1#include "cache.h"
2#include "commit.h"
3#include "tag.h"
4#include "refs.h"
5#include "pkt-line.h"
6static const char send_pack_usage[] =
8"git-send-pack [--all] [--exec=git-receive-pack] <remote> [<head>...]\n"
9" --all and explicit <head> specification are mutually exclusive.";
10static const char *exec = "git-receive-pack";
11static int verbose = 0;
12static int send_all = 0;
13static int force_update = 0;
14static int is_zero_sha1(const unsigned char *sha1)
16{
17 int i;
18 for (i = 0; i < 20; i++) {
20 if (*sha1++)
21 return 0;
22 }
23 return 1;
24}
25static void exec_pack_objects(void)
27{
28 static char *args[] = {
29 "git-pack-objects",
30 "--stdout",
31 NULL
32 };
33 execvp("git-pack-objects", args);
34 die("git-pack-objects exec failed (%s)", strerror(errno));
35}
36static void exec_rev_list(struct ref *refs)
38{
39 static char *args[1000];
40 int i = 0;
41 args[i++] = "git-rev-list"; /* 0 */
43 args[i++] = "--objects"; /* 1 */
44 while (refs) {
45 char *buf = malloc(100);
46 if (i > 900)
47 die("git-rev-list environment overflow");
48 if (!is_zero_sha1(refs->old_sha1) &&
49 has_sha1_file(refs->old_sha1)) {
50 args[i++] = buf;
51 snprintf(buf, 50, "^%s", sha1_to_hex(refs->old_sha1));
52 buf += 50;
53 }
54 if (!is_zero_sha1(refs->new_sha1)) {
55 args[i++] = buf;
56 snprintf(buf, 50, "%s", sha1_to_hex(refs->new_sha1));
57 }
58 refs = refs->next;
59 }
60 args[i] = NULL;
61 execvp("git-rev-list", args);
62 die("git-rev-list exec failed (%s)", strerror(errno));
63}
64static void rev_list(int fd, struct ref *refs)
66{
67 int pipe_fd[2];
68 pid_t pack_objects_pid;
69 if (pipe(pipe_fd) < 0)
71 die("rev-list setup: pipe failed");
72 pack_objects_pid = fork();
73 if (!pack_objects_pid) {
74 dup2(pipe_fd[0], 0);
75 dup2(fd, 1);
76 close(pipe_fd[0]);
77 close(pipe_fd[1]);
78 close(fd);
79 exec_pack_objects();
80 die("pack-objects setup failed");
81 }
82 if (pack_objects_pid < 0)
83 die("pack-objects fork failed");
84 dup2(pipe_fd[1], 1);
85 close(pipe_fd[0]);
86 close(pipe_fd[1]);
87 close(fd);
88 exec_rev_list(refs);
89}
90static int pack_objects(int fd, struct ref *refs)
92{
93 pid_t rev_list_pid;
94 rev_list_pid = fork();
96 if (!rev_list_pid) {
97 rev_list(fd, refs);
98 die("rev-list setup failed");
99 }
100 if (rev_list_pid < 0)
101 die("rev-list fork failed");
102 /*
103 * We don't wait for the rev-list pipeline in the parent:
104 * we end up waiting for the other end instead
105 */
106 return 0;
107}
108static void unmark_and_free(struct commit_list *list, unsigned int mark)
110{
111 while (list) {
112 struct commit_list *temp = list;
113 temp->item->object.flags &= ~mark;
114 list = temp->next;
115 free(temp);
116 }
117}
118static int ref_newer(const unsigned char *new_sha1,
120 const unsigned char *old_sha1)
121{
122 struct object *o;
123 struct commit *old, *new;
124 struct commit_list *list, *used;
125 int found = 0;
126 /* Both new and old must be commit-ish and new is descendant of
128 * old. Otherwise we require --force.
129 */
130 o = deref_tag(parse_object(old_sha1), NULL, 0);
131 if (!o || o->type != commit_type)
132 return 0;
133 old = (struct commit *) o;
134 o = deref_tag(parse_object(new_sha1), NULL, 0);
136 if (!o || o->type != commit_type)
137 return 0;
138 new = (struct commit *) o;
139 if (parse_commit(new) < 0)
141 return 0;
142 used = list = NULL;
144 commit_list_insert(new, &list);
145 while (list) {
146 new = pop_most_recent_commit(&list, 1);
147 commit_list_insert(new, &used);
148 if (new == old) {
149 found = 1;
150 break;
151 }
152 }
153 unmark_and_free(list, 1);
154 unmark_and_free(used, 1);
155 return found;
156}
157static struct ref *local_refs, **local_tail;
159static struct ref *remote_refs, **remote_tail;
160static int one_local_ref(const char *refname, const unsigned char *sha1)
162{
163 struct ref *ref;
164 int len = strlen(refname) + 1;
165 ref = xcalloc(1, sizeof(*ref) + len);
166 memcpy(ref->new_sha1, sha1, 20);
167 memcpy(ref->name, refname, len);
168 *local_tail = ref;
169 local_tail = &ref->next;
170 return 0;
171}
172static void get_local_heads(void)
174{
175 local_tail = &local_refs;
176 for_each_ref(one_local_ref);
177}
178static int send_pack(int in, int out, int nr_refspec, char **refspec)
180{
181 struct ref *ref;
182 int new_refs;
183 int ret = 0;
184 /* No funny business with the matcher */
186 remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, 1);
187 get_local_heads();
188 /* match them up */
190 if (!remote_tail)
191 remote_tail = &remote_refs;
192 if (match_refs(local_refs, remote_refs, &remote_tail,
193 nr_refspec, refspec, send_all))
194 return -1;
195 if (!remote_refs) {
197 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
198 return 0;
199 }
200 /*
202 * Finally, tell the other end!
