git/builtin-init-db.c
Junio C Hamano d4ebc36c5e Use preprocessor constants for environment variable names.
We broke the discipline Linus set up to allow compiler help us
avoid typos in environment names in the early days of git over
time.  This defines a handful preprocessor constants for
environment variable names used in relatively core parts of the
system.

I've left out variable names specific to subsystems such as HTTP
and SSL as I do not think they are big problems.

Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-12-19 01:51:51 -08:00

332 lines
8.6 KiB
C

/*
* GIT - The information manager from hell
*
* Copyright (C) Linus Torvalds, 2005
*/
#include "cache.h"
#include "builtin.h"
#ifndef DEFAULT_GIT_TEMPLATE_DIR
#define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates/"
#endif
static void safe_create_dir(const char *dir, int share)
{
if (mkdir(dir, 0777) < 0) {
if (errno != EEXIST) {
perror(dir);
exit(1);
}
}
else if (share && adjust_shared_perm(dir))
die("Could not make %s writable by group\n", dir);
}
static int copy_file(const char *dst, const char *src, int mode)
{
int fdi, fdo, status;
mode = (mode & 0111) ? 0777 : 0666;
if ((fdi = open(src, O_RDONLY)) < 0)
return fdi;
if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
close(fdi);
return fdo;
}
status = copy_fd(fdi, fdo);
close(fdo);
if (!status && adjust_shared_perm(dst))
return -1;
return status;
}
static void copy_templates_1(char *path, int baselen,
char *template, int template_baselen,
DIR *dir)
{
struct dirent *de;
/* Note: if ".git/hooks" file exists in the repository being
* re-initialized, /etc/core-git/templates/hooks/update would
* cause git-init-db to fail here. I think this is sane but
* it means that the set of templates we ship by default, along
* with the way the namespace under .git/ is organized, should
* be really carefully chosen.
*/
safe_create_dir(path, 1);
while ((de = readdir(dir)) != NULL) {
struct stat st_git, st_template;
int namelen;
int exists = 0;
if (de->d_name[0] == '.')
continue;
namelen = strlen(de->d_name);
if ((PATH_MAX <= baselen + namelen) ||
(PATH_MAX <= template_baselen + namelen))
die("insanely long template name %s", de->d_name);
memcpy(path + baselen, de->d_name, namelen+1);
memcpy(template + template_baselen, de->d_name, namelen+1);
if (lstat(path, &st_git)) {
if (errno != ENOENT)
die("cannot stat %s", path);
}
else
exists = 1;
if (lstat(template, &st_template))
die("cannot stat template %s", template);
if (S_ISDIR(st_template.st_mode)) {
DIR *subdir = opendir(template);
int baselen_sub = baselen + namelen;
int template_baselen_sub = template_baselen + namelen;
if (!subdir)
die("cannot opendir %s", template);
path[baselen_sub++] =
template[template_baselen_sub++] = '/';
path[baselen_sub] =
template[template_baselen_sub] = 0;
copy_templates_1(path, baselen_sub,
template, template_baselen_sub,
subdir);
closedir(subdir);
}
else if (exists)
continue;
else if (S_ISLNK(st_template.st_mode)) {
char lnk[256];
int len;
len = readlink(template, lnk, sizeof(lnk));
if (len < 0)
die("cannot readlink %s", template);
if (sizeof(lnk) <= len)
die("insanely long symlink %s", template);
lnk[len] = 0;
if (symlink(lnk, path))
die("cannot symlink %s %s", lnk, path);
}
else if (S_ISREG(st_template.st_mode)) {
if (copy_file(path, template, st_template.st_mode))
die("cannot copy %s to %s", template, path);
}
else
error("ignoring template %s", template);
}
}
static void copy_templates(const char *git_dir, int len, const char *template_dir)
{
char path[PATH_MAX];
char template_path[PATH_MAX];
int template_len;
DIR *dir;
if (!template_dir) {
template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
if (!template_dir)
template_dir = DEFAULT_GIT_TEMPLATE_DIR;
}
strcpy(template_path, template_dir);
template_len = strlen(template_path);
if (template_path[template_len-1] != '/') {
template_path[template_len++] = '/';
template_path[template_len] = 0;
}
dir = opendir(template_path);
if (!dir) {
fprintf(stderr, "warning: templates not found %s\n",
template_dir);
return;
}
/* Make sure that template is from the correct vintage */
strcpy(template_path + template_len, "config");
repository_format_version = 0;
git_config_from_file(check_repository_format_version,
template_path);
