Makefile: customization for supporting HP-UX
[git/fastimport.git] / receive-pack.c
blob326749583221d0f5e81f58608a23ab1dc1601177
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 return hook_status(finish_command(&proc), hook_name);
138 static int run_update_hook(struct command *cmd)
140 static const char update_hook[] = "hooks/update";
141 struct child_process proc;
142 const char *argv[5];
144 if (access(update_hook, X_OK) < 0)
145 return 0;
147 argv[0] = update_hook;
148 argv[1] = cmd->ref_name;
149 argv[2] = sha1_to_hex(cmd->old_sha1);
150 argv[3] = sha1_to_hex(cmd->new_sha1);
151 argv[4] = NULL;
153 memset(&proc, 0, sizeof(proc));
154 proc.argv = argv;
155 proc.no_stdin = 1;
156 proc.stdout_to_stderr = 1;
158 return hook_status(run_command(&proc), update_hook);
161 static const char *update(struct command *cmd)
163 const char *name = cmd->ref_name;
164 unsigned char *old_sha1 = cmd->old_sha1;
165 unsigned char *new_sha1 = cmd->new_sha1;
166 struct ref_lock *lock;
168 /* only refs/... are allowed */
169 if (prefixcmp(name, "refs/") || check_ref_format(name + 5)) {
170 error("refusing to create funny ref '%s' remotely", name);
171 return "funny refname";
174 if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
175 error("unpack should have generated %s, "
176 "but I can't find it!", sha1_to_hex(new_sha1));
177 return "bad pack";
179 if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
180 !is_null_sha1(old_sha1) &&
181 !prefixcmp(name, "refs/heads/")) {
182 struct object *old_object, *new_object;
183 struct commit *old_commit, *new_commit;
184 struct commit_list *bases, *ent;
186 old_object = parse_object(old_sha1);
187 new_object = parse_object(new_sha1);
189 if (!old_object || !new_object ||
190 old_object->type != OBJ_COMMIT ||
191 new_object->type != OBJ_COMMIT) {
192 error("bad sha1 objects for %s", name);
193 return "bad ref";
195 old_commit = (struct commit *)old_object;
196 new_commit = (struct commit *)new_object;
197 bases = get_merge_bases(old_commit, new_commit, 1);
198 for (ent = bases; ent; ent = ent->next)
199 if (!hashcmp(old_sha1, ent->item->object.sha1))
200 break;
201 free_commit_list(bases);
202 if (!ent) {
203 error("denying non-fast forward %s"
204 " (you should pull first)", name);
205 return "non-fast forward";
208 if (run_update_hook(cmd)) {
209 error("hook declined to update %s", name);
210 return "hook declined";
213 if (is_null_sha1(new_sha1)) {
214 if (!parse_object(old_sha1)) {
215 warning ("Allowing deletion of corrupt ref.");
216 old_sha1 = NULL;
218 if (delete_ref(name, old_sha1)) {
219 error("failed to delete %s", name);
220 return "failed to delete";
222 return NULL; /* good */
224 else {
225 lock = lock_any_ref_for_update(name, old_sha1, 0);
226 if (!lock) {
227 error("failed to lock %s", name);
228 return "failed to lock";
230 if (write_ref_sha1(lock, new_sha1, "push")) {
231 return "failed to write"; /* error() already called */
233 return NULL; /* good */
237 static char update_post_hook[] = "hooks/post-update";
239 static void run_update_post_hook(struct command *cmd)
241 struct command *cmd_p;
242 int argc;
243 const char **argv;
245 for (argc = 0, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
246 if (cmd_p->error_string)
247 continue;
248 argc++;
250 if (!argc || access(update_post_hook, X_OK) < 0)
251 return;
252 argv = xmalloc(sizeof(*argv) * (2 + argc));
253 argv[0] = update_post_hook;
255 for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
256 char *p;
257 if (cmd_p->error_string)
258 continue;
259 p = xmalloc(strlen(cmd_p->ref_name) + 1);
260 strcpy(p, cmd_p->ref_name);
261 argv[argc] = p;
262 argc++;
264 argv[argc] = NULL;
265 run_command_v_opt(argv, RUN_COMMAND_NO_STDIN
266 | RUN_COMMAND_STDOUT_TO_STDERR);
269 static void execute_commands(const char *unpacker_error)
271 struct command *cmd = commands;
273 if (unpacker_error) {
274 while (cmd) {
275 cmd->error_string = "n/a (unpacker error)";
276 cmd = cmd->next;
278 return;
281 if (run_hook(pre_receive_hook)) {
282 while (cmd) {
283 cmd->error_string = "pre-receive hook declined";
