diff options
Diffstat (limited to 'third_party/git/builtin/init-db.c')
| -rw-r--r-- | third_party/git/builtin/init-db.c | 705 |
1 files changed, 705 insertions, 0 deletions
diff --git a/third_party/git/builtin/init-db.c b/third_party/git/builtin/init-db.c new file mode 100644 index 000000000000..01bc648d416f --- /dev/null +++ b/third_party/git/builtin/init-db.c @@ -0,0 +1,705 @@ +/* + * GIT - The information manager from hell + * + * Copyright (C) Linus Torvalds, 2005 + */ +#include "cache.h" +#include "config.h" +#include "refs.h" +#include "builtin.h" +#include "exec-cmd.h" +#include "parse-options.h" +#include "worktree.h" + +#ifndef DEFAULT_GIT_TEMPLATE_DIR +#define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates" +#endif + +#ifdef NO_TRUSTABLE_FILEMODE +#define TEST_FILEMODE 0 +#else +#define TEST_FILEMODE 1 +#endif + +#define GIT_DEFAULT_HASH_ENVIRONMENT "GIT_DEFAULT_HASH" + +static int init_is_bare_repository = 0; +static int init_shared_repository = -1; +static const char *init_db_template_dir; + +static void copy_templates_1(struct strbuf *path, struct strbuf *template_path, + DIR *dir) +{ + size_t path_baselen = path->len; + size_t template_baselen = template_path->len; + struct dirent *de; + + /* Note: if ".git/hooks" file exists in the repository being + * re-initialized, /etc/core-git/templates/hooks/update would + * cause "git init" to fail here. I think this is sane but + * it means that the set of templates we ship by default, along + * with the way the namespace under .git/ is organized, should + * be really carefully chosen. + */ + safe_create_dir(path->buf, 1); + while ((de = readdir(dir)) != NULL) { + struct stat st_git, st_template; + int exists = 0; + + strbuf_setlen(path, path_baselen); + strbuf_setlen(template_path, template_baselen); + + if (de->d_name[0] == '.') + continue; + strbuf_addstr(path, de->d_name); + strbuf_addstr(template_path, de->d_name); + if (lstat(path->buf, &st_git)) { + if (errno != ENOENT) + die_errno(_("cannot stat '%s'"), path->buf); + } + else + 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); + if (!subdir) + die_errno(_("cannot opendir '%s'"), template_path->buf); + strbuf_addch(path, '/'); + strbuf_addch(template_path, '/'); + copy_templates_1(path, template_path, subdir); + closedir(subdir); + } + else if (exists) + continue; + else if (S_ISLNK(st_template.st_mode)) { + struct strbuf lnk = STRBUF_INIT; + if (strbuf_readlink(&lnk, template_path->buf, + 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'"), + lnk.buf, path->buf); + strbuf_release(&lnk); + } + 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'"), + template_path->buf, path->buf); + } + else + error(_("ignoring template %s"), template_path->buf); + } +} + +static void copy_templates(const char *template_dir) +{ + struct strbuf path = STRBUF_INIT; + struct strbuf template_path = STRBUF_INIT; + size_t template_len; + struct repository_format template_format = REPOSITORY_FORMAT_INIT; + struct strbuf err = STRBUF_INIT; + DIR *dir; + char *to_free = NULL; + + if (!template_dir) + template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT); + if (!template_dir) + template_dir = init_db_template_dir; + if (!template_dir) + template_dir = to_free = system_path(DEFAULT_GIT_TEMPLATE_DIR); + if (!template_dir[0]) { + free(to_free); + return; + } + + strbuf_addstr(&template_path, template_dir); + strbuf_complete(&template_path, '/'); + template_len = template_path.len; + + dir = opendir(template_path.buf); + if (!dir) { + warning(_("templates not found in %s"), template_dir); + goto free_return; + } + + /* Make sure that template is from the correct vintage */ + strbuf_addstr(&template_path, "config"); + read_repository_format(&template_format, template_path.buf); + strbuf_setlen(&template_path, template_len); + + /* + * No