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Commit | Line | Data |
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61221472 | 1 | #include "cache.h" |
2a9c3fe8 | 2 | #include "commit.h" |
37fde874 | 3 | #include "tag.h" |
584c6cc9 | 4 | #include "refs.h" |
f3a3214e | 5 | #include "pkt-line.h" |
61221472 | 6 | |
2a245013 | 7 | static const char send_pack_usage[] = |
0bc3cdfc JH |
8 | "git-send-pack [--all] [--exec=git-receive-pack] <remote> [<head>...]\n" |
9 | " --all and explicit <head> specification are mutually exclusive."; | |
61221472 | 10 | static const char *exec = "git-receive-pack"; |
d089391c | 11 | static int send_all = 0; |
2a9c3fe8 | 12 | static int force_update = 0; |
61221472 | 13 | |
584c6cc9 LT |
14 | static int is_zero_sha1(const unsigned char *sha1) |
15 | { | |
16 | int i; | |
17 | ||
18 | for (i = 0; i < 20; i++) { | |
19 | if (*sha1++) | |
20 | return 0; | |
21 | } | |
22 | return 1; | |
23 | } | |
24 | ||
94fdb7aa LT |
25 | static void exec_pack_objects(void) |
26 | { | |
27 | static char *args[] = { | |
28 | "git-pack-objects", | |
29 | "--stdout", | |
30 | NULL | |
31 | }; | |
32 | execvp("git-pack-objects", args); | |
33 | die("git-pack-objects exec failed (%s)", strerror(errno)); | |
34 | } | |
35 | ||
36 | static void exec_rev_list(struct ref *refs) | |
37 | { | |
38 | static char *args[1000]; | |
39 | int i = 0; | |
40 | ||
41 | args[i++] = "git-rev-list"; /* 0 */ | |
42 | args[i++] = "--objects"; /* 1 */ | |
43 | while (refs) { | |
44 | char *buf = malloc(100); | |
45 | if (i > 900) | |
46 | die("git-rev-list environment overflow"); | |
40b64d47 JH |
47 | if (!is_zero_sha1(refs->old_sha1) && |
48 | has_sha1_file(refs->old_sha1)) { | |
584c6cc9 LT |
49 | args[i++] = buf; |
50 | snprintf(buf, 50, "^%s", sha1_to_hex(refs->old_sha1)); | |
51 | buf += 50; | |
52 | } | |
53 | if (!is_zero_sha1(refs->new_sha1)) { | |
54 | args[i++] = buf; | |
55 | snprintf(buf, 50, "%s", sha1_to_hex(refs->new_sha1)); | |
56 | } | |
94fdb7aa LT |
57 | refs = refs->next; |
58 | } | |
59 | args[i] = NULL; | |
60 | execvp("git-rev-list", args); | |
61 | die("git-rev-list exec failed (%s)", strerror(errno)); | |
62 | } | |
63 | ||
64 | static void rev_list(int fd, struct ref *refs) | |
65 | { | |
66 | int pipe_fd[2]; | |
67 | pid_t pack_objects_pid; | |
68 | ||
69 | if (pipe(pipe_fd) < 0) | |
70 | die("rev-list setup: pipe failed"); | |
71 | pack_objects_pid = fork(); | |
72 | if (!pack_objects_pid) { | |
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 | dup2(pipe_fd[1], 1); | |
84 | close(pipe_fd[0]); | |
85 | close(pipe_fd[1]); | |
86 | close(fd); | |
87 | exec_rev_list(refs); | |
88 | } | |
89 | ||
90 | static int pack_objects(int fd, struct ref *refs) | |
91 | { | |
92 | pid_t rev_list_pid; | |
93 | ||
94 | rev_list_pid = fork(); | |
95 | if (!rev_list_pid) { | |
96 | rev_list(fd, refs); | |
97 | die("rev-list setup failed"); | |
98 | } | |
99 | if (rev_list_pid < 0) | |
100 | die("rev-list fork failed"); | |
101 | /* | |
102 | * We don't wait for the rev-list pipeline in the parent: | |
103 | * we end up waiting for the other end instead | |
104 | */ | |
7ec4e608 | 105 | return 0; |
94fdb7aa | 106 | } |
e4b5c7ff | 107 | |
51b0fca0 JH |
108 | static void unmark_and_free(struct commit_list *list, unsigned int mark) |
109 | { | |
110 | while (list) { | |
111 | struct commit_list *temp = list; | |
112 | temp->item->object.flags &= ~mark; | |
113 | list = temp->next; | |
114 | free(temp); | |
115 | } | |
116 | } | |
117 | ||
37fde874 JH |
