Public Git Hosting - git/debian.git/blob

1 /*

2 * GIT - The information manager from hell

3 *

4 * Copyright (C) Linus Torvalds, 2005

5 */

6 #include "cache.h"

7 #include "config.h"

8 #include "refs.h"

9 #include "builtin.h"

10 #include "exec-cmd.h"

11 #include "parse-options.h"

12 #include "worktree.h"

14 #ifdef NO_TRUSTABLE_FILEMODE

15 #define TEST_FILEMODE 0

16 #else

17 #define TEST_FILEMODE 1

18 #endif

20 #define GIT_DEFAULT_HASH_ENVIRONMENT "GIT_DEFAULT_HASH"

22 static int init_is_bare_repository = 0;

23 static int init_shared_repository = -1;

static void copy_templates_1(struct strbuf *path, struct strbuf *template_path,

26 DIR *dir)

27 {

28 size_t path_baselen = path->len;

29 size_t template_baselen = template_path->len;

30 struct dirent *de;

32 /* Note: if ".git/hooks" file exists in the repository being

33 * re-initialized, /etc/core-git/templates/hooks/update would

34 * cause "git init" to fail here. I think this is sane but

35 * it means that the set of templates we ship by default, along

36 * with the way the namespace under .git/ is organized, should

37 * be really carefully chosen.

38 */

        safe_create_dir(path->buf, 1);

        while ((de = readdir(dir)) != NULL) {

41 struct stat st_git, st_template;

42 int exists = 0;

44 strbuf_setlen(path, path_baselen);

45 strbuf_setlen(template_path, template_baselen);

                if (de->d_name[0] == '.')

48 continue;

                strbuf_addstr(path, de->d_name);

                strbuf_addstr(template_path, de->d_name);

                if (lstat(path->buf, &st_git)) {

52 if (errno != ENOENT)

                                die_errno(_("cannot stat '%s'"), path->buf);

54 }

55 else

56 exists = 1;

                if (lstat(template_path->buf, &st_template))

                        die_errno(_("cannot stat template '%s'"), template_path->buf);

                if (S_ISDIR(st_template.st_mode)) {

                        DIR *subdir = opendir(template_path->buf);

63 if (!subdir)

                                die_errno(_("cannot opendir '%s'"), template_path->buf);

                        strbuf_addch(path, '/');

                        strbuf_addch(template_path, '/');

                        copy_templates_1(path, template_path, subdir);

68 closedir(subdir);

69 }

70 else if (exists)

71 continue;

                else if (S_ISLNK(st_template.st_mode)) {

73 struct strbuf lnk = STRBUF_INIT;

                        if (strbuf_readlink(&lnk, template_path->buf,

75 st_template.st_size) < 0)

                                die_errno(_("cannot readlink '%s'"), template_path->buf);

                        if (symlink(lnk.buf, path->buf))

                                die_errno(_("cannot symlink '%s' '%s'"),

79 lnk.buf, path->buf);

80 strbuf_release(&lnk);

81 }

                else if (S_ISREG(st_template.st_mode)) {

                        if (copy_file(path->buf, template_path->buf, st_template.st_mode))

                                die_errno(_("cannot copy '%s' to '%s'"),

85 template_path->buf, path->buf);

86 }

87 else

                        error(_("ignoring template %s"), template_path->buf);

89 }

90 }

static void copy_templates(const char *option_template)

93 {

        const char *template_dir = get_template_dir(option_template);

95 struct strbuf path = STRBUF_INIT;

96 struct strbuf template_path = STRBUF_INIT;

97 size_t template_len;

98 struct repository_format template_format = REPOSITORY_FORMAT_INIT;

99 struct strbuf err = STRBUF_INIT;

100 DIR *dir;

101 char *to_free = NULL;

102

103 if (!template_dir || !*template_dir)

104 return;

105

106 strbuf_addstr(&template_path, template_dir);

        strbuf_complete(&template_path, '/');

108 template_len = template_path.len;

109

        dir = opendir(template_path.buf);

111 if (!dir) {

                warning(_("templates not found in %s"), template_dir);

113 goto free_return;

114 }

115

116 /* Make sure that template is from the correct vintage */

        strbuf_addstr(&template_path, "config");

        read_repository_format(&template_format, template_path.buf);

119 strbuf_setlen(&template_path, template_len);

120

121 /*

122 * No mention of version at all is OK, but anything else should be

123 * verified.

