1#include"cache.h" 2#include"config.h" 3#include"dir.h" 4#include"string-list.h" 5 6static int inside_git_dir = -1; 7static int inside_work_tree = -1; 8static int work_tree_config_is_bogus; 9 10static struct startup_info the_startup_info; 11struct startup_info *startup_info = &the_startup_info; 12 13/* 14 * The input parameter must contain an absolute path, and it must already be 15 * normalized. 16 * 17 * Find the part of an absolute path that lies inside the work tree by 18 * dereferencing symlinks outside the work tree, for example: 19 * /dir1/repo/dir2/file (work tree is /dir1/repo) -> dir2/file 20 * /dir/file (work tree is /) -> dir/file 21 * /dir/symlink1/symlink2 (symlink1 points to work tree) -> symlink2 22 * /dir/repolink/file (repolink points to /dir/repo) -> file 23 * /dir/repo (exactly equal to work tree) -> (empty string) 24 */ 25static intabspath_part_inside_repo(char*path) 26{ 27size_t len; 28size_t wtlen; 29char*path0; 30int off; 31const char*work_tree =get_git_work_tree(); 32 33if(!work_tree) 34return-1; 35 wtlen =strlen(work_tree); 36 len =strlen(path); 37 off =offset_1st_component(path); 38 39/* check if work tree is already the prefix */ 40if(wtlen <= len && !strncmp(path, work_tree, wtlen)) { 41if(path[wtlen] =='/') { 42memmove(path, path + wtlen +1, len - wtlen); 43return0; 44}else if(path[wtlen -1] =='/'|| path[wtlen] =='\0') { 45/* work tree is the root, or the whole path */ 46memmove(path, path + wtlen, len - wtlen +1); 47return0; 48} 49/* work tree might match beginning of a symlink to work tree */ 50 off = wtlen; 51} 52 path0 = path; 53 path += off; 54 55/* check each '/'-terminated level */ 56while(*path) { 57 path++; 58if(*path =='/') { 59*path ='\0'; 60if(strcmp(real_path(path0), work_tree) ==0) { 61memmove(path0, path +1, len - (path - path0)); 62return0; 63} 64*path ='/'; 65} 66} 67 68/* check whole path */ 69if(strcmp(real_path(path0), work_tree) ==0) { 70*path0 ='\0'; 71return0; 72} 73 74return-1; 75} 76 77/* 78 * Normalize "path", prepending the "prefix" for relative paths. If 79 * remaining_prefix is not NULL, return the actual prefix still 80 * remains in the path. For example, prefix = sub1/sub2/ and path is 81 * 82 * foo -> sub1/sub2/foo (full prefix) 83 * ../foo -> sub1/foo (remaining prefix is sub1/) 84 * ../../bar -> bar (no remaining prefix) 85 * ../../sub1/sub2/foo -> sub1/sub2/foo (but no remaining prefix) 86 * `pwd`/../bar -> sub1/bar (no remaining prefix) 87 */ 88char*prefix_path_gently(const char*prefix,int len, 89int*remaining_prefix,const char*path) 90{ 91const char*orig = path; 92char*sanitized; 93if(is_absolute_path(orig)) { 94 sanitized =xmallocz(strlen(path)); 95if(remaining_prefix) 96*remaining_prefix =0; 97if(normalize_path_copy_len(sanitized, path, remaining_prefix)) { 98free(sanitized); 99return NULL; 100} 101if(abspath_part_inside_repo(sanitized)) { 102free(sanitized); 103return NULL; 104} 105}else{ 106 sanitized =xstrfmt("%.*s%s", len, len ? prefix :"", path); 107if(remaining_prefix) 108*remaining_prefix = len; 109if(normalize_path_copy_len(sanitized, sanitized, remaining_prefix)) { 110free(sanitized); 111return NULL; 112} 113} 114return sanitized; 115} 116 117char*prefix_path(const char*prefix,int len,const char*path) 118{ 119char*r =prefix_path_gently(prefix, len, NULL, path); 120if(!r) 121die("'%s' is outside repository", path); 122return r; 123} 124 125intpath_inside_repo(const char*prefix,const char*path) 126{ 127int len = prefix ?strlen(prefix) :0; 128char*r =prefix_path_gently(prefix, len, NULL, path); 129if(r) { 130free(r); 131return1; 132} 133return0; 134} 135 136intcheck_filename(const char*prefix,const char*arg) 137{ 138char*to_free = NULL; 139struct stat st; 140 141if(skip_prefix(arg,":/", &arg)) { 142if(!*arg)/* ":/" is root dir, always exists */ 143return1; 144 prefix = NULL; 145}else if(skip_prefix(arg,":!", &arg) || 146skip_prefix(arg,":^", &arg)) { 147if(!*arg)/* excluding everything is silly, but allowed */ 148return1; 149} 150 151if(prefix) 152 arg = to_free =prefix_filename(prefix, arg); 153 154if(!lstat(arg, &st)) { 155free(to_free); 156return1;/* file exists */ 157} 158if(is_missing_file_error(errno)) { 159free(to_free); 160return0;/* file does not exist */ 161} 162die_errno("failed to stat '%s'", arg); 163} 164 165static void NORETURN die_verify_filename(const char*prefix, 166const char*arg, 167int diagnose_misspelt_rev) 168{ 169if(!diagnose_misspelt_rev) 170die(_("%s: no such path in the working tree.