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 fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
199 if (is_null_sha1(ref->peer_ref->new_sha1)) {
200 if (delete_ref(rs.dst, NULL))
201 error("Failed to delete");
202 } else
203 update_ref("update by push", rs.dst,
204 ref->new_sha1, NULL, 0, 0);
205 free(rs.dst);
206 }
207}
208static int do_send_pack(int in, int out, struct remote *remote, int nr_refspec, const char **refspec)
210{
211 struct ref *ref;
212 int new_refs;
213 int ret = 0;
214 int ask_for_status_report = 0;
215 int allow_deleting_refs = 0;
216 int expect_status_report = 0;
217 /* No funny business with the matcher */
219 remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
220 get_local_heads();
221 /* Does the other end support the reporting? */
223 if (server_supports("report-status"))
224 ask_for_status_report = 1;
225 if (server_supports("delete-refs"))
226 allow_deleting_refs = 1;
227 /* match them up */
229 if (!remote_tail)
230 remote_tail = &remote_refs;
231 if (match_refs(local_refs, remote_refs, &remote_tail,
232 nr_refspec, refspec, args.send_all))
233 return -1;
234 if (!remote_refs) {
236 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
237 "Perhaps you should specify a branch such as 'master'.\n");
238 return 0;
239 }
240 /*
242 * Finally, tell the other end!
243 */
244 new_refs = 0;
245 for (ref = remote_refs; ref; ref = ref->next) {
246 char old_hex[60], *new_hex;
247 int will_delete_ref;
248 if (!ref->peer_ref)
250 continue;
251 will_delete_ref = is_null_sha1(ref->peer_ref->new_sha1);
254 if (will_delete_ref && !allow_deleting_refs) {
255 error("remote does not support deleting refs");
256 ret = -2;
257 continue;
258 }
259 if (!will_delete_ref &&
260 !hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
261 if (args.verbose)
262 fprintf(stderr, "'%s': up-to-date\n", ref->name);
263 continue;
264 }
265 /* This part determines what can overwrite what.
267 * The rules are:
268 *
269 * (0) you can always use --force or +A:B notation to
270 * selectively force individual ref pairs.
271 *
272 * (1) if the old thing does not exist, it is OK.
273 *
274 * (2) if you do not have the old thing, you are not allowed
275 * to overwrite it; you would not know what you are losing
276 * otherwise.
277 *
278 * (3) if both new and old are commit-ish, and new is a
279 * descendant of old, it is OK.
280 *
281 * (4) regardless of all of the above, removing :B is
282 * always allowed.
283 */
284 if (!args.force_update &&
286 !will_delete_ref &&
287 !is_null_sha1(ref->old_sha1) &&
288 !ref->force) {
289 if (!has_sha1_file(ref->old_sha1) ||
290 !ref_newer(ref->peer_ref->new_sha1,
291 ref->old_sha1)) {
292 /* We do not have the remote ref, or
293 * we know that the remote ref is not
294 * an ancestor of what we are trying to
295 * push. Either way this can be losing
296 * commits at the remote end and likely
297 * we were not up to date to begin with.