284 cmd = cmd->next;
286 return;
289 while (cmd) {
290 cmd->error_string = update(cmd);
291 cmd = cmd->next;
295 static void read_head_info(void)
297 struct command **p = &commands;
298 for (;;) {
299 static char line[1000];
300 unsigned char old_sha1[20], new_sha1[20];
301 struct command *cmd;
302 char *refname;
303 int len, reflen;
305 len = packet_read_line(0, line, sizeof(line));
306 if (!len)
307 break;
308 if (line[len-1] == '\n')
309 line[--len] = 0;
310 if (len < 83 ||
311 line[40] != ' ' ||
312 line[81] != ' ' ||
313 get_sha1_hex(line, old_sha1) ||
314 get_sha1_hex(line + 41, new_sha1))
315 die("protocol error: expected old/new/ref, got '%s'",
316 line);
318 refname = line + 82;
319 reflen = strlen(refname);
320 if (reflen + 82 < len) {
321 if (strstr(refname + reflen + 1, "report-status"))
322 report_status = 1;
324 cmd = xmalloc(sizeof(struct command) + len - 80);
325 hashcpy(cmd->old_sha1, old_sha1);
326 hashcpy(cmd->new_sha1, new_sha1);
327 memcpy(cmd->ref_name, line + 82, len - 81);
328 cmd->error_string = NULL;
329 cmd->next = NULL;
330 *p = cmd;
331 p = &cmd->next;
335 static const char *parse_pack_header(struct pack_header *hdr)
337 switch (read_pack_header(0, hdr)) {
338 case PH_ERROR_EOF:
339 return "eof before pack header was fully read";
341 case PH_ERROR_PACK_SIGNATURE:
342 return "protocol error (pack signature mismatch detected)";
344 case PH_ERROR_PROTOCOL:
345 return "protocol error (pack version unsupported)";
347 default:
348 return "unknown error in parse_pack_header";
350 case 0:
351 return NULL;
355 static const char *pack_lockfile;
357 static const char *unpack(void)
359 struct pack_header hdr;
360 const char *hdr_err;
361 char hdr_arg[38];
363 hdr_err = parse_pack_header(&hdr);
364 if (hdr_err)
365 return hdr_err;
366 snprintf(hdr_arg, sizeof(hdr_arg), "--pack_header=%u,%u",
367 ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
369 if (ntohl(hdr.hdr_entries) < unpack_limit) {
370 int code;
371 const char *unpacker[3];
372 unpacker[0] = "unpack-objects";
373 unpacker[1] = hdr_arg;
374 unpacker[2] = NULL;
375 code = run_command_v_opt(unpacker, RUN_GIT_CMD);
376 switch (code) {
377 case 0:
378 return NULL;
379 case -ERR_RUN_COMMAND_FORK:
380 return "unpack fork failed";
381 case -ERR_RUN_COMMAND_EXEC:
382 return "unpack execute failed";
383 case -ERR_RUN_COMMAND_WAITPID:
384 return "waitpid failed";
385 case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
386 return "waitpid is confused";
387 case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
388 return "unpacker died of signal";
389 case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
390 return "unpacker died strangely";
391 default:
392 return "unpacker exited with error code";
394 } else {
395 const char *keeper[6];
396 int s, status;
397 char keep_arg[256];
398 struct child_process ip;
400 s = sprintf(keep_arg, "--keep=receive-pack %i on ", getpid());
401 if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
402 strcpy(keep_arg + s, "localhost");
404 keeper[0] = "index-pack";
405 keeper[1] = "--stdin";
406 keeper[2] = "--fix-thin";
407 keeper[3] = hdr_arg;
408 keeper[4] = keep_arg;
409 keeper[5] = NULL;
410 memset(&ip, 0, sizeof(ip));
411 ip.argv = keeper;
412 ip.out = -1;
413 ip.git_cmd = 1;
414 if (start_command(&ip))
415 return "index-pack fork failed";
416 pack_lockfile = index_pack_lockfile(ip.out);
417 status = finish_command(&ip);
418 if (!status) {
419 reprepare_packed_git();
420 return NULL;
422 return "index-pack abnormal exit";
426 static void report(const char *unpack_status)
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);
439 packet_flush(1);
442 static int delete_only(struct command *cmd)
444 while (cmd) {
445 if (!is_null_sha1(cmd->new_sha1))
446 return 0;
447 cmd = cmd->next;
449 return 1;
452 int main(int argc, char **argv)
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);
465 if (dir)
466 usage(receive_pack_usage);
467 dir = arg;
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);
502 run_update_post_hook(commands);
504 return 0;