Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
tag: v1.6.6-rc0
Fetching contributors…

Cannot retrieve contributors at this time

file 711 lines (621 sloc) 17.565 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711
#include "cache.h"
#include "pack.h"
#include "refs.h"
#include "pkt-line.h"
#include "run-command.h"
#include "exec_cmd.h"
#include "commit.h"
#include "object.h"
#include "remote.h"
#include "transport.h"

static const char receive_pack_usage[] = "git receive-pack <git-dir>";

enum deny_action {
DENY_UNCONFIGURED,
DENY_IGNORE,
DENY_WARN,
DENY_REFUSE,
};

static int deny_deletes;
static int deny_non_fast_forwards;
static enum deny_action deny_current_branch = DENY_UNCONFIGURED;
static enum deny_action deny_delete_current = DENY_UNCONFIGURED;
static int receive_fsck_objects;
static int receive_unpack_limit = -1;
static int transfer_unpack_limit = -1;
static int unpack_limit = 100;
static int report_status;
static int prefer_ofs_delta = 1;
static int auto_update_server_info;
static int auto_gc = 1;
static const char *head_name;
static char *capabilities_to_send;

static enum deny_action parse_deny_action(const char *var, const char *value)
{
if (value) {
if (!strcasecmp(value, "ignore"))
return DENY_IGNORE;
if (!strcasecmp(value, "warn"))
return DENY_WARN;
if (!strcasecmp(value, "refuse"))
return DENY_REFUSE;
}
if (git_config_bool(var, value))
return DENY_REFUSE;
return DENY_IGNORE;
}

static int receive_pack_config(const char *var, const char *value, void *cb)
{
if (strcmp(var, "receive.denydeletes") == 0) {
deny_deletes = git_config_bool(var, value);
return 0;
}

if (strcmp(var, "receive.denynonfastforwards") == 0) {
deny_non_fast_forwards = git_config_bool(var, value);
return 0;
}

if (strcmp(var, "receive.unpacklimit") == 0) {
receive_unpack_limit = git_config_int(var, value);
return 0;
}

if (strcmp(var, "transfer.unpacklimit") == 0) {
transfer_unpack_limit = git_config_int(var, value);
return 0;
}

if (strcmp(var, "receive.fsckobjects") == 0) {
receive_fsck_objects = git_config_bool(var, value);
return 0;
}

if (!strcmp(var, "receive.denycurrentbranch")) {
deny_current_branch = parse_deny_action(var, value);
return 0;
}

if (strcmp(var, "receive.denydeletecurrent") == 0) {
deny_delete_current = parse_deny_action(var, value);
return 0;
}

if (strcmp(var, "repack.usedeltabaseoffset") == 0) {
prefer_ofs_delta = git_config_bool(var, value);
return 0;
}

if (strcmp(var, "receive.updateserverinfo") == 0) {
auto_update_server_info = git_config_bool(var, value);
return 0;
}

if (strcmp(var, "receive.autogc") == 0) {
auto_gc = git_config_bool(var, value);
return 0;
}

return git_default_config(var, value, cb);
}

static int show_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
{
if (!capabilities_to_send)
packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
else
packet_write(1, "%s %s%c%s\n",
sha1_to_hex(sha1), path, 0, capabilities_to_send);
capabilities_to_send = NULL;
return 0;
}

static void write_head_info(void)
{
for_each_ref(show_ref, NULL);
if (capabilities_to_send)
show_ref("capabilities^{}", null_sha1, 0, NULL);