203 */
204 new_refs = 0;
205 for (ref = remote_refs; ref; ref = ref->next) {
206 char old_hex[60], *new_hex;
207 if (!ref->peer_ref)
208 continue;
209 if (!memcmp(ref->old_sha1, ref->peer_ref->new_sha1, 20)) {
210 if (verbose)
211 fprintf(stderr, "'%s': up-to-date\n", ref->name);
212 continue;
213 }
214 /* This part determines what can overwrite what.
216 * The rules are:
217 *
218 * (0) you can always use --force or +A:B notation to
219 * selectively force individual ref pairs.
220 *
221 * (1) if the old thing does not exist, it is OK.
222 *
223 * (2) if you do not have the old thing, you are not allowed
224 * to overwrite it; you would not know what you are losing
225 * otherwise.
226 *
227 * (3) if both new and old are commit-ish, and new is a
228 * descendant of old, it is OK.
229 */
230 if (!force_update &&
232 !is_zero_sha1(ref->old_sha1) &&
233 !ref->force) {
234 if (!has_sha1_file(ref->old_sha1) ||
235 !ref_newer(ref->peer_ref->new_sha1,
236 ref->old_sha1)) {
237 /* We do not have the remote ref, or
238 * we know that the remote ref is not
239 * an ancestor of what we are trying to
240 * push. Either way this can be losing
241 * commits at the remote end and likely
242 * we were not up to date to begin with.
243 */
244 error("remote '%s' is not a strict "
245 "subset of local ref '%s'. "
246 "maybe you are not up-to-date and "
247 "need to pull first?",
248 ref->name,
249 ref->peer_ref->name);
250 ret = -2;
251 continue;
252 }
253 }
254 memcpy(ref->new_sha1, ref->peer_ref->new_sha1, 20);
255 if (is_zero_sha1(ref->new_sha1)) {
256 error("cannot happen anymore");
257 ret = -3;
258 continue;
259 }
260 new_refs++;
261 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
262 new_hex = sha1_to_hex(ref->new_sha1);
263 packet_write(out, "%s %s %s", old_hex, new_hex, ref->name);
264 fprintf(stderr, "updating '%s'", ref->name);
265 if (strcmp(ref->name, ref->peer_ref->name))
266 fprintf(stderr, " using '%s'", ref->peer_ref->name);
267 fprintf(stderr, "\n from %s\n to %s\n", old_hex, new_hex);
268 }
269 packet_flush(out);
271 if (new_refs)
272 pack_objects(out, remote_refs);
273 else if (ret == 0)
274 fprintf(stderr, "Everything up-to-date\n");
275 close(out);
276 return ret;
277}
278int main(int argc, char **argv)
281{
282 int i, nr_heads = 0;
283 char *dest = NULL;
284 char **heads = NULL;
285 int fd[2], ret;
286 pid_t pid;
287 setup_git_directory();
289 argv++;
290 for (i = 1; i < argc; i++, argv++) {
291 char *arg = *argv;
292 if (*arg == '-') {
294 if (!strncmp(arg, "--exec=", 7)) {
295 exec = arg + 7;
296 continue;
297 }
298 if (!strcmp(arg, "--all")) {
299 send_all = 1;
300 continue;
301 }
302 if (!strcmp(arg, "--force")) {
303 force_update = 1;
304 continue;
305 }
306 if (!strcmp(arg, "--verbose")) {
307 verbose = 1;
308 continue;
309 }
310 usage(send_pack_usage);
311 }
312 if (!dest) {
313 dest = arg;
314 continue;
315 }
316 heads = argv;
317 nr_heads = argc - i;
318 break;
319 }
320 if (!dest)
321 usage(send_pack_usage);
322 if (heads && send_all)
323 usage(send_pack_usage);
324 pid = git_connect(fd, dest, exec);
325 if (pid < 0)
326 return 1;
327 ret = send_pack(fd[0], fd[1], nr_heads, heads);
328 close(fd[0]);
329 close(fd[1]);
330 finish_connect(pid);
331 return ret;
332}