\n" 171"Use 'git <command> -- <path>...' to specify paths that do not exist locally."), 172 arg); 173/* 174 * Saying "'(icase)foo' does not exist in the index" when the 175 * user gave us ":(icase)foo" is just stupid. A magic pathspec 176 * begins with a colon and is followed by a non-alnum; do not 177 * let maybe_die_on_misspelt_object_name() even trigger. 178 */ 179if(!(arg[0] ==':'&& !isalnum(arg[1]))) 180maybe_die_on_misspelt_object_name(arg, prefix); 181 182/* ... or fall back the most general message. */ 183die(_("ambiguous argument '%s': unknown revision or path not in the working tree.\n" 184"Use '--' to separate paths from revisions, like this:\n" 185"'git <command> [<revision>...] -- [<file>...]'"), arg); 186 187} 188 189/* 190 * Check for arguments that don't resolve as actual files, 191 * but which look sufficiently like pathspecs that we'll consider 192 * them such for the purposes of rev/pathspec DWIM parsing. 193 */ 194static intlooks_like_pathspec(const char*arg) 195{ 196/* anything with a wildcard character */ 197if(!no_wildcard(arg)) 198return1; 199 200/* long-form pathspec magic */ 201if(starts_with(arg,":(")) 202return1; 203 204return0; 205} 206 207/* 208 * Verify a filename that we got as an argument for a pathspec 209 * entry. Note that a filename that begins with "-" never verifies 210 * as true, because even if such a filename were to exist, we want 211 * it to be preceded by the "--" marker (or we want the user to 212 * use a format like "./-filename") 213 * 214 * The "diagnose_misspelt_rev" is used to provide a user-friendly 215 * diagnosis when dying upon finding that "name" is not a pathname. 216 * If set to 1, the diagnosis will try to diagnose "name" as an 217 * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis 218 * will only complain about an inexisting file. 219 * 220 * This function is typically called to check that a "file or rev" 221 * argument is unambiguous. In this case, the caller will want 222 * diagnose_misspelt_rev == 1 when verifying the first non-rev 223 * argument (which could have been a revision), and 224 * diagnose_misspelt_rev == 0 for the next ones (because we already 225 * saw a filename, there's not ambiguity anymore). 226 */ 227voidverify_filename(const char*prefix, 228const char*arg, 229int diagnose_misspelt_rev) 230{ 231if(*arg =='-') 232die("bad flag '%s' used after filename", arg); 233if(looks_like_pathspec(arg) ||check_filename(prefix, arg)) 234return; 235die_verify_filename(prefix, arg, diagnose_misspelt_rev); 236} 237 238/* 239 * Opposite of the above: the command line did not have -- marker 240 * and we parsed the arg as a refname. It should not be interpretable 241 * as a filename. 242 */ 243voidverify_non_filename(const char*prefix,const char*arg) 244{ 245if(!is_inside_work_tree() ||is_inside_git_dir()) 246return; 247if(*arg =='-') 248return;/* flag */ 249if(!check_filename(prefix, arg)) 250return; 251die(_("ambiguous argument '%s': both revision and filename\n" 252"Use '--' to separate paths from revisions, like this:\n" 253"'git <command> [<revision>...] -- [<file>...]'"), arg); 254} 255 256intget_common_dir(struct strbuf *sb,const char*gitdir) 257{ 258const char*git_env_common_dir =getenv(GIT_COMMON_DIR_ENVIRONMENT); 259if(git_env_common_dir) { 260strbuf_addstr(sb, git_env_common_dir); 261return1; 262}else{ 263returnget_common_dir_noenv(sb, gitdir); 264} 265} 266 267intget_common_dir_noenv(struct strbuf *sb,const char*gitdir) 268{ 269struct strbuf data = STRBUF_INIT; 270struct strbuf path = STRBUF_INIT; 271int ret =0; 272 273strbuf_addf(&path,"%s/commondir", gitdir); 274if(file_exists(path.buf)) { 275if(strbuf_read_file(&data, path.buf,0) <=0) 276die_errno(_("failed to read%s"), path.buf); 277while(data.len && (data.buf[data.len -1] =='\n'|| 278 data.buf[data.len -1] =='\r')) 279 data.len--; 280 data.buf[data.len] ='\0'; 281strbuf_reset(&path); 282if(!is_absolute_path(data.buf)) 283strbuf_addf(&path,"%s/", gitdir); 284strbuf_addbuf(&path, &data); 285strbuf_add_real_path(sb, path.buf); 286 ret =1; 287}else{ 288strbuf_addstr(sb, gitdir); 289} 290 291strbuf_release(&data); 292strbuf_release(&path); 293return ret; 294} 295 296/* 297 * Test if it looks like we're at a git directory. 