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 is_zero_sha1(const unsigned char *sha1)
17{
18 int i;
19 for (i = 0; i < 20; i++) {
21 if (*sha1++)
22 return 0;
23 }
24 return 1;
25}
26static void exec_pack_objects(void)
28{
29 static char *args[] = {
30 "pack-objects",
31 "--stdout",
32 NULL
33 };
34 execv_git_cmd(args);
35 die("git-pack-objects exec failed (%s)", strerror(errno));
36}
37static void exec_rev_list(struct ref *refs)
39{
40 struct ref *ref;
41 static char *args[1000];
42 int i = 0, j;
43 args[i++] = "rev-list"; /* 0 */
45 args[i++] = "--objects"; /* 1 */
46 /* First send the ones we care about most */
48 for (ref = refs; ref; ref = ref->next) {
49 if (900 < i)
50 die("git-rev-list environment overflow");
51 if (!is_zero_sha1(ref->new_sha1)) {
52 char *buf = malloc(100);
53 args[i++] = buf;
54 snprintf(buf, 50, "%s", sha1_to_hex(ref->new_sha1));
55 buf += 50;
56 if (!is_zero_sha1(ref->old_sha1) &&
57 has_sha1_file(ref->old_sha1)) {
58 args[i++] = buf;
59 snprintf(buf, 50, "^%s",
60 sha1_to_hex(ref->old_sha1));
61 }
62 }
63 }
64 /* Then a handful of the remainder
66 * NEEDSWORK: we would be better off if used the newer ones first.
67 */
68 for (ref = refs, j = i + 16;
69 i < 900 && i < j && ref;
70 ref = ref->next) {
71 if (is_zero_sha1(ref->new_sha1) &&
72 !is_zero_sha1(ref->old_sha1) &&
73 has_sha1_file(ref->old_sha1)) {
74 char *buf = malloc(42);
75 args[i++] = buf;
76 snprintf(buf, 42, "^%s", sha1_to_hex(ref->old_sha1));
77 }
78 }
79 args[i] = NULL;
80 execv_git_cmd(args);
81 die("git-rev-list exec failed (%s)", strerror(errno));
82}
83static void rev_list(int fd, struct ref *refs)
85{
86 int pipe_fd[2];
87 pid_t pack_objects_pid;
88 if (pipe(pipe_fd) < 0)
90 die("rev-list setup: pipe failed");
91 pack_objects_pid = fork();
92 if (!pack_objects_pid) {
93 dup2(pipe_fd[0], 0);
94 dup2(fd, 1);
95 close(pipe_fd[0]);
96 close(pipe_fd[1]);
97 close(fd);
98 exec_pack_objects();
99 die("pack-objects setup failed");
100 }
101 if (pack_objects_pid < 0)
102 die("pack-objects fork failed");
103 dup2(pipe_fd[1], 1);
104 close(pipe_fd[0]);
105 close(pipe_fd[1]);
106 close(fd);
107 exec_rev_list(refs);
108}
109static int pack_objects(int fd, struct ref *refs)
111{
112 pid_t rev_list_pid;
113 rev_list_pid = fork();
115 if (!rev_list_pid) {
116 rev_list(fd, refs);
117 die("rev-list setup failed");
118 }
119 if (rev_list_pid < 0)
120 die("rev-list fork failed");
121 /*
122 * We don't wait for the rev-list pipeline in the parent:
123 * we end up waiting for the other end instead
124 */
125 return 0;
126}
127static void unmark_and_free(struct commit_list *list, unsigned int mark)
129{
130 while (list) {
131 struct commit_list *temp = list;
132 temp->item->object.flags &= ~mark;
133 list = temp->next;
134 free(temp);
135 }
136}
137static int ref_newer(const unsigned char *new_sha1,
139 const unsigned char *old_sha1)
140{
141 struct object *o;
142 struct commit *old, *new;
143 struct commit_list *list, *used;
144 int found = 0;
145 /* Both new and old must be commit-ish and new is descendant of
147 * old. Otherwise we require --force.
148 */
149 o = deref_tag(parse_object(old_sha1), NULL, 0);
150 if (!o || o->type != commit_type)
151 return 0;
152 old = (struct commit *) o;
153 o = deref_tag(parse_object(new_sha1), NULL, 0);
155 if (!o || o->type != commit_type)
156 return 0;
157 new = (struct commit *) o;
158 if (parse_commit(new) < 0)
160 return 0;
161 used = list = NULL;
163 commit_list_insert(new, &list);
164 while (list) {
165 new = pop_most_recent_commit(&list, 1);
166 commit_list_insert(new, &used);
167 if (new == old) {
168 found = 1;
169 break;
170 }
171 }
172 unmark_and_free(list, 1);
173 unmark_and_free(used, 1);
174 return found;
175}
176static struct ref *local_refs, **local_tail;
178static struct ref *remote_refs, **remote_tail;
179static int one_local_ref(const char *refname, const unsigned char *sha1)
181{
182 struct ref *ref;
183 int len = strlen(refname) + 1;
184 ref = xcalloc(1, sizeof(*ref) + len);
185 memcpy(ref->new_sha1, sha1, 20);
186 memcpy(ref->name, refname, len);
187 *local_tail = ref;
188 local_tail = &ref->next;
189 return 0;
190}
191static void get_local_heads(void)
193{
194 local_tail = &local_refs;
195 for_each_ref(one_local_ref);
196}
197static int receive_status(int in)
199{
200 char line[1000];
201 int ret = 0;
202 int len = packet_read_line(in, line, sizeof(line));
203 if (len < 10 || memcmp(line, "unpack ", 7)) {
204 fprintf(stderr, "did not receive status back\n");
205 return -1;
206 }
207 if (memcmp(line, "unpack ok\n", 10)) {
208 fputs(line, stderr);
209 ret = -1;
210 }
211 while (1) {
212 len = packet_read_line(in, line, sizeof(line));
213 if (!len)
214 break;
215 if (len < 3 ||
216 (memcmp(line, "ok", 2) && memcmp(line, "ng", 2))) {
217 fprintf(stderr, "protocol error: %s\n", line);
218 ret = -1;
219 break;
220 }
221 if (!memcmp(line, "ok", 2))
222 continue;
223 fputs(line, stderr);
224 ret = -1;
225 }
226 return ret;
227}
228static int send_pack(int in, int out, int nr_refspec, char **refspec)
230{
231 struct ref *ref;
232 int new_refs;
233 int ret = 0;
234 int ask_for_status_report = 0;
235 int expect_status_report = 0;
236 /* No funny business with the matcher */
238 remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, 1);
239 get_local_heads();
240 /* Does the other end support the reporting? */
242 if (server_supports("report-status"))
243 ask_for_status_report = 1;
244 /* match them up */
246 if (!remote_tail)
247 remote_tail = &remote_refs;
248 if (match_refs(local_refs, remote_refs, &remote_tail,
249 nr_refspec, refspec, send_all))
250 return -1;
251 if (!remote_refs) {
253 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
254 return 0;
255 }
256 /*
258 * Finally, tell the other end!
