Provide git_config with a callback-data parameter
[git/git.git] / receive-pack.c
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"
9
10 static const char receive_pack_usage[] = "git-receive-pack <git-dir>";
11
12 static int deny_non_fast_forwards = 0;
13 static int receive_fsck_objects;
14 static int receive_unpack_limit = -1;
15 static int transfer_unpack_limit = -1;
16 static int unpack_limit = 100;
17 static int report_status;
18
19 static char capabilities[] = " report-status delete-refs ";
20 static int capabilities_sent;
21
22 static int receive_pack_config(const char *var, const char *value, void *cb)
23 {
24 if (strcmp(var, "receive.denynonfastforwards") == 0) {
25 deny_non_fast_forwards = git_config_bool(var, value);
26 return 0;
27 }
28
29 if (strcmp(var, "receive.unpacklimit") == 0) {
30 receive_unpack_limit = git_config_int(var, value);
31 return 0;
32 }
33
34 if (strcmp(var, "transfer.unpacklimit") == 0) {
35 transfer_unpack_limit = git_config_int(var, value);
36 return 0;
37 }
38
39 if (strcmp(var, "receive.fsckobjects") == 0) {
40 receive_fsck_objects = git_config_bool(var, value);
41 return 0;
42 }
43
44 return git_default_config(var, value, cb);
45 }
46
47 static int show_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
48 {
49 if (capabilities_sent)
50 packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
51 else
52 packet_write(1, "%s %s%c%s\n",
53 sha1_to_hex(sha1), path, 0, capabilities);
54 capabilities_sent = 1;
55 return 0;
56 }
57
58 static void write_head_info(void)
59 {
60 for_each_ref(show_ref, NULL);
61 if (!capabilities_sent)
62 show_ref("capabilities^{}", null_sha1, 0, NULL);
63
64 }
65
66 struct command {
67 struct command *next;
68 const char *error_string;
69 unsigned char old_sha1[20];
70 unsigned char new_sha1[20];
71 char ref_name[FLEX_ARRAY]; /* more */
72 };
73
74 static struct command *commands;
75
76 static const char pre_receive_hook[] = "hooks/pre-receive";
77 static const char post_receive_hook[] = "hooks/post-receive";
78
79 static int hook_status(int code, const char *hook_name)
80 {
81 switch (code) {
82 case 0:
83 return 0;
84 case -ERR_RUN_COMMAND_FORK:
85 return error("hook fork failed");
86 case -ERR_RUN_COMMAND_EXEC:
87 return error("hook execute failed");
88 case -ERR_RUN_COMMAND_PIPE:
89 return error("hook pipe failed");
90 case -ERR_RUN_COMMAND_WAITPID:
91 return error("waitpid failed");
92 case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
93 return error("waitpid is confused");
94 case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
95 return error("%s died of signal", hook_name);
96 case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
97 return error("%s died strangely", hook_name);
98 default:
99 error("%s exited with error code %d", hook_name, -code);
100 return -code;
101 }
102 }
103
104 static int run_hook(const char *hook_name)
105 {
106 static char buf[sizeof(commands->old_sha1) * 2 + PATH_MAX + 4];
107 struct command *cmd;
108 struct child_process proc;
109 const char *argv[2];
110 int have_input = 0, code;
111
112 for (cmd = commands; !have_input && cmd; cmd = cmd->next) {
113 if (!cmd->error_string)
114 have_input = 1;
115 }
116
117 if (!have_input || access(hook_name, X_OK) < 0)
118 return 0;
119
120 argv[0] = hook_name;
121 argv[1] = NULL;
122
123 memset(&proc, 0, sizeof(proc));
124 proc.argv = argv;
125 proc.in = -1;