template_path[template_len] = 0;
if (repository_format_version &&
repository_format_version != GIT_REPO_VERSION) {
fprintf(stderr, "warning: not copying templates of "
"a wrong format version %d from '%s'\n",
repository_format_version,
template_dir);
closedir(dir);
return;
}
memcpy(path, git_dir, len);
path[len] = 0;
copy_templates_1(path, len,
template_path, template_len,
dir);
closedir(dir);
}
static int create_default_files(const char *git_dir, const char *template_path)
{
unsigned len = strlen(git_dir);
static char path[PATH_MAX];
unsigned char sha1[20];
struct stat st1;
char repo_version_string[10];
int reinit;
if (len > sizeof(path)-50)
die("insane git directory %s", git_dir);
memcpy(path, git_dir, len);
if (len && path[len-1] != '/')
path[len++] = '/';
/*
* Create .git/refs/{heads,tags}
*/
strcpy(path + len, "refs");
safe_create_dir(path, 1);
strcpy(path + len, "refs/heads");
safe_create_dir(path, 1);
strcpy(path + len, "refs/tags");
safe_create_dir(path, 1);
/* First copy the templates -- we might have the default
* config file there, in which case we would want to read
* from it after installing.
*/
path[len] = 0;
copy_templates(path, len, template_path);
git_config(git_default_config);
/*
* We would have created the above under user's umask -- under
* shared-repository settings, we would need to fix them up.
*/
if (shared_repository) {
path[len] = 0;
adjust_shared_perm(path);
strcpy(path + len, "refs");
adjust_shared_perm(path);
strcpy(path + len, "refs/heads");
adjust_shared_perm(path);
strcpy(path + len, "refs/tags");
adjust_shared_perm(path);
}
/*
* Create the default symlink from ".git/HEAD" to the "master"
* branch, if it does not exist yet.
*/
strcpy(path + len, "HEAD");
reinit = !read_ref("HEAD", sha1);
if (!reinit) {
if (create_symref("HEAD", "refs/heads/master") < 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 */
if (!lstat(path, &st1)) {
struct stat st2;
int 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");
}
/* Enable logAllRefUpdates if a working tree is attached */
if (!is_bare_git_dir(git_dir))
git_config_set("core.logallrefupdates", "true");
return reinit;
}
static const char init_db_usage[] =
"git-init-db [--template=<template-directory>] [--shared]";
/*
* If you want to, you can share the DB area with any number of branches.
* That has advantages: you can save space by sharing all the SHA1 objects.
* On the other hand, it might just make lookup slower and messier. You
* be the judge. The default case is to have one DB per managed directory.
*/
int cmd_init_db(int argc, const char **argv, const char *prefix)
{
const char *git_dir;
const char *sha1_dir;
const char *template_dir = NULL;
char *path;
int len, i, reinit;
for (i = 1; i < argc; i++, argv++) {
const char *arg = argv[1];
if (!strncmp(arg, "--template=", 11))
template_dir = arg+11;
else if (!strcmp(arg, "--shared"))
shared_repository = PERM_GROUP;
else if (!strncmp(arg, "--shared=", 9))
shared_repository = git_config_perm("arg", arg+9);
else
usage(init_db_usage);
}
/*
* Set up the default .git directory contents
*/
git_dir = getenv(GIT_DIR_ENVIRONMENT);
if (!git_dir)
git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
safe_create_dir(git_dir, 0);
/* Check to see if the repository version is right.
* Note that a newly created repository does not have
* config file, so this will not fail. What we are catching
* is an attempt to reinitialize new repository with an old tool.
*/
check_repository_format();
reinit = create_default_files(git_dir, template_dir);
/*
* And set up the object store.
*/
sha1_dir = get_object_directory();
len = strlen(sha1_dir);
path = xmalloc(len + 40);
memcpy(path, sha1_dir, len);
safe_create_dir(sha1_dir, 1);
strcpy(path+len, "/pack");
safe_create_dir(path, 1);
strcpy(path+len, "/info");
safe_create_dir(path, 1);
if (shared_repository) {
char buf[10];
/* We do not spell "group" and such, so that
* the configuration can be read by older version
* of git.
*/
sprintf(buf, "%d", shared_repository);
git_config_set("core.sharedrepository", buf);
git_config_set("receive.denyNonFastforwards", "true");
}
printf("%s%s Git repository in %s/\n",
reinit ? "Reinitialized existing" : "Initialized empty",
shared_repository ? " shared" : "",
git_dir);
return 0;
}