mention of version at all is OK, but anything else should be + * verified. + */ + if (template_format.version >= 0 && + verify_repository_format(&template_format, &err) < 0) { + warning(_("not copying templates from '%s': %s"), + template_dir, err.buf); + strbuf_release(&err); + goto close_free_return; + } + + strbuf_addstr(&path, get_git_common_dir()); + strbuf_complete(&path, '/'); + copy_templates_1(&path, &template_path, dir); +close_free_return: + closedir(dir); +free_return: + free(to_free); + strbuf_release(&path); + strbuf_release(&template_path); + clear_repository_format(&template_format); +} + +static int git_init_db_config(const char *k, const char *v, void *cb) +{ + if (!strcmp(k, "init.templatedir")) + return git_config_pathname(&init_db_template_dir, k, v); + + if (starts_with(k, "core.")) + return platform_core_config(k, v, cb); + + return 0; +} + +/* + * If the git_dir is not directly inside the working tree, then git will not + * find it by default, and we need to set the worktree explicitly. + */ +static int needs_work_tree_config(const char *git_dir, const char *work_tree) +{ + if (!strcmp(work_tree, "/") && !strcmp(git_dir, "/.git")) + return 0; + if (skip_prefix(git_dir, work_tree, &git_dir) && + !strcmp(git_dir, "/.git")) + return 0; + return 1; +} + +void initialize_repository_version(int hash_algo, int reinit) +{ + char repo_version_string[10]; + int repo_version = GIT_REPO_VERSION; + + if (hash_algo != GIT_HASH_SHA1) + repo_version = GIT_REPO_VERSION_READ; + + /* This forces creation of new config file */ + xsnprintf(repo_version_string, sizeof(repo_version_string), + "%d", repo_version); + git_config_set("core.repositoryformatversion", repo_version_string); + + if (hash_algo != GIT_HASH_SHA1) + git_config_set("extensions.objectformat", + hash_algos[hash_algo].name); + else if (reinit) + git_config_set_gently("extensions.objectformat", NULL); +} + +static int create_default_files(const char *template_path, + const char *original_git_dir, + const char *initial_branch, + const struct repository_format *fmt) +{ + struct stat st1; + struct strbuf buf = STRBUF_INIT; + char *path; + char junk[2]; + int reinit; + int filemode; + struct strbuf err = STRBUF_INIT; + + /* Just look for `init.templatedir` */ + init_db_template_dir = NULL; /* re-set in case it was set before */ + git_config(git_init_db_config, NULL); + + /* + * First copy the templates -- we might have the default + * config file there, in which case we would want to read + * from it after installing. + * + * Before reading that config, we also need to clear out any cached + * values (since we've just potentially changed what's available on + * disk). + */ + copy_templates(template_path); + git_config_clear(); + reset_shared_repository(); + git_config(git_default_config, NULL); + + /* + * We must make sure command-line options continue to override any + * values we might have just re-read from the config. + */ + is_bare_repository_cfg = init_is_bare_repository; + if (init_shared_repository != -1) + set_shared_repository(init_shared_repository); + + /* + * We would have created the above under user's umask -- under + * shared-repository settings, we would need to fix them up. + */ + if (get_shared_repository()) { + adjust_shared_perm(get_git_dir()); + } + + /* + * We need to create a "refs" dir in any case so that older + * versions of git can tell that this is a repository. + */ + safe_create_dir(git_path("refs"), 1); + adjust_shared_perm(git_path("refs")); + + if (refs_init_db(&err)) + die("failed to set up refs db: %s", err.buf); + + /* + * Point the HEAD symref to the initial branch with if HEAD does + * not yet exist. + */ + path = git_path_buf(&buf, "HEAD"); + reinit = (!access(path, R_OK) + || readlink(path, junk, sizeof(junk)-1) != -1); + if (!reinit) { + char *ref; + + if (!initial_branch) + initial_branch = git_default_branch_name(); + + ref = xstrfmt("refs/heads/%s", initial_branch); + if (check_refname_format(ref, 0) < 0) + die(_("invalid initial branch name: '%s'"), + initial_branch); + + if (create_symref("HEAD", ref, NULL) < 0) + exit(1); + free(ref); + } + + initialize_repository_version(fmt->hash_algo, 0); + + /* Check filemode trustability */ + path = git_path_buf(&buf, "config"); + filemode = TEST_FILEMODE; + if (TEST_FILEMODE && !lstat(path, &st1)) { + struct stat st2; + filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) && + !lstat(path, &st2) && + st1.st_mode != st2.st_mode && + !chmod(path, st1.st_mode)); + if (filemode && !reinit && (st1.st_mode & S_IXUSR)) + filemode = 0; + } + git_config_set("core.filemode", filemode ? "true" : "false"); + + if (is_bare_repository()) + git_config_set("core.bare", "true"); + else { + const char *work_tree = get_git_work_tree(); + git_config_set("core.bare", "false"); + /* allow template config file to override the default */ + 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); + } + + if (!reinit) { + /* Check if symlink is supported in the work tree */ + path = git_path_buf(&buf, "tXXXXXX"); + if (!close(xmkstemp(path)) && + !unlink(path) && + !symlink("testing", path) && + !lstat(path, &st1) && + S_ISLNK(st1.st_mode)) + unlink(path); /* good */ + else + git_config_set("core.symlinks", "false"); + + /* Check if the filesystem is case-insensitive */ + path = git_path_buf(&buf, "CoNfIg"); + if (!access(path, F_OK)) + git_config_set("core.ignorecase", "true"); + probe_utf8_pathname_composition(); + } + + strbuf_release(&buf); + return reinit; +} + +static void create_object_directory(void) +{ + struct strbuf path = STRBUF_INIT; + size_t baselen; + + strbuf_addstr(&path, get_object_directory()); + baselen = path.len; + + safe_create_dir(path.buf, 1); + + strbuf_setlen(&path, baselen); + strbuf_addstr(&path, "/pack"); + safe_create_dir(path.buf, 1); + + strbuf_setlen(&path, baselen); + strbuf_addstr(&path, "/info"); + safe_create_dir(path.buf, 1); + + strbuf_release(&path); +} + +static void separate_git_dir(const char *git_dir, const char *git_link) +{ + struct stat st; + + if (!stat(git_link, &st)) { + const char *src; + + if (S_ISREG(st.st_mode)) + src = read_gitfile(git_link); + else if (S_ISDIR(st.st_mode)) + src = git_link; + else + die(_("unable to handle file type %d"), (int)st.st_mode); + + if (rename(src, git_dir)) + die_errno(_("unable to move %s to %s"), src, git_dir); + repair_worktrees(NULL, NULL); + } + + write_file(git_link, "gitdir: %s", git_dir); +} + +static void validate_hash_algorithm(struct repository_format *repo_fmt, int hash) +{ + const char *env = getenv(GIT_DEFAULT_HASH_ENVIRONMENT); + /* + * If we already have an initialized repo, don't allow the user to + * specify a different algorithm, as that could cause corruption. + * Otherwise, if the user has specified one on the command line, use it. + */ + if (repo_fmt->version >= 0 && hash != GIT_HASH_UNKNOWN && hash != repo_fmt->hash_algo) + die(_("attempt to reinitialize repository with different hash")); + else if (hash != GIT_HASH_UNKNOWN) + repo_fmt->hash_algo = hash; + else if (env) { + int env_algo = hash_algo_by_name(env); + if (env_algo == GIT_HASH_UNKNOWN) + die(_("unknown hash algorithm '%s'"), env); + repo_fmt->hash_algo = env_algo; + } +} + +int init_db(const char *git_dir, const char *real_git_dir, + const char *template_dir, int hash, const char *initial_branch, + unsigned int flags) +{ + int reinit; + int exist_ok = flags & INIT_DB_EXIST_OK; + char *original_git_dir = real_pathdup(git_dir, 1); + struct repository_format repo_fmt = REPOSITORY_FORMAT_INIT; + + if (real_git_dir) { + struct stat st; + + if (!exist_ok && !stat(git_dir, &st)) + die(_("%s