Merge branch 'maint'
[git/dkf.git] / receive-pack.c
blobf83ae87e150ff93728da989f1d35ce0ad7c10f60
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)
23 if (strcmp(var, "receive.denynonfastforwards") == 0) {
24 deny_non_fast_forwards = git_config_bool(var, value);
25 return 0;
28 if (strcmp(var, "receive.unpacklimit") == 0) {
29 receive_unpack_limit = git_config_int(var, value);
30 return 0;
33 if (strcmp(var, "transfer.unpacklimit") == 0) {
34 transfer_unpack_limit = git_config_int(var, value);
35 return 0;
38 return git_default_config(var, value);
41 static int show_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
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;
52 static void write_head_info(void)
54 for_each_ref(show_ref, NULL);
55 if (!capabilities_sent)
56 show_ref("capabilities^{}", null_sha1, 0, NULL);
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 */
68 static struct command *commands;
70 static const char pre_receive_hook[] = "hooks/pre-receive";
71 static const char post_receive_hook[] = "hooks/post-receive";
73 static int hook_status(int code, const char *hook_name)
75 switch (code) {
76 case 0:
77 return 0;
78 case -ERR_RUN_COMMAND_FORK:
79 return error("hook fork failed");
80 case -ERR_RUN_COMMAND_EXEC:
81 return error("hook execute failed");
82 case -ERR_RUN_COMMAND_PIPE:
83 return error("hook pipe failed");
84 case -ERR_RUN_COMMAND_WAITPID:
85 return error("waitpid failed");
86 case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
87 return error("waitpid is confused");
88 case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
89 return error("%s died of signal", hook_name);
90 case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
91 return error("%s died strangely", hook_name);
92 default:
93 error("%s exited with error code %d", hook_name, -code);
94 return -code;
98 static int run_hook(const char *hook_name)
100 static char buf[sizeof(commands->old_sha1) * 2 + PATH_MAX + 4];
101 struct command *cmd;
102 struct child_process proc;
103 const char *argv[2];
104 int have_input = 0, code;
106 for (cmd = commands; !have_input && cmd; cmd = cmd->next) {
107 if (!cmd->error_string)
108 have_input = 1;
111 if (!have_input || access(hook_name, X_OK) < 0)
112 return 0;
114 argv[0] = hook_name;
115 argv[1] = NULL;
117 memset(&proc, 0, sizeof(proc));
118 proc.argv = argv;
119 proc.in = -1;
120 proc.stdout_to_stderr = 1;
122 code = start_command(&proc);
123 if (code)
124 return hook_status(code, hook_name);
125 for (cmd = commands; cmd; cmd = cmd->next) {
126 if (!cmd->error_string) {
127 size_t n = snprintf(buf, sizeof(buf), "%s %s %s\n",
128 sha1_to_hex(cmd->old_sha1),
129 sha1_to_hex(cmd->new_sha1),
130 cmd->ref_name);
131 if (write_in_full(proc.in, buf, n) != n)
132 break;
135 close(proc.in);
136 return hook_status(finish_command(&proc), hook_name);
139 static int run_update_hook(struct command *cmd)
141 static const char update_hook[] = "hooks/update";
142 struct child_process proc;
143 const char *argv[5];
145 if (access(update_hook, X_OK) < 0)
146 return 0;
148 argv[0] = update_hook;
149 argv[1] = cmd->ref_name;
150 argv[2] = sha1_to_hex(cmd->old_sha1);
151 argv[3] = sha1_to_hex(cmd->new_sha1);
152 argv[4] = NULL;
154 memset(&proc, 0, sizeof(proc));
155 proc.argv = argv;
156 proc.no_stdin = 1;
157 proc.stdout_to_stderr = 1;
159 return hook_status(run_command(&proc), update_hook);
162 static const char *update(struct command *cmd)
164 const char *name = cmd->ref_name;
165 unsigned char *old_sha1 = cmd->old_sha1;
166 unsigned char *new_sha1 = cmd->new_sha1;
167 struct ref_lock *lock;
169 /* only refs/... are allowed */
170 if (prefixcmp(name, "refs/") || check_ref_format(name + 5)) {
171 error("refusing to create funny ref '%s' remotely", name);
172 return "funny refname";
175 if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
176 error("unpack should have generated %s, "
177 "but I can't find it!", sha1_to_hex(new_sha1));
178 return "bad pack";
