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![Junio C Hamano](/assets/img/avatar_default.png)
* ns/init-mkdir: git init: optionally allow a directory argument Conflicts: builtin-init-db.c
499 lines
13 KiB
C
499 lines
13 KiB
C
/*
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* GIT - The information manager from hell
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*
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* Copyright (C) Linus Torvalds, 2005
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*/
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#include "cache.h"
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#include "builtin.h"
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#include "exec_cmd.h"
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#include "parse-options.h"
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#ifndef DEFAULT_GIT_TEMPLATE_DIR
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#define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates"
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#endif
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#ifdef NO_TRUSTABLE_FILEMODE
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#define TEST_FILEMODE 0
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#else
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#define TEST_FILEMODE 1
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#endif
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static int init_is_bare_repository = 0;
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static int init_shared_repository = -1;
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static void safe_create_dir(const char *dir, int share)
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{
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if (mkdir(dir, 0777) < 0) {
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if (errno != EEXIST) {
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perror(dir);
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exit(1);
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}
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}
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else if (share && adjust_shared_perm(dir))
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die("Could not make %s writable by group", dir);
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}
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static void copy_templates_1(char *path, int baselen,
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char *template, int template_baselen,
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DIR *dir)
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{
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struct dirent *de;
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/* Note: if ".git/hooks" file exists in the repository being
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* re-initialized, /etc/core-git/templates/hooks/update would
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* cause "git init" to fail here. I think this is sane but
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* it means that the set of templates we ship by default, along
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* with the way the namespace under .git/ is organized, should
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* be really carefully chosen.
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*/
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safe_create_dir(path, 1);
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while ((de = readdir(dir)) != NULL) {
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struct stat st_git, st_template;
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int namelen;
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int exists = 0;
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if (de->d_name[0] == '.')
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continue;
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namelen = strlen(de->d_name);
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if ((PATH_MAX <= baselen + namelen) ||
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(PATH_MAX <= template_baselen + namelen))
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die("insanely long template name %s", de->d_name);
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memcpy(path + baselen, de->d_name, namelen+1);
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memcpy(template + template_baselen, de->d_name, namelen+1);
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if (lstat(path, &st_git)) {
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if (errno != ENOENT)
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die_errno("cannot stat '%s'", path);
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}
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else
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exists = 1;
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if (lstat(template, &st_template))
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die_errno("cannot stat template '%s'", template);
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if (S_ISDIR(st_template.st_mode)) {
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DIR *subdir = opendir(template);
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int baselen_sub = baselen + namelen;
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int template_baselen_sub = template_baselen + namelen;
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if (!subdir)
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die_errno("cannot opendir '%s'", template);
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path[baselen_sub++] =
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template[template_baselen_sub++] = '/';
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path[baselen_sub] =
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template[template_baselen_sub] = 0;
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copy_templates_1(path, baselen_sub,
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template, template_baselen_sub,
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subdir);
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closedir(subdir);
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}
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else if (exists)
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continue;
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else if (S_ISLNK(st_template.st_mode)) {
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char lnk[256];
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int len;
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len = readlink(template, lnk, sizeof(lnk));
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if (len < 0)
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die_errno("cannot readlink '%s'", template);
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if (sizeof(lnk) <= len)
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die("insanely long symlink %s", template);
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lnk[len] = 0;
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if (symlink(lnk, path))
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die_errno("cannot symlink '%s' '%s'", lnk, path);
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}
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else if (S_ISREG(st_template.st_mode)) {
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if (copy_file(path, template, st_template.st_mode))
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die_errno("cannot copy '%s' to '%s'", template,
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path);
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}
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else
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error("ignoring template %s", template);
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}
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}
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static void copy_templates(const char *template_dir)
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{
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char path[PATH_MAX];
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char template_path[PATH_MAX];
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int template_len;
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DIR *dir;
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const char *git_dir = get_git_dir();
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int len = strlen(git_dir);
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if (!template_dir)
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template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
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if (!template_dir)
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template_dir = system_path(DEFAULT_GIT_TEMPLATE_DIR);
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if (!template_dir[0])
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return;
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template_len = strlen(template_dir);
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if (PATH_MAX <= (template_len+strlen("/config")))
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die("insanely long template path %s", template_dir);
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strcpy(template_path, template_dir);
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if (template_path[template_len-1] != '/') {
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template_path[template_len++] = '/';
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template_path[template_len] = 0;
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}
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dir = opendir(template_path);
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if (!dir) {
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warning("templates not found %s", template_dir);
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return;
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}
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/* Make sure that template is from the correct vintage */
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strcpy(template_path + template_len, "config");
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repository_format_version = 0;
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git_config_from_file(check_repository_format_version,
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template_path, NULL);
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template_path[template_len] = 0;
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if (repository_format_version &&
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repository_format_version != GIT_REPO_VERSION) {
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warning("not copying templates of "
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"a wrong format version %d from '%s'",
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repository_format_version,
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template_dir);
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closedir(dir);
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return;
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}
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memcpy(path, git_dir, len);
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if (len && path[len - 1] != '/')
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path[len++] = '/';
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path[len] = 0;
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copy_templates_1(path, len,
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template_path, template_len,
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dir);
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closedir(dir);
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}
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static int create_default_files(const char *template_path)
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{
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const char *git_dir = get_git_dir();
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unsigned len = strlen(git_dir);
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static char path[PATH_MAX];
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struct stat st1;
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char repo_version_string[10];
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char junk[2];
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int reinit;
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int filemode;
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if (len > sizeof(path)-50)
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die("insane git directory %s", git_dir);
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memcpy(path, git_dir, len);
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if (len && path[len-1] != '/')
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path[len++] = '/';
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/*
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* Create .git/refs/{heads,tags}
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*/
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safe_create_dir(git_path("refs"), 1);
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safe_create_dir(git_path("refs/heads"), 1);
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safe_create_dir(git_path("refs/tags"), 1);
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/* First copy the templates -- we might have the default
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* config file there, in which case we would want to read
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* from it after installing.