298 * We want to see: 299 * 300 * - either an objects/ directory _or_ the proper 301 * GIT_OBJECT_DIRECTORY environment variable 302 * - a refs/ directory 303 * - either a HEAD symlink or a HEAD file that is formatted as 304 * a proper "ref:", or a regular file HEAD that has a properly 305 * formatted sha1 object name. 306 */ 307intis_git_directory(const char*suspect) 308{ 309struct strbuf path = STRBUF_INIT; 310int ret =0; 311size_t len; 312 313/* Check worktree-related signatures */ 314strbuf_addf(&path,"%s/HEAD", suspect); 315if(validate_headref(path.buf)) 316goto done; 317 318strbuf_reset(&path); 319get_common_dir(&path, suspect); 320 len = path.len; 321 322/* Check non-worktree-related signatures */ 323if(getenv(DB_ENVIRONMENT)) { 324if(access(getenv(DB_ENVIRONMENT), X_OK)) 325goto done; 326} 327else{ 328strbuf_setlen(&path, len); 329strbuf_addstr(&path,"/objects"); 330if(access(path.buf, X_OK)) 331goto done; 332} 333 334strbuf_setlen(&path, len); 335strbuf_addstr(&path,"/refs"); 336if(access(path.buf, X_OK)) 337goto done; 338 339 ret =1; 340done: 341strbuf_release(&path); 342return ret; 343} 344 345intis_nonbare_repository_dir(struct strbuf *path) 346{ 347int ret =0; 348int gitfile_error; 349size_t orig_path_len = path->len; 350assert(orig_path_len !=0); 351strbuf_complete(path,'/'); 352strbuf_addstr(path,".git"); 353if(read_gitfile_gently(path->buf, &gitfile_error) ||is_git_directory(path->buf)) 354 ret =1; 355if(gitfile_error == READ_GITFILE_ERR_OPEN_FAILED || 356 gitfile_error == READ_GITFILE_ERR_READ_FAILED) 357 ret =1; 358strbuf_setlen(path, orig_path_len); 359return ret; 360} 361 362intis_inside_git_dir(void) 363{ 364if(inside_git_dir <0) 365 inside_git_dir =is_inside_dir(get_git_dir()); 366return inside_git_dir; 367} 368 369intis_inside_work_tree(void) 370{ 371if(inside_work_tree <0) 372 inside_work_tree =is_inside_dir(get_git_work_tree()); 373return inside_work_tree; 374} 375 376voidsetup_work_tree(void) 377{ 378const char*work_tree, *git_dir; 379static int initialized =0; 380 381if(initialized) 382return; 383 384if(work_tree_config_is_bogus) 385die("unable to set up work tree using invalid config"); 386 387 work_tree =get_git_work_tree(); 388 git_dir =get_git_dir(); 389if(!is_absolute_path(git_dir)) 390 git_dir =real_path(get_git_dir()); 391if(!work_tree ||chdir(work_tree)) 392die("This operation must be run in a work tree"); 393 394/* 395 * Make sure subsequent git processes find correct worktree 396 * if $GIT_WORK_TREE is set relative 397 */ 398if(getenv(GIT_WORK_TREE_ENVIRONMENT)) 399setenv(GIT_WORK_TREE_ENVIRONMENT,".",1); 400 401set_git_dir(remove_leading_path(git_dir, work_tree)); 402 initialized =1; 403} 404 405static intcheck_repo_format(const char*var,const char*value,void*vdata) 406{ 407struct repository_format *data = vdata; 408const char*ext; 409 410if(strcmp(var,"core.repositoryformatversion") ==0) 411 data->version =git_config_int(var, value); 412else if(skip_prefix(var,"extensions.", &ext)) { 413/* 414 * record any known extensions here; otherwise, 415 * we fall through to recording it as unknown, and 416 * check_repository_format will complain 417 */ 418if(!strcmp(ext,"noop")) 419; 420else if(!strcmp(ext,"preciousobjects")) 421 data->precious_objects =git_config_bool(var, value); 422else 423string_list_append(&data->unknown_extensions, ext); 424}else if(strcmp(var,"core.bare") ==0) { 425 data->is_bare =git_config_bool(var, value); 426}else if(strcmp(var,"core.worktree") ==0) { 427if(!value) 428returnconfig_error_nonbool(var); 429 data->work_tree =xstrdup(value); 430} 431return0; 432} 433 434static intcheck_repository_format_gently(const char*gitdir,int*nongit_ok) 435{ 436struct strbuf sb = STRBUF_INIT; 437struct strbuf err = STRBUF_INIT; 438struct repository_format candidate; 439int has_common; 440 441 has_common =get_common_dir(&sb, gitdir); 442strbuf_addstr(&sb,"/config"); 443read_repository_format(&candidate, sb.buf); 444strbuf_release(&sb); 445 446/* 447 * For historical use of check_repository_format() in git-init, 448 * we treat a missing config as a silent "ok", even when nongit_ok 449 * is unset. 