180 if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
181 !is_null_sha1(old_sha1) &&
182 !prefixcmp(name, "refs/heads/")) {
183 struct object *old_object, *new_object;
184 struct commit *old_commit, *new_commit;
185 struct commit_list *bases, *ent;
187 old_object = parse_object(old_sha1);
188 new_object = parse_object(new_sha1);
190 if (!old_object || !new_object ||
191 old_object->type != OBJ_COMMIT ||
192 new_object->type != OBJ_COMMIT) {
193 error("bad sha1 objects for %s", name);
194 return "bad ref";
196 old_commit = (struct commit *)old_object;
197 new_commit = (struct commit *)new_object;
198 bases = get_merge_bases(old_commit, new_commit, 1);
199 for (ent = bases; ent; ent = ent->next)
200 if (!hashcmp(old_sha1, ent->item->object.sha1))
201 break;
202 free_commit_list(bases);
203 if (!ent) {
204 error("denying non-fast forward %s"
205 " (you should pull first)", name);
206 return "non-fast forward";
209 if (run_update_hook(cmd)) {
210 error("hook declined to update %s", name);
211 return "hook declined";
214 if (is_null_sha1(new_sha1)) {
215 if (!parse_object(old_sha1)) {
216 warning ("Allowing deletion of corrupt ref.");
217 old_sha1 = NULL;
219 if (delete_ref(name, old_sha1)) {
220 error("failed to delete %s", name);
221 return "failed to delete";
223 return NULL; /* good */
225 else {
226 lock = lock_any_ref_for_update(name, old_sha1, 0);
227 if (!lock) {
228 error("failed to lock %s", name);
229 return "failed to lock";
231 if (write_ref_sha1(lock, new_sha1, "push")) {
232 return "failed to write"; /* error() already called */
234 return NULL; /* good */
238 static char update_post_hook[] = "hooks/post-update";
240 static void run_update_post_hook(struct command *cmd)
242 struct command *cmd_p;
243 int argc;
244 const char **argv;
246 for (argc = 0, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
247 if (cmd_p->error_string)
248 continue;
249 argc++;
251 if (!argc || access(update_post_hook, X_OK) < 0)
252 return;
253 argv = xmalloc(sizeof(*argv) * (2 + argc));
254 argv[0] = update_post_hook;
256 for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
257 char *p;
258 if (cmd_p->error_string)
259 continue;
260 p = xmalloc(strlen(cmd_p->ref_name) + 1);
261 strcpy(p, cmd_p->ref_name);
262 argv[argc] = p;
263 argc++;
265 argv[argc] = NULL;
266 run_command_v_opt(argv, RUN_COMMAND_NO_STDIN
267 | RUN_COMMAND_STDOUT_TO_STDERR);
270 static void execute_commands(const char *unpacker_error)
272 struct command *cmd = commands;
274 if (unpacker_error) {
275 while (cmd) {
276 cmd->error_string = "n/a (unpacker error)";
277 cmd = cmd->next;
279 return;
282 if (run_hook(pre_receive_hook)) {
283 while (cmd) {
284 cmd->error_string = "pre-receive hook declined";
285 cmd = cmd->next;
287 return;
290 while (cmd) {
291 cmd->error_string = update(cmd);
292 cmd = cmd->next;
296 static void read_head_info(void)
298 struct command **p = &commands;
299 for (;;) {
300 static char line[1000];
301 unsigned char old_sha1[20], new_sha1[20];
302 struct command *cmd;
303 char *refname;
304 int len, reflen;
306 len = packet_read_line(0, line, sizeof(line));
307 if (!len)
308 break;
309 if (line[len-1] == '\n')
310 line[--len] = 0;
311 if (len < 83 ||
312 line[40] != ' ' ||
313 line[81] != ' ' ||
314 get_sha1_hex(line, old_sha1) ||
315 get_sha1_hex(line + 41, new_sha1))
316 die("protocol error: expected old/new/ref, got '%s'",
317 line);
319 refname = line + 82;
320 reflen = strlen(refname);
321 if (reflen + 82 < len) {
322 if (strstr(refname + reflen + 1, "report-status"))
323 report_status = 1;
325 cmd = xmalloc(sizeof(struct command) + len - 80);
326 hashcpy(cmd->old_sha1, old_sha1);
327 hashcpy(cmd->new_sha1, new_sha1);
328 memcpy(cmd->ref_name, line + 82, len - 81);
329 cmd->error_string = NULL;
330 cmd->next = NULL;
331 *p = cmd;
332 p = &cmd->next;
336 static const char *parse_pack_header(struct pack_header *hdr)
338 switch (read_pack_header(0, hdr)) {
339 case PH_ERROR_EOF:
