gitk: Second try to work around the command line limit on Windows
[git/dscho.git] / builtin / receive-pack.c
blob0559fcc871894548050e99c8c258561a0dcad5c9
1 #include "cache.h"
2 #include "pack.h"
3 #include "refs.h"
4 #include "pkt-line.h"
5 #include "sideband.h"
6 #include "run-command.h"
7 #include "exec_cmd.h"
8 #include "commit.h"
9 #include "object.h"
10 #include "remote.h"
11 #include "transport.h"
13 static const char receive_pack_usage[] = "git receive-pack <git-dir>";
15 enum deny_action {
16 DENY_UNCONFIGURED,
17 DENY_IGNORE,
18 DENY_WARN,
19 DENY_REFUSE,
22 static int deny_deletes;
23 static int deny_non_fast_forwards;
24 static enum deny_action deny_current_branch = DENY_UNCONFIGURED;
25 static enum deny_action deny_delete_current = DENY_UNCONFIGURED;
26 static int receive_fsck_objects;
27 static int receive_unpack_limit = -1;
28 static int transfer_unpack_limit = -1;
29 static int unpack_limit = 100;
30 static int report_status;
31 static int use_sideband;
32 static int prefer_ofs_delta = 1;
33 static int auto_update_server_info;
34 static int auto_gc = 1;
35 static const char *head_name;
36 static int sent_capabilities;
38 static enum deny_action parse_deny_action(const char *var, const char *value)
40 if (value) {
41 if (!strcasecmp(value, "ignore"))
42 return DENY_IGNORE;
43 if (!strcasecmp(value, "warn"))
44 return DENY_WARN;
45 if (!strcasecmp(value, "refuse"))
46 return DENY_REFUSE;
48 if (git_config_bool(var, value))
49 return DENY_REFUSE;
50 return DENY_IGNORE;
53 static int receive_pack_config(const char *var, const char *value, void *cb)
55 if (strcmp(var, "receive.denydeletes") == 0) {
56 deny_deletes = git_config_bool(var, value);
57 return 0;
60 if (strcmp(var, "receive.denynonfastforwards") == 0) {
61 deny_non_fast_forwards = git_config_bool(var, value);
62 return 0;
65 if (strcmp(var, "receive.unpacklimit") == 0) {
66 receive_unpack_limit = git_config_int(var, value);
67 return 0;
70 if (strcmp(var, "transfer.unpacklimit") == 0) {
71 transfer_unpack_limit = git_config_int(var, value);
72 return 0;
75 if (strcmp(var, "receive.fsckobjects") == 0) {
76 receive_fsck_objects = git_config_bool(var, value);
77 return 0;
80 if (!strcmp(var, "receive.denycurrentbranch")) {
81 deny_current_branch = parse_deny_action(var, value);
82 return 0;
85 if (strcmp(var, "receive.denydeletecurrent") == 0) {
86 deny_delete_current = parse_deny_action(var, value);
87 return 0;
90 if (strcmp(var, "repack.usedeltabaseoffset") == 0) {
91 prefer_ofs_delta = git_config_bool(var, value);
92 return 0;
95 if (strcmp(var, "receive.updateserverinfo") == 0) {
96 auto_update_server_info = git_config_bool(var, value);
97 return 0;
100 if (strcmp(var, "receive.autogc") == 0) {
101 auto_gc = git_config_bool(var, value);
102 return 0;
105 return git_default_config(var, value, cb);
108 static int show_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
110 if (sent_capabilities)
111 packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
112 else
113 packet_write(1, "%s %s%c%s%s\n",
114 sha1_to_hex(sha1), path, 0,
115 " report-status delete-refs side-band-64k",
116 prefer_ofs_delta ? " ofs-delta" : "");
117 sent_capabilities = 1;
118 return 0;
121 static void write_head_info(void)
123 for_each_ref(show_ref, NULL);
124 if (!sent_capabilities)
125 show_ref("capabilities^{}", null_sha1, 0, NULL);
129 struct command {
130 struct command *next;
131 const char *error_string;
132 unsigned char old_sha1[20];
133 unsigned char new_sha1[20];
134 char ref_name[FLEX_ARRAY]; /* more */
137 static struct command *commands;
139 static const char pre_receive_hook[] = "hooks/pre-receive";
140 static const char post_receive_hook[] = "hooks/post-receive";
142 static void rp_error(const char *err, ...) __attribute__((format (printf, 1, 2)));
143 static void rp_warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
145 static void report_message(const char *prefix, const char *err, va_list params)
147 int sz = strlen(prefix);
148 char msg[4096];
150 strncpy(msg, prefix, sz);
151 sz += vsnprintf(msg + sz, sizeof(msg) - sz, err, params);
152 if (sz > (sizeof(msg) - 1))
153 sz = sizeof(msg) - 1;
154 msg[sz++] = '\n';
156 if (use_sideband)
157 send_sideband(1, 2, msg, sz, use_sideband);
158 else
159 xwrite(2, msg, sz);
162 static void rp_warning(const char *err, ...)