298 */
299 error("remote '%s' is not a strict "
300 "subset of local ref '%s'. "
301 "maybe you are not up-to-date and "
302 "need to pull first?",
303 ref->name,
304 ref->peer_ref->name);
305 ret = -2;
306 continue;
307 }
308 }
309 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
310 if (!will_delete_ref)
311 new_refs++;
312 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
313 new_hex = sha1_to_hex(ref->new_sha1);
314 if (!args.dry_run) {
316 if (ask_for_status_report) {
317 packet_write(out, "%s %s %s%c%s",
318 old_hex, new_hex, ref->name, 0,
319 "report-status");
320 ask_for_status_report = 0;
321 expect_status_report = 1;
322 }
323 else
324 packet_write(out, "%s %s %s",
325 old_hex, new_hex, ref->name);
326 }
327 if (will_delete_ref)
328 fprintf(stderr, "deleting '%s'\n", ref->name);
329 else {
330 fprintf(stderr, "updating '%s'", ref->name);
331 if (strcmp(ref->name, ref->peer_ref->name))
332 fprintf(stderr, " using '%s'",
333 ref->peer_ref->name);
334 fprintf(stderr, "\n from %s\n to %s\n",
335 old_hex, new_hex);
336 }
337 }
338 packet_flush(out);
340 if (new_refs && !args.dry_run)
341 ret = pack_objects(out, remote_refs);
342 close(out);
343 if (expect_status_report) {
345 if (receive_status(in))
346 ret = -4;
347 }
348 if (!args.dry_run && remote && ret == 0) {
350 for (ref = remote_refs; ref; ref = ref->next)
351 update_tracking_ref(remote, ref);
352 }
353 if (!new_refs && ret == 0)
355 fprintf(stderr, "Everything up-to-date\n");
356 return ret;
357}
358static void verify_remote_names(int nr_heads, const char **heads)
360{
361 int i;
362 for (i = 0; i < nr_heads; i++) {
364 const char *remote = strchr(heads[i], ':');
365 remote = remote ? (remote + 1) : heads[i];
367 switch (check_ref_format(remote)) {
368 case 0: /* ok */
369 case -2: /* ok but a single level -- that is fine for
370 * a match pattern.
371 */
372 case -3: /* ok but ends with a pattern-match character */
373 continue;
374 }
375 die("remote part of refspec is not a valid name in %s",
376 heads[i]);
377 }
378}
379int cmd_send_pack(int argc, const char **argv, const char *prefix)
381{
382 int i, nr_heads = 0;
383 const char **heads = NULL;
384 const char *remote_name = NULL;
385 struct remote *remote = NULL;
386 const char *dest = NULL;
387 argv++;
389 for (i = 1; i < argc; i++, argv++) {
390 const char *arg = *argv;
391 if (*arg == '-') {
393 if (!prefixcmp(arg, "--receive-pack=")) {
394 args.receivepack = arg + 15;
395 continue;
396 }
397 if (!prefixcmp(arg, "--exec=")) {
398 args.receivepack = arg + 7;
399 continue;
400 }
401 if (!prefixcmp(arg, "--remote=")) {
402 remote_name = arg + 9;
403 continue;
404 }
405 if (!strcmp(arg, "--all")) {
406 args.send_all = 1;
407 continue;
408 }
409 if (!strcmp(arg, "--dry-run")) {
410 args.dry_run = 1;
411 continue;
412 }
413 if (!strcmp(arg, "--force")) {
414 args.force_update = 1;
415 continue;
416 }
417 if (!strcmp(arg, "--verbose")) {
418 args.verbose = 1;
419 continue;
420 }
421 if (!strcmp(arg, "--thin")) {
422 args.use_thin_pack = 1;
423 continue;
424 }
425 usage(send_pack_usage);
426 }
427 if (!dest) {
428 dest = arg;
429 continue;
430 }
431 heads = (const char **) argv;
432 nr_heads = argc - i;
433 break;
434 }
435 if (!dest)
436 usage(send_pack_usage);
437 if (heads && args.send_all)
438 usage(send_pack_usage);
439 if (remote_name) {
441 remote = remote_get(remote_name);
442 if (!remote_has_url(remote, dest)) {
443 die("Destination %s is not a uri for %s",
444 dest, remote_name);
445 }
446 }
447 return send_pack(&args, dest, remote, nr_heads, heads);
449}
450int send_pack(struct send_pack_args *my_args,
452 const char *dest, struct remote *remote,
453 int nr_heads, const char **heads)
454{
455 int fd[2], ret;
456 struct child_process *conn;
457 memcpy(&args, my_args, sizeof(args));
459 verify_remote_names(nr_heads, heads);
461 conn = git_connect(fd, dest, args.receivepack, args.verbose ? CONNECT_VERBOSE : 0);
463 ret = do_send_pack(fd[0], fd[1], remote, nr_heads, heads);
464 close(fd[0]);
465 close(fd[1]);
466 ret |= finish_connect(conn);
467 return !!ret;
468}