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![Shawn O. Pearce](/assets/img/avatar_default.png)
Back in the old days of Git when people messed around with their GIT_DIR environment variable more often it was nice to know whether or not git-init-db created a .git directory or used GIT_DIR. As most users at that time were rather technical UNIXy folk the message "defaulting to local storage area" made sense to some and seemed reasonable. But it doesn't really convey any meaning to the new Git user, as they don't know what a 'local storage area is' nor do they know enough about Git to care. It also really doesn't tell the experienced Git user a whole lot about the command they just ran, especially if they might be reinitializing an existing repository (e.g. to update hooks). So now we print out what we did ("Initialized empty" or "Reinitialized existing"), what type of repository ("" or "shared"), and what location the repository will be in ("$GIT_DIR"). Suggested in part by Andy Parkins in his Git 'niggles' list (<200612132237.10051.andyparkins@gmail.com>). Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
326 lines
8.3 KiB
C
326 lines
8.3 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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#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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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 int copy_file(const char *dst, const char *src, int mode)
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{
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int fdi, fdo, status;
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mode = (mode & 0111) ? 0777 : 0666;
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if ((fdi = open(src, O_RDONLY)) < 0)
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return fdi;
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if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
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close(fdi);
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return fdo;
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}
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status = copy_fd(fdi, fdo);
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close(fdo);
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if (!status && adjust_shared_perm(dst))
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return -1;
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return status;
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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-db 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 = DEFAULT_GIT_TEMPLATE_DIR;
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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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unsigned char sha1[20];
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struct stat st1;
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char repo_version_string[10];
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int reinit;
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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 = !read_ref("HEAD", sha1);
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if (!reinit) {
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if (create_symref("HEAD", "refs/heads/master") < 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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if (!lstat(path, &st1)) {
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struct stat st2;
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int 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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git_config_set("core.filemode",
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filemode ? "true" : "false");
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}
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return reinit;
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}
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static const char init_db_usage[] =
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"git-init-db [--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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for (i = 1; i < argc; i++, argv++) {
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const char *arg = argv[1];
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if (!strncmp(arg, "--template=", 11))
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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 (!strncmp(arg, "--shared=", 9))
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shared_repository = git_config_perm("arg", arg+9);
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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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* 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.
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*/
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sprintf(buf, "%d", 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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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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