164 va_list params;
165 va_start(params, err);
166 report_message("warning: ", err, params);
167 va_end(params);
170 static void rp_error(const char *err, ...)
172 va_list params;
173 va_start(params, err);
174 report_message("error: ", err, params);
175 va_end(params);
178 static int copy_to_sideband(int in, int out, void *arg)
180 char data[128];
181 while (1) {
182 ssize_t sz = xread(in, data, sizeof(data));
183 if (sz <= 0)
184 break;
185 send_sideband(1, 2, data, sz, use_sideband);
187 close(in);
188 return 0;
191 static int run_receive_hook(const char *hook_name)
193 static char buf[sizeof(commands->old_sha1) * 2 + PATH_MAX + 4];
194 struct command *cmd;
195 struct child_process proc;
196 struct async muxer;
197 const char *argv[2];
198 int have_input = 0, code;
200 for (cmd = commands; !have_input && cmd; cmd = cmd->next) {
201 if (!cmd->error_string)
202 have_input = 1;
205 if (!have_input || access(hook_name, X_OK) < 0)
206 return 0;
208 argv[0] = hook_name;
209 argv[1] = NULL;
211 memset(&proc, 0, sizeof(proc));
212 proc.argv = argv;
213 proc.in = -1;
214 proc.stdout_to_stderr = 1;
216 if (use_sideband) {
217 memset(&muxer, 0, sizeof(muxer));
218 muxer.proc = copy_to_sideband;
219 muxer.in = -1;
220 code = start_async(&muxer);
221 if (code)
222 return code;
223 proc.err = muxer.in;
226 code = start_command(&proc);
227 if (code) {
228 if (use_sideband)
229 finish_async(&muxer);
230 return code;
233 for (cmd = commands; cmd; cmd = cmd->next) {
234 if (!cmd->error_string) {
235 size_t n = snprintf(buf, sizeof(buf), "%s %s %s\n",
236 sha1_to_hex(cmd->old_sha1),
237 sha1_to_hex(cmd->new_sha1),
238 cmd->ref_name);
239 if (write_in_full(proc.in, buf, n) != n)
240 break;
243 close(proc.in);
244 if (use_sideband)
245 finish_async(&muxer);
246 return finish_command(&proc);
249 static int run_update_hook(struct command *cmd)
251 static const char update_hook[] = "hooks/update";
252 const char *argv[5];
253 struct child_process proc;
254 int code;
256 if (access(update_hook, X_OK) < 0)
257 return 0;
259 argv[0] = update_hook;
260 argv[1] = cmd->ref_name;
261 argv[2] = sha1_to_hex(cmd->old_sha1);
262 argv[3] = sha1_to_hex(cmd->new_sha1);
263 argv[4] = NULL;
265 memset(&proc, 0, sizeof(proc));
266 proc.no_stdin = 1;
267 proc.stdout_to_stderr = 1;
268 proc.err = use_sideband ? -1 : 0;
269 proc.argv = argv;
271 code = start_command(&proc);
272 if (code)
273 return code;
274 if (use_sideband)
275 copy_to_sideband(proc.err, -1, NULL);
276 return finish_command(&proc);
279 static int is_ref_checked_out(const char *ref)
281 if (is_bare_repository())
282 return 0;
284 if (!head_name)
285 return 0;
286 return !strcmp(head_name, ref);
289 static char *refuse_unconfigured_deny_msg[] = {
290 "By default, updating the current branch in a non-bare repository",
291 "is denied, because it will make the index and work tree inconsistent",
292 "with what you pushed, and will require 'git reset --hard' to match",
293 "the work tree to HEAD.",
295 "You can set 'receive.denyCurrentBranch' configuration variable to",
296 "'ignore' or 'warn' in the remote repository to allow pushing into",
297 "its current branch; however, this is not recommended unless you",
298 "arranged to update its work tree to match what you pushed in some",
299 "other way.",
301 "To squelch this message and still keep the default behaviour, set",
302 "'receive.denyCurrentBranch' configuration variable to 'refuse'."
