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git/builtin/init-db.c

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/*
* GIT - The information manager from hell
*
* Copyright (C) Linus Torvalds, 2005
*/
#include "cache.h"
#include "refs.h"
#include "builtin.h"
#include "exec_cmd.h"
#include "parse-options.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 const char *init_db_template_dir;
static const char *git_link;
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_errno(_("cannot stat '%s'"), path);
}
else
exists = 1;
if (lstat(template, &st_template))
die_errno(_("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_errno(_("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_errno(_("cannot readlink '%s'"), template);
if (sizeof(lnk) <= len)
die(_("insanely long symlink %s"), template);
lnk[len] = 0;
if (symlink(lnk, path))
die_errno(_("cannot symlink '%s' '%s'"), lnk, path);
}
else if (S_ISREG(st_template.st_mode)) {
if (copy_file(path, template, st_template.st_mode))
die_errno(_("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);
char *to_free = NULL;
if (!template_dir)
template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
if (!template_dir)
template_dir = init_db_template_dir;
if (!template_dir)
template_dir = to_free = system_path(DEFAULT_GIT_TEMPLATE_DIR);
if (!template_dir[0]) {
free(to_free);
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);
goto free_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);
goto close_free_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);
close_free_return:
closedir(dir);
free_return:
free(to_free);
}
static int git_init_db_config(const char *k, const char *v, void *cb)
{
if (!strcmp(k, "init.templatedir"))
return git_config_pathname(&init_db_template_dir, k, v);
return 0;
}
/*
* If the git_dir is not directly inside the working tree, then git will not
* find it by default, and we need to set the worktree explicitly.
*/
static int needs_work_tree_config(const char *git_dir, const char *work_tree)
{
if (!strcmp(work_tree, "/") && !strcmp(git_dir, "/.git"))
return 0;
if (skip_prefix(git_dir, work_tree, &git_dir) &&
!strcmp(git_dir, "/.git"))
return 0;
return 1;
}
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);
/* Just look for `init.templatedir` */
git_config(git_init_db_config, NULL);
/* 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 */
xsnprintf(repo_version_string, sizeof(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 &&
!chmod(path, st1.st_mode));
if (filemode && !reinit && (st1.st_mode & S_IXUSR))
filemode = 0;
}
git_config_set("core.filemode", filemode ? "true" : "false");
Clean up work-tree handling The old version of work-tree support was an unholy mess, barely readable, and not to the point. For example, why do you have to provide a worktree, when it is not used? As in "git status". Now it works. Another riddle was: if you can have work trees inside the git dir, why are some programs complaining that they need a work tree? IOW it is allowed to call $ git --git-dir=../ --work-tree=. bla when you really want to. In this case, you are both in the git directory and in the working tree. So, programs have to actually test for the right thing, namely if they are inside a working tree, and not if they are inside a git directory. Also, GIT_DIR=../.git should behave the same as if no GIT_DIR was specified, unless there is a repository in the current working directory. It does now. The logic to determine if a repository is bare, or has a work tree (tertium non datur), is this: --work-tree=bla overrides GIT_WORK_TREE, which overrides core.bare = true, which overrides core.worktree, which overrides GIT_DIR/.. when GIT_DIR ends in /.git, which overrides the directory in which .git/ was found. In related news, a long standing bug was fixed: when in .git/bla/x.git/, which is a bare repository, git formerly assumed ../.. to be the appropriate git dir. This problem was reported by Shawn Pearce to have caused much pain, where a colleague mistakenly ran "git init" in "/" a long time ago, and bare repositories just would not work. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-08-01 02:30:14 +02:00
if (is_bare_repository())
git_config_set("core.bare", "true");
else {
Clean up work-tree handling The old version of work-tree support was an unholy mess, barely readable, and not to the point. For example, why do you have to provide a worktree, when it is not used? As in "git status". Now it works. Another riddle was: if you can have work trees inside the git dir, why are some programs complaining that they need a work tree? IOW it is allowed to call $ git --git-dir=../ --work-tree=. bla when you really want to. In this case, you are both in the git directory and in the working tree. So, programs have to actually test for the right thing, namely if they are inside a working tree, and not if they are inside a git directory. Also, GIT_DIR=../.git should behave the same as if no GIT_DIR was specified, unless there is a repository in the current working directory. It does now. The logic to determine if a repository is bare, or has a work tree (tertium non datur), is this: --work-tree=bla overrides GIT_WORK_TREE, which overrides core.bare = true, which overrides core.worktree, which overrides GIT_DIR/.. when GIT_DIR ends in /.git, which overrides the directory in which .git/ was found. In related news, a long standing bug was fixed: when in .git/bla/x.git/, which is a bare repository, git formerly assumed ../.. to be the appropriate git dir. This problem was reported by Shawn Pearce to have caused much pain, where a colleague mistakenly ran "git init" in "/" a long time ago, and bare repositories just would not work. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-08-01 02:30:14 +02:00
