for-each-reflog: fix case for empty log directory
[git.git] / receive-pack.c
blob7311c822dd3af2c6a1cd8da47184428d5b627b3e
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 char update_hook[] = "hooks/update";
72 static int run_update_hook(const char *refname,
73 char *old_hex, char *new_hex)
75 int code;
77 if (access(update_hook, X_OK) < 0)
78 return 0;
79 code = run_command_opt(RUN_COMMAND_NO_STDIN
80 | RUN_COMMAND_STDOUT_TO_STDERR,
81 update_hook, refname, old_hex, new_hex, NULL);
82 switch (code) {
83 case 0:
84 return 0;
85 case -ERR_RUN_COMMAND_FORK:
86 return error("hook fork failed");
87 case -ERR_RUN_COMMAND_EXEC:
88 return error("hook execute failed");
89 case -ERR_RUN_COMMAND_WAITPID:
90 return error("waitpid failed");
91 case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
92 return error("waitpid is confused");
93 case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
94 return error("%s died of signal", update_hook);
95 case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
96 return error("%s died strangely", update_hook);
97 default:
98 error("%s exited with error code %d", update_hook, -code);
99 return -code;
103 static int update(struct command *cmd)
105 const char *name = cmd->ref_name;
106 unsigned char *old_sha1 = cmd->old_sha1;
107 unsigned char *new_sha1 = cmd->new_sha1;
108 char new_hex[41], old_hex[41];
109 struct ref_lock *lock;
111 cmd->error_string = NULL;
112 if (!strncmp(name, "refs/", 5) && check_ref_format(name + 5)) {
113 cmd->error_string = "funny refname";
114 return error("refusing to create funny ref '%s' locally",
115 name);
118 strcpy(new_hex, sha1_to_hex(new_sha1));
119 strcpy(old_hex, sha1_to_hex(old_sha1));
121 if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
122 cmd->error_string = "bad pack";
123 return error("unpack should have generated %s, "
124 "but I can't find it!", new_hex);
126 if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
127 !is_null_sha1(old_sha1) &&
128 !strncmp(name, "refs/heads/", 11)) {
129 struct commit *old_commit, *new_commit;
130 struct commit_list *bases, *ent;
132 old_commit = (struct commit *)parse_object(old_sha1);
133 new_commit = (struct commit *)parse_object(new_sha1);
134 bases = get_merge_bases(old_commit, new_commit, 1);
135 for (ent = bases; ent; ent = ent->next)
136 if (!hashcmp(old_sha1, ent->item->object.sha1))
137 break;
138 free_commit_list(bases);
139 if (!ent)
140 return error("denying non-fast forward;"
141 " you should pull first");
143 if (run_update_hook(name, old_hex, new_hex)) {
144 cmd->error_string = "hook declined";
145 return error("hook declined to update %s", name);
148 if (is_null_sha1(new_sha1)) {
149 if (delete_ref(name, old_sha1)) {
150 cmd->error_string = "failed to delete";
151 return error("failed to delete %s", name);
153 fprintf(stderr, "%s: %s -> deleted\n", name, old_hex);
155 else {
156 lock = lock_any_ref_for_update(name, old_sha1);
157 if (!lock) {
158 cmd->error_string = "failed to lock";
159 return error("failed to lock %s", name);
161 write_ref_sha1(lock, new_sha1, "push");
162 fprintf(stderr, "%s: %s -> %s\n", name, old_hex, new_hex);
164 return 0;
167 static char update_post_hook[] = "hooks/post-update";
169 static void run_update_post_hook(struct command *cmd)
171 struct command *cmd_p;
172 int argc;
173 const char **argv;
175 if (access(update_post_hook, X_OK) < 0)
176 return;
177 for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
178 if (cmd_p->error_string)
179 continue;
180 argc++;
182 argv = xmalloc(sizeof(*argv) * (1 + argc));
183 argv[0] = update_post_hook;
185 for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
186 char *p;
187 if (cmd_p->error_string)
188 continue;
189 p = xmalloc(strlen(cmd_p->ref_name) + 1);
190 strcpy(p, cmd_p->ref_name);
191 argv[argc] = p;
192 argc++;
194 argv[argc] = NULL;
195 run_command_v_opt(argv, RUN_COMMAND_NO_STDIN
196 | RUN_COMMAND_STDOUT_TO_STDERR);
200 * This gets called after(if) we've successfully
201 * unpacked the data payload.
