diff options
Diffstat (limited to 'builtin-init-db.c')
| -rw-r--r-- | builtin-init-db.c | 344 |
1 files changed, 344 insertions, 0 deletions
diff --git a/builtin-init-db.c b/builtin-init-db.c new file mode 100644 index 0000000..12e43d0 --- /dev/null +++ b/builtin-init-db.c @@ -0,0 +1,344 @@ +/* + * GIT - The information manager from hell + * + * Copyright (C) Linus Torvalds, 2005 + */ +#include "cache.h" +#include "builtin.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 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\n", dir); +} + +static int copy_file(const char *dst, const char *src, int mode) +{ + int fdi, fdo, status; + + mode = (mode & 0111) ? 0777 : 0666; + if ((fdi = open(src, O_RDONLY)) < 0) + return fdi; + if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) { + close(fdi); + return fdo; + } + status = copy_fd(fdi, fdo); + close(fdo); + + if (!status && adjust_shared_perm(dst)) + return -1; + + return status; +} + +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("cannot stat %s", path); + } + else + exists = 1; + + if (lstat(template, &st_template)) + die("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("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("cannot readlink %s", template); + if (sizeof(lnk) <= len) + die("insanely long symlink %s", template); + lnk[len] = 0; + if (symlink(lnk, path)) + die("cannot symlink %s %s", lnk, path); + } + else if (S_ISREG(st_template.st_mode)) { + if (copy_file(path, template, st_template.st_mode)) + die("cannot copy %s to %s", template, path); + } + else + error("ignoring template %s", template); + } +} + +static void copy_templates(const char *git_dir, int len, const char *template_dir) +{ + char path[PATH_MAX]; + char template_path[PATH_MAX]; + int template_len; + DIR *dir; + + if (!template_dir) { + template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT); + if (!template_dir) + template_dir = DEFAULT_GIT_TEMPLATE_DIR; + } + strcpy(template_path, template_dir); + template_len = strlen(template_path); + if (template_path[template_len-1] != '/') { + template_path[template_len++] = '/'; + template_path[template_len] = 0; + } + dir = opendir(template_path); + if (!dir) { + fprintf(stderr, "warning: templates not found %s\n", + 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); + template_path[template_len] = 0; + + if (repository_format_version && + repository_format_version != GIT_REPO_VERSION) { + fprintf(stderr, "warning: not copying templates of " + "a wrong format version %d from '%s'\n", + repository_format_version, + template_dir); + closedir(dir); + return; + } + + memcpy(path, git_dir, len); + path[len] = 0; + copy_templates_1(path, len, + template_path, template_len, + dir); + closedir(dir); +} + +static int create_default_files(const char *git_dir, const char *template_path) +{ + unsigned len = strlen(git_dir); + static char path[PATH_MAX]; + unsigned char sha1[20]; + struct stat st1; + char repo_version_string[10]; + 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} + */ + strcpy(path + len, "refs"); + safe_create_dir(path, 1); + strcpy(path + len, "refs/heads"); + safe_create_dir(path, 1); + strcpy(path + len, "refs/tags"); + safe_create_dir(path, 1); + + /* First copy the templates -- we might have the default + * config file there, in which case we would want to read + * from it after installing. + */ + path[len] = 0; + copy_templates(path, len, template_path); + + git_config(git_default_config); + + /* + * We would have created the above under user's umask -- under + * shared-repository settings, we would need to fix them up. + */ + if (shared_repository) { + path[len] = 0; + adjust_shared_perm(path); + strcpy(path + len, "refs"); + adjust_shared_perm(path); + strcpy(path + len, "refs/heads"); + adjust_shared_perm(path); + strcpy(path + len, "refs/tags"); + adjust_shared_perm(path); + } + + /* + * Create the default symlink from ".git/HEAD" to the "master" + * branch, if it does not exist yet. + */ + strcpy(path + len, "HEAD"); + reinit = !read_ref("HEAD", sha1); + 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 { + 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"); + } + return reinit; +} + +static const char init_db_usage[] = +"git-init [--template=<template-directory>] [--shared]"; + +/* + * 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 *sha1_dir; + const char *template_dir = NULL; + char *path; + int len, i, reinit; + + for (i = 1; i < argc; i++, argv++) { + const char *arg = argv[1]; + if (!strncmp(arg, "--template=", 11)) + template_dir = arg+11; + else if (!strcmp(arg, "--shared")) + shared_repository = PERM_GROUP; + else if (!strncmp(arg, "--shared=", 9)) + shared_repository = git_config_perm("arg", arg+9); + else + usage(init_db_usage); + } + + /* + * Set up the default .git directory contents + */ + git_dir = getenv(GIT_DIR_ENVIRONMENT); + if (!git_dir) + git_dir = DEFAULT_GIT_DIR_ENVIRONMENT; + safe_create_dir(git_dir, 0); + + /* 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(git_dir, template_dir); + + /* + * And set up the object store. + */ + sha1_dir = get_object_directory(); + len = strlen(sha1_dir); + path = xmalloc(len + 40); + memcpy(path, sha1_dir, len); + + safe_create_dir(sha1_dir, 1); + strcpy(path+len, "/pack"); + safe_create_dir(path, 1); + strcpy(path+len, "/info"); + safe_create_dir(path, 1); + + 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. + */ + sprintf(buf, "%d", shared_repository); + git_config_set("core.sharedrepository", buf); + git_config_set("receive.denyNonFastforwards", "true"); + } + + printf("%s%s Git repository in %s/\n", + reinit ? "Reinitialized existing" : "Initialized empty", + shared_repository ? " shared" : "", + git_dir); + + return 0; +} |