124 */

        if (template_format.version >= 0 &&

            verify_repository_format(&template_format, &err) < 0) {

                warning(_("not copying templates from '%s': %s"),

128 template_dir, err.buf);

129 strbuf_release(&err);

130 goto close_free_return;

131 }

132

        strbuf_addstr(&path, get_git_common_dir());

        strbuf_complete(&path, '/');

        copy_templates_1(&path, &template_path, dir);

136 close_free_return:

137 closedir(dir);

138 free_return:

139 free(to_free);

140 strbuf_release(&path);

141 strbuf_release(&template_path);

142 clear_repository_format(&template_format);

143 }

144

145 /*

146 * If the git_dir is not directly inside the working tree, then git will not

147 * find it by default, and we need to set the worktree explicitly.

148 */

static int needs_work_tree_config(const char *git_dir, const char *work_tree)

150 {

        if (!strcmp(work_tree, "/") && !strcmp(git_dir, "/.git"))

152 return 0;

        if (skip_prefix(git_dir, work_tree, &git_dir) &&

            !strcmp(git_dir, "/.git"))

155 return 0;

156 return 1;

157 }

158

void initialize_repository_version(int hash_algo, int reinit)

160 {

161 char repo_version_string[10];

162 int repo_version = GIT_REPO_VERSION;

163

164 if (hash_algo != GIT_HASH_SHA1)

165 repo_version = GIT_REPO_VERSION_READ;

166

167 /* This forces creation of new config file */

        xsnprintf(repo_version_string, sizeof(repo_version_string),

169 "%d", repo_version);

        git_config_set("core.repositoryformatversion", repo_version_string);

171

172 if (hash_algo != GIT_HASH_SHA1)

173 git_config_set("extensions.objectformat",

174 hash_algos[hash_algo].name);

175 else if (reinit)

                git_config_set_gently("extensions.objectformat", NULL);

177 }

178

static int create_default_files(const char *template_path,

180 const char *original_git_dir,

181 const char *initial_branch,

182 const struct repository_format *fmt,

183 int quiet)

184 {

185 struct stat st1;

186 struct strbuf buf = STRBUF_INIT;

187 char *path;

188 char junk[2];

189 int reinit;

190 int filemode;

191 struct strbuf err = STRBUF_INIT;

        const char *work_tree = get_git_work_tree();

193

194 /*

195 * First copy the templates -- we might have the default

196 * config file there, in which case we would want to read

197 * from it after installing.

198 *

199 * Before reading that config, we also need to clear out any cached

200 * values (since we've just potentially changed what's available on

201 * disk).

202 */

203 copy_templates(template_path);

204 git_config_clear();

205 reset_shared_repository();

206 git_config(git_default_config, NULL);

207

208 /*

209 * We must make sure command-line options continue to override any

210 * values we might have just re-read from the config.

211 */

212 is_bare_repository_cfg = init_is_bare_repository || !work_tree;

        if (init_shared_repository != -1)

214 set_shared_repository(init_shared_repository);

215

216 /*

217 * We would have created the above under user's umask -- under

218 * shared-repository settings, we would need to fix them up.

219 */

220 if (get_shared_repository()) {

221 adjust_shared_perm(get_git_dir());

222 }

223

224 /*

225 * We need to create a "refs" dir in any case so that older

226 * versions of git can tell that this is a repository.

227 */

        safe_create_dir(git_path("refs"), 1);

        adjust_shared_perm(git_path("refs"));

230

        if (refs_init_db(&err))

                die("failed to set up refs db: %s", err.buf);

233

234 /*

235 * Point the HEAD symref to the initial branch with if HEAD does

236 * not yet exist.