already exists"), git_dir); + + if (!exist_ok && !stat(real_git_dir, &st)) + die(_("%s already exists"), real_git_dir); + + set_git_dir(real_git_dir, 1); + git_dir = get_git_dir(); + separate_git_dir(git_dir, original_git_dir); + } + else { + set_git_dir(git_dir, 1); + git_dir = get_git_dir(); + } + startup_info->have_repository = 1; + + /* Just look for `core.hidedotfiles` */ + git_config(git_init_db_config, NULL); + + safe_create_dir(git_dir, 0); + + init_is_bare_repository = is_bare_repository(); + + /* Check to see if the repository version is right. + * Note that a newly created repository does not have + * config file, so this will not fail. What we are catching + * is an attempt to reinitialize new repository with an old tool. + */ + check_repository_format(&repo_fmt); + + validate_hash_algorithm(&repo_fmt, hash); + + reinit = create_default_files(template_dir, original_git_dir, + initial_branch, &repo_fmt); + if (reinit && initial_branch) + warning(_("re-init: ignored --initial-branch=%s"), + initial_branch); + + create_object_directory(); + + if (get_shared_repository()) { + char buf[10]; + /* We do not spell "group" and such, so that + * the configuration can be read by older version + * of git. Note, we use octal numbers for new share modes, + * and compatibility values for PERM_GROUP and + * PERM_EVERYBODY. + */ + if (get_shared_repository() < 0) + /* 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); + else + BUG("invalid value for shared_repository"); + git_config_set("core.sharedrepository", buf); + git_config_set("receive.denyNonFastforwards", "true"); + } + + if (!(flags & INIT_DB_QUIET)) { + int len = strlen(git_dir); + + if (reinit) + 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] != '/' ? "/" : ""); + else + 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] != '/' ? "/" : ""); + } + + free(original_git_dir); + return 0; +} + +static int guess_repository_type(const char *git_dir) +{ + const char *slash; + char *cwd; + int cwd_is_git_dir; + + /* + * "GIT_DIR=. git init" is always bare. + * "GIT_DIR=`pwd` git init" too. + */ + if (!strcmp(".", git_dir)) + return 1; + cwd = xgetcwd(); + cwd_is_git_dir = !strcmp(git_dir, cwd); + free(cwd); + if (cwd_is_git_dir) + return 1; + /* + * "GIT_DIR=.git or GIT_DIR=something/.git is usually not. + */ + if (!strcmp(git_dir, ".git")) + return 0; + slash = strrchr(git_dir, '/'); + if (slash && !strcmp(slash, "/.git")) + return 0; + + /* + * Otherwise it is often bare. At this point + * we are just guessing. + */ + return 1; +} + +static int shared_callback(const struct option *opt, const char *arg, int unset) +{ + BUG_ON_OPT_NEG(unset); + *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP; + return 0; +} + +static const char *const init_db_usage[] = { + N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [<directory>]"), + NULL +}; + +/* + * If you want to, you can share the DB area with any number of branches. + * That has advantages: you can save space by sharing all the SHA1 objects. + * On the other hand, it might just make lookup slower and messier. You + * be the judge. The default case is to have one DB per managed directory. + */ +int cmd_init_db(int argc, const char **argv, const char *prefix) +{ + const char *git_dir; + const char *real_git_dir = NULL; + const char *work_tree; + const char *template_dir = NULL; + unsigned int flags = 0; + const char *object_format = NULL; + const char *initial_branch = NULL; + int hash_algo = GIT_HASH_UNKNOWN; + const struct option init_db_options[] = { + OPT_STRING(0, "template", &template_dir, N_("template-directory"), + 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, + N_("permissions"), + 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"), + N_("separate git dir from working