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/*
* GIT - The information manager from hell
*
* Copyright (C) Linus Torvalds, 2005
*/
#include "cache.h"
#include "builtin.h"
#include "exec_cmd.h"

#ifndef DEFAULT_GIT_TEMPLATE_DIR
#define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates"
#endif

#ifdef NO_TRUSTABLE_FILEMODE
#define TEST_FILEMODE 0
#else
#define TEST_FILEMODE 1
#endif

static int init_is_bare_repository = 0;
static int init_shared_repository = -1;

static void safe_create_dir(const char *dir, int share)
{
if (mkdir(dir, 0777) < 0) {
if (errno != EEXIST) {
perror(dir);
exit(1);
}
}
else if (share && adjust_shared_perm(dir))
die("Could not make %s writable by group", dir);
}

static void copy_templates_1(char *path, int baselen,
char *template, int template_baselen,
DIR *dir)
{
struct dirent *de;

/* Note: if ".git/hooks" file exists in the repository being
* re-initialized, /etc/core-git/templates/hooks/update would
* cause "git init" to fail here. I think this is sane but
* it means that the set of templates we ship by default, along
* with the way the namespace under .git/ is organized, should
* be really carefully chosen.
*/
safe_create_dir(path, 1);
while ((de = readdir(dir)) != NULL) {
struct stat st_git, st_template;
int namelen;
int exists = 0;

if (de->d_name[0] == '.')
continue;
namelen = strlen(de->d_name);
if ((PATH_MAX <= baselen + namelen) ||
(PATH_MAX <= template_baselen + namelen))
die("insanely long template name %s", de->d_name);
memcpy(path + baselen, de->d_name, namelen+1);
memcpy(template + template_baselen, de->d_name, namelen+1);
if (lstat(path, &st_git)) {
if (errno != ENOENT)
die("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 *template_dir)
{
char path[PATH_MAX];
char template_path[PATH_MAX];
int template_len;
DIR *dir;
const char *git_dir = get_git_dir();
int len = strlen(git_dir);

if (!template_dir)
template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
if (!template_dir)
template_dir = system_path(DEFAULT_GIT_TEMPLATE_DIR);
if (!template_dir[0])
return;
template_len = strlen(template_dir);
if (PATH_MAX <= (template_len+strlen("/config")))
die("insanely long template path %s", template_dir);
strcpy(template_path, template_dir);
if (template_path[template_len-1] != '/') {
template_path[template_len++] = '/';
template_path[template_len] = 0;
}
dir = opendir(template_path);
if (!dir) {
warning("templates not found %s", template_dir);
return;
}

/* Make sure that template is from the correct vintage */
strcpy(template_path + template_len, "config");
repository_format_version = 0;
git_config_from_file(check_repository_format_version,
template_path, NULL);
template_path[template_len] = 0;

if (repository_format_version &&
repository_format_version != GIT_REPO_VERSION) {
warning("not copying templates of "
"a wrong format version %d from '%s'",
repository_format_version,
template_dir);
closedir(dir);
return;
}

memcpy(path, git_dir, len);
if (len && path[len - 1] != '/')
path[len++] = '/';
path[len] = 0;
copy_templates_1(path, len,
template_path, template_len,
dir);
closedir(dir);
}

static int create_default_files(const char *template_path)
{
const char *git_dir = get_git_dir();
unsigned len = strlen(git_dir);
static char path[PATH_MAX];
struct stat st1;
char repo_version_string[10];
char junk[2];
int reinit;
int filemode;

if (len > sizeof(path)-50)
die("insane git directory %s", git_dir);
memcpy(path, git_dir, len);

if (len && path[len-1] != '/')
path[len++] = '/';

/*
* Create .git/refs/{heads,tags}
*/
safe_create_dir(git_path("refs"), 1);
safe_create_dir(git_path("refs/heads"), 1);
safe_create_dir(git_path("refs/tags"), 1);

/* First copy the templates -- we might have the default
* config file there, in which case we would want to read
* from it after installing.
*/
copy_templates(template_path);

git_config(git_default_config, NULL);
is_bare_repository_cfg = init_is_bare_repository;

/* reading existing config may have overwrote it */
if (init_shared_repository != -1)
shared_repository = init_shared_repository;

/*
* We would have created the above under user's umask -- under
* shared-repository settings, we would need to fix them up.
*/
if (shared_repository) {
adjust_shared_perm(get_git_dir());
adjust_shared_perm(git_path("refs"));
adjust_shared_perm(git_path("refs/heads"));
adjust_shared_perm(git_path("refs/tags"));
}

/*
* Create the default symlink from ".git/HEAD" to the "master"
* branch, if it does not exist yet.
*/
strcpy(path + len, "HEAD");
reinit = (!access(path, R_OK)
|| readlink(path, junk, sizeof(junk)-1) != -1);
if (!reinit) {
if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
exit(1);
}

/* This forces creation of new config file */
sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
git_config_set("core.repositoryformatversion", repo_version_string);

path[len] = 0;
strcpy(path + len, "config");