203 static void execute_commands(void)
205 struct command *cmd = commands;
207 while (cmd) {
208 update(cmd);
209 cmd = cmd->next;
211 run_update_post_hook(commands);
214 static void read_head_info(void)
216 struct command **p = &commands;
217 for (;;) {
218 static char line[1000];
219 unsigned char old_sha1[20], new_sha1[20];
220 struct command *cmd;
221 char *refname;
222 int len, reflen;
224 len = packet_read_line(0, line, sizeof(line));
225 if (!len)
226 break;
227 if (line[len-1] == '\n')
228 line[--len] = 0;
229 if (len < 83 ||
230 line[40] != ' ' ||
231 line[81] != ' ' ||
232 get_sha1_hex(line, old_sha1) ||
233 get_sha1_hex(line + 41, new_sha1))
234 die("protocol error: expected old/new/ref, got '%s'",
235 line);
237 refname = line + 82;
238 reflen = strlen(refname);
239 if (reflen + 82 < len) {
240 if (strstr(refname + reflen + 1, "report-status"))
241 report_status = 1;
243 cmd = xmalloc(sizeof(struct command) + len - 80);
244 hashcpy(cmd->old_sha1, old_sha1);
245 hashcpy(cmd->new_sha1, new_sha1);
246 memcpy(cmd->ref_name, line + 82, len - 81);
247 cmd->error_string = "n/a (unpacker error)";
248 cmd->next = NULL;
249 *p = cmd;
250 p = &cmd->next;
254 static const char *parse_pack_header(struct pack_header *hdr)
256 switch (read_pack_header(0, hdr)) {
257 case PH_ERROR_EOF:
258 return "eof before pack header was fully read";
260 case PH_ERROR_PACK_SIGNATURE:
261 return "protocol error (pack signature mismatch detected)";
263 case PH_ERROR_PROTOCOL:
264 return "protocol error (pack version unsupported)";
266 default:
267 return "unknown error in parse_pack_header";
269 case 0:
270 return NULL;
274 static const char *pack_lockfile;
276 static const char *unpack(void)
278 struct pack_header hdr;
279 const char *hdr_err;
280 char hdr_arg[38];
282 hdr_err = parse_pack_header(&hdr);
283 if (hdr_err)
284 return hdr_err;
285 snprintf(hdr_arg, sizeof(hdr_arg), "--pack_header=%u,%u",
286 ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
288 if (ntohl(hdr.hdr_entries) < unpack_limit) {
289 int code;
290 const char *unpacker[3];
291 unpacker[0] = "unpack-objects";
292 unpacker[1] = hdr_arg;
293 unpacker[2] = NULL;
294 code = run_command_v_opt(unpacker, RUN_GIT_CMD);
295 switch (code) {
296 case 0:
297 return NULL;
298 case -ERR_RUN_COMMAND_FORK:
299 return "unpack fork failed";
300 case -ERR_RUN_COMMAND_EXEC:
301 return "unpack execute failed";
302 case -ERR_RUN_COMMAND_WAITPID:
303 return "waitpid failed";
304 case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
305 return "waitpid is confused";
306 case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
307 return "unpacker died of signal";
308 case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
309 return "unpacker died strangely";
310 default:
311 return "unpacker exited with error code";
313 } else {
314 const char *keeper[6];
315 int fd[2], s, len, status;
316 pid_t pid;
317 char keep_arg[256];
318 char packname[46];
320 s = sprintf(keep_arg, "--keep=receive-pack %i on ", getpid());
321 if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
322 strcpy(keep_arg + s, "localhost");
324 keeper[0] = "index-pack";
325 keeper[1] = "--stdin";
326 keeper[2] = "--fix-thin";
327 keeper[3] = hdr_arg;
328 keeper[4] = keep_arg;
329 keeper[5] = NULL;
331 if (pipe(fd) < 0)
332 return "index-pack pipe failed";
333 pid = fork();
334 if (pid < 0)
335 return "index-pack fork failed";
336 if (!pid) {
337 dup2(fd[1], 1);
338 close(fd[1]);
339 close(fd[0]);
340 execv_git_cmd(keeper);
341 die("execv of index-pack failed");
343 close(fd[1]);
346 * The first thing we expects from index-pack's output
347 * is "pack\t%40s\n" or "keep\t%40s\n" (46 bytes) where
348 * %40s is the newly created pack SHA1 name. In the "keep"
349 * case, we need it to remove the corresponding .keep file
350 * later on. If we don't get that then tough luck with it.