450 */ 451if(candidate.version <0) 452return0; 453 454if(verify_repository_format(&candidate, &err) <0) { 455if(nongit_ok) { 456warning("%s", err.buf); 457strbuf_release(&err); 458*nongit_ok = -1; 459return-1; 460} 461die("%s", err.buf); 462} 463 464 repository_format_precious_objects = candidate.precious_objects; 465string_list_clear(&candidate.unknown_extensions,0); 466if(!has_common) { 467if(candidate.is_bare != -1) { 468 is_bare_repository_cfg = candidate.is_bare; 469if(is_bare_repository_cfg ==1) 470 inside_work_tree = -1; 471} 472if(candidate.work_tree) { 473free(git_work_tree_cfg); 474 git_work_tree_cfg = candidate.work_tree; 475 inside_work_tree = -1; 476} 477}else{ 478free(candidate.work_tree); 479} 480 481return0; 482} 483 484intread_repository_format(struct repository_format *format,const char*path) 485{ 486memset(format,0,sizeof(*format)); 487 format->version = -1; 488 format->is_bare = -1; 489string_list_init(&format->unknown_extensions,1); 490git_config_from_file(check_repo_format, path, format); 491return format->version; 492} 493 494intverify_repository_format(const struct repository_format *format, 495struct strbuf *err) 496{ 497if(GIT_REPO_VERSION_READ < format->version) { 498strbuf_addf(err,_("Expected git repo version <=%d, found%d"), 499 GIT_REPO_VERSION_READ, format->version); 500return-1; 501} 502 503if(format->version >=1&& format->unknown_extensions.nr) { 504int i; 505 506strbuf_addstr(err,_("unknown repository extensions found:")); 507 508for(i =0; i < format->unknown_extensions.nr; i++) 509strbuf_addf(err,"\n\t%s", 510 format->unknown_extensions.items[i].string); 511return-1; 512} 513 514return0; 515} 516 517voidread_gitfile_error_die(int error_code,const char*path,const char*dir) 518{ 519switch(error_code) { 520case READ_GITFILE_ERR_STAT_FAILED: 521case READ_GITFILE_ERR_NOT_A_FILE: 522/* non-fatal; follow return path */ 523break; 524case READ_GITFILE_ERR_OPEN_FAILED: 525die_errno("Error opening '%s'", path); 526case READ_GITFILE_ERR_TOO_LARGE: 527die("Too large to be a .git file: '%s'", path); 528case READ_GITFILE_ERR_READ_FAILED: 529die("Error reading%s", path); 530case READ_GITFILE_ERR_INVALID_FORMAT: 531die("Invalid gitfile format:%s", path); 532case READ_GITFILE_ERR_NO_PATH: 533die("No path in gitfile:%s", path); 534case READ_GITFILE_ERR_NOT_A_REPO: 535die("Not a git repository:%s", dir); 536default: 537die("BUG: unknown error code"); 538} 539} 540 541/* 542 * Try to read the location of the git directory from the .git file, 543 * return path to git directory if found. 544 * 545 * On failure, if return_error_code is not NULL, return_error_code 546 * will be set to an error code and NULL will be returned. If 547 * return_error_code is NULL the function will die instead (for most 548 * cases). 549 */ 550const char*read_gitfile_gently(const char*path,int*return_error_code) 551{ 552const int max_file_size =1<<20;/* 1MB */ 553int error_code =0; 554char*buf = NULL; 555char*dir = NULL; 556const char*slash; 557struct stat st; 558int fd; 559 ssize_t len; 560 561if(stat(path, &st)) { 562/* NEEDSWORK: discern between ENOENT vs other errors */ 563 error_code = READ_GITFILE_ERR_STAT_FAILED; 564goto cleanup_return; 565} 566if(!S_ISREG(st.st_mode)) { 567 error_code = READ_GITFILE_ERR_NOT_A_FILE; 568goto cleanup_return; 569} 570if(st.st_size > max_file_size) { 571 error_code = READ_GITFILE_ERR_TOO_LARGE; 572goto cleanup_return; 573} 574 fd =open(path, O_RDONLY); 575if(fd <0) { 576 error_code = READ_GITFILE_ERR_OPEN_FAILED; 577goto cleanup_return; 578} 579 buf =xmallocz(st.st_size); 580 len =read_in_full(fd, buf, st.st_size); 581close(fd); 582if(len != st.st_size) { 583 error_code = READ_GITFILE_ERR_READ_FAILED; 584goto cleanup_return; 585} 586if(!starts_with(buf,"gitdir: ")) { 587 error_code = READ_GITFILE_ERR_INVALID_FORMAT; 588goto cleanup_return; 589} 590while(buf[len -1] =='\n'|| buf[len -1] =='\r') 591 len--; 592if(len <9) { 593 error_code = READ_GITFILE_ERR_NO_PATH; 594goto cleanup_return; 595} 596 buf[len] ='\0'; 597 dir = buf +8; 598 599if(!is_absolute_path(dir) && (slash =strrchr(path,'/'))) { 600size_t pathlen = slash+1- path; 601 dir =xstrfmt("%.*s%.