305 static void refuse_unconfigured_deny(void)
307 int i;
308 for (i = 0; i < ARRAY_SIZE(refuse_unconfigured_deny_msg); i++)
309 rp_error("%s", refuse_unconfigured_deny_msg[i]);
312 static char *refuse_unconfigured_deny_delete_current_msg[] = {
313 "By default, deleting the current branch is denied, because the next",
314 "'git clone' won't result in any file checked out, causing confusion.",
316 "You can set 'receive.denyDeleteCurrent' configuration variable to",
317 "'warn' or 'ignore' in the remote repository to allow deleting the",
318 "current branch, with or without a warning message.",
320 "To squelch this message, you can set it to 'refuse'."
323 static void refuse_unconfigured_deny_delete_current(void)
325 int i;
326 for (i = 0;
327 i < ARRAY_SIZE(refuse_unconfigured_deny_delete_current_msg);
328 i++)
329 rp_error("%s", refuse_unconfigured_deny_delete_current_msg[i]);
332 static const char *update(struct command *cmd)
334 const char *name = cmd->ref_name;
335 unsigned char *old_sha1 = cmd->old_sha1;
336 unsigned char *new_sha1 = cmd->new_sha1;
337 struct ref_lock *lock;
339 /* only refs/... are allowed */
340 if (prefixcmp(name, "refs/") || check_ref_format(name + 5)) {
341 rp_error("refusing to create funny ref '%s' remotely", name);
342 return "funny refname";
345 if (is_ref_checked_out(name)) {
346 switch (deny_current_branch) {
347 case DENY_IGNORE:
348 break;
349 case DENY_WARN:
350 rp_warning("updating the current branch");
351 break;
352 case DENY_REFUSE:
353 case DENY_UNCONFIGURED:
354 rp_error("refusing to update checked out branch: %s", name);
355 if (deny_current_branch == DENY_UNCONFIGURED)
356 refuse_unconfigured_deny();
357 return "branch is currently checked out";
361 if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
362 error("unpack should have generated %s, "
363 "but I can't find it!", sha1_to_hex(new_sha1));
364 return "bad pack";
367 if (!is_null_sha1(old_sha1) && is_null_sha1(new_sha1)) {
368 if (deny_deletes && !prefixcmp(name, "refs/heads/")) {
369 rp_error("denying ref deletion for %s", name);
370 return "deletion prohibited";
373 if (!strcmp(name, head_name)) {
374 switch (deny_delete_current) {
375 case DENY_IGNORE:
376 break;
377 case DENY_WARN:
378 rp_warning("deleting the current branch");
379 break;
380 case DENY_REFUSE:
381 case DENY_UNCONFIGURED:
382 if (deny_delete_current == DENY_UNCONFIGURED)
383 refuse_unconfigured_deny_delete_current();
384 rp_error("refusing to delete the current branch: %s", name);
385 return "deletion of the current branch prohibited";
390 if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
391 !is_null_sha1(old_sha1) &&
392 !prefixcmp(name, "refs/heads/")) {
393 struct object *old_object, *new_object;
394 struct commit *old_commit, *new_commit;
395 struct commit_list *bases, *ent;
397 old_object = parse_object(old_sha1);
398 new_object = parse_object(new_sha1);
400 if (!old_object || !new_object ||
401 old_object->type != OBJ_COMMIT ||
402 new_object->type != OBJ_COMMIT) {
403 error("bad sha1 objects for %s", name);
404 return "bad ref";
406 old_commit = (struct commit *)old_object;