tree")), + OPT_STRING('b', "initial-branch", &initial_branch, N_("name"), + N_("override the name of the initial branch")), + OPT_STRING(0, "object-format", &object_format, N_("hash"), + N_("specify the hash algorithm to use")), + OPT_END() + }; + + argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0); + + if (real_git_dir && is_bare_repository_cfg == 1) + die(_("--separate-git-dir and --bare are mutually exclusive")); + + if (real_git_dir && !is_absolute_path(real_git_dir)) + real_git_dir = real_pathdup(real_git_dir, 1); + + if (template_dir && *template_dir && !is_absolute_path(template_dir)) + template_dir = absolute_pathdup(template_dir); + + if (argc == 1) { + int mkdir_tried = 0; + retry: + if (chdir(argv[0]) < 0) { + if (!mkdir_tried) { + int saved; + /* + * At this point we haven't read any configuration, + * and we know shared_repository should always be 0; + * but just in case we play safe. + */ + saved = get_shared_repository(); + set_shared_repository(0); + switch (safe_create_leading_directories_const(argv[0])) { + case SCLD_OK: + case SCLD_PERMS: + break; + case SCLD_EXISTS: + errno = EEXIST; + /* fallthru */ + default: + die_errno(_("cannot mkdir %s"), argv[0]); + break; + } + set_shared_repository(saved); + if (mkdir(argv[0], 0777) < 0) + die_errno(_("cannot mkdir %s"), argv[0]); + mkdir_tried = 1; + goto retry; + } + die_errno(_("cannot chdir to %s"), argv[0]); + } + } else if (0 < argc) { + usage(init_db_usage[0]); + } + if (is_bare_repository_cfg == 1) { + char *cwd = xgetcwd(); + setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0); + free(cwd); + } + + if (object_format) { + hash_algo = hash_algo_by_name(object_format); + if (hash_algo == GIT_HASH_UNKNOWN) + die(_("unknown hash algorithm '%s'"), object_format); + } + + if (init_shared_repository != -1) + set_shared_repository(init_shared_repository); + + /* + * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR + * without --bare. Catch the error early. + */ + 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 " + "specifying %s (or --git-dir=<directory>)"), + GIT_WORK_TREE_ENVIRONMENT, + GIT_DIR_ENVIRONMENT); + + /* + * Set up the default .git directory contents + */ + if (!git_dir) + git_dir = DEFAULT_GIT_DIR_ENVIRONMENT; + + /* + * When --separate-git-dir is used inside a linked worktree, take + * care to ensure that the common .git/ directory is relocated, not + * the worktree-specific .git/worktrees/<id>/ directory. + */ + if (real_git_dir) { + int err; + const char *p; + struct strbuf sb = STRBUF_INIT; + + p = read_gitfile_gently(git_dir, &err); + if (p && get_common_dir(&sb, p)) { + struct strbuf mainwt = STRBUF_INIT; + + strbuf_addbuf(&mainwt, &sb); + strbuf_strip_suffix(&mainwt, "/.git"); + if (chdir(mainwt.buf) < 0) + die_errno(_("cannot chdir to %s"), mainwt.buf); + strbuf_release(&mainwt); + git_dir = strbuf_detach(&sb, NULL); + } + strbuf_release(&sb); + } + + if (is_bare_repository_cfg < 0) + is_bare_repository_cfg = guess_repository_type(git_dir); + + if (!is_bare_repository_cfg) { + const char *git_dir_parent = strrchr(git_dir, '/'); + if (git_dir_parent) { + char *rel = xstrndup(git_dir, git_dir_parent - git_dir); + git_work_tree_cfg = real_pathdup(rel, 1); + free(rel); + } + if (!git_work_tree_cfg) + git_work_tree_cfg = xgetcwd(); + if (work_tree) + set_git_work_tree(work_tree); + else + set_git_work_tree(git_work_tree_cfg); + if (access(get_git_work_tree(), X_OK)) + die_errno (_("Cannot access work tree '%s'"), + get_git_work_tree()); + } + else { + if (real_git_dir) + die(_("--separate-git-dir incompatible with bare repository")); + if (work_tree) + set_git_work_tree(work_tree); + } + + UNLEAK(real_git_dir); + UNLEAK(git_dir); + UNLEAK(work_tree); + + flags |= INIT_DB_EXIST_OK; + return init_db(git_dir, real_git_dir, template_dir, hash_algo, + initial_branch, flags); +} |