*s", (int)pathlen, path, 602(int)(len -8), buf +8); 603free(buf); 604 buf = dir; 605} 606if(!is_git_directory(dir)) { 607 error_code = READ_GITFILE_ERR_NOT_A_REPO; 608goto cleanup_return; 609} 610 path =real_path(dir); 611 612cleanup_return: 613if(return_error_code) 614*return_error_code = error_code; 615else if(error_code) 616read_gitfile_error_die(error_code, path, dir); 617 618free(buf); 619return error_code ? NULL : path; 620} 621 622static const char*setup_explicit_git_dir(const char*gitdirenv, 623struct strbuf *cwd, 624int*nongit_ok) 625{ 626const char*work_tree_env =getenv(GIT_WORK_TREE_ENVIRONMENT); 627const char*worktree; 628char*gitfile; 629int offset; 630 631if(PATH_MAX -40<strlen(gitdirenv)) 632die("'$%s' too big", GIT_DIR_ENVIRONMENT); 633 634 gitfile = (char*)read_gitfile(gitdirenv); 635if(gitfile) { 636 gitfile =xstrdup(gitfile); 637 gitdirenv = gitfile; 638} 639 640if(!is_git_directory(gitdirenv)) { 641if(nongit_ok) { 642*nongit_ok =1; 643free(gitfile); 644return NULL; 645} 646die("Not a git repository: '%s'", gitdirenv); 647} 648 649if(check_repository_format_gently(gitdirenv, nongit_ok)) { 650free(gitfile); 651return NULL; 652} 653 654/* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */ 655if(work_tree_env) 656set_git_work_tree(work_tree_env); 657else if(is_bare_repository_cfg >0) { 658if(git_work_tree_cfg) { 659/* #22.2, #30 */ 660warning("core.bare and core.worktree do not make sense"); 661 work_tree_config_is_bogus =1; 662} 663 664/* #18, #26 */ 665set_git_dir(gitdirenv); 666free(gitfile); 667return NULL; 668} 669else if(git_work_tree_cfg) {/* #6, #14 */ 670if(is_absolute_path(git_work_tree_cfg)) 671set_git_work_tree(git_work_tree_cfg); 672else{ 673char*core_worktree; 674if(chdir(gitdirenv)) 675die_errno("Could not chdir to '%s'", gitdirenv); 676if(chdir(git_work_tree_cfg)) 677die_errno("Could not chdir to '%s'", git_work_tree_cfg); 678 core_worktree =xgetcwd(); 679if(chdir(cwd->buf)) 680die_errno("Could not come back to cwd"); 681set_git_work_tree(core_worktree); 682free(core_worktree); 683} 684} 685else if(!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT,1)) { 686/* #16d */ 687set_git_dir(gitdirenv); 688free(gitfile); 689return NULL; 690} 691else/* #2, #10 */ 692set_git_work_tree("."); 693 694/* set_git_work_tree() must have been called by now */ 695 worktree =get_git_work_tree(); 696 697/* both get_git_work_tree() and cwd are already normalized */ 698if(!strcmp(cwd->buf, worktree)) {/* cwd == worktree */ 699set_git_dir(gitdirenv); 700free(gitfile); 701return NULL; 702} 703 704 offset =dir_inside_of(cwd->buf, worktree); 705if(offset >=0) {/* cwd inside worktree? */ 706set_git_dir(real_path(gitdirenv)); 707if(chdir(worktree)) 708die_errno("Could not chdir to '%s'", worktree); 709strbuf_addch(cwd,'/'); 710free(gitfile); 711return cwd->buf + offset; 712} 713 714/* cwd outside worktree */ 715set_git_dir(gitdirenv); 716free(gitfile); 717return NULL; 718} 719 720static const char*setup_discovered_git_dir(const char*gitdir, 721struct strbuf *cwd,int offset, 722int*nongit_ok) 723{ 724if(check_repository_format_gently(gitdir, nongit_ok)) 725return NULL; 726 727/* --work-tree is set without --git-dir; use discovered one */ 728if(getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) { 729char*to_free = NULL; 730const char*ret; 731 732if(offset != cwd->len && !is_absolute_path(gitdir)) 733 gitdir = to_free =real_pathdup(gitdir,1); 734if(chdir(cwd->buf)) 735die_errno("Could not come back to cwd"); 736 ret =setup_explicit_git_dir(gitdir, cwd, nongit_ok); 737free(to_free); 738return ret; 739} 740 741/* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */ 742if(is_bare_repository_cfg >0) { 743set_git_dir(offset == cwd->len ? gitdir :real_path(gitdir)); 744if(chdir(cwd->buf)) 745die_errno("Could not come back to cwd"); 746return NULL; 747} 748 749/* #0, #1, #5, #8, #9, #12, #13 */ 750set_git_work_tree("."); 751if(strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT)) 752set_git_dir(gitdir); 753 inside_git_dir =0; 754 inside_work_tree =1; 755if(offset == cwd->len) 756return NULL; 757 758/* Make "offset" point past the '/' (already the case for root dirs) */ 759if(offset !