118 | static int ref_newer(const unsigned char *new_sha1, |
119 | const unsigned char *old_sha1) | |
584c6cc9 | 120 | { |
37fde874 JH |
121 | struct object *o; |
122 | struct commit *old, *new; | |
51b0fca0 JH |
123 | struct commit_list *list, *used; |
124 | int found = 0; | |
2a9c3fe8 | 125 | |
37fde874 JH |
126 | /* Both new and old must be commit-ish and new is descendant of |
127 | * old. Otherwise we require --force. | |
128 | */ | |
129 | o = deref_tag(parse_object(old_sha1)); | |
130 | if (!o || o->type != commit_type) | |
584c6cc9 | 131 | return 0; |
37fde874 JH |
132 | old = (struct commit *) o; |
133 | ||
134 | o = deref_tag(parse_object(new_sha1)); | |
135 | if (!o || o->type != commit_type) | |
2a9c3fe8 | 136 | return 0; |
37fde874 JH |
137 | new = (struct commit *) o; |
138 | ||
2a9c3fe8 LT |
139 | if (parse_commit(new) < 0) |
140 | return 0; | |
51b0fca0 JH |
141 | |
142 | used = list = NULL; | |
2a9c3fe8 | 143 | commit_list_insert(new, &list); |
bdf25142 LT |
144 | while (list) { |
145 | new = pop_most_recent_commit(&list, 1); | |
51b0fca0 JH |
146 | commit_list_insert(new, &used); |
147 | if (new == old) { | |
148 | found = 1; | |
149 | break; | |
150 | } | |
2a9c3fe8 | 151 | } |
51b0fca0 JH |
152 | unmark_and_free(list, 1); |
153 | unmark_and_free(used, 1); | |
154 | return found; | |
584c6cc9 LT |
155 | } |
156 | ||
f88395ac JH |
157 | static struct ref *local_refs, **local_tail; |
158 | static struct ref *remote_refs, **remote_tail; | |
584c6cc9 | 159 | |
f88395ac | 160 | static int one_local_ref(const char *refname, const unsigned char *sha1) |
584c6cc9 LT |
161 | { |
162 | struct ref *ref; | |
f88395ac JH |
163 | int len = strlen(refname) + 1; |
164 | ref = xcalloc(1, sizeof(*ref) + len); | |
584c6cc9 LT |
165 | memcpy(ref->new_sha1, sha1, 20); |
166 | memcpy(ref->name, refname, len); | |
f88395ac JH |
167 | *local_tail = ref; |
168 | local_tail = &ref->next; | |
584c6cc9 LT |
169 | return 0; |
170 | } | |
171 | ||
f88395ac JH |
172 | static void get_local_heads(void) |
173 | { | |
174 | local_tail = &local_refs; | |
175 | for_each_ref(one_local_ref); | |
176 | } | |
177 | ||
178 | static int send_pack(int in, int out, int nr_refspec, char **refspec) | |
61221472 | 179 | { |
7f8e9828 | 180 | struct ref *ref; |
584c6cc9 | 181 | int new_refs; |
7f8e9828 | 182 | |
f88395ac JH |
183 | /* No funny business with the matcher */ |
184 | remote_tail = get_remote_heads(in, &remote_refs, 0, NULL); | |
185 | get_local_heads(); | |
584c6cc9 | 186 | |
f88395ac JH |
187 | /* match them up */ |
188 | if (!remote_tail) | |
189 | remote_tail = &remote_refs; | |
190 | if (match_refs(local_refs, remote_refs, &remote_tail, | |
191 | nr_refspec, refspec, send_all)) | |
192 | return -1; | |
584c6cc9 | 193 | /* |
f88395ac | 194 | * Finally, tell the other end! |
584c6cc9 | 195 | */ |
f88395ac JH |
196 | new_refs = 0; |
197 | for (ref = remote_refs; ref; ref = ref->next) { | |
198 | char old_hex[60], *new_hex; | |
199 | if (!ref->peer_ref) | |
7f8e9828 | 200 | continue; |
37fde874 JH |
201 | if (!memcmp(ref->old_sha1, ref->peer_ref->new_sha1, 20)) { |
202 | fprintf(stderr, "'%s': up-to-date\n", ref->name); | |
203 | continue; | |
204 | } | |
205 | ||
206 | /* This part determines what can overwrite what. | |
207 | * The rules are: | |
208 | * | |
ff27adf3 JH |
209 | * (0) you can always use --force or +A:B notation to |
210 | * selectively force individual ref pairs. | |
37fde874 JH |
211 | * |
212 | * (1) if the old thing does not exist, it is OK. | |
213 | * | |