237 */

        path = git_path_buf(&buf, "HEAD");

        reinit = (!access(path, R_OK)

                  || readlink(path, junk, sizeof(junk)-1) != -1);

241 if (!reinit) {

242 char *ref;

243

244 if (!initial_branch)

245 initial_branch = git_default_branch_name(quiet);

246

                ref = xstrfmt("refs/heads/%s", initial_branch);

                if (check_refname_format(ref, 0) < 0)

                        die(_("invalid initial branch name: '%s'"),

250 initial_branch);

251

                if (create_symref("HEAD", ref, NULL) < 0)

253 exit(1);

254 free(ref);

255 }

256

        initialize_repository_version(fmt->hash_algo, 0);

258

259 /* Check filemode trustability */

        path = git_path_buf(&buf, "config");

261 filemode = TEST_FILEMODE;

        if (TEST_FILEMODE && !lstat(path, &st1)) {

263 struct stat st2;

                filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&

                                !lstat(path, &st2) &&

266 st1.st_mode != st2.st_mode &&

                                !chmod(path, st1.st_mode));

                if (filemode && !reinit && (st1.st_mode & S_IXUSR))

269 filemode = 0;

270 }

        git_config_set("core.filemode", filemode ? "true" : "false");

272

273 if (is_bare_repository())

                git_config_set("core.bare", "true");

275 else {

                git_config_set("core.bare", "false");

277 /* allow template config file to override the default */

278 if (log_all_ref_updates == LOG_REFS_UNSET)

                        git_config_set("core.logallrefupdates", "true");

                if (needs_work_tree_config(original_git_dir, work_tree))

                        git_config_set("core.worktree", work_tree);

282 }

283

284 if (!reinit) {

285 /* Check if symlink is supported in the work tree */

                path = git_path_buf(&buf, "tXXXXXX");

                if (!close(xmkstemp(path)) &&

288 !unlink(path) &&

                    !symlink("testing", path) &&

                    !lstat(path, &st1) &&

291 S_ISLNK(st1.st_mode))

292 unlink(path); /* good */

293 else

                        git_config_set("core.symlinks", "false");

295

296 /* Check if the filesystem is case-insensitive */

                path = git_path_buf(&buf, "CoNfIg");

                if (!access(path, F_OK))

                        git_config_set("core.ignorecase", "true");

300 probe_utf8_pathname_composition();

301 }

302

303 strbuf_release(&buf);

304 return reinit;

305 }

306

static void create_object_directory(void)

308 {

309 struct strbuf path = STRBUF_INIT;

310 size_t baselen;

311

        strbuf_addstr(&path, get_object_directory());

313 baselen = path.len;

314

        safe_create_dir(path.buf, 1);

316

317 strbuf_setlen(&path, baselen);

        strbuf_addstr(&path, "/pack");

        safe_create_dir(path.buf, 1);

320

321 strbuf_setlen(&path, baselen);

        strbuf_addstr(&path, "/info");

        safe_create_dir(path.buf, 1);

324

325 strbuf_release(&path);

326 }

327

static void separate_git_dir(const char *git_dir, const char *git_link)

329 {

330 struct stat st;

331

        if (!stat(git_link, &st)) {

333 const char *src;

334

                if (S_ISREG(st.st_mode))

336 src = read_gitfile(git_link);

                else if (S_ISDIR(st.st_mode))

338 src = git_link;

339 else

                        die(_("unable to handle file type %d"), (int)st.st_mode);

341

                if (rename(src, git_dir))

                        die_errno(_("unable to move %s to %s"), src, git_dir);

344 repair_worktrees(NULL, NULL);

345 }

346

        write_file(git_link, "gitdir: %s", git_dir);

348 }

349

static void validate_hash_algorithm(struct repository_format *repo_fmt, int hash)

351 {

        const char *env = getenv(GIT_DEFAULT_HASH_ENVIRONMENT);

353 /*

354 * If we already have an initialized repo, don't allow the user to

355 * specify a different algorithm, as that could cause corruption.