407 new_commit = (struct commit *)new_object;
408 bases = get_merge_bases(old_commit, new_commit, 1);
409 for (ent = bases; ent; ent = ent->next)
410 if (!hashcmp(old_sha1, ent->item->object.sha1))
411 break;
412 free_commit_list(bases);
413 if (!ent) {
414 rp_error("denying non-fast-forward %s"
415 " (you should pull first)", name);
416 return "non-fast-forward";
419 if (run_update_hook(cmd)) {
420 rp_error("hook declined to update %s", name);
421 return "hook declined";
424 if (is_null_sha1(new_sha1)) {
425 if (!parse_object(old_sha1)) {
426 rp_warning("Allowing deletion of corrupt ref.");
427 old_sha1 = NULL;
429 if (delete_ref(name, old_sha1, 0)) {
430 rp_error("failed to delete %s", name);
431 return "failed to delete";
433 return NULL; /* good */
435 else {
436 lock = lock_any_ref_for_update(name, old_sha1, 0);
437 if (!lock) {
438 rp_error("failed to lock %s", name);
439 return "failed to lock";
441 if (write_ref_sha1(lock, new_sha1, "push")) {
442 return "failed to write"; /* error() already called */
444 return NULL; /* good */
448 static char update_post_hook[] = "hooks/post-update";
450 static void run_update_post_hook(struct command *cmd)
452 struct command *cmd_p;
453 int argc;
454 const char **argv;
455 struct child_process proc;
457 for (argc = 0, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
458 if (cmd_p->error_string)
459 continue;
460 argc++;
462 if (!argc || access(update_post_hook, X_OK) < 0)
463 return;
464 argv = xmalloc(sizeof(*argv) * (2 + argc));
465 argv[0] = update_post_hook;
467 for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
468 char *p;
469 if (cmd_p->error_string)
470 continue;
471 p = xmalloc(strlen(cmd_p->ref_name) + 1);
472 strcpy(p, cmd_p->ref_name);
473 argv[argc] = p;
474 argc++;
476 argv[argc] = NULL;
478 memset(&proc, 0, sizeof(proc));
479 proc.no_stdin = 1;
480 proc.stdout_to_stderr = 1;
481 proc.err = use_sideband ? -1 : 0;
482 proc.argv = argv;
484 if (!start_command(&proc)) {
485 if (use_sideband)
486 copy_to_sideband(proc.err, -1, NULL);
487 finish_command(&proc);
491 static void execute_commands(const char *unpacker_error)
493 struct command *cmd = commands;
494 unsigned char sha1[20];
496 if (unpacker_error) {
497 while (cmd) {
498 cmd->error_string = "n/a (unpacker error)";
499 cmd = cmd->next;
501 return;
504 if (run_receive_hook(pre_receive_hook)) {
505 while (cmd) {
506 cmd->error_string = "pre-receive hook declined";
507 cmd = cmd->next;
509 return;
512 head_name = resolve_ref("HEAD", sha1, 0, NULL);
514 while (cmd) {
515 cmd->error_string = update(cmd);
516 cmd = cmd->next;
520 static void read_head_info(void)
522 struct command **p = &commands;
523 for (;;) {
524 static char line[1000];
525 unsigned char old_sha1[20], new_sha1[20];
526 struct command *cmd;
527 char *refname;
528 int len, reflen;
530 len = packet_read_line(0, line, sizeof(line));
531 if (!len)
532 break;
533 if (line[len-1] == '\n')
534 line[--len] = 0;
535 if (len < 83 ||
536 line[40] != ' ' ||
537 line[81] != ' ' ||
538 get_sha1_hex(line, old_sha1) ||
539 get_sha1_hex(line + 41, new_sha1))