126 proc.stdout_to_stderr = 1;
127
128 code = start_command(&proc);
129 if (code)
130 return hook_status(code, hook_name);
131 for (cmd = commands; cmd; cmd = cmd->next) {
132 if (!cmd->error_string) {
133 size_t n = snprintf(buf, sizeof(buf), "%s %s %s\n",
134 sha1_to_hex(cmd->old_sha1),
135 sha1_to_hex(cmd->new_sha1),
136 cmd->ref_name);
137 if (write_in_full(proc.in, buf, n) != n)
138 break;
139 }
140 }
141 close(proc.in);
142 return hook_status(finish_command(&proc), hook_name);
143 }
144
145 static int run_update_hook(struct command *cmd)
146 {
147 static const char update_hook[] = "hooks/update";
148 struct child_process proc;
149 const char *argv[5];
150
151 if (access(update_hook, X_OK) < 0)
152 return 0;
153
154 argv[0] = update_hook;
155 argv[1] = cmd->ref_name;
156 argv[2] = sha1_to_hex(cmd->old_sha1);
157 argv[3] = sha1_to_hex(cmd->new_sha1);
158 argv[4] = NULL;
159
160 memset(&proc, 0, sizeof(proc));
161 proc.argv = argv;
162 proc.no_stdin = 1;
163 proc.stdout_to_stderr = 1;
164
165 return hook_status(run_command(&proc), update_hook);
166 }
167
168 static const char *update(struct command *cmd)
169 {
170 const char *name = cmd->ref_name;
171 unsigned char *old_sha1 = cmd->old_sha1;
172 unsigned char *new_sha1 = cmd->new_sha1;
173 struct ref_lock *lock;
174
175 /* only refs/... are allowed */
176 if (prefixcmp(name, "refs/") || check_ref_format(name + 5)) {
177 error("refusing to create funny ref '%s' remotely", name);
178 return "funny refname";
179 }
180
181 if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
182 error("unpack should have generated %s, "
183 "but I can't find it!", sha1_to_hex(new_sha1));
184 return "bad pack";
185 }
186 if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
187 !is_null_sha1(old_sha1) &&
188 !prefixcmp(name, "refs/heads/")) {
189 struct object *old_object, *new_object;
190 struct commit *old_commit, *new_commit;
191 struct commit_list *bases, *ent;
192
193 old_object = parse_object(old_sha1);
194 new_object = parse_object(new_sha1);
195
196 if (!old_object || !new_object ||
197 old_object->type != OBJ_COMMIT ||
198 new_object->type != OBJ_COMMIT) {
199 error("bad sha1 objects for %s", name);
200 return "bad ref";
201 }
202 old_commit = (struct commit *)old_object;
203 new_commit = (struct commit *)new_object;
204 bases = get_merge_bases(old_commit, new_commit, 1);
205 for (ent = bases; ent; ent = ent->next)
206 if (!hashcmp(old_sha1, ent->item->object.sha1))
207 break;
208 free_commit_list(bases);
209 if (!ent) {
210 error("denying non-fast forward %s"
211 " (you should pull first)", name);
212 return "non-fast forward";
213 }
214 }
215 if (run_update_hook(cmd)) {
216 error("hook declined to update %s", name);
217 return "hook declined";
218 }
219
220 if (is_null_sha1(new_sha1)) {
221 if (!parse_object(old_sha1)) {
222 warning ("Allowing deletion of corrupt ref.");
223 old_sha1 = NULL;
224 }
225 if (delete_ref(name, old_sha1)) {
226 error("failed to delete %s", name);
227 return "failed to delete";
228 }
229 return NULL; /* good */
230 }
231 else {
232 lock = lock_any_ref_for_update(name, old_sha1, 0);
233 if (!lock) {
234 error("failed to lock %s", name);
235 return "failed to lock";
236 }
237 if (write_ref_sha1(lock, new_sha1, "push")) {
238 return "failed to write"; /* error() already called */
239 }
240 return NULL; /* good */
241 }
242 }
243
244 static char update_post_hook[] = "hooks/post-update";