356 * Otherwise, if the user has specified one on the command line, use it.

357 */

        if (repo_fmt->version >= 0 && hash != GIT_HASH_UNKNOWN && hash != repo_fmt->hash_algo)

                die(_("attempt to reinitialize repository with different hash"));

360 else if (hash != GIT_HASH_UNKNOWN)

361 repo_fmt->hash_algo = hash;

362 else if (env) {

                int env_algo = hash_algo_by_name(env);

364 if (env_algo == GIT_HASH_UNKNOWN)

                        die(_("unknown hash algorithm '%s'"), env);

366 repo_fmt->hash_algo = env_algo;

367 }

368 }

369

int init_db(const char *git_dir, const char *real_git_dir,

            const char *template_dir, int hash, const char *initial_branch,

372 unsigned int flags)

373 {

374 int reinit;

375 int exist_ok = flags & INIT_DB_EXIST_OK;

        char *original_git_dir = real_pathdup(git_dir, 1);

377 struct repository_format repo_fmt = REPOSITORY_FORMAT_INIT;

378

379 if (real_git_dir) {

380 struct stat st;

381

                if (!exist_ok && !stat(git_dir, &st))

                        die(_("%s already exists"), git_dir);

384

                if (!exist_ok && !stat(real_git_dir, &st))

                        die(_("%s already exists"), real_git_dir);

387

                set_git_dir(real_git_dir, 1);

389 git_dir = get_git_dir();

390 separate_git_dir(git_dir, original_git_dir);

391 }

392 else {

                set_git_dir(git_dir, 1);

394 git_dir = get_git_dir();

395 }

396 startup_info->have_repository = 1;

397

398 /* Ensure `core.hidedotfiles` is processed */

399 git_config(platform_core_config, NULL);

400

        safe_create_dir(git_dir, 0);

402

403 init_is_bare_repository = is_bare_repository();

404

405 /* Check to see if the repository version is right.

406 * Note that a newly created repository does not have

407 * config file, so this will not fail. What we are catching

408 * is an attempt to reinitialize new repository with an old tool.

409 */

410 check_repository_format(&repo_fmt);

411

412 validate_hash_algorithm(&repo_fmt, hash);

413

        reinit = create_default_files(template_dir, original_git_dir,

415 initial_branch, &repo_fmt,

416 flags & INIT_DB_QUIET);

417 if (reinit && initial_branch)

                warning(_("re-init: ignored --initial-branch=%s"),

419 initial_branch);

420

421 create_object_directory();

422

423 if (get_shared_repository()) {

424 char buf[10];

425 /* We do not spell "group" and such, so that

426 * the configuration can be read by older version

427 * of git. Note, we use octal numbers for new share modes,

428 * and compatibility values for PERM_GROUP and

429 * PERM_EVERYBODY.

430 */

                if (get_shared_repository() < 0)

432 /* force to the mode value */

                        xsnprintf(buf, sizeof(buf), "0%o", -get_shared_repository());

                else if (get_shared_repository() == PERM_GROUP)

                        xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_GROUP);

                else if (get_shared_repository() == PERM_EVERYBODY)

                        xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_EVERYBODY);

438 else

439 BUG("invalid value for shared_repository");

                git_config_set("core.sharedrepository", buf);

                git_config_set("receive.denyNonFastforwards", "true");

442 }

443

444 if (!(flags & INIT_DB_QUIET)) {

                int len = strlen(git_dir);

446

447 if (reinit)

448 printf(get_shared_repository()

                               ? _("Reinitialized existing shared Git repository in %s%s\n")

                               : _("Reinitialized existing Git repository in %s%s\n"),

                               git_dir, len && git_dir[len-1] != '/' ? "/" : "");

452 else

453 printf(get_shared_repository()

                               ? _("Initialized empty shared Git repository in %s%s\n")

                               : _("Initialized empty Git repository in %s%s\n"),

                               git_dir, len && git_dir[len-1] != '/' ? "/" : "");

457 }

458

459 free(original_git_dir);

460 return 0;

461 }

462

static int guess_repository_type(const char *git_dir)

464 {

465 const char *slash;

466 char *cwd;

467 int cwd_is_git_dir;

468

469 /*

470 * "GIT_DIR=. git init" is always bare.

