (list) {
204 new = pop_most_recent_commit(&list, 1);
205 commit_list_insert(new, &used);
206 if (new == old) {
207 found = 1;
208 break;
209 }
210 }
211 unmark_and_free(list, 1);
212 unmark_and_free(used, 1);
213 return found;
214}
215static struct ref *local_refs, **local_tail;
217static struct ref *remote_refs, **remote_tail;
218static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
220{
221 struct ref *ref;
222 int len = strlen(refname) + 1;
223 ref = xcalloc(1, sizeof(*ref) + len);
224 hashcpy(ref->new_sha1, sha1);
225 memcpy(ref->name, refname, len);
226 *local_tail = ref;
227 local_tail = &ref->next;
228 return 0;
229}
230static void get_local_heads(void)
232{
233 local_tail = &local_refs;
234 for_each_ref(one_local_ref, NULL);
235}
236static int receive_status(int in)
238{
239 char line[1000];
240 int ret = 0;
241 int len = packet_read_line(in, line, sizeof(line));
242 if (len < 10 || memcmp(line, "unpack ", 7)) {
243 fprintf(stderr, "did not receive status back\n");
244 return -1;
245 }
246 if (memcmp(line, "unpack ok\n", 10)) {
247 fputs(line, stderr);
248 ret = -1;
249 }
250 while (1) {
251 len = packet_read_line(in, line, sizeof(line));
252 if (!len)
253 break;
254 if (len < 3 ||
255 (memcmp(line, "ok", 2) && memcmp(line, "ng", 2))) {
256 fprintf(stderr, "protocol error: %s\n", line);
257 ret = -1;
258 break;
259 }
260 if (!memcmp(line, "ok", 2))
261 continue;
262 fputs(line, stderr);
263 ret = -1;
264 }
265 return ret;
266}
267static int send_pack(int in, int out, int nr_refspec, char **refspec)
269{
270 struct ref *ref;
271 int new_refs;
272 int ret = 0;
273 int ask_for_status_report = 0;
274 int allow_deleting_refs = 0;
275 int expect_status_report = 0;
276 /* No funny business with the matcher */
278 remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
279 get_local_heads();
280 /* Does the other end support the reporting? */
282 if (server_supports("report-status"))
283 ask_for_status_report = 1;
284 if (server_supports("delete-refs"))
285 allow_deleting_refs = 1;
286 /* match them up */
288 if (!remote_tail)
289 remote_tail = &remote_refs;
290 if (match_refs(local_refs, remote_refs, &remote_tail,
291 nr_refspec, refspec, send_all))
292 return -1;
293 if (!remote_refs) {
295 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
296 return 0;
297 }
298 /*
300 * Finally, tell the other end!
301 */
302 new_refs = 0;
303 for (ref = remote_refs; ref; ref = ref->next) {
304 char old_hex[60], *new_hex;
305 int delete_ref;
306 if (!ref->peer_ref)
308 continue;
309 delete_ref = is_null_sha1(ref->peer_ref->new_sha1);
311 if (delete_ref && !allow_deleting_refs) {
312 error("remote does not support deleting refs");
313 ret = -2;
314 continue;
315 }
316 if (!delete_ref &&
317 !hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
318 if (verbose)
319 fprintf(stderr, "'%s': up-to-date\n", ref->name);
320 continue;
321 }
322 /* This part determines what can overwrite what.
324 * The rules are:
325 *
326 * (0) you can always use --force or +A:B notation to
327 * selectively force individual ref pairs.
328 *
329 * (1) if the old thing does not exist, it is OK.
330 *
331 * (2) if you do not have the old thing, you are not allowed
332 * to overwrite it; you would not know what you are losing
333 * otherwise.
334 *
335 * (3) if both new and old are commit-ish, and new is a
336 * descendant of old, it is OK.
337 *
338 * (4) regardless of all of the above, removing :B is
339 * always allowed.
340 */
341 if (!force_update &&
343 !delete_ref &&
344 !is_zero_sha1(ref->old_sha1) &&
345 !ref->force) {
346 if (!has_sha1_file(ref->old_sha1) ||
347 !ref_newer(ref->peer_ref->new_sha1,
348 ref->old_sha1)) {
349 /* We do not have the remote ref, or
350 * we know that the remote ref is not
351 * an ancestor of what we are trying to
352 * push. Either way this can be losing
353 * commits at the remote end and likely
354 * we were not up to date to begin with.
355 */
356 error("remote '%s' is not a strict "
357 "subset of local ref '%s'. "
358 "maybe you are not up-to-date and "
359 "need to pull first?",
360 ref->name,
361 ref->peer_ref->name);
362 ret = -2;
363 continue;
364 }
365 }
366 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
367 if (!delete_ref)
368 new_refs++;
369 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
370 new_hex = sha1_to_hex(ref->new_sha1);
371 if (ask_for_status_report) {
373 packet_write(out, "%s %s %s%c%s",
374 old_hex, new_hex, ref->name, 0,
375 "report-status");
376 ask_for_status_report = 0;
377 expect_status_report = 1;
378 }
379 else
380 packet_write(out, "%s %s %s",
381 old_hex, new_hex, ref->name);
382 if (delete_ref)
383 fprintf(stderr, "deleting '%s'\n", ref->name);
384 else {
385 fprintf(stderr, "updating '%s'", ref->name);
386 if (strcmp(ref->name, ref->peer_ref->name))
387 fprintf(stderr, " using '%s'",
388 ref->peer_ref->name);
389 fprintf(stderr, "\n from %s\n to %s\n",
390 old_hex, new_hex);
391 }
392 }
393 packet_flush(out);
395 if (new_refs)
396 pack_objects(out, remote_refs);
397 close(out);
398 if (expect_status_report) {
400 if (receive_status(in))
401 ret = -4;
402 }
403 if (!new_refs && ret == 0)
405 fprintf(stderr, "Everything up-to-date\n");
406 return ret;
407}
408int main(int argc, char **argv)
411{
412 int i, nr_heads = 0;
413 char *dest = NULL;
414 char **heads = NULL;
415 int fd[2], ret;
416 pid_t pid;
417 setup_git_directory();
419 git_config(git_default_config);
420 argv++;
422 for (i = 1; i < argc; i++, argv++) {
423 char *arg = *argv;
424 if (*arg == '-') {
426 if (!strncmp(arg, "--exec=", 7)) {
427 exec = arg + 7;
428 continue;
429 }
430 if (!strcmp(arg, "--all")) {
431 send_all = 1;
432 continue;
433 }
434 if (!strcmp(arg, "--force")) {
435 force_update = 1;
436 continue;
437 }
438 if (!strcmp(arg, "--verbose")) {
439 verbose = 1;
440 continue;
441 }
442 if (!strcmp(arg, "--thin")) {
443 use_thin_pack = 1;
444 continue;
445 }
446 usage(send_pack_usage);
447 }
448 if (!dest) {
449 dest = arg;
450 continue;
451 }
452 heads = argv;
453 nr_heads = argc - i;
454 break;
455 }
456 if (!dest)
457 usage(send_pack_usage);
458 if (heads && send_all)
459 usage(send_pack_usage);
460 pid = git_connect(fd, dest, exec);
461 if (pid < 0)
462 return 1;
463 ret = send_pack(fd[0], fd[1], nr_heads, heads);
464 close(fd[0]);
465 close(fd[1]);
466 ret |= finish_connect(pid);
467 return !!ret;
468}