245
246 static void run_update_post_hook(struct command *cmd)
247 {
248 struct command *cmd_p;
249 int argc;
250 const char **argv;
251
252 for (argc = 0, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
253 if (cmd_p->error_string)
254 continue;
255 argc++;
256 }
257 if (!argc || access(update_post_hook, X_OK) < 0)
258 return;
259 argv = xmalloc(sizeof(*argv) * (2 + argc));
260 argv[0] = update_post_hook;
261
262 for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
263 char *p;
264 if (cmd_p->error_string)
265 continue;
266 p = xmalloc(strlen(cmd_p->ref_name) + 1);
267 strcpy(p, cmd_p->ref_name);
268 argv[argc] = p;
269 argc++;
270 }
271 argv[argc] = NULL;
272 run_command_v_opt(argv, RUN_COMMAND_NO_STDIN
273 | RUN_COMMAND_STDOUT_TO_STDERR);
274 }
275
276 static void execute_commands(const char *unpacker_error)
277 {
278 struct command *cmd = commands;
279
280 if (unpacker_error) {
281 while (cmd) {
282 cmd->error_string = "n/a (unpacker error)";
283 cmd = cmd->next;
284 }
285 return;
286 }
287
288 if (run_hook(pre_receive_hook)) {
289 while (cmd) {
290 cmd->error_string = "pre-receive hook declined";
291 cmd = cmd->next;
292 }
293 return;
294 }
295
296 while (cmd) {
297 cmd->error_string = update(cmd);
298 cmd = cmd->next;
299 }
300 }
301
302 static void read_head_info(void)
303 {
304 struct command **p = &commands;
305 for (;;) {
306 static char line[1000];
307 unsigned char old_sha1[20], new_sha1[20];
308 struct command *cmd;
309 char *refname;
310 int len, reflen;
311
312 len = packet_read_line(0, line, sizeof(line));
313 if (!len)
314 break;
315 if (line[len-1] == '\n')
316 line[--len] = 0;
317 if (len < 83 ||
318 line[40] != ' ' ||
319 line[81] != ' ' ||
320 get_sha1_hex(line, old_sha1) ||
321 get_sha1_hex(line + 41, new_sha1))
322 die("protocol error: expected old/new/ref, got '%s'",
323 line);
324
325 refname = line + 82;
326 reflen = strlen(refname);
327 if (reflen + 82 < len) {
328 if (strstr(refname + reflen + 1, "report-status"))
329 report_status = 1;
330 }
331 cmd = xmalloc(sizeof(struct command) + len - 80);
332 hashcpy(cmd->old_sha1, old_sha1);
333 hashcpy(cmd->new_sha1, new_sha1);
334 memcpy(cmd->ref_name, line + 82, len - 81);
335 cmd->error_string = NULL;
336 cmd->next = NULL;
337 *p = cmd;
338 p = &cmd->next;
339 }
340 }
341
342 static const char *parse_pack_header(struct pack_header *hdr)
343 {
344 switch (read_pack_header(0, hdr)) {
345 case PH_ERROR_EOF:
346 return "eof before pack header was fully read";
347
348 case PH_ERROR_PACK_SIGNATURE:
349 return "protocol error (pack signature mismatch detected)";
350
351 case PH_ERROR_PROTOCOL:
352 return "protocol error (pack version unsupported)";
353
354 default:
355 return "unknown error in parse_pack_header";
356
357 case 0:
358 return NULL;
359 }
360 }
361
362 static const char *pack_lockfile;
363
364 static const char *unpack(void)
365 {
366 struct pack_header hdr;
367 const char *hdr_err;
368 char hdr_arg[38];
369
370 hdr_err = parse_pack_header(&hdr);
371 if (hdr_err)
372 return hdr_err;
373 snprintf(hdr_arg, sizeof(hdr_arg), "--pack_header=%u,%u",
374 ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
375
376 if (ntohl(hdr.hdr_entries) < unpack_limit) {
377 int code, i = 0;
378 const char *unpacker[4];
379 unpacker[i++] = "unpack-objects";
380 if (receive_fsck_objects)
381 unpacker[i++] = "--strict";
382 unpacker[i++] = hdr_arg;