471 * "GIT_DIR=`pwd` git init" too.

472 */

        if (!strcmp(".", git_dir))

474 return 1;

475 cwd = xgetcwd();

        cwd_is_git_dir = !strcmp(git_dir, cwd);

477 free(cwd);

478 if (cwd_is_git_dir)

479 return 1;

480 /*

481 * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.

482 */

        if (!strcmp(git_dir, ".git"))

484 return 0;

        slash = strrchr(git_dir, '/');

        if (slash && !strcmp(slash, "/.git"))

487 return 0;

488

489 /*

490 * Otherwise it is often bare. At this point

491 * we are just guessing.

492 */

493 return 1;

494 }

495

static int shared_callback(const struct option *opt, const char *arg, int unset)

497 {

498 BUG_ON_OPT_NEG(unset);

        *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;

500 return 0;

501 }

502

503 static const char *const init_db_usage[] = {

        N_("git init [-q | --quiet] [--bare] [--template=<template-directory>]\n"

505 " [--separate-git-dir <git-dir>] [--object-format=<format>]\n"

506 " [-b <branch-name> | --initial-branch=<branch-name>]\n"

507 " [--shared[=<permissions>]] [<directory>]"),

508 NULL

509 };

510

511 /*

512 * If you want to, you can share the DB area with any number of branches.

513 * That has advantages: you can save space by sharing all the SHA1 objects.

514 * On the other hand, it might just make lookup slower and messier. You

515 * be the judge. The default case is to have one DB per managed directory.

516 */

int cmd_init_db(int argc, const char **argv, const char *prefix)

518 {

519 const char *git_dir;

520 const char *real_git_dir = NULL;

521 const char *work_tree;

522 const char *template_dir = NULL;

523 unsigned int flags = 0;

524 const char *object_format = NULL;

525 const char *initial_branch = NULL;

526 int hash_algo = GIT_HASH_UNKNOWN;

527 const struct option init_db_options[] = {

                OPT_STRING(0, "template", &template_dir, N_("template-directory"),

529 N_("directory from which templates will be used")),

                OPT_SET_INT(0, "bare", &is_bare_repository_cfg,

                                N_("create a bare repository"), 1),

                { OPTION_CALLBACK, 0, "shared", &init_shared_repository,

533 N_("permissions"),

534 N_("specify that the git repository is to be shared amongst several users"),

                        PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},

                OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),

                OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),

538 N_("separate git dir from working tree")),

                OPT_STRING('b', "initial-branch", &initial_branch, N_("name"),

540 N_("override the name of the initial branch")),

                OPT_STRING(0, "object-format", &object_format, N_("hash"),

542 N_("specify the hash algorithm to use")),

543 OPT_END()

544 };

545

        argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);

547

        if (real_git_dir && is_bare_repository_cfg == 1)

                die(_("options '%s' and '%s' cannot be used together"), "--separate-git-dir", "--bare");

550

        if (real_git_dir && !is_absolute_path(real_git_dir))

                real_git_dir = real_pathdup(real_git_dir, 1);

553

        if (template_dir && *template_dir && !is_absolute_path(template_dir)) {

555 template_dir = absolute_pathdup(template_dir);

556 UNLEAK(template_dir);

557 }

558

        if (argc == 1) {

560 int mkdir_tried = 0;

561 retry:

                if (chdir(argv[0]) < 0) {

563 if (!mkdir_tried) {

564 int saved;

565 /*

566 * At this point we haven't read any configuration,

567 * and we know shared_repository should always be 0;

568 * but just in case we play safe.