}

struct command {
struct command *next;
const char *error_string;
unsigned char old_sha1[20];
unsigned char new_sha1[20];
char ref_name[FLEX_ARRAY]; /* more */
};

static struct command *commands;

static const char pre_receive_hook[] = "hooks/pre-receive";
static const char post_receive_hook[] = "hooks/post-receive";

static int run_receive_hook(const char *hook_name)
{
static char buf[sizeof(commands->old_sha1) * 2 + PATH_MAX + 4];
struct command *cmd;
struct child_process proc;
const char *argv[2];
int have_input = 0, code;

for (cmd = commands; !have_input && cmd; cmd = cmd->next) {
if (!cmd->error_string)
have_input = 1;
}

if (!have_input || access(hook_name, X_OK) < 0)
return 0;

argv[0] = hook_name;
argv[1] = NULL;

memset(&proc, 0, sizeof(proc));
proc.argv = argv;
proc.in = -1;
proc.stdout_to_stderr = 1;

code = start_command(&proc);
if (code)
return code;
for (cmd = commands; cmd; cmd = cmd->next) {
if (!cmd->error_string) {
size_t n = snprintf(buf, sizeof(buf), "%s %s %s\n",
sha1_to_hex(cmd->old_sha1),
sha1_to_hex(cmd->new_sha1),
cmd->ref_name);
if (write_in_full(proc.in, buf, n) != n)
break;
}
}
close(proc.in);
return finish_command(&proc);
}

static int run_update_hook(struct command *cmd)
{
static const char update_hook[] = "hooks/update";
const char *argv[5];

if (access(update_hook, X_OK) < 0)
return 0;

argv[0] = update_hook;
argv[1] = cmd->ref_name;
argv[2] = sha1_to_hex(cmd->old_sha1);
argv[3] = sha1_to_hex(cmd->new_sha1);
argv[4] = NULL;

return run_command_v_opt(argv, RUN_COMMAND_NO_STDIN |
RUN_COMMAND_STDOUT_TO_STDERR);
}

static int is_ref_checked_out(const char *ref)
{
if (is_bare_repository())
return 0;

if (!head_name)
return 0;
return !strcmp(head_name, ref);
}

static char *warn_unconfigured_deny_msg[] = {
"Updating the currently checked out branch may cause confusion,",
"as the index and work tree do not reflect changes that are in HEAD.",
"As a result, you may see the changes you just pushed into it",
"reverted when you run 'git diff' over there, and you may want",
"to run 'git reset --hard' before starting to work to recover.",
"",
"You can set 'receive.denyCurrentBranch' configuration variable to",
"'refuse' in the remote repository to forbid pushing into its",
"current branch."
"",
"To allow pushing into the current branch, you can set it to 'ignore';",
"but this is not recommended unless you arranged to update its work",
"tree to match what you pushed in some other way.",
"",
"To squelch this message, you can set it to 'warn'.",
"",
"Note that the default will change in a future version of git",
"to refuse updating the current branch unless you have the",
"configuration variable set to either 'ignore' or 'warn'."
};

static void warn_unconfigured_deny(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(warn_unconfigured_deny_msg); i++)
warning("%s", warn_unconfigured_deny_msg[i]);
}

static char *warn_unconfigured_deny_delete_current_msg[] = {
"Deleting the current branch can cause confusion by making the next",
"'git clone' not check out any file.",
"",
"You can set 'receive.denyDeleteCurrent' configuration variable to",
"'refuse' in the remote repository to disallow deleting the current",
"branch.",
"",
"You can set it to 'ignore' to allow such a delete without a warning.",
"",
"To make this warning message less loud, you can set it to 'warn'.",
"",
"Note that the default will change in a future version of git",
"to refuse deleting the current branch unless you have the",
"configuration variable set to either 'ignore' or 'warn'."
};

static void warn_unconfigured_deny_delete_current(void)
{
int i;
for (i = 0;
i < ARRAY_SIZE(warn_unconfigured_deny_delete_current_msg);
i++)
warning("%s", warn_unconfigured_deny_delete_current_msg[i]);
}

static const char *update(struct command *cmd)
{
const char *name = cmd->ref_name;
unsigned char *old_sha1 = cmd->old_sha1;
unsigned char *new_sha1 = cmd->new_sha1;
struct ref_lock *lock;