540 die("protocol error: expected old/new/ref, got '%s'",
541 line);
543 refname = line + 82;
544 reflen = strlen(refname);
545 if (reflen + 82 < len) {
546 if (strstr(refname + reflen + 1, "report-status"))
547 report_status = 1;
548 if (strstr(refname + reflen + 1, "side-band-64k"))
549 use_sideband = LARGE_PACKET_MAX;
551 cmd = xmalloc(sizeof(struct command) + len - 80);
552 hashcpy(cmd->old_sha1, old_sha1);
553 hashcpy(cmd->new_sha1, new_sha1);
554 memcpy(cmd->ref_name, line + 82, len - 81);
555 cmd->error_string = NULL;
556 cmd->next = NULL;
557 *p = cmd;
558 p = &cmd->next;
562 static const char *parse_pack_header(struct pack_header *hdr)
564 switch (read_pack_header(0, hdr)) {
565 case PH_ERROR_EOF:
566 return "eof before pack header was fully read";
568 case PH_ERROR_PACK_SIGNATURE:
569 return "protocol error (pack signature mismatch detected)";
571 case PH_ERROR_PROTOCOL:
572 return "protocol error (pack version unsupported)";
574 default:
575 return "unknown error in parse_pack_header";
577 case 0:
578 return NULL;
582 static const char *pack_lockfile;
584 static const char *unpack(void)
586 struct pack_header hdr;
587 const char *hdr_err;
588 char hdr_arg[38];
590 hdr_err = parse_pack_header(&hdr);
591 if (hdr_err)
592 return hdr_err;
593 snprintf(hdr_arg, sizeof(hdr_arg),
594 "--pack_header=%"PRIu32",%"PRIu32,
595 ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
597 if (ntohl(hdr.hdr_entries) < unpack_limit) {
598 int code, i = 0;
599 const char *unpacker[4];
600 unpacker[i++] = "unpack-objects";
601 if (receive_fsck_objects)
602 unpacker[i++] = "--strict";
603 unpacker[i++] = hdr_arg;
604 unpacker[i++] = NULL;
605 code = run_command_v_opt(unpacker, RUN_GIT_CMD);
606 if (!code)
607 return NULL;
608 return "unpack-objects abnormal exit";
609 } else {
610 const char *keeper[7];
611 int s, status, i = 0;
612 char keep_arg[256];
613 struct child_process ip;
615 s = sprintf(keep_arg, "--keep=receive-pack %"PRIuMAX" on ", (uintmax_t) getpid());
616 if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
617 strcpy(keep_arg + s, "localhost");
619 keeper[i++] = "index-pack";
620 keeper[i++] = "--stdin";
621 if (receive_fsck_objects)
622 keeper[i++] = "--strict";
623 keeper[i++] = "--fix-thin";
624 keeper[i++] = hdr_arg;
625 keeper[i++] = keep_arg;
626 keeper[i++] = NULL;
627 memset(&ip, 0, sizeof(ip));
628 ip.argv = keeper;
629 ip.out = -1;
630 ip.git_cmd = 1;
631 status = start_command(&ip);
632 if (status) {
633 return "index-pack fork failed";
635 pack_lockfile = index_pack_lockfile(ip.out);
636 close(ip.out);
637 status = finish_command(&ip);
638 if (!status) {
639 reprepare_packed_git();
640 return NULL;
642 return "index-pack abnormal exit";
646 static void report(const char *unpack_status)
648 struct command *cmd;
649 struct strbuf buf = STRBUF_INIT;
651 packet_buf_write(&buf, "unpack %s\n",
652 unpack_status ? unpack_status : "ok");
653 for (cmd = commands; cmd; cmd = cmd->next) {
654 if (!cmd->error_string)
655 packet_buf_write(&buf, "ok %s\n",
656 cmd->ref_name);
657 else
658 packet_buf_write(&buf, "ng %s %s\n",
659 cmd->ref_name, cmd->error_string);