569 */

570 saved = get_shared_repository();

571 set_shared_repository(0);

                                switch (safe_create_leading_directories_const(argv[0])) {

573 case SCLD_OK:

574 case SCLD_PERMS:

575 break;

576 case SCLD_EXISTS:

577 errno = EEXIST;

578 /* fallthru */

579 default:

                                        die_errno(_("cannot mkdir %s"), argv[0]);

581 break;

582 }

583 set_shared_repository(saved);

                                if (mkdir(argv[0], 0777) < 0)

                                        die_errno(_("cannot mkdir %s"), argv[0]);

586 mkdir_tried = 1;

587 goto retry;

588 }

                        die_errno(_("cannot chdir to %s"), argv[0]);

590 }

        } else if (0 < argc) {

                usage(init_db_usage[0]);

593 }

        if (is_bare_repository_cfg == 1) {

                char *cwd = xgetcwd();

                setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);

597 free(cwd);

598 }

599

600 if (object_format) {

601 hash_algo = hash_algo_by_name(object_format);

602 if (hash_algo == GIT_HASH_UNKNOWN)

                        die(_("unknown hash algorithm '%s'"), object_format);

604 }

605

        if (init_shared_repository != -1)

607 set_shared_repository(init_shared_repository);

608

609 /*

610 * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR

611 * without --bare. Catch the error early.

612 */

        git_dir = xstrdup_or_null(getenv(GIT_DIR_ENVIRONMENT));

        work_tree = xstrdup_or_null(getenv(GIT_WORK_TREE_ENVIRONMENT));

        if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)

                die(_("%s (or --work-tree=<directory>) not allowed without "

617 "specifying %s (or --git-dir=<directory>)"),

618 GIT_WORK_TREE_ENVIRONMENT,

619 GIT_DIR_ENVIRONMENT);

620

621 /*

622 * Set up the default .git directory contents

623 */

624 if (!git_dir)

625 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;

626

627 /*

628 * When --separate-git-dir is used inside a linked worktree, take

629 * care to ensure that the common .git/ directory is relocated, not

630 * the worktree-specific .git/worktrees/<id>/ directory.

631 */

632 if (real_git_dir) {

633 int err;

634 const char *p;

635 struct strbuf sb = STRBUF_INIT;

636

                p = read_gitfile_gently(git_dir, &err);

                if (p && get_common_dir(&sb, p)) {

639 struct strbuf mainwt = STRBUF_INIT;

640

641 strbuf_addbuf(&mainwt, &sb);

                        strbuf_strip_suffix(&mainwt, "/.git");

                        if (chdir(mainwt.buf) < 0)

                                die_errno(_("cannot chdir to %s"), mainwt.buf);

645 strbuf_release(&mainwt);

                        git_dir = strbuf_detach(&sb, NULL);

647 }

648 strbuf_release(&sb);

649 }

650

        if (is_bare_repository_cfg < 0)

652 is_bare_repository_cfg = guess_repository_type(git_dir);

653

654 if (!is_bare_repository_cfg) {

                const char *git_dir_parent = strrchr(git_dir, '/');

656 if (git_dir_parent) {

                        char *rel = xstrndup(git_dir, git_dir_parent - git_dir);

                        git_work_tree_cfg = real_pathdup(rel, 1);

659 free(rel);

660 }

661 if (!git_work_tree_cfg)

662 git_work_tree_cfg = xgetcwd();

663 if (work_tree)

664 set_git_work_tree(work_tree);

665 else

666 set_git_work_tree(git_work_tree_cfg);

                if (access(get_git_work_tree(), X_OK))

                        die_errno (_("Cannot access work tree '%s'"),

669 get_git_work_tree());

670 }

671 else {

672 if (real_git_dir)

                        die(_("--separate-git-dir incompatible with bare repository"));

674 if (work_tree)

675 set_git_work_tree(work_tree);

676 }

677

678 UNLEAK(real_git_dir);

679 UNLEAK(git_dir);

680 UNLEAK(work_tree);

681

682 flags |= INIT_DB_EXIST_OK;

        return init_db(git_dir, real_git_dir, template_dir, hash_algo,

684 initial_branch, flags);

685 }