/* only refs/... are allowed */
if (prefixcmp(name, "refs/") || check_ref_format(name + 5)) {
error("refusing to create funny ref '%s' remotely", name);
return "funny refname";
}

if (is_ref_checked_out(name)) {
switch (deny_current_branch) {
case DENY_IGNORE:
break;
case DENY_UNCONFIGURED:
case DENY_WARN:
warning("updating the current branch");
if (deny_current_branch == DENY_UNCONFIGURED)
warn_unconfigured_deny();
break;
case DENY_REFUSE:
error("refusing to update checked out branch: %s", name);
return "branch is currently checked out";
}
}

if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
error("unpack should have generated %s, "
"but I can't find it!", sha1_to_hex(new_sha1));
return "bad pack";
}

if (!is_null_sha1(old_sha1) && is_null_sha1(new_sha1)) {
if (deny_deletes && !prefixcmp(name, "refs/heads/")) {
error("denying ref deletion for %s", name);
return "deletion prohibited";
}

if (!strcmp(name, head_name)) {
switch (deny_delete_current) {
case DENY_IGNORE:
break;
case DENY_WARN:
case DENY_UNCONFIGURED:
if (deny_delete_current == DENY_UNCONFIGURED)
warn_unconfigured_deny_delete_current();
warning("deleting the current branch");
break;
case DENY_REFUSE:
error("refusing to delete the current branch: %s", name);
return "deletion of the current branch prohibited";
}
}
}

if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
!is_null_sha1(old_sha1) &&
!prefixcmp(name, "refs/heads/")) {
struct object *old_object, *new_object;
struct commit *old_commit, *new_commit;
struct commit_list *bases, *ent;

old_object = parse_object(old_sha1);
new_object = parse_object(new_sha1);

if (!old_object || !new_object ||
old_object->type != OBJ_COMMIT ||
new_object->type != OBJ_COMMIT) {
error("bad sha1 objects for %s", name);
return "bad ref";
}
old_commit = (struct commit *)old_object;
new_commit = (struct commit *)new_object;
bases = get_merge_bases(old_commit, new_commit, 1);
for (ent = bases; ent; ent = ent->next)
if (!hashcmp(old_sha1, ent->item->object.sha1))
break;
free_commit_list(bases);
if (!ent) {
error("denying non-fast-forward %s"
" (you should pull first)", name);
return "non-fast-forward";
}
}
if (run_update_hook(cmd)) {
error("hook declined to update %s", name);
return "hook declined";
}

if (is_null_sha1(new_sha1)) {
if (!parse_object(old_sha1)) {
warning ("Allowing deletion of corrupt ref.");
old_sha1 = NULL;
}
if (delete_ref(name, old_sha1, 0)) {
error("failed to delete %s", name);
return "failed to delete";
}
return NULL; /* good */
}
else {
lock = lock_any_ref_for_update(name, old_sha1, 0);
if (!lock) {
error("failed to lock %s", name);
return "failed to lock";
}
if (write_ref_sha1(lock, new_sha1, "push")) {
return "failed to write"; /* error() already called */
}
return NULL; /* good */
}
}

static char update_post_hook[] = "hooks/post-update";

static void run_update_post_hook(struct command *cmd)
{
struct command *cmd_p;
int argc, status;
const char **argv;

for (argc = 0, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
if (cmd_p->error_string)
continue;
argc++;
}
if (!argc || access(update_post_hook, X_OK) < 0)
return;
argv = xmalloc(sizeof(*argv) * (2 + argc));
argv[0] = update_post_hook;

for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
char *p;
if (cmd_p->error_string)
continue;
p = xmalloc(strlen(cmd_p->ref_name) + 1);
strcpy(p, cmd_p->ref_name);
argv[argc] = p;
argc++;
}
argv[argc] = NULL;
status = run_command_v_opt(argv, RUN_COMMAND_NO_STDIN
| RUN_COMMAND_STDOUT_TO_STDERR);
}

