e147076056673befd3e2828b95127fdb37c4cf7b
1 #include "cache.h"
2 #include "pack.h"
3 #include "refs.h"
4 #include "pkt-line.h"
5 #include "run-command.h"
6 #include "exec_cmd.h"
7 #include "commit.h"
8 #include "object.h"
10 static const char receive_pack_usage[] = "git-receive-pack <git-dir>";
12 static int deny_non_fast_forwards = 0;
13 static int receive_unpack_limit = -1;
14 static int transfer_unpack_limit = -1;
15 static int unpack_limit = 100;
16 static int report_status;
18 static char capabilities[] = " report-status delete-refs ";
19 static int capabilities_sent;
21 static int receive_pack_config(const char *var, const char *value)
22 {
23 if (strcmp(var, "receive.denynonfastforwards") == 0) {
24 deny_non_fast_forwards = git_config_bool(var, value);
25 return 0;
26 }
28 if (strcmp(var, "receive.unpacklimit") == 0) {
29 receive_unpack_limit = git_config_int(var, value);
30 return 0;
31 }
33 if (strcmp(var, "transfer.unpacklimit") == 0) {
34 transfer_unpack_limit = git_config_int(var, value);
35 return 0;
36 }
38 return git_default_config(var, value);
39 }
41 static int show_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
42 {
43 if (capabilities_sent)
44 packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
45 else
46 packet_write(1, "%s %s%c%s\n",
47 sha1_to_hex(sha1), path, 0, capabilities);
48 capabilities_sent = 1;
49 return 0;
50 }
52 static void write_head_info(void)
53 {
54 for_each_ref(show_ref, NULL);
55 if (!capabilities_sent)
56 show_ref("capabilities^{}", null_sha1, 0, NULL);
58 }
60 struct command {
61 struct command *next;
62 const char *error_string;
63 unsigned char old_sha1[20];
64 unsigned char new_sha1[20];
65 char ref_name[FLEX_ARRAY]; /* more */
66 };
68 static struct command *commands;
70 static const char update_hook[] = "hooks/update";
71 static const char pre_receive_hook[] = "hooks/pre-receive";
72 static const char post_receive_hook[] = "hooks/post-receive";
74 static int hook_status(int code, const char *hook_name)
75 {
76 switch (code) {
77 case 0:
78 return 0;
79 case -ERR_RUN_COMMAND_FORK:
80 return error("hook fork failed");
81 case -ERR_RUN_COMMAND_EXEC:
82 return error("hook execute failed");
83 case -ERR_RUN_COMMAND_WAITPID:
84 return error("waitpid failed");
85 case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
86 return error("waitpid is confused");
87 case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
88 return error("%s died of signal", hook_name);
89 case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
90 return error("%s died strangely", hook_name);
91 default:
92 error("%s exited with error code %d", hook_name, -code);
93 return -code;
94 }
95 }
97 static int run_hook(const char *hook_name,
98 struct command *first_cmd,
99 int single)
100 {
101 struct command *cmd;
102 int argc, code;
103 const char **argv;
105 for (argc = 0, cmd = first_cmd; cmd; cmd = cmd->next) {
106 if (!cmd->error_string)
107 argc += 3;
108 if (single)
109 break;
110 }
112 if (!argc || access(hook_name, X_OK) < 0)
113 return 0;
115 argv = xmalloc(sizeof(*argv) * (2 + argc));
116 argv[0] = hook_name;
117 for (argc = 1, cmd = first_cmd; cmd; cmd = cmd->next) {
118 if (!cmd->error_string) {
119 argv[argc++] = xstrdup(cmd->ref_name);
120 argv[argc++] = xstrdup(sha1_to_hex(cmd->old_sha1));
121 argv[argc++] = xstrdup(sha1_to_hex(cmd->new_sha1));
122 }
123 if (single)
124 break;
125 }
126 argv[argc] = NULL;
128 code = run_command_v_opt(argv,
129 RUN_COMMAND_NO_STDIN | RUN_COMMAND_STDOUT_TO_STDERR);
130 while (--argc > 0)
131 free((char*)argv[argc]);