214 | * (2) if you do not have the old thing, you are not allowed | |
215 | * to overwrite it; you would not know what you are losing | |
216 | * otherwise. | |
217 | * | |
218 | * (3) if both new and old are commit-ish, and new is a | |
219 | * descendant of old, it is OK. | |
220 | */ | |
221 | ||
ff27adf3 JH |
222 | if (!force_update && |
223 | !is_zero_sha1(ref->old_sha1) && | |
224 | !ref->force) { | |
f88395ac JH |
225 | if (!has_sha1_file(ref->old_sha1)) { |
226 | error("remote '%s' object %s does not " | |
227 | "exist on local", | |
228 | ref->name, sha1_to_hex(ref->old_sha1)); | |
229 | continue; | |
230 | } | |
ff27adf3 | 231 | |
37fde874 | 232 | /* We assume that local is fsck-clean. Otherwise |
ff27adf3 JH |
233 | * you _could_ have an old tag which points at |
234 | * something you do not have, which may or may not | |
37fde874 JH |
235 | * be a commit. |
236 | */ | |
f88395ac JH |
237 | if (!ref_newer(ref->peer_ref->new_sha1, |
238 | ref->old_sha1)) { | |
239 | error("remote ref '%s' is not a strict " | |
240 | "subset of local ref '%s'.", ref->name, | |
241 | ref->peer_ref->name); | |
242 | continue; | |
243 | } | |
e4b5c7ff | 244 | } |
f88395ac JH |
245 | memcpy(ref->new_sha1, ref->peer_ref->new_sha1, 20); |
246 | if (is_zero_sha1(ref->new_sha1)) { | |
247 | error("cannot happen anymore"); | |
584c6cc9 LT |
248 | continue; |
249 | } | |
584c6cc9 | 250 | new_refs++; |
7f8e9828 LT |
251 | strcpy(old_hex, sha1_to_hex(ref->old_sha1)); |
252 | new_hex = sha1_to_hex(ref->new_sha1); | |
253 | packet_write(out, "%s %s %s", old_hex, new_hex, ref->name); | |
f88395ac JH |
254 | fprintf(stderr, "updating '%s'", ref->name); |
255 | if (strcmp(ref->name, ref->peer_ref->name)) | |
256 | fprintf(stderr, " using '%s'", ref->peer_ref->name); | |
257 | fprintf(stderr, "\n from %s\n to %s\n", old_hex, new_hex); | |
61221472 | 258 | } |
f88395ac | 259 | |
f3a3214e | 260 | packet_flush(out); |
584c6cc9 | 261 | if (new_refs) |
f88395ac | 262 | pack_objects(out, remote_refs); |
61221472 LT |
263 | close(out); |
264 | return 0; | |
265 | } | |
266 | ||
f88395ac | 267 | |
61221472 LT |
268 | int main(int argc, char **argv) |
269 | { | |
270 | int i, nr_heads = 0; | |
271 | char *dest = NULL; | |
272 | char **heads = NULL; | |
7f8e9828 LT |
273 | int fd[2], ret; |
274 | pid_t pid; | |
61221472 LT |
275 | |
276 | argv++; | |
d089391c LT |
277 | for (i = 1; i < argc; i++, argv++) { |
278 | char *arg = *argv; | |
61221472 LT |
279 | |
280 | if (*arg == '-') { | |
281 | if (!strncmp(arg, "--exec=", 7)) { | |
282 | exec = arg + 7; | |
283 | continue; | |
284 | } | |
d089391c LT |
285 | if (!strcmp(arg, "--all")) { |
286 | send_all = 1; | |
287 | continue; | |
288 | } | |
2a9c3fe8 LT |
289 | if (!strcmp(arg, "--force")) { |
290 | force_update = 1; | |
291 | continue; | |
292 | } | |
61221472 LT |
293 | usage(send_pack_usage); |
294 | } | |
d089391c LT |
295 | if (!dest) { |
296 | dest = arg; | |
297 | continue; | |
298 | } | |
61221472 | 299 | heads = argv; |
d089391c | 300 | nr_heads = argc - i; |
61221472 LT |
301 | break; |
302 | } | |
303 | if (!dest) | |
304 | usage(send_pack_usage); | |
0bc3cdfc JH |
305 | if (heads && send_all) |
306 | usage(send_pack_usage); | |
f7192598 | 307 | pid = git_connect(fd, dest, exec); |
7f8e9828 | 308 | if (pid < 0) |
61221472 | 309 | return 1; |
d0efc8a7 | 310 | ret = send_pack(fd[0], fd[1], nr_heads, heads); |
7f8e9828 LT |
311 | close(fd[0]); |
312 | close(fd[1]); | |
f7192598 | 313 | finish_connect(pid); |
7f8e9828 | 314 | return ret; |
61221472 | 315 | } |