383 unpacker[i++] = NULL;
384 code = run_command_v_opt(unpacker, RUN_GIT_CMD);
385 switch (code) {
386 case 0:
387 return NULL;
388 case -ERR_RUN_COMMAND_FORK:
389 return "unpack fork failed";
390 case -ERR_RUN_COMMAND_EXEC:
391 return "unpack execute failed";
392 case -ERR_RUN_COMMAND_WAITPID:
393 return "waitpid failed";
394 case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
395 return "waitpid is confused";
396 case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
397 return "unpacker died of signal";
398 case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
399 return "unpacker died strangely";
400 default:
401 return "unpacker exited with error code";
402 }
403 } else {
404 const char *keeper[7];
405 int s, status, i = 0;
406 char keep_arg[256];
407 struct child_process ip;
408
409 s = sprintf(keep_arg, "--keep=receive-pack %i on ", getpid());
410 if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
411 strcpy(keep_arg + s, "localhost");
412
413 keeper[i++] = "index-pack";
414 keeper[i++] = "--stdin";
415 if (receive_fsck_objects)
416 keeper[i++] = "--strict";
417 keeper[i++] = "--fix-thin";
418 keeper[i++] = hdr_arg;
419 keeper[i++] = keep_arg;
420 keeper[i++] = NULL;
421 memset(&ip, 0, sizeof(ip));
422 ip.argv = keeper;
423 ip.out = -1;
424 ip.git_cmd = 1;
425 if (start_command(&ip))
426 return "index-pack fork failed";
427 pack_lockfile = index_pack_lockfile(ip.out);
428 close(ip.out);
429 status = finish_command(&ip);
430 if (!status) {
431 reprepare_packed_git();
432 return NULL;
433 }
434 return "index-pack abnormal exit";
435 }
436 }
437
438 static void report(const char *unpack_status)
439 {
440 struct command *cmd;
441 packet_write(1, "unpack %s\n",
442 unpack_status ? unpack_status : "ok");
443 for (cmd = commands; cmd; cmd = cmd->next) {
444 if (!cmd->error_string)
445 packet_write(1, "ok %s\n",
446 cmd->ref_name);
447 else
448 packet_write(1, "ng %s %s\n",
449 cmd->ref_name, cmd->error_string);
450 }
451 packet_flush(1);
452 }
453
454 static int delete_only(struct command *cmd)
455 {
456 while (cmd) {
457 if (!is_null_sha1(cmd->new_sha1))
458 return 0;
459 cmd = cmd->next;
460 }
461 return 1;
462 }
463
464 int main(int argc, char **argv)
465 {
466 int i;
467 char *dir = NULL;
468
469 argv++;
470 for (i = 1; i < argc; i++) {
471 char *arg = *argv++;
472
473 if (*arg == '-') {
474 /* Do flag handling here */
475 usage(receive_pack_usage);
476 }
477 if (dir)
478 usage(receive_pack_usage);
479 dir = arg;
480 }
481 if (!dir)
482 usage(receive_pack_usage);
483
484 setup_path(NULL);
485
486 if (!enter_repo(dir, 0))
487 die("'%s': unable to chdir or not a git archive", dir);
488
489 if (is_repository_shallow())
490 die("attempt to push into a shallow repository");
491
492 git_config(receive_pack_config, NULL);
493
494 if (0 <= transfer_unpack_limit)
495 unpack_limit = transfer_unpack_limit;
496 else if (0 <= receive_unpack_limit)
497 unpack_limit = receive_unpack_limit;
498
499 write_head_info();
500
501 /* EOF */
502 packet_flush(1);
503
504 read_head_info();
505 if (commands) {
506 const char *unpack_status = NULL;
507
508 if (!delete_only(commands))
509 unpack_status = unpack();
510 execute_commands(unpack_status);
511 if (pack_lockfile)
512 unlink(pack_lockfile);
513 if (report_status)
514 report(unpack_status);
515 run_hook(post_receive_hook);
516 run_update_post_hook(commands);
517 }
518 return 0;
519 }