132 free(argv);
134 return hook_status(code, hook_name);
135 }
137 static const char *update(struct command *cmd)
138 {
139 const char *name = cmd->ref_name;
140 unsigned char *old_sha1 = cmd->old_sha1;
141 unsigned char *new_sha1 = cmd->new_sha1;
142 struct ref_lock *lock;
144 if (!prefixcmp(name, "refs/") && check_ref_format(name + 5)) {
145 error("refusing to create funny ref '%s' locally", name);
146 return "funny refname";
147 }
149 if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
150 error("unpack should have generated %s, "
151 "but I can't find it!", sha1_to_hex(new_sha1));
152 return "bad pack";
153 }
154 if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
155 !is_null_sha1(old_sha1) &&
156 !prefixcmp(name, "refs/heads/")) {
157 struct commit *old_commit, *new_commit;
158 struct commit_list *bases, *ent;
160 old_commit = (struct commit *)parse_object(old_sha1);
161 new_commit = (struct commit *)parse_object(new_sha1);
162 bases = get_merge_bases(old_commit, new_commit, 1);
163 for (ent = bases; ent; ent = ent->next)
164 if (!hashcmp(old_sha1, ent->item->object.sha1))
165 break;
166 free_commit_list(bases);
167 if (!ent) {
168 error("denying non-fast forward %s"
169 " (you should pull first)", name);
170 return "non-fast forward";
171 }
172 }
173 if (run_hook(update_hook, cmd, 1)) {
174 error("hook declined to update %s", name);
175 return "hook declined";
176 }
178 if (is_null_sha1(new_sha1)) {
179 if (delete_ref(name, old_sha1)) {
180 error("failed to delete %s", name);
181 return "failed to delete";
182 }
183 fprintf(stderr, "%s: %s -> deleted\n", name,
184 sha1_to_hex(old_sha1));
185 return NULL; /* good */
186 }
187 else {
188 lock = lock_any_ref_for_update(name, old_sha1);
189 if (!lock) {
190 error("failed to lock %s", name);
191 return "failed to lock";
192 }
193 if (write_ref_sha1(lock, new_sha1, "push")) {
194 return "failed to write"; /* error() already called */
195 }
196 fprintf(stderr, "%s: %s -> %s\n", name,
197 sha1_to_hex(old_sha1), sha1_to_hex(new_sha1));
198 return NULL; /* good */
199 }
200 }
202 static char update_post_hook[] = "hooks/post-update";
204 static void run_update_post_hook(struct command *cmd)
205 {
206 struct command *cmd_p;
207 int argc;
208 const char **argv;
210 for (argc = 0, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
211 if (cmd_p->error_string)
212 continue;
213 argc++;
214 }
215 if (!argc || access(update_post_hook, X_OK) < 0)
216 return;
217 argv = xmalloc(sizeof(*argv) * (2 + argc));
218 argv[0] = update_post_hook;
220 for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
221 char *p;
222 if (cmd_p->error_string)
223 continue;
224 p = xmalloc(strlen(cmd_p->ref_name) + 1);
225 strcpy(p, cmd_p->ref_name);
226 argv[argc] = p;
227 argc++;
228 }
229 argv[argc] = NULL;
230 run_command_v_opt(argv, RUN_COMMAND_NO_STDIN
231 | RUN_COMMAND_STDOUT_TO_STDERR);
232 }
234 static void execute_commands(const char *unpacker_error)
235 {
236 struct command *cmd = commands;
238 if (unpacker_error) {
239 while (cmd) {
240 cmd->error_string = "n/a (unpacker error)";
241 cmd = cmd->next;
242 }
243 return;
244 }
246 if (run_hook(pre_receive_hook, commands, 0)) {
247 while (cmd) {
248 cmd->error_string = "pre-receive hook declined";
249 cmd = cmd->next;
250 }
251 return;
252 }
254 while (cmd) {
255 cmd->error_string = update(cmd);
256 cmd = cmd->next;
257 }
258 }
260 static void read_head_info(void)
261 {
262 struct command **p = &commands;
263 for (;;) {
264 static char line[1000];
265 unsigned char old_sha1[20], new_sha1[20];
266 struct command *cmd;