340 return "eof before pack header was fully read";
342 case PH_ERROR_PACK_SIGNATURE:
343 return "protocol error (pack signature mismatch detected)";
345 case PH_ERROR_PROTOCOL:
346 return "protocol error (pack version unsupported)";
348 default:
349 return "unknown error in parse_pack_header";
351 case 0:
352 return NULL;
356 static const char *pack_lockfile;
358 static const char *unpack(void)
360 struct pack_header hdr;
361 const char *hdr_err;
362 char hdr_arg[38];
364 hdr_err = parse_pack_header(&hdr);
365 if (hdr_err)
366 return hdr_err;
367 snprintf(hdr_arg, sizeof(hdr_arg), "--pack_header=%u,%u",
368 ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
370 if (ntohl(hdr.hdr_entries) < unpack_limit) {
371 int code;
372 const char *unpacker[3];
373 unpacker[0] = "unpack-objects";
374 unpacker[1] = hdr_arg;
375 unpacker[2] = NULL;
376 code = run_command_v_opt(unpacker, RUN_GIT_CMD);
377 switch (code) {
378 case 0:
379 return NULL;
380 case -ERR_RUN_COMMAND_FORK:
381 return "unpack fork failed";
382 case -ERR_RUN_COMMAND_EXEC:
383 return "unpack execute failed";
384 case -ERR_RUN_COMMAND_WAITPID:
385 return "waitpid failed";
386 case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
387 return "waitpid is confused";
388 case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
389 return "unpacker died of signal";
390 case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
391 return "unpacker died strangely";
392 default:
393 return "unpacker exited with error code";
395 } else {
396 const char *keeper[6];
397 int s, status;
398 char keep_arg[256];
399 struct child_process ip;
401 s = sprintf(keep_arg, "--keep=receive-pack %i on ", getpid());
402 if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
403 strcpy(keep_arg + s, "localhost");
405 keeper[0] = "index-pack";
406 keeper[1] = "--stdin";
407 keeper[2] = "--fix-thin";
408 keeper[3] = hdr_arg;
409 keeper[4] = keep_arg;
410 keeper[5] = NULL;
411 memset(&ip, 0, sizeof(ip));
412 ip.argv = keeper;
413 ip.out = -1;
414 ip.git_cmd = 1;
415 if (start_command(&ip))
416 return "index-pack fork failed";
417 pack_lockfile = index_pack_lockfile(ip.out);
418 close(ip.out);
419 status = finish_command(&ip);
420 if (!status) {
421 reprepare_packed_git();
422 return NULL;
424 return "index-pack abnormal exit";
428 static void report(const char *unpack_status)
430 struct command *cmd;
431 packet_write(1, "unpack %s\n",
432 unpack_status ? unpack_status : "ok");
433 for (cmd = commands; cmd; cmd = cmd->next) {
434 if (!cmd->error_string)
435 packet_write(1, "ok %s\n",
436 cmd->ref_name);
437 else
438 packet_write(1, "ng %s %s\n",
439 cmd->ref_name, cmd->error_string);
441 packet_flush(1);
444 static int delete_only(struct command *cmd)
446 while (cmd) {
447 if (!is_null_sha1(cmd->new_sha1))
448 return 0;
449 cmd = cmd->next;
451 return 1;
454 int main(int argc, char **argv)
456 int i;
457 char *dir = NULL;
459 argv++;
460 for (i = 1; i < argc; i++) {
461 char *arg = *argv++;
463 if (*arg == '-') {
464 /* Do flag handling here */
465 usage(receive_pack_usage);
467 if (dir)
468 usage(receive_pack_usage);
469 dir = arg;
471 if (!dir)
472 usage(receive_pack_usage);
474 setup_path(NULL);
476 if (!enter_repo(dir, 0))
477 die("'%s': unable to chdir or not a git archive", dir);
479 if (is_repository_shallow())
480 die("attempt to push into a shallow repository");
482 git_config(receive_pack_config);
484 if (0 <= transfer_unpack_limit)
485 unpack_limit = transfer_unpack_limit;
486 else if (0 <= receive_unpack_limit)
487 unpack_limit = receive_unpack_limit;
489 write_head_info();
491 /* EOF */
492 packet_flush(1);
494 read_head_info();
495 if (commands) {
496 const char *unpack_status = NULL;
498 if (!delete_only(commands))
499 unpack_status = unpack();
500 execute_commands(unpack_status);
501 if (pack_lockfile)
502 unlink(pack_lockfile);
503 if (report_status)
504 report(unpack_status);
505 run_hook(post_receive_hook);
506 run_update_post_hook(commands);
508 return 0;