/* Check filemode trustability */
filemode = TEST_FILEMODE;
if (TEST_FILEMODE && !lstat(path, &st1)) {
struct stat st2;
filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
!lstat(path, &st2) &&
st1.st_mode != st2.st_mode);
}
git_config_set("core.filemode", filemode ? "true" : "false");

if (is_bare_repository())
git_config_set("core.bare", "true");
else {
const char *work_tree = get_git_work_tree();
git_config_set("core.bare", "false");
/* allow template config file to override the default */
if (log_all_ref_updates == -1)
git_config_set("core.logallrefupdates", "true");
if (prefixcmp(git_dir, work_tree) ||
strcmp(git_dir + strlen(work_tree), "/.git")) {
git_config_set("core.worktree", work_tree);
}
}

if (!reinit) {
/* Check if symlink is supported in the work tree */
path[len] = 0;
strcpy(path + len, "tXXXXXX");
if (!close(xmkstemp(path)) &&
!unlink(path) &&
!symlink("testing", path) &&
!lstat(path, &st1) &&
S_ISLNK(st1.st_mode))
unlink(path); /* good */
else
git_config_set("core.symlinks", "false");

/* Check if the filesystem is case-insensitive */
path[len] = 0;
strcpy(path + len, "CoNfIg");
if (!access(path, F_OK))
git_config_set("core.ignorecase", "true");
}

return reinit;
}

int init_db(const char *template_dir, unsigned int flags)
{
const char *sha1_dir;
char *path;
int len, reinit;

safe_create_dir(get_git_dir(), 0);

init_is_bare_repository = is_bare_repository();

/* Check to see if the repository version is right.
* Note that a newly created repository does not have
* config file, so this will not fail. What we are catching
* is an attempt to reinitialize new repository with an old tool.
*/
check_repository_format();

reinit = create_default_files(template_dir);

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. Note, we use octal numbers for new share modes,
* and compatibility values for PERM_GROUP and
* PERM_EVERYBODY.
*/
if (shared_repository < 0)
/* force to the mode value */
sprintf(buf, "0%o", -shared_repository);
else if (shared_repository == PERM_GROUP)
sprintf(buf, "%d", OLD_PERM_GROUP);
else if (shared_repository == PERM_EVERYBODY)
sprintf(buf, "%d", OLD_PERM_EVERYBODY);
else
die("oops");
git_config_set("core.sharedrepository", buf);
git_config_set("receive.denyNonFastforwards", "true");
}

if (!(flags & INIT_DB_QUIET))
printf("%s%s Git repository in %s/\n",
reinit ? "Reinitialized existing" : "Initialized empty",
shared_repository ? " shared" : "",
get_git_dir());

return 0;
}

static int guess_repository_type(const char *git_dir)
{
char cwd[PATH_MAX];
const char *slash;

/*
* "GIT_DIR=. git init" is always bare.
* "GIT_DIR=`pwd` git init" too.
*/
if (!strcmp(".", git_dir))
return 1;
if (!getcwd(cwd, sizeof(cwd)))
die("cannot tell cwd");
if (!strcmp(git_dir, cwd))
return 1;
/*
* "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
*/
if (!strcmp(git_dir, ".git"))
return 0;
slash = strrchr(git_dir, '/');
if (slash && !strcmp(slash, "/.git"))
return 0;

/*
* Otherwise it is often bare. At this point
* we are just guessing.
*/
return 1;
}

static const char init_db_usage[] =
"git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]]";

/*
* 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 *template_dir = NULL;
unsigned int flags = 0;
int i;

for (i = 1; i < argc; i++, argv++) {
const char *arg = argv[1];
if (!prefixcmp(arg, "--template="))
template_dir = arg+11;
else if (!strcmp(arg, "--bare")) {
static char git_dir[PATH_MAX+1];
is_bare_repository_cfg = 1;
setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir,
sizeof(git_dir)), 0);
} else if (!strcmp(arg, "--shared"))
init_shared_repository = PERM_GROUP;
else if (!prefixcmp(arg, "--shared="))
init_shared_repository = git_config_perm("arg", arg+9);
else if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet"))
flags |= INIT_DB_QUIET;
else
usage(init_db_usage);
}

if (init_shared_repository != -1)
shared_repository = init_shared_repository;

/*
* GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
* without --bare. Catch the error early.
*/
git_dir = getenv(GIT_DIR_ENVIRONMENT);
if ((!git_dir || is_bare_repository_cfg == 1)
&& getenv(GIT_WORK_TREE_ENVIRONMENT))
die("%s (or --work-tree=<directory>) not allowed without "
"specifying %s (or --git-dir=<directory>)",
GIT_WORK_TREE_ENVIRONMENT,
GIT_DIR_ENVIRONMENT);

/*
* Set up the default .git directory contents
*/
if (!git_dir)
git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;

if (is_bare_repository_cfg < 0)
is_bare_repository_cfg = guess_repository_type(git_dir);

if (!is_bare_repository_cfg) {
if (git_dir) {
const char *git_dir_parent = strrchr(git_dir, '/');
if (git_dir_parent) {
char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
git_work_tree_cfg = xstrdup(make_absolute_path(rel));
free(rel);
}
}
if (!git_work_tree_cfg) {
git_work_tree_cfg = xcalloc(PATH_MAX, 1);
if (!getcwd(git_work_tree_cfg, PATH_MAX))
die ("Cannot access current working directory.");
}
if (access(get_git_work_tree(), X_OK))
die ("Cannot access work tree '%s'",
get_git_work_tree());
}

set_git_dir(make_absolute_path(git_dir));

return init_db(template_dir, flags);
}
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