mirror of
https://github.com/git/git.git
synced 2024-10-29 21:37:53 +01:00
06cbe85503
git init --shared=0xxx, where '0xxx' is an octal number, will create a repository with file modes set to '0xxx'. Users with a safe umask value (0077) can use this option to force file modes. For example, '0640' is a group-readable but not group-writable regardless of user's umask value. Values compatible with old Git versions are written as they were before, for compatibility reasons. That is, "1" for "group" and "2" for "everybody". "git config core.sharedRepository 0xxx" is also handled. Signed-off-by: Heikki Orsila <heikki.orsila@iki.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
424 lines
11 KiB
C
424 lines
11 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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#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 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\n", 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("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("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("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("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("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("cannot copy %s to %s", template, 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 *git_dir, int len, 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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if (!template_dir)
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template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
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if (!template_dir) {
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/*
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* if the hard-coded template is relative, it is
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* interpreted relative to the exec_dir
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*/
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template_dir = DEFAULT_GIT_TEMPLATE_DIR;
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if (!is_absolute_path(template_dir)) {
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struct strbuf d = STRBUF_INIT;
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strbuf_addf(&d, "%s/%s", git_exec_path(), template_dir);
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template_dir = strbuf_detach(&d, NULL);
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}
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}
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strcpy(template_path, template_dir);
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template_len = strlen(template_path);
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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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fprintf(stderr, "warning: templates not found %s\n",
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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);
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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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fprintf(stderr, "warning: not copying templates of "
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"a wrong format version %d from '%s'\n",
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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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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 *git_dir, const char *template_path)
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{
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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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strcpy(path + len, "refs");
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safe_create_dir(path, 1);
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strcpy(path + len, "refs/heads");
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safe_create_dir(path, 1);
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strcpy(path + len, "refs/tags");
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safe_create_dir(path, 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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path[len] = 0;
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copy_templates(path, len, template_path);
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git_config(git_default_config);
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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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path[len] = 0;
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adjust_shared_perm(path);
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strcpy(path + len, "refs");
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adjust_shared_perm(path);
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strcpy(path + len, "refs/heads");
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adjust_shared_perm(path);
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strcpy(path + len, "refs/tags");
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adjust_shared_perm(path);
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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 (work_tree != git_work_tree_cfg)
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git_config_set("core.worktree", work_tree);
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}
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/* Check if symlink is supported in the work tree */
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if (!reinit) {
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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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}
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return reinit;
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}
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static void 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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if (0 <= is_bare_repository_cfg)
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return;
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if (!git_dir)
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return;
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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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goto force_bare;
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if (!getcwd(cwd, sizeof(cwd)))
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die("cannot tell cwd");
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if (!strcmp(git_dir, cwd))
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goto force_bare;
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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;
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slash = strrchr(git_dir, '/');
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if (slash && !strcmp(slash, "/.git"))
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return;
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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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force_bare:
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is_bare_repository_cfg = 1;
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return;
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}
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static const char init_db_usage[] =
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"git-init [-q | --quiet] [--template=<template-directory>] [--shared]";
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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 *sha1_dir;
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const char *template_dir = NULL;
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char *path;
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int len, i, reinit;
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int quiet = 0;
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for (i = 1; i < argc; i++, argv++) {
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const char *arg = argv[1];
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if (!prefixcmp(arg, "--template="))
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template_dir = arg+11;
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else if (!strcmp(arg, "--shared"))
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shared_repository = PERM_GROUP;
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else if (!prefixcmp(arg, "--shared="))
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shared_repository = git_config_perm("arg", arg+9);
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else if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet"))
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quiet = 1;
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else
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usage(init_db_usage);
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}
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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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guess_repository_type(git_dir);
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if (is_bare_repository_cfg <= 0) {
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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 ("Cannot access current working directory.");
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if (access(get_git_work_tree(), X_OK))
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die ("Cannot access work tree '%s'",
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get_git_work_tree());
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}
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/*
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* Set up the default .git directory contents
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*/
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git_dir = getenv(GIT_DIR_ENVIRONMENT);
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if (!git_dir)
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git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
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safe_create_dir(git_dir, 0);
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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(git_dir, template_dir);
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/*
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* And set up the object store.
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*/
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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 == 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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sprintf(buf, "0%o", shared_repository);
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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 (!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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git_dir);
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return 0;
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}
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