=offset_1st_component(cwd->buf)) 760 offset++; 761/* Add a '/' at the end */ 762strbuf_addch(cwd,'/'); 763return cwd->buf + offset; 764} 765 766/* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */ 767static const char*setup_bare_git_dir(struct strbuf *cwd,int offset, 768int*nongit_ok) 769{ 770int root_len; 771 772if(check_repository_format_gently(".", nongit_ok)) 773return NULL; 774 775setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT,"0",1); 776 777/* --work-tree is set without --git-dir; use discovered one */ 778if(getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) { 779static const char*gitdir; 780 781 gitdir = offset == cwd->len ?".":xmemdupz(cwd->buf, offset); 782if(chdir(cwd->buf)) 783die_errno("Could not come back to cwd"); 784returnsetup_explicit_git_dir(gitdir, cwd, nongit_ok); 785} 786 787 inside_git_dir =1; 788 inside_work_tree =0; 789if(offset != cwd->len) { 790if(chdir(cwd->buf)) 791die_errno("Cannot come back to cwd"); 792 root_len =offset_1st_component(cwd->buf); 793strbuf_setlen(cwd, offset > root_len ? offset : root_len); 794set_git_dir(cwd->buf); 795} 796else 797set_git_dir("."); 798return NULL; 799} 800 801static const char*setup_nongit(const char*cwd,int*nongit_ok) 802{ 803if(!nongit_ok) 804die(_("Not a git repository (or any of the parent directories):%s"), DEFAULT_GIT_DIR_ENVIRONMENT); 805if(chdir(cwd)) 806die_errno(_("Cannot come back to cwd")); 807*nongit_ok =1; 808return NULL; 809} 810 811static dev_t get_device_or_die(const char*path,const char*prefix,int prefix_len) 812{ 813struct stat buf; 814if(stat(path, &buf)) { 815die_errno("failed to stat '%*s%s%s'", 816 prefix_len, 817 prefix ? prefix :"", 818 prefix ?"/":"", path); 819} 820return buf.st_dev; 821} 822 823/* 824 * A "string_list_each_func_t" function that canonicalizes an entry 825 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or 826 * discards it if unusable. The presence of an empty entry in 827 * GIT_CEILING_DIRECTORIES turns off canonicalization for all 828 * subsequent entries. 829 */ 830static intcanonicalize_ceiling_entry(struct string_list_item *item, 831void*cb_data) 832{ 833int*empty_entry_found = cb_data; 834char*ceil = item->string; 835 836if(!*ceil) { 837*empty_entry_found =1; 838return0; 839}else if(!is_absolute_path(ceil)) { 840return0; 841}else if(*empty_entry_found) { 842/* Keep entry but do not canonicalize it */ 843return1; 844}else{ 845char*real_path =real_pathdup(ceil,0); 846if(!real_path) { 847return0; 848} 849free(item->string); 850 item->string = real_path; 851return1; 852} 853} 854 855enum discovery_result { 856 GIT_DIR_NONE =0, 857 GIT_DIR_EXPLICIT, 858 GIT_DIR_DISCOVERED, 859 GIT_DIR_BARE, 860/* these are errors */ 861 GIT_DIR_HIT_CEILING = -1, 862 GIT_DIR_HIT_MOUNT_POINT = -2, 863 GIT_DIR_INVALID_GITFILE = -3 864}; 865 866/* 867 * We cannot decide in this function whether we are in the work tree or 868 * not, since the config can only be read _after_ this function was called. 869 * 870 * Also, we avoid changing any global state (such as the current working 871 * directory) to allow early callers. 872 * 873 * The directory where the search should start needs to be passed in via the 874 * `dir` parameter; upon return, the `dir` buffer will contain the path of 875 * the directory where the search ended, and `gitdir` will contain the path of 876 * the discovered .git/ directory, if any. If `gitdir` is not absolute, it 877 * is relative to `dir` (i.e. *not* necessarily the cwd). 878 */ 879static enum discovery_result setup_git_directory_gently_1(struct strbuf *dir, 880struct strbuf *gitdir, 881int die_on_error) 882{ 883const char*env_ceiling_dirs =getenv(CEILING_DIRECTORIES_ENVIRONMENT); 884struct string_list ceiling_dirs = STRING_LIST_INIT_DUP; 885const char*gitdirenv; 886int ceil_offset = -1, min_offset =has_dos_drive_prefix(dir->buf) ?3:1; 887 dev_t current_device =0; 888int one_filesystem =1; 889 890/* 891 * If GIT_DIR is set explicitly, we're not going 892 * to do any discovery, but we still do repository 893 * validation. 894 */ 895 gitdirenv =getenv(GIT_DIR_ENVIRONMENT); 896if(gitdirenv) { 897strbuf_addstr(gitdir, gitdirenv); 898return GIT_DIR_EXPLICIT; 899} 900 901if(env_ceiling_dirs) { 902int empty_entry_found =0; 903 904string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1); 905filter_string_list(&ceiling_dirs,0, 906 canonicalize_ceiling_entry, &empty_entry_found); 907 ceil_offset =longest_ancestor_length(dir->buf, &ceiling_dirs); 908string_list_clear(&ceiling_dirs,0); 909} 910 911if(ceil_offset <0) 912 ceil_offset = min_offset -2; 913 914/* 915 * Test in the following order (relative to the dir): 916 * - .git (file containing "gitdir: <path>") 917 * - .git/ 918 * - ./ (bare) 919 * - ../.git 920 * - ../.git/ 921 * - ../ (bare) 922 * - ../../.git/ 923 * etc. 924 */ 925 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM",0); 926if(one_filesystem) 927 current_device =get_device_or_die(dir->buf, NULL,0); 928for(;;) { 929int offset = dir->len, error_code =0; 930 931if(offset > min_offset) 932strbuf_addch(dir,'/'); 933strbuf_addstr(dir, DEFAULT_GIT_DIR_ENVIRONMENT); 934 gitdirenv =read_gitfile_gently(dir->buf, die_on_error ? 