static void execute_commands(const char *unpacker_error)
{
struct command *cmd = commands;
unsigned char sha1[20];

if (unpacker_error) {
while (cmd) {
cmd->error_string = "n/a (unpacker error)";
cmd = cmd->next;
}
return;
}

if (run_receive_hook(pre_receive_hook)) {
while (cmd) {
cmd->error_string = "pre-receive hook declined";
cmd = cmd->next;
}
return;
}

head_name = resolve_ref("HEAD", sha1, 0, NULL);

while (cmd) {
cmd->error_string = update(cmd);
cmd = cmd->next;
}
}

static void read_head_info(void)
{
struct command **p = &commands;
for (;;) {
static char line[1000];
unsigned char old_sha1[20], new_sha1[20];
struct command *cmd;
char *refname;
int len, reflen;

len = packet_read_line(0, line, sizeof(line));
if (!len)
break;
if (line[len-1] == '\n')
line[--len] = 0;
if (len < 83 ||
line[40] != ' ' ||
line[81] != ' ' ||
get_sha1_hex(line, old_sha1) ||
get_sha1_hex(line + 41, new_sha1))
die("protocol error: expected old/new/ref, got '%s'",
line);

refname = line + 82;
reflen = strlen(refname);
if (reflen + 82 < len) {
if (strstr(refname + reflen + 1, "report-status"))
report_status = 1;
}
cmd = xmalloc(sizeof(struct command) + len - 80);
hashcpy(cmd->old_sha1, old_sha1);
hashcpy(cmd->new_sha1, new_sha1);
memcpy(cmd->ref_name, line + 82, len - 81);
cmd->error_string = NULL;
cmd->next = NULL;
*p = cmd;
p = &cmd->next;
}
}

static const char *parse_pack_header(struct pack_header *hdr)
{
switch (read_pack_header(0, hdr)) {
case PH_ERROR_EOF:
return "eof before pack header was fully read";

case PH_ERROR_PACK_SIGNATURE:
return "protocol error (pack signature mismatch detected)";

case PH_ERROR_PROTOCOL:
return "protocol error (pack version unsupported)";

default:
return "unknown error in parse_pack_header";

case 0:
return NULL;
}
}

static const char *pack_lockfile;

static const char *unpack(void)
{
struct pack_header hdr;
const char *hdr_err;
char hdr_arg[38];

hdr_err = parse_pack_header(&hdr);
if (hdr_err)
return hdr_err;
snprintf(hdr_arg, sizeof(hdr_arg),
"--pack_header=%"PRIu32",%"PRIu32,
ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));

if (ntohl(hdr.hdr_entries) < unpack_limit) {
int code, i = 0;
const char *unpacker[4];
unpacker[i++] = "unpack-objects";
if (receive_fsck_objects)
unpacker[i++] = "--strict";
unpacker[i++] = hdr_arg;
unpacker[i++] = NULL;
code = run_command_v_opt(unpacker, RUN_GIT_CMD);
if (!code)
return NULL;
return "unpack-objects abnormal exit";
} else {
const char *keeper[7];
int s, status, i = 0;
char keep_arg[256];
struct child_process ip;

s = sprintf(keep_arg, "--keep=receive-pack %"PRIuMAX" on ", (uintmax_t) getpid());
if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
strcpy(keep_arg + s, "localhost");

keeper[i++] = "index-pack";
keeper[i++] = "--stdin";
if (receive_fsck_objects)
keeper[i++] = "--strict";
keeper[i++] = "--fix-thin";
keeper[i++] = hdr_arg;
keeper[i++] = keep_arg;
keeper[i++] = NULL;
memset(&ip, 0, sizeof(ip));
ip.argv = keeper;
ip.out = -1;
ip.git_cmd = 1;
status = start_command(&ip);
if (status) {
return "index-pack fork failed";
}
pack_lockfile = index_pack_lockfile(ip.out);
close(ip.out);
status = finish_command(&ip);
if (!status) {
reprepare_packed_git();
return NULL;
}
return "index-pack abnormal exit";
}
}

