Merge branch 'maint' of git://repo.or.cz/git-gui into maint
[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),
374                         "--pack_header=%"PRIu32",%"PRIu32,
375                         ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
376
377         if (ntohl(hdr.hdr_entries) < unpack_limit) {
378                 int code, i = 0;
379                 const char *unpacker[4];
380                 unpacker[i++] = "unpack-objects";
381                 if (receive_fsck_objects)
382                         unpacker[i++] = "--strict";
383                 unpacker[i++] = hdr_arg;
384                 unpacker[i++] = NULL;
385                 code = run_command_v_opt(unpacker, RUN_GIT_CMD);
386                 switch (code) {
387                 case 0:
388                         return NULL;
389                 case -ERR_RUN_COMMAND_FORK:
390                         return "unpack fork failed";
391                 case -ERR_RUN_COMMAND_EXEC:
392                         return "unpack execute failed";
393                 case -ERR_RUN_COMMAND_WAITPID:
394                         return "waitpid failed";
395                 case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
396                         return "waitpid is confused";
397                 case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
398                         return "unpacker died of signal";
399                 case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
400                         return "unpacker died strangely";
401                 default:
402                         return "unpacker exited with error code";
403                 }
404         } else {
405                 const char *keeper[7];
406                 int s, status, i = 0;
407                 char keep_arg[256];
408                 struct child_process ip;
409
410                 s = sprintf(keep_arg, "--keep=receive-pack %i on ", getpid());
411                 if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
412                         strcpy(keep_arg + s, "localhost");
413
414                 keeper[i++] = "index-pack";
415                 keeper[i++] = "--stdin";
416                 if (receive_fsck_objects)
417                         keeper[i++] = "--strict";
418                 keeper[i++] = "--fix-thin";
419                 keeper[i++] = hdr_arg;
420                 keeper[i++] = keep_arg;
421                 keeper[i++] = NULL;
422                 memset(&ip, 0, sizeof(ip));
423                 ip.argv = keeper;
424                 ip.out = -1;
425                 ip.git_cmd = 1;
426                 if (start_command(&ip))
427                         return "index-pack fork failed";
428                 pack_lockfile = index_pack_lockfile(ip.out);
429                 close(ip.out);
430                 status = finish_command(&ip);
431                 if (!status) {
432                         reprepare_packed_git();
433                         return NULL;
434                 }
435                 return "index-pack abnormal exit";
436         }
437 }
438
439 static void report(const char *unpack_status)
440 {
441         struct command *cmd;
442         packet_write(1, "unpack %s\n",
443                      unpack_status ? unpack_status : "ok");
444         for (cmd = commands; cmd; cmd = cmd->next) {
445                 if (!cmd->error_string)
446                         packet_write(1, "ok %s\n",
447                                      cmd->ref_name);
448                 else
449                         packet_write(1, "ng %s %s\n",
450                                      cmd->ref_name, cmd->error_string);
451         }
452         packet_flush(1);
453 }
454
455 static int delete_only(struct command *cmd)
456 {
457         while (cmd) {
458                 if (!is_null_sha1(cmd->new_sha1))
459                         return 0;
460                 cmd = cmd->next;
461         }
462         return 1;
463 }
464
465 int main(int argc, char **argv)
466 {
467         int i;
468         char *dir = NULL;
469
470         argv++;
471         for (i = 1; i < argc; i++) {
472                 char *arg = *argv++;
473
474                 if (*arg == '-') {
475                         /* Do flag handling here */
476                         usage(receive_pack_usage);
477                 }
478                 if (dir)
479                         usage(receive_pack_usage);
480                 dir = arg;
481         }
482         if (!dir)
483                 usage(receive_pack_usage);
484
485         setup_path();
486
487         if (!enter_repo(dir, 0))
488                 die("'%s': unable to chdir or not a git archive", dir);
489
490         if (is_repository_shallow())
491                 die("attempt to push into a shallow repository");
492
493         git_config(receive_pack_config, NULL);
494
495         if (0 <= transfer_unpack_limit)
496                 unpack_limit = transfer_unpack_limit;
497         else if (0 <= receive_unpack_limit)
498                 unpack_limit = receive_unpack_limit;
499
500         write_head_info();
501
502         /* EOF */
503         packet_flush(1);
504
505         read_head_info();
506         if (commands) {
507                 const char *unpack_status = NULL;
508
509                 if (!delete_only(commands))
510                         unpack_status = unpack();
511                 execute_commands(unpack_status);
512                 if (pack_lockfile)
513                         unlink(pack_lockfile);
514                 if (report_status)
515                         report(unpack_status);
516                 run_hook(post_receive_hook);
517                 run_update_post_hook(commands);
518         }
519         return 0;
520 }