352 for (len = 0;
353 len < 46 && (s = xread(fd[0], packname+len, 46-len)) > 0;
354 len += s);
355 close(fd[0]);
356 if (len == 46 && packname[45] == '\n' &&
357 memcmp(packname, "keep\t", 5) == 0) {
358 char path[PATH_MAX];
359 packname[45] = 0;
360 snprintf(path, sizeof(path), "%s/pack/pack-%s.keep",
361 get_object_directory(), packname + 5);
362 pack_lockfile = xstrdup(path);
365 /* Then wrap our index-pack process. */
366 while (waitpid(pid, &status, 0) < 0)
367 if (errno != EINTR)
368 return "waitpid failed";
369 if (WIFEXITED(status)) {
370 int code = WEXITSTATUS(status);
371 if (code)
372 return "index-pack exited with error code";
373 reprepare_packed_git();
374 return NULL;
376 return "index-pack abnormal exit";
380 static void report(const char *unpack_status)
382 struct command *cmd;
383 packet_write(1, "unpack %s\n",
384 unpack_status ? unpack_status : "ok");
385 for (cmd = commands; cmd; cmd = cmd->next) {
386 if (!cmd->error_string)
387 packet_write(1, "ok %s\n",
388 cmd->ref_name);
389 else
390 packet_write(1, "ng %s %s\n",
391 cmd->ref_name, cmd->error_string);
393 packet_flush(1);
396 static int delete_only(struct command *cmd)
398 while (cmd) {
399 if (!is_null_sha1(cmd->new_sha1))
400 return 0;
401 cmd = cmd->next;
403 return 1;
406 int main(int argc, char **argv)
408 int i;
409 char *dir = NULL;
411 argv++;
412 for (i = 1; i < argc; i++) {
413 char *arg = *argv++;
415 if (*arg == '-') {
416 /* Do flag handling here */
417 usage(receive_pack_usage);
419 if (dir)
420 usage(receive_pack_usage);
421 dir = arg;
423 if (!dir)
424 usage(receive_pack_usage);
426 if (!enter_repo(dir, 0))
427 die("'%s': unable to chdir or not a git archive", dir);
429 if (is_repository_shallow())
430 die("attempt to push into a shallow repository");
432 git_config(receive_pack_config);
434 if (0 <= transfer_unpack_limit)
435 unpack_limit = transfer_unpack_limit;
436 else if (0 <= receive_unpack_limit)
437 unpack_limit = receive_unpack_limit;
439 write_head_info();
441 /* EOF */
442 packet_flush(1);
444 read_head_info();
445 if (commands) {
446 const char *unpack_status = NULL;
448 if (!delete_only(commands))
449 unpack_status = unpack();
450 if (!unpack_status)
451 execute_commands();
452 if (pack_lockfile)
453 unlink(pack_lockfile);
454 if (report_status)
455 report(unpack_status);
457 return 0;