static void report(const char *unpack_status)
{
struct command *cmd;
packet_write(1, "unpack %s\n",
unpack_status ? unpack_status : "ok");
for (cmd = commands; cmd; cmd = cmd->next) {
if (!cmd->error_string)
packet_write(1, "ok %s\n",
cmd->ref_name);
else
packet_write(1, "ng %s %s\n",
cmd->ref_name, cmd->error_string);
}
packet_flush(1);
}

static int delete_only(struct command *cmd)
{
while (cmd) {
if (!is_null_sha1(cmd->new_sha1))
return 0;
cmd = cmd->next;
}
return 1;
}

static int add_refs_from_alternate(struct alternate_object_database *e, void *unused)
{
char *other;
size_t len;
struct remote *remote;
struct transport *transport;
const struct ref *extra;

e->name[-1] = '\0';
other = xstrdup(make_absolute_path(e->base));
e->name[-1] = '/';
len = strlen(other);

while (other[len-1] == '/')
other[--len] = '\0';
if (len < 8 || memcmp(other + len - 8, "/objects", 8))
return 0;
/* Is this a git repository with refs? */
memcpy(other + len - 8, "/refs", 6);
if (!is_directory(other))
return 0;
other[len - 8] = '\0';
remote = remote_get(other);
transport = transport_get(remote, other);
for (extra = transport_get_remote_refs(transport);
extra;
extra = extra->next) {
add_extra_ref(".have", extra->old_sha1, 0);
}
transport_disconnect(transport);
free(other);
return 0;
}

static void add_alternate_refs(void)
{
foreach_alt_odb(add_refs_from_alternate, NULL);
}

int cmd_receive_pack(int argc, const char **argv, const char *prefix)
{
int advertise_refs = 0;
int stateless_rpc = 0;
int i;
char *dir = NULL;

argv++;
for (i = 1; i < argc; i++) {
const char *arg = *argv++;

if (*arg == '-') {
if (!strcmp(arg, "--advertise-refs")) {
advertise_refs = 1;
continue;
}
if (!strcmp(arg, "--stateless-rpc")) {
stateless_rpc = 1;
continue;
}

usage(receive_pack_usage);
}
if (dir)
usage(receive_pack_usage);
dir = xstrdup(arg);
}
if (!dir)
usage(receive_pack_usage);

setup_path();

if (!enter_repo(dir, 0))
die("'%s' does not appear to be a git repository", dir);

if (is_repository_shallow())
die("attempt to push into a shallow repository");

git_config(receive_pack_config, NULL);

if (0 <= transfer_unpack_limit)
unpack_limit = transfer_unpack_limit;
else if (0 <= receive_unpack_limit)
unpack_limit = receive_unpack_limit;

capabilities_to_send = (prefer_ofs_delta) ?
" report-status delete-refs ofs-delta " :
" report-status delete-refs ";

if (advertise_refs || !stateless_rpc) {
add_alternate_refs();
write_head_info();
clear_extra_refs();

/* EOF */
packet_flush(1);
}
if (advertise_refs)
return 0;

read_head_info();
if (commands) {
const char *unpack_status = NULL;

if (!delete_only(commands))
unpack_status = unpack();
execute_commands(unpack_status);
if (pack_lockfile)
unlink_or_warn(pack_lockfile);
if (report_status)
report(unpack_status);
run_receive_hook(post_receive_hook);
run_update_post_hook(commands);
if (auto_gc) {
const char *argv_gc_auto[] = {
"gc", "--auto", "--quiet", NULL,
};
run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
}
if (auto_update_server_info)
update_server_info(0);
}
return 0;
}
Something went wrong with that request. Please try again.