267 char *refname;
268 int len, reflen;
270 len = packet_read_line(0, line, sizeof(line));
271 if (!len)
272 break;
273 if (line[len-1] == '\n')
274 line[--len] = 0;
275 if (len < 83 ||
276 line[40] != ' ' ||
277 line[81] != ' ' ||
278 get_sha1_hex(line, old_sha1) ||
279 get_sha1_hex(line + 41, new_sha1))
280 die("protocol error: expected old/new/ref, got '%s'",
281 line);
283 refname = line + 82;
284 reflen = strlen(refname);
285 if (reflen + 82 < len) {
286 if (strstr(refname + reflen + 1, "report-status"))
287 report_status = 1;
288 }
289 cmd = xmalloc(sizeof(struct command) + len - 80);
290 hashcpy(cmd->old_sha1, old_sha1);
291 hashcpy(cmd->new_sha1, new_sha1);
292 memcpy(cmd->ref_name, line + 82, len - 81);
293 cmd->error_string = NULL;
294 cmd->next = NULL;
295 *p = cmd;
296 p = &cmd->next;
297 }
298 }
300 static const char *parse_pack_header(struct pack_header *hdr)
301 {
302 switch (read_pack_header(0, hdr)) {
303 case PH_ERROR_EOF:
304 return "eof before pack header was fully read";
306 case PH_ERROR_PACK_SIGNATURE:
307 return "protocol error (pack signature mismatch detected)";
309 case PH_ERROR_PROTOCOL:
310 return "protocol error (pack version unsupported)";
312 default:
313 return "unknown error in parse_pack_header";
315 case 0:
316 return NULL;
317 }
318 }
320 static const char *pack_lockfile;
322 static const char *unpack(void)
323 {
324 struct pack_header hdr;
325 const char *hdr_err;
326 char hdr_arg[38];
328 hdr_err = parse_pack_header(&hdr);
329 if (hdr_err)
330 return hdr_err;
331 snprintf(hdr_arg, sizeof(hdr_arg), "--pack_header=%u,%u",
332 ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
334 if (ntohl(hdr.hdr_entries) < unpack_limit) {
335 int code;
336 const char *unpacker[3];
337 unpacker[0] = "unpack-objects";
338 unpacker[1] = hdr_arg;
339 unpacker[2] = NULL;
340 code = run_command_v_opt(unpacker, RUN_GIT_CMD);
341 switch (code) {
342 case 0:
343 return NULL;
344 case -ERR_RUN_COMMAND_FORK:
345 return "unpack fork failed";
346 case -ERR_RUN_COMMAND_EXEC:
347 return "unpack execute failed";
348 case -ERR_RUN_COMMAND_WAITPID:
349 return "waitpid failed";
350 case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
351 return "waitpid is confused";
352 case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
353 return "unpacker died of signal";
354 case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
355 return "unpacker died strangely";
356 default:
357 return "unpacker exited with error code";
358 }
359 } else {
360 const char *keeper[6];
361 int fd[2], s, len, status;
362 pid_t pid;
363 char keep_arg[256];
364 char packname[46];
366 s = sprintf(keep_arg, "--keep=receive-pack %i on ", getpid());
367 if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
368 strcpy(keep_arg + s, "localhost");
370 keeper[0] = "index-pack";
371 keeper[1] = "--stdin";
372 keeper[2] = "--fix-thin";
373 keeper[3] = hdr_arg;
374 keeper[4] = keep_arg;
375 keeper[5] = NULL;
377 if (pipe(fd) < 0)
378 return "index-pack pipe failed";
379 pid = fork();
380 if (pid < 0)
381 return "index-pack fork failed";
382 if (!pid) {
383 dup2(fd[1], 1);
384 close(fd[1]);
385 close(fd[0]);
386 execv_git_cmd(keeper);
387 die("execv of index-pack failed");
388 }
389 close(fd[1]);
391 /*
392 * The first thing we expects from index-pack's output
393 * is "pack\t%40s\n" or "keep\t%40s\n" (46 bytes) where
394 * %40s is the newly created pack SHA1 name. In the "keep"
395 * case, we need it to remove the corresponding .keep file
396 * later on. If we don't get that then tough luck with it.