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*/
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copy_templates(template_path);
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git_config(git_default_config, NULL);
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is_bare_repository_cfg = init_is_bare_repository;
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/* reading existing config may have overwrote it */
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if (init_shared_repository != -1)
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shared_repository = init_shared_repository;
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/*
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* We would have created the above under user's umask -- under
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* shared-repository settings, we would need to fix them up.
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*/
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if (shared_repository) {
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adjust_shared_perm(get_git_dir());
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adjust_shared_perm(git_path("refs"));
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adjust_shared_perm(git_path("refs/heads"));
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adjust_shared_perm(git_path("refs/tags"));
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}
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/*
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* Create the default symlink from ".git/HEAD" to the "master"
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* branch, if it does not exist yet.
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*/
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strcpy(path + len, "HEAD");
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reinit = (!access(path, R_OK)
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|| readlink(path, junk, sizeof(junk)-1) != -1);
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if (!reinit) {
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if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
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exit(1);
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}
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/* This forces creation of new config file */
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sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
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git_config_set("core.repositoryformatversion", repo_version_string);
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path[len] = 0;
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strcpy(path + len, "config");
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/* Check filemode trustability */
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filemode = TEST_FILEMODE;
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if (TEST_FILEMODE && !lstat(path, &st1)) {
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struct stat st2;
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filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
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!lstat(path, &st2) &&
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st1.st_mode != st2.st_mode);
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}
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git_config_set("core.filemode", filemode ? "true" : "false");
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if (is_bare_repository())
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git_config_set("core.bare", "true");
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else {
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const char *work_tree = get_git_work_tree();
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git_config_set("core.bare", "false");
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/* allow template config file to override the default */
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if (log_all_ref_updates == -1)
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git_config_set("core.logallrefupdates", "true");
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if (prefixcmp(git_dir, work_tree) ||
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strcmp(git_dir + strlen(work_tree), "/.git")) {
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git_config_set("core.worktree", work_tree);
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}
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}
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if (!reinit) {
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/* Check if symlink is supported in the work tree */
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path[len] = 0;
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strcpy(path + len, "tXXXXXX");
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if (!close(xmkstemp(path)) &&
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!unlink(path) &&
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!symlink("testing", path) &&
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!lstat(path, &st1) &&
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S_ISLNK(st1.st_mode))
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unlink(path); /* good */
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else
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git_config_set("core.symlinks", "false");
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/* Check if the filesystem is case-insensitive */
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path[len] = 0;
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strcpy(path + len, "CoNfIg");
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if (!access(path, F_OK))
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git_config_set("core.ignorecase", "true");
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}
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return reinit;
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}
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int init_db(const char *template_dir, unsigned int flags)
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{
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const char *sha1_dir;
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char *path;
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int len, reinit;
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safe_create_dir(get_git_dir(), 0);
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init_is_bare_repository = is_bare_repository();
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/* Check to see if the repository version is right.
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* Note that a newly created repository does not have
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* config file, so this will not fail. What we are catching
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* is an attempt to reinitialize new repository with an old tool.
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*/
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check_repository_format();
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reinit = create_default_files(template_dir);
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sha1_dir = get_object_directory();
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len = strlen(sha1_dir);
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path = xmalloc(len + 40);
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memcpy(path, sha1_dir, len);
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safe_create_dir(sha1_dir, 1);
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strcpy(path+len, "/pack");
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safe_create_dir(path, 1);
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strcpy(path+len, "/info");
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safe_create_dir(path, 1);
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if (shared_repository) {
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char buf[10];
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/* We do not spell "group" and such, so that
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* the configuration can be read by older version
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* of git. Note, we use octal numbers for new share modes,
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* and compatibility values for PERM_GROUP and
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* PERM_EVERYBODY.
