diff options
Diffstat (limited to 'builtin/init-db.c')
| -rw-r--r-- | builtin/init-db.c | 530 |
1 files changed, 530 insertions, 0 deletions
diff --git a/builtin/init-db.c b/builtin/init-db.c new file mode 100644 index 0000000000..e3af9eaa87 --- /dev/null +++ b/builtin/init-db.c @@ -0,0 +1,530 @@ +/* + * GIT - The information manager from hell + * + * Copyright (C) Linus Torvalds, 2005 + */ +#include "cache.h" +#include "builtin.h" +#include "exec_cmd.h" +#include "parse-options.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 + +static int init_is_bare_repository = 0; +static int init_shared_repository = -1; +static const char *init_db_template_dir; + +static void safe_create_dir(const char *dir, int share) +{ + if (mkdir(dir, 0777) < 0) { + if (errno != EEXIST) { + perror(dir); + exit(1); + } + } + else if (share && adjust_shared_perm(dir)) + die("Could not make %s writable by group", dir); +} + +static void copy_templates_1(char *path, int baselen, + char *template, int template_baselen, + DIR *dir) +{ + 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, 1); + while ((de = readdir(dir)) != NULL) { + struct stat st_git, st_template; + int namelen; + int exists = 0; + + if (de->d_name[0] == '.') + continue; + namelen = strlen(de->d_name); + if ((PATH_MAX <= baselen + namelen) || + (PATH_MAX <= template_baselen + namelen)) + die("insanely long template name %s", de->d_name); + memcpy(path + baselen, de->d_name, namelen+1); + memcpy(template + template_baselen, de->d_name, namelen+1); + if (lstat(path, &st_git)) { + if (errno != ENOENT) + die_errno("cannot stat '%s'", path); + } + else + exists = 1; + + if (lstat(template, &st_template)) + die_errno("cannot stat template '%s'", template); + + if (S_ISDIR(st_template.st_mode)) { + DIR *subdir = opendir(template); + int baselen_sub = baselen + namelen; + int template_baselen_sub = template_baselen + namelen; + if (!subdir) + die_errno("cannot opendir '%s'", template); + path[baselen_sub++] = + template[template_baselen_sub++] = '/'; + path[baselen_sub] = + template[template_baselen_sub] = 0; + copy_templates_1(path, baselen_sub, + template, template_baselen_sub, + subdir); + closedir(subdir); + } + else if (exists) + continue; + else if (S_ISLNK(st_template.st_mode)) { + char lnk[256]; + int len; + len = readlink(template, lnk, sizeof(lnk)); + if (len < 0) + die_errno("cannot readlink '%s'", template); + if (sizeof(lnk) <= len) + die("insanely long symlink %s", template); + lnk[len] = 0; + if (symlink(lnk, path)) + die_errno("cannot symlink '%s' '%s'", lnk, path); + } + else if (S_ISREG(st_template.st_mode)) { + if (copy_file(path, template, st_template.st_mode)) + die_errno("cannot copy '%s' to '%s'", template, + path); + } + else + error("ignoring template %s", template); + } +} + +static void copy_templates(const char *template_dir) +{ + char path[PATH_MAX]; + char template_path[PATH_MAX]; + int template_len; + DIR *dir; + const char *git_dir = get_git_dir(); + int len = strlen(git_dir); + + if (!template_dir) + template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT); + if (!template_dir) + template_dir = init_db_template_dir; + if (!template_dir) + template_dir = system_path(DEFAULT_GIT_TEMPLATE_DIR); + if (!template_dir[0]) + return; + template_len = strlen(template_dir); + if (PATH_MAX <= (template_len+strlen("/config"))) + die("insanely long template path %s", template_dir); + strcpy(template_path, template_dir); + if (template_path[template_len-1] != '/') { + template_path[template_len++] = '/'; + template_path[template_len] = 0; + } + dir = opendir(template_path); + if (!dir) { + warning("templates not found %s", template_dir); + return; + } + + /* Make sure that template is from the correct vintage */ + strcpy(template_path + template_len, "config"); + repository_format_version = 0; + git_config_from_file(check_repository_format_version, + template_path, NULL); + template_path[template_len] = 0; + + if (repository_format_version && + repository_format_version != GIT_REPO_VERSION) { + warning("not copying templates of " + "a wrong format version %d from '%s'", + repository_format_version, + template_dir); + closedir(dir); + return; + } + + memcpy(path, git_dir, len); + if (len && path[len - 1] != '/') + path[len++] = '/'; + path[len] = 0; + copy_templates_1(path, len, + template_path, template_len, + dir); + closedir(dir); +} + +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); + + return 0; +} + +static int create_default_files(const char *template_path) +{ + const char *git_dir = get_git_dir(); + unsigned len = strlen(git_dir); + static char path[PATH_MAX]; + struct stat st1; + char repo_version_string[10]; + char junk[2]; + int reinit; + int filemode; + + if (len > sizeof(path)-50) + die("insane git directory %s", git_dir); + memcpy(path, git_dir, len); + + if (len && path[len-1] != '/') + path[len++] = '/'; + + /* + * Create .git/refs/{heads,tags} + */ + safe_create_dir(git_path("refs"), 1); + safe_create_dir(git_path("refs/heads"), 1); + safe_create_dir(git_path("refs/tags"), 1); + + /* Just look for `init.templatedir` */ + 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. + */ + copy_templates(template_path); + + git_config(git_default_config, NULL); + is_bare_repository_cfg = init_is_bare_repository; + + /* reading existing config may have overwrote it */ + if (init_shared_repository != -1) + 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 (shared_repository) { + adjust_shared_perm(get_git_dir()); + adjust_shared_perm(git_path("refs")); + adjust_shared_perm(git_path("refs/heads")); + adjust_shared_perm(git_path("refs/tags")); + } + + /* + * Create the default symlink from ".git/HEAD" to the "master" + * branch, if it does not exist yet. + */ + strcpy(path + len, "HEAD"); + reinit = (!access(path, R_OK) + || readlink(path, junk, sizeof(junk)-1) != -1); + if (!reinit) { + if (create_symref("HEAD", "refs/heads/master", NULL) < 0) + exit(1); + } + + /* This forces creation of new config file */ + sprintf(repo_version_string, "%d", GIT_REPO_VERSION); + git_config_set("core.repositoryformatversion", repo_version_string); + + path[len] = 0; + strcpy(path + len, "config"); + + /* Check filemode trustability */ + 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); + } + 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 == -1) + git_config_set("core.logallrefupdates", "true"); + if (prefixcmp(git_dir, work_tree) || + strcmp(git_dir + strlen(work_tree), "/.git")) { + git_config_set("core.worktree", work_tree); + } + } + + if (!reinit) { + /* Check if symlink is supported in the work tree */ + path[len] = 0; + strcpy(path + len, "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[len] = 0; + strcpy(path + len, "CoNfIg"); + if (!access(path, F_OK)) + git_config_set("core.ignorecase", "true"); + } + + return reinit; +} + +static void create_object_directory(void) +{ + const char *object_directory = get_object_directory(); + int len = strlen(object_directory); + char *path = xmalloc(len + 40); + + memcpy(path, object_directory, len); + + safe_create_dir(object_directory, 1); + strcpy(path+len, "/pack"); + safe_create_dir(path, 1); + strcpy(path+len, "/info"); + safe_create_dir(path, 1); + + free(path); +} + +int init_db(const char *template_dir, unsigned int flags) +{ + int reinit; + + safe_create_dir(get_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(); + + reinit = create_default_files(template_dir); + + create_object_directory(); + + if (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 (shared_repository < 0) + /* force to the mode value */ + sprintf(buf, "0%o", -shared_repository); + else if (shared_repository == PERM_GROUP) + sprintf(buf, "%d", OLD_PERM_GROUP); + else if (shared_repository == PERM_EVERYBODY) + sprintf(buf, "%d", OLD_PERM_EVERYBODY); + else + die("oops"); + git_config_set("core.sharedrepository", buf); + git_config_set("receive.denyNonFastforwards", "true"); + } + + if (!(flags & INIT_DB_QUIET)) { + const char *git_dir = get_git_dir(); + int len = strlen(git_dir); + printf("%s%s Git repository in %s%s\n", + reinit ? "Reinitialized existing" : "Initialized empty", + shared_repository ? " shared" : "", + git_dir, len && git_dir[len-1] != '/' ? "/" : ""); + } + + return 0; +} + +static int guess_repository_type(const char *git_dir) +{ + char cwd[PATH_MAX]; + const char *slash; + + /* + * "GIT_DIR=. git init" is always bare. + * "GIT_DIR=`pwd` git init" too. + */ + if (!strcmp(".", git_dir)) + return 1; + if (!getcwd(cwd, sizeof(cwd))) + die_errno("cannot tell cwd"); + if (!strcmp(git_dir, cwd)) + 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) +{ + *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP; + return 0; +} + +static const char *const init_db_usage[] = { + "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 *work_tree; + const char *template_dir = NULL; + unsigned int flags = 0; + const struct option init_db_options[] = { + OPT_STRING(0, "template", &template_dir, "template-directory", + "provide the directory from which templates will be used"), + OPT_SET_INT(0, "bare", &is_bare_repository_cfg, + "create a bare repository", 1), + { OPTION_CALLBACK, 0, "shared", &init_shared_repository, + "permissions", + "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, "be quiet", INIT_DB_QUIET), + OPT_END() + }; + + argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0); + + 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 = shared_repository; + shared_repository = 0; + switch (safe_create_leading_directories_const(argv[0])) { + case -3: + errno = EEXIST; + /* fallthru */ + case -1: + die_errno("cannot mkdir %s", argv[0]); + break; + default: + break; + } + 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) { + static char git_dir[PATH_MAX+1]; + + setenv(GIT_DIR_ENVIRONMENT, + getcwd(git_dir, sizeof(git_dir)), argc > 0); + } + + if (init_shared_repository != -1) + shared_repository = init_shared_repository; + + /* + * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR + * without --bare. Catch the error early. + */ + git_dir = getenv(GIT_DIR_ENVIRONMENT); + work_tree = 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; + + if (is_bare_repository_cfg < 0) + is_bare_repository_cfg = guess_repository_type(git_dir); + + if (!is_bare_repository_cfg) { + if (git_dir) { + 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 = xstrdup(make_absolute_path(rel)); + free(rel); + } + } + if (!git_work_tree_cfg) { + git_work_tree_cfg = xcalloc(PATH_MAX, 1); + if (!getcwd(git_work_tree_cfg, PATH_MAX)) + die_errno ("Cannot access current working directory"); + } + if (work_tree) + set_git_work_tree(make_absolute_path(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 (work_tree) + set_git_work_tree(make_absolute_path(work_tree)); + } + + set_git_dir(make_absolute_path(git_dir)); + + return init_db(template_dir, flags); +} |