397 */
398 for (len = 0;
399 len < 46 && (s = xread(fd[0], packname+len, 46-len)) > 0;
400 len += s);
401 close(fd[0]);
402 if (len == 46 && packname[45] == '\n' &&
403 memcmp(packname, "keep\t", 5) == 0) {
404 char path[PATH_MAX];
405 packname[45] = 0;
406 snprintf(path, sizeof(path), "%s/pack/pack-%s.keep",
407 get_object_directory(), packname + 5);
408 pack_lockfile = xstrdup(path);
409 }
411 /* Then wrap our index-pack process. */
412 while (waitpid(pid, &status, 0) < 0)
413 if (errno != EINTR)
414 return "waitpid failed";
415 if (WIFEXITED(status)) {
416 int code = WEXITSTATUS(status);
417 if (code)
418 return "index-pack exited with error code";
419 reprepare_packed_git();
420 return NULL;
421 }
422 return "index-pack abnormal exit";
423 }
424 }
426 static void report(const char *unpack_status)
427 {
428 struct command *cmd;
429 packet_write(1, "unpack %s\n",
430 unpack_status ? unpack_status : "ok");
431 for (cmd = commands; cmd; cmd = cmd->next) {
432 if (!cmd->error_string)
433 packet_write(1, "ok %s\n",
434 cmd->ref_name);
435 else
436 packet_write(1, "ng %s %s\n",
437 cmd->ref_name, cmd->error_string);
438 }
439 packet_flush(1);
440 }
442 static int delete_only(struct command *cmd)
443 {
444 while (cmd) {
445 if (!is_null_sha1(cmd->new_sha1))
446 return 0;
447 cmd = cmd->next;
448 }
449 return 1;
450 }
452 int main(int argc, char **argv)
453 {
454 int i;
455 char *dir = NULL;
457 argv++;
458 for (i = 1; i < argc; i++) {
459 char *arg = *argv++;
461 if (*arg == '-') {
462 /* Do flag handling here */
463 usage(receive_pack_usage);
464 }
465 if (dir)
466 usage(receive_pack_usage);
467 dir = arg;
468 }
469 if (!dir)
470 usage(receive_pack_usage);
472 if (!enter_repo(dir, 0))
473 die("'%s': unable to chdir or not a git archive", dir);
475 if (is_repository_shallow())
476 die("attempt to push into a shallow repository");
478 git_config(receive_pack_config);
480 if (0 <= transfer_unpack_limit)
481 unpack_limit = transfer_unpack_limit;
482 else if (0 <= receive_unpack_limit)
483 unpack_limit = receive_unpack_limit;
485 write_head_info();
487 /* EOF */
488 packet_flush(1);
490 read_head_info();
491 if (commands) {
492 const char *unpack_status = NULL;
494 if (!delete_only(commands))
495 unpack_status = unpack();
496 execute_commands(unpack_status);
497 if (pack_lockfile)
498 unlink(pack_lockfile);
499 if (report_status)
500 report(unpack_status);
501 run_hook(post_receive_hook, commands, 0);
502 run_update_post_hook(commands);
503 }
504 return 0;
505 }