259 */
260 new_refs = 0;
261 for (ref = remote_refs; ref; ref = ref->next) {
262 char old_hex[60], *new_hex;
263 if (!ref->peer_ref)
264 continue;
265 if (!memcmp(ref->old_sha1, ref->peer_ref->new_sha1, 20)) {
266 if (verbose)
267 fprintf(stderr, "'%s': up-to-date\n", ref->name);
268 continue;
269 }
270 /* This part determines what can overwrite what.
272 * The rules are:
273 *
274 * (0) you can always use --force or +A:B notation to
275 * selectively force individual ref pairs.
276 *
277 * (1) if the old thing does not exist, it is OK.
278 *
279 * (2) if you do not have the old thing, you are not allowed
280 * to overwrite it; you would not know what you are losing
281 * otherwise.
282 *
283 * (3) if both new and old are commit-ish, and new is a
284 * descendant of old, it is OK.
285 */
286 if (!force_update &&
288 !is_zero_sha1(ref->old_sha1) &&
289 !ref->force) {
290 if (!has_sha1_file(ref->old_sha1) ||
291 !ref_newer(ref->peer_ref->new_sha1,
292 ref->old_sha1)) {
293 /* We do not have the remote ref, or
294 * we know that the remote ref is not
295 * an ancestor of what we are trying to
296 * push. Either way this can be losing
297 * commits at the remote end and likely
298 * we were not up to date to begin with.
299 */
300 error("remote '%s' is not a strict "
301 "subset of local ref '%s'. "
302 "maybe you are not up-to-date and "
303 "need to pull first?",
304 ref->name,
305 ref->peer_ref->name);
306 ret = -2;
307 continue;
308 }
309 }
310 memcpy(ref->new_sha1, ref->peer_ref->new_sha1, 20);
311 if (is_zero_sha1(ref->new_sha1)) {
312 error("cannot happen anymore");
313 ret = -3;
314 continue;
315 }
316 new_refs++;
317 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
318 new_hex = sha1_to_hex(ref->new_sha1);
319 if (ask_for_status_report) {
321 packet_write(out, "%s %s %s%c%s",
322 old_hex, new_hex, ref->name, 0,
323 "report-status");
324 ask_for_status_report = 0;
325 expect_status_report = 1;
326 }
327 else
328 packet_write(out, "%s %s %s",
329 old_hex, new_hex, ref->name);
330 fprintf(stderr, "updating '%s'", ref->name);
331 if (strcmp(ref->name, ref->peer_ref->name))
332 fprintf(stderr, " using '%s'", ref->peer_ref->name);
333 fprintf(stderr, "\n from %s\n to %s\n", old_hex, new_hex);
334 }
335 packet_flush(out);
337 if (new_refs)
338 pack_objects(out, remote_refs);
339 close(out);
340 if (expect_status_report) {
342 if (receive_status(in))
343 ret = -4;
344 }
345 if (!new_refs && ret == 0)
347 fprintf(stderr, "Everything up-to-date\n");
348 return ret;
349}
350int main(int argc, char **argv)
353{
354 int i, nr_heads = 0;
355 char *dest = NULL;
356 char **heads = NULL;
357 int fd[2], ret;
358 pid_t pid;
359 setup_git_directory();
361 argv++;
362 for (i = 1; i < argc; i++, argv++) {
363 char *arg = *argv;
364 if (*arg == '-') {
366 if (!strncmp(arg, "--exec=", 7)) {
367 exec = arg + 7;
368 continue;
369 }
370 if (!strcmp(arg, "--all")) {
371 send_all = 1;
372 continue;
373 }
374 if (!strcmp(arg, "--force")) {
375 force_update = 1;
376 continue;
377 }
378 if (!strcmp(arg, "--verbose")) {
379 verbose = 1;
380 continue;
381 }
382 usage(send_pack_usage);
383 }
384 if (!dest) {
385 dest = arg;
386 continue;
387 }
388 heads = argv;
389 nr_heads = argc - i;
390 break;
391 }
392 if (!dest)
393 usage(send_pack_usage);
394 if (heads && send_all)
395 usage(send_pack_usage);
396 pid = git_connect(fd, dest, exec);
397 if (pid < 0)
398 return 1;
399 ret = send_pack(fd[0], fd[1], nr_heads, heads);
400 close(fd[0]);
401 close(fd[1]);
402 finish_connect(pid);
403 return ret;
404}