935 NULL : &error_code); 936if(!gitdirenv) { 937if(die_on_error || 938 error_code == READ_GITFILE_ERR_NOT_A_FILE) { 939/* NEEDSWORK: fail if .git is not file nor dir */ 940if(is_git_directory(dir->buf)) 941 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT; 942}else if(error_code != READ_GITFILE_ERR_STAT_FAILED) 943return GIT_DIR_INVALID_GITFILE; 944} 945strbuf_setlen(dir, offset); 946if(gitdirenv) { 947strbuf_addstr(gitdir, gitdirenv); 948return GIT_DIR_DISCOVERED; 949} 950 951if(is_git_directory(dir->buf)) { 952strbuf_addstr(gitdir,"."); 953return GIT_DIR_BARE; 954} 955 956if(offset <= min_offset) 957return GIT_DIR_HIT_CEILING; 958 959while(--offset > ceil_offset && !is_dir_sep(dir->buf[offset])) 960;/* continue */ 961if(offset <= ceil_offset) 962return GIT_DIR_HIT_CEILING; 963 964strbuf_setlen(dir, offset > min_offset ? offset : min_offset); 965if(one_filesystem && 966 current_device !=get_device_or_die(dir->buf, NULL, offset)) 967return GIT_DIR_HIT_MOUNT_POINT; 968} 969} 970 971intdiscover_git_directory(struct strbuf *commondir, 972struct strbuf *gitdir) 973{ 974struct strbuf dir = STRBUF_INIT, err = STRBUF_INIT; 975size_t gitdir_offset = gitdir->len, cwd_len; 976size_t commondir_offset = commondir->len; 977struct repository_format candidate; 978 979if(strbuf_getcwd(&dir)) 980return-1; 981 982 cwd_len = dir.len; 983if(setup_git_directory_gently_1(&dir, gitdir,0) <=0) { 984strbuf_release(&dir); 985return-1; 986} 987 988/* 989 * The returned gitdir is relative to dir, and if dir does not reflect 990 * the current working directory, we simply make the gitdir absolute. 991 */ 992if(dir.len < cwd_len && !is_absolute_path(gitdir->buf + gitdir_offset)) { 993/* Avoid a trailing "/." */ 994if(!strcmp(".", gitdir->buf + gitdir_offset)) 995strbuf_setlen(gitdir, gitdir_offset); 996else 997strbuf_addch(&dir,'/'); 998strbuf_insert(gitdir, gitdir_offset, dir.buf, dir.len); 999}10001001get_common_dir(commondir, gitdir->buf + gitdir_offset);10021003strbuf_reset(&dir);1004strbuf_addf(&dir,"%s/config", commondir->buf + commondir_offset);1005read_repository_format(&candidate, dir.buf);1006strbuf_release(&dir);10071008if(verify_repository_format(&candidate, &err) <0) {1009warning("ignoring git dir '%s':%s",1010 gitdir->buf + gitdir_offset, err.buf);1011strbuf_release(&err);1012strbuf_setlen(commondir, commondir_offset);1013strbuf_setlen(gitdir, gitdir_offset);1014return-1;1015}10161017return0;1018}10191020const char*setup_git_directory_gently(int*nongit_ok)1021{1022static struct strbuf cwd = STRBUF_INIT;1023struct strbuf dir = STRBUF_INIT, gitdir = STRBUF_INIT;1024const char*prefix, *env_prefix;10251026/*1027 * We may have read an incomplete configuration before1028 * setting-up the git directory. If so, clear the cache so1029 * that the next queries to the configuration reload complete1030 * configuration (including the per-repo config file that we1031 * ignored previously).1032 */1033git_config_clear();10341035/*1036 * Let's assume that we are in a git repository.1037 * If it turns out later that we are somewhere else, the value will be1038 * updated accordingly.1039 */1040if(nongit_ok)1041*nongit_ok =0;10421043if(strbuf_getcwd(&cwd))1044die_errno(_("Unable to read current working directory"));1045strbuf_addbuf(&dir, &cwd);10461047switch(setup_git_directory_gently_1(&dir, &gitdir,1)) {1048case GIT_DIR_NONE:1049 prefix = NULL;1050break;1051case GIT_DIR_EXPLICIT:1052 prefix =setup_explicit_git_dir(gitdir.buf, &cwd, nongit_ok);1053break;1054case GIT_DIR_DISCOVERED:1055if(dir.len < cwd.len &&chdir(dir.buf))1056die(_("Cannot change to '%s'"), dir.buf);1057 prefix =setup_discovered_git_dir(gitdir.buf, &cwd, dir.len,1058 nongit_ok);1059break;1060case GIT_DIR_BARE:1061if(dir.len < cwd.len &&chdir(dir.buf))1062die(_("Cannot change to '%s'"), dir.buf);1063 prefix =setup_bare_git_dir(&cwd, dir.len, nongit_ok);1064break;1065case GIT_DIR_HIT_CEILING:1066 prefix =setup_nongit(cwd.buf, nongit_ok);1067break;1068case GIT_DIR_HIT_MOUNT_POINT:1069if(nongit_ok) {1070*nongit_ok =1;1071strbuf_release(&cwd);1072strbuf_release(&dir);1073return NULL;1074}1075die(_("Not a git repository (or any parent up to mount point%s)\n"1076"Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set)."),1077 dir.buf);1078default:1079die("BUG: unhandled setup_git_directory_1() result");1080}10811082/*1083 * NEEDSWORK: This was a hack in order to get ls-files and grep to have1084 * properly formated output when recursing submodules. Once ls-files1085 * and grep have been changed to perform this recursing in-process this1086 * needs to be removed.1087 */1088 env_prefix =getenv(GIT_TOPLEVEL_PREFIX_ENVIRONMENT);1089if(env_prefix)1090 prefix = env_prefix;10911092if(prefix)1093setenv(GIT_PREFIX_ENVIRONMENT, prefix,1);1094else1095setenv(GIT_PREFIX_ENVIRONMENT,"",1);10961097 startup_info->have_repository = !nongit_ok || !*nongit_ok;1098 startup_info->prefix = prefix;10991100/*1101 * Not all paths through the setup code will call 'set_git_dir()' (which1102 * directly sets up the environment) so in order to guarantee that the1103 * environment is in a consistent state after setup, explicitly setup1104 * the environment if we have a repository.1105 *1106 * NEEDSWORK: currently we allow bogus GIT_DIR values to be set in some1107 * code paths so we also need to explicitly setup the environment if1108 * the user has set GIT_DIR. It may be beneficial to disallow bogus1109 * GIT_DIR values at some point in the future.1110 */1111if(startup_info->have_repository ||getenv(GIT_DIR_ENVIRONMENT))1112setup_git_env();11131114strbuf_release(&dir);1115strbuf_release(&gitdir);11161117return prefix;1118}11191120intgit_config_perm(const char*var,const char*value)1121{1122int i;1123char*endptr;11241125if(value == NULL)1126return PERM_GROUP;11271128if(!strcmp(value,"umask"))1129return PERM_UMASK;1130if(!strcmp(value,"group"))1131return PERM_GROUP;1132if(!strcmp(value,"all") ||1133!strcmp(value,"world") ||1134!strcmp(value,"everybody"))1135return PERM_EVERYBODY;11361137/* Parse octal numbers */1138 i =strtol(value, &endptr,8);11391140/* If not an octal number, maybe true/false? */1141if(*endptr !=0)1142returngit_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;11431144/*1145 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is1146 * a chmod value to restrict to.1147 */1148switch(i) {1149case PERM_UMASK:/* 0 */1150return PERM_UMASK;1151case OLD_PERM_GROUP:/* 1 */1152return PERM_GROUP;1153case OLD_PERM_EVERYBODY:/* 2 */1154return PERM_EVERYBODY;1155}11561157/* A filemode value was given: 0xxx */11581159if((i &0600) !=0600)1160die(_("Problem with core.sharedRepository filemode value "1161"(0%.3o).\nThe owner of files must always have "1162"read and write permissions."), i);11631164/*1165 * Mask filemode value. Others can not get write permission.1166 * x flags for directories are handled separately.1167 */1168return-(i &0666);1169}11701171voidcheck_repository_format(void)1172{1173check_repository_format_gently(get_git_dir(), NULL);1174 startup_info->have_repository =1;1175}11761177/*1178 * Returns the "prefix", a path to the current working directory1179 * relative to the work tree root, or NULL, if the current working1180 * directory is not a strict subdirectory of the work tree root. The1181 * prefix always ends with a '/' character.1182 */1183const char*setup_git_directory(void)1184{1185returnsetup_git_directory_gently(NULL);1186}11871188const char*resolve_gitdir_gently(const char*suspect,int*return_error_code)1189{1190if(is_git_directory(suspect))1191return suspect;1192returnread_gitfile_gently(suspect, return_error_code);1193}11941195/* if any standard file descriptor is missing open it to /dev/null */1196voidsanitize_stdfds(void)1197{1198int fd =open("/dev/null", O_RDWR,0);1199while(fd != -1&& fd <2)1200 fd =dup(fd);1201if(fd == -1)1202die_errno("open /dev/null or dup failed");1203if(fd >2)1204close(fd);1205}12061207intdaemonize(void)1208{1209#ifdef NO_POSIX_GOODIES1210 errno = ENOSYS;1211return-1;1212#else1213switch(fork()) {1214case0:1215break;1216case-1:1217die_errno("fork failed");1218default:1219exit(0);1220}1221if(setsid() == -1)1222die_errno("setsid failed");1223close(0);1224close(1);1225close(2);1226sanitize_stdfds();1227return0;1228#endif1229}