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 = 0;
13static int send_all = 0;
14static int force_update = 0;
15static int use_thin_pack = 0;
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 char *args[] = {
31 "pack-objects",
32 "--stdout",
33 NULL
34 };
35 execv_git_cmd(args);
36 die("git-pack-objects exec failed (%s)", strerror(errno));
37}
38static void exec_rev_list(struct ref *refs)
40{
41 static char *args[1000];
42 int i = 0;
43 args[i++] = "rev-list"; /* 0 */
45 if (use_thin_pack) /* 1 */
46 args[i++] = "--objects-edge";
47 else
48 args[i++] = "--objects";
49 while (refs) {
50 char *buf = malloc(100);
51 if (i > 900)
52 die("git-rev-list environment overflow");
53 if (!is_zero_sha1(refs->old_sha1) &&
54 has_sha1_file(refs->old_sha1)) {
55 args[i++] = buf;
56 snprintf(buf, 50, "^%s", sha1_to_hex(refs->old_sha1));
57 buf += 50;
58 }
59 if (!is_zero_sha1(refs->new_sha1)) {
60 args[i++] = buf;
61 snprintf(buf, 50, "%s", sha1_to_hex(refs->new_sha1));
62 }
63 refs = refs->next;
64 }
65 args[i] = NULL;
66 execv_git_cmd(args);
67 die("git-rev-list exec failed (%s)", strerror(errno));
68}
69static void rev_list(int fd, struct ref *refs)
71{
72 int pipe_fd[2];
73 pid_t pack_objects_pid;
74 if (pipe(pipe_fd) < 0)
76 die("rev-list setup: pipe failed");
77 pack_objects_pid = fork();
78 if (!pack_objects_pid) {
79 dup2(pipe_fd[0], 0);
80 dup2(fd, 1);
81 close(pipe_fd[0]);
82 close(pipe_fd[1]);
83 close(fd);
84 exec_pack_objects();
85 die("pack-objects setup failed");
86 }
87 if (pack_objects_pid < 0)
88 die("pack-objects fork failed");
89 dup2(pipe_fd[1], 1);
90 close(pipe_fd[0]);
91 close(pipe_fd[1]);
92 close(fd);
93 exec_rev_list(refs);
94}
95static int pack_objects(int fd, struct ref *refs)
97{
98 pid_t rev_list_pid;
99 rev_list_pid = fork();
101 if (!rev_list_pid) {
102 rev_list(fd, refs);
103 die("rev-list setup failed");
104 }
105 if (rev_list_pid < 0)
106 die("rev-list fork failed");
107 /*
108 * We don't wait for the rev-list pipeline in the parent:
109 * we end up waiting for the other end instead
110 */
111 return 0;
112}
113static void unmark_and_free(struct commit_list *list, unsigned int mark)
115{
116 while (list) {
117 struct commit_list *temp = list;
118 temp->item->object.flags &= ~mark;
119 list = temp->next;
120 free(temp);
121 }
122}
123static int ref_newer(const unsigned char *new_sha1,
125 const unsigned char *old_sha1)
126{
127 struct object *o;
128 struct commit *old, *new;
129 struct commit_list *list, *used;
130 int found = 0;
131 /* Both new and old must be commit-ish and new is descendant of
133 * old. Otherwise we require --force.
134 */
135 o = deref_tag(parse_object(old_sha1), NULL, 0);
136 if (!o || o->type != commit_type)
137 return 0;
138 old = (struct commit *) o;
139 o = deref_tag(parse_object(new_sha1), NULL, 0);
141 if (!o || o->type != commit_type)
142 return 0;
143 new = (struct commit *) o;
144 if (parse_commit(new) < 0)
146 return 0;
147 used = list = NULL;
149 commit_list_insert(new, &list);
150 while (list) {
151 new = pop_most_recent_commit(&list, 1);
152 commit_list_insert(new, &used);
153 if (new == old) {
154 found = 1;
155 break;
156 }
157 }
158 unmark_and_free(list, 1);
159 unmark_and_free(used, 1);
160 return found;
161}
162static struct ref *local_refs, **local_tail;
164static struct ref *remote_refs, **remote_tail;
165static int one_local_ref(const char *refname, const unsigned char *sha1)
167{
168 struct ref *ref;
169 int len = strlen(refname) + 1;
170 ref = xcalloc(1, sizeof(*ref) + len);
171 memcpy(ref->new_sha1, sha1, 20);
172 memcpy(ref->name, refname, len);
173 *local_tail = ref;
174 local_tail = &ref->next;
175 return 0;
176}
177static void get_local_heads(void)
179{
180 local_tail = &local_refs;
181 for_each_ref(one_local_ref);
182}
183static int receive_status(int in)
185{
186 char line[1000];
187 int ret = 0;
188 int len = packet_read_line(in, line, sizeof(line));
189 if (len < 10 || memcmp(line, "unpack ", 7)) {
190 fprintf(stderr, "did not receive status back\n");
191 return -1;
192 }
193 if (memcmp(line, "unpack ok\n", 10)) {
194 fputs(line, stderr);
195 ret = -1;
196 }
197 while (1) {
198 len = packet_read_line(in, line, sizeof(line));
199 if (!len)
200 break;
201 if (len < 3 ||
202 (memcmp(line, "ok", 2) && memcmp(line, "ng", 2))) {
203 fprintf(stderr, "protocol error: %s\n", line);
204 ret = -1;
205 break;
206 }
207 if (!memcmp(line, "ok", 2))
208 continue;
209 fputs(line, stderr);
210 ret = -1;
211 }
212 return ret;
213}
214static int send_pack(int in, int out, int nr_refspec, char **refspec)
216{
217 struct ref *ref;
218 int new_refs;
219 int ret = 0;
220 int ask_for_status_report = 0;
221 int expect_status_report = 0;
222 /* No funny business with the matcher */
224 remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, 1);
225 get_local_heads();
226 /* Does the other end support the reporting? */
228 if (server_supports("report-status"))
229 ask_for_status_report = 1;
230 /* match them up */
232 if (!remote_tail)
233 remote_tail = &remote_refs;
234 if (match_refs(local_refs, remote_refs, &remote_tail,
235 nr_refspec, refspec, send_all))
236 return -1;
237 if (!remote_refs) {
239 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
240 return 0;
241 }
242 /*
244 * Finally, tell the other end!