661 packet_buf_flush(&buf);
663 if (use_sideband)
664 send_sideband(1, 1, buf.buf, buf.len, use_sideband);
665 else
666 safe_write(1, buf.buf, buf.len);
667 strbuf_release(&buf);
670 static int delete_only(struct command *cmd)
672 while (cmd) {
673 if (!is_null_sha1(cmd->new_sha1))
674 return 0;
675 cmd = cmd->next;
677 return 1;
680 static int add_refs_from_alternate(struct alternate_object_database *e, void *unused)
682 char *other;
683 size_t len;
684 struct remote *remote;
685 struct transport *transport;
686 const struct ref *extra;
688 e->name[-1] = '\0';
689 other = xstrdup(make_absolute_path(e->base));
690 e->name[-1] = '/';
691 len = strlen(other);
693 while (other[len-1] == '/')
694 other[--len] = '\0';
695 if (len < 8 || memcmp(other + len - 8, "/objects", 8))
696 return 0;
697 /* Is this a git repository with refs? */
698 memcpy(other + len - 8, "/refs", 6);
699 if (!is_directory(other))
700 return 0;
701 other[len - 8] = '\0';
702 remote = remote_get(other);
703 transport = transport_get(remote, other);
704 for (extra = transport_get_remote_refs(transport);
705 extra;
706 extra = extra->next) {
707 add_extra_ref(".have", extra->old_sha1, 0);
709 transport_disconnect(transport);
710 free(other);
711 return 0;
714 static void add_alternate_refs(void)
716 foreach_alt_odb(add_refs_from_alternate, NULL);
719 int cmd_receive_pack(int argc, const char **argv, const char *prefix)
721 int advertise_refs = 0;
722 int stateless_rpc = 0;
723 int i;
724 char *dir = NULL;
726 argv++;
727 for (i = 1; i < argc; i++) {
728 const char *arg = *argv++;
730 if (*arg == '-') {
731 if (!strcmp(arg, "--advertise-refs")) {
732 advertise_refs = 1;
733 continue;
735 if (!strcmp(arg, "--stateless-rpc")) {
736 stateless_rpc = 1;
737 continue;
740 usage(receive_pack_usage);
742 if (dir)
743 usage(receive_pack_usage);
744 dir = xstrdup(arg);
746 if (!dir)
747 usage(receive_pack_usage);
749 setup_path();
751 if (!enter_repo(dir, 0))
752 die("'%s' does not appear to be a git repository", dir);
754 if (is_repository_shallow())
755 die("attempt to push into a shallow repository");
757 git_config(receive_pack_config, NULL);
759 if (0 <= transfer_unpack_limit)
760 unpack_limit = transfer_unpack_limit;
761 else if (0 <= receive_unpack_limit)
762 unpack_limit = receive_unpack_limit;
764 if (advertise_refs || !stateless_rpc) {
765 add_alternate_refs();
766 write_head_info();
767 clear_extra_refs();
769 /* EOF */
770 packet_flush(1);
772 if (advertise_refs)
773 return 0;
775 read_head_info();
776 if (commands) {
777 const char *unpack_status = NULL;
779 if (!delete_only(commands))
780 unpack_status = unpack();
781 execute_commands(unpack_status);
782 if (pack_lockfile)
783 unlink_or_warn(pack_lockfile);
784 if (report_status)
785 report(unpack_status);
786 run_receive_hook(post_receive_hook);
787 run_update_post_hook(commands);
788 if (auto_gc) {
789 const char *argv_gc_auto[] = {
790 "gc", "--auto", "--quiet", NULL,
792 run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
794 if (auto_update_server_info)
795 update_server_info(0);
797 if (use_sideband)
798 packet_flush(1);
799 return 0;