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*/
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if (shared_repository < 0)
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/* force to the mode value */
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sprintf(buf, "0%o", -shared_repository);
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else if (shared_repository == PERM_GROUP)
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sprintf(buf, "%d", OLD_PERM_GROUP);
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else if (shared_repository == PERM_EVERYBODY)
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sprintf(buf, "%d", OLD_PERM_EVERYBODY);
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else
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die("oops");
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git_config_set("core.sharedrepository", buf);
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git_config_set("receive.denyNonFastforwards", "true");
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}
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if (!(flags & INIT_DB_QUIET))
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printf("%s%s Git repository in %s/\n",
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reinit ? "Reinitialized existing" : "Initialized empty",
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shared_repository ? " shared" : "",
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get_git_dir());
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return 0;
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}
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static int guess_repository_type(const char *git_dir)
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{
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char cwd[PATH_MAX];
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const char *slash;
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/*
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* "GIT_DIR=. git init" is always bare.
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* "GIT_DIR=`pwd` git init" too.
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*/
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if (!strcmp(".", git_dir))
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return 1;
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if (!getcwd(cwd, sizeof(cwd)))
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die_errno("cannot tell cwd");
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if (!strcmp(git_dir, cwd))
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return 1;
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/*
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* "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
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*/
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if (!strcmp(git_dir, ".git"))
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return 0;
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slash = strrchr(git_dir, '/');
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if (slash && !strcmp(slash, "/.git"))
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return 0;
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/*
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* Otherwise it is often bare. At this point
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* we are just guessing.
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*/
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return 1;
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}
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static int shared_callback(const struct option *opt, const char *arg, int unset)
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{
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*((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
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return 0;
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}
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static const char *const init_db_usage[] = {
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"git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [directory]",
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NULL
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};
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/*
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* If you want to, you can share the DB area with any number of branches.
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* That has advantages: you can save space by sharing all the SHA1 objects.
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* On the other hand, it might just make lookup slower and messier. You
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* be the judge. The default case is to have one DB per managed directory.
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*/
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int cmd_init_db(int argc, const char **argv, const char *prefix)
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{
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const char *git_dir;
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const char *template_dir = NULL;
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unsigned int flags = 0;
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const struct option init_db_options[] = {
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OPT_STRING(0, "template", &template_dir, "template-directory",
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"provide the directory from which templates will be used"),
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OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
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"create a bare repository", 1),
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{ OPTION_CALLBACK, 0, "shared", &init_shared_repository,
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"permissions",
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"specify that the git repository is to be shared amongst several users",
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PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
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OPT_BIT('q', "quiet", &flags, "be quiet", INIT_DB_QUIET),
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OPT_END()
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};
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argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
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if (argc == 1) {
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int mkdir_tried = 0;
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retry:
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if (chdir(argv[0]) < 0) {
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if (!mkdir_tried) {
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int saved;
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/*
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* At this point we haven't read any configuration,
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* and we know shared_repository should always be 0;
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* but just in case we play safe.
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*/
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saved = shared_repository;
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shared_repository = 0;
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switch (safe_create_leading_directories_const(argv[0])) {
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case -3:
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errno = EEXIST;
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/* fallthru */
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case -1:
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die_errno("cannot mkdir %s", argv[0]);
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break;
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default:
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break;
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}
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shared_repository = saved;
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if (mkdir(argv[0], 0777) < 0)
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die_errno("cannot mkdir %s", argv[0]);
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mkdir_tried = 1;
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goto retry;
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}
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die_errno("cannot chdir to %s", argv[0]);
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}
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} else if (0 < argc) {
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usage(init_db_usage[0]);
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}
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if (is_bare_repository_cfg == 1) {
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static char git_dir[PATH_MAX+1];
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setenv(GIT_DIR_ENVIRONMENT,
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getcwd(git_dir, sizeof(git_dir)), 0);
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}
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if (init_shared_repository != -1)
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shared_repository = init_shared_repository;
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/*
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* GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
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* without --bare. Catch the error early.
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*/
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git_dir = getenv(GIT_DIR_ENVIRONMENT);
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if ((!git_dir || is_bare_repository_cfg == 1)
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&& getenv(GIT_WORK_TREE_ENVIRONMENT))
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die("%s (or --work-tree=<directory>) not allowed without "
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"specifying %s (or --git-dir=<directory>)",
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GIT_WORK_TREE_ENVIRONMENT,
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GIT_DIR_ENVIRONMENT);
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/*
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* Set up the default .git directory contents
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*/
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if (!git_dir)
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git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
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if (is_bare_repository_cfg < 0)
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is_bare_repository_cfg = guess_repository_type(git_dir);
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if (!is_bare_repository_cfg) {
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if (git_dir) {
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const char *git_dir_parent = strrchr(git_dir, '/');
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if (git_dir_parent) {
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char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
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git_work_tree_cfg = xstrdup(make_absolute_path(rel));
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free(rel);
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}
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}
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if (!git_work_tree_cfg) {
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git_work_tree_cfg = xcalloc(PATH_MAX, 1);
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if (!getcwd(git_work_tree_cfg, PATH_MAX))
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die_errno ("Cannot access current working directory");
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}
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if (access(get_git_work_tree(), X_OK))
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die_errno ("Cannot access work tree '%s'",
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get_git_work_tree());
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}
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set_git_dir(make_absolute_path(git_dir));
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return init_db(template_dir, flags);
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}
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