245 */
246 new_refs = 0;
247 for (ref = remote_refs; ref; ref = ref->next) {
248 char old_hex[60], *new_hex;
249 if (!ref->peer_ref)
250 continue;
251 if (!memcmp(ref->old_sha1, ref->peer_ref->new_sha1, 20)) {
252 if (verbose)
253 fprintf(stderr, "'%s': up-to-date\n", ref->name);
254 continue;
255 }
256 /* This part determines what can overwrite what.
258 * The rules are:
259 *
260 * (0) you can always use --force or +A:B notation to
261 * selectively force individual ref pairs.
262 *
263 * (1) if the old thing does not exist, it is OK.
264 *
265 * (2) if you do not have the old thing, you are not allowed
266 * to overwrite it; you would not know what you are losing
267 * otherwise.
268 *
269 * (3) if both new and old are commit-ish, and new is a
270 * descendant of old, it is OK.
271 */
272 if (!force_update &&
274 !is_zero_sha1(ref->old_sha1) &&
275 !ref->force) {
276 if (!has_sha1_file(ref->old_sha1) ||
277 !ref_newer(ref->peer_ref->new_sha1,
278 ref->old_sha1)) {
279 /* We do not have the remote ref, or
280 * we know that the remote ref is not
281 * an ancestor of what we are trying to
282 * push. Either way this can be losing
283 * commits at the remote end and likely
284 * we were not up to date to begin with.
285 */
286 error("remote '%s' is not a strict "
287 "subset of local ref '%s'. "
288 "maybe you are not up-to-date and "
289 "need to pull first?",
290 ref->name,
291 ref->peer_ref->name);
292 ret = -2;
293 continue;
294 }
295 }
296 memcpy(ref->new_sha1, ref->peer_ref->new_sha1, 20);
297 if (is_zero_sha1(ref->new_sha1)) {
298 error("cannot happen anymore");
299 ret = -3;
300 continue;
301 }
302 new_refs++;
303 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
304 new_hex = sha1_to_hex(ref->new_sha1);
305 if (ask_for_status_report) {
307 packet_write(out, "%s %s %s%c%s",
308 old_hex, new_hex, ref->name, 0,
309 "report-status");
310 ask_for_status_report = 0;
311 expect_status_report = 1;
312 }
313 else
314 packet_write(out, "%s %s %s",
315 old_hex, new_hex, ref->name);
316 fprintf(stderr, "updating '%s'", ref->name);
317 if (strcmp(ref->name, ref->peer_ref->name))
318 fprintf(stderr, " using '%s'", ref->peer_ref->name);
319 fprintf(stderr, "\n from %s\n to %s\n", old_hex, new_hex);
320 }
321 packet_flush(out);
323 if (new_refs)
324 pack_objects(out, remote_refs);
325 close(out);
326 if (expect_status_report) {
328 if (receive_status(in))
329 ret = -4;
330 }
331 if (!new_refs && ret == 0)
333 fprintf(stderr, "Everything up-to-date\n");
334 return ret;
335}
336int main(int argc, char **argv)
339{
340 int i, nr_heads = 0;
341 char *dest = NULL;
342 char **heads = NULL;
343 int fd[2], ret;
344 pid_t pid;
345 setup_git_directory();
347 argv++;
348 for (i = 1; i < argc; i++, argv++) {
349 char *arg = *argv;
350 if (*arg == '-') {
352 if (!strncmp(arg, "--exec=", 7)) {
353 exec = arg + 7;
354 continue;
355 }
356 if (!strcmp(arg, "--all")) {
357 send_all = 1;
358 continue;
359 }
360 if (!strcmp(arg, "--force")) {
361 force_update = 1;
362 continue;
363 }
364 if (!strcmp(arg, "--verbose")) {
365 verbose = 1;
366 continue;
367 }
368 if (!strcmp(arg, "--thin")) {
369 use_thin_pack = 1;
370 continue;
371 }
372 usage(send_pack_usage);
373 }
374 if (!dest) {
375 dest = arg;
376 continue;
377 }
378 heads = argv;
379 nr_heads = argc - i;
380 break;
381 }
382 if (!dest)
383 usage(send_pack_usage);
384 if (heads && send_all)
385 usage(send_pack_usage);
386 pid = git_connect(fd, dest, exec);
387 if (pid < 0)
388 return 1;
389 ret = send_pack(fd[0], fd[1], nr_heads, heads);
390 close(fd[0]);
391 close(fd[1]);
392 finish_connect(pid);
393 return ret;
394}