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 (needs_work_tree_config(git_dir, work_tree))
Clean up work-tree handling The old version of work-tree support was an unholy mess, barely readable, and not to the point. For example, why do you have to provide a worktree, when it is not used? As in "git status". Now it works. Another riddle was: if you can have work trees inside the git dir, why are some programs complaining that they need a work tree? IOW it is allowed to call $ git --git-dir=../ --work-tree=. bla when you really want to. In this case, you are both in the git directory and in the working tree. So, programs have to actually test for the right thing, namely if they are inside a working tree, and not if they are inside a git directory. Also, GIT_DIR=../.git should behave the same as if no GIT_DIR was specified, unless there is a repository in the current working directory. It does now. The logic to determine if a repository is bare, or has a work tree (tertium non datur), is this: --work-tree=bla overrides GIT_WORK_TREE, which overrides core.bare = true, which overrides core.worktree, which overrides GIT_DIR/.. when GIT_DIR ends in /.git, which overrides the directory in which .git/ was found. In related news, a long standing bug was fixed: when in .git/bla/x.git/, which is a bare repository, git formerly assumed ../.. to be the appropriate git dir. This problem was reported by Shawn Pearce to have caused much pain, where a colleague mistakenly ran "git init" in "/" a long time ago, and bare repositories just would not work. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-08-01 02:30:14 +02:00
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");
git on Mac OS and precomposed unicode Mac OS X mangles file names containing unicode on file systems HFS+, VFAT or SAMBA. When a file using unicode code points outside ASCII is created on a HFS+ drive, the file name is converted into decomposed unicode and written to disk. No conversion is done if the file name is already decomposed unicode. Calling open("\xc3\x84", ...) with a precomposed "Ä" yields the same result as open("\x41\xcc\x88",...) with a decomposed "Ä". As a consequence, readdir() returns the file names in decomposed unicode, even if the user expects precomposed unicode. Unlike on HFS+, Mac OS X stores files on a VFAT drive (e.g. an USB drive) in precomposed unicode, but readdir() still returns file names in decomposed unicode. When a git repository is stored on a network share using SAMBA, file names are send over the wire and written to disk on the remote system in precomposed unicode, but Mac OS X readdir() returns decomposed unicode to be compatible with its behaviour on HFS+ and VFAT. The unicode decomposition causes many problems: - The names "git add" and other commands get from the end user may often be precomposed form (the decomposed form is not easily input from the keyboard), but when the commands read from the filesystem to see what it is going to update the index with already is on the filesystem, readdir() will give decomposed form, which is different. - Similarly "git log", "git mv" and all other commands that need to compare pathnames found on the command line (often but not always precomposed form; a command line input resulting from globbing may be in decomposed) with pathnames found in the tree objects (should be precomposed form to be compatible with other systems and for consistency in general). - The same for names stored in the index, which should be precomposed, that may need to be compared with the names read from readdir(). NFS mounted from Linux is fully transparent and does not suffer from the above. As Mac OS X treats precomposed and decomposed file names as equal, we can - wrap readdir() on Mac OS X to return the precomposed form, and - normalize decomposed form given from the command line also to the precomposed form, to ensure that all pathnames used in Git are always in the precomposed form. This behaviour can be requested by setting "core.precomposedunicode" configuration variable to true. The code in compat/precomposed_utf8.c implements basically 4 new functions: precomposed_utf8_opendir(), precomposed_utf8_readdir(), precomposed_utf8_closedir() and precompose_argv(). The first three are to wrap opendir(3), readdir(3), and closedir(3) functions. The argv[] conversion allows to use the TAB filename completion done by the shell on command line. It tolerates other tools which use readdir() to feed decomposed file names into git. When creating a new git repository with "git init" or "git clone", "core.precomposedunicode" will be set "false". The user needs to activate this feature manually. She typically sets core.precomposedunicode to "true" on HFS and VFAT, or file systems mounted via SAMBA. Helped-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Torsten Bögershausen <tboegi@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2012-07-08 15:50:25 +02:00
probe_utf8_pathname_composition(path, len);
}
return reinit;
}
static void create_object_directory(void)
{
const char *object_directory = get_object_directory();
int len = strlen(object_directory);
char *path = xmalloc(len + 40);
memcpy(path, object_directory, len);
safe_create_dir(object_directory, 1);
strcpy(path+len, "/pack");
safe_create_dir(path, 1);
strcpy(path+len, "/info");
safe_create_dir(path, 1);
free(path);
}
int set_git_dir_init(const char *git_dir, const char *real_git_dir,
int exist_ok)
{
if (real_git_dir) {
struct stat st;
if (!exist_ok && !stat(git_dir, &st))
die(_("%s already exists"), git_dir);
if (!exist_ok && !stat(real_git_dir, &st))
die(_("%s already exists"), real_git_dir);
/*
* make sure symlinks are resolved because we'll be
* moving the target repo later on in separate_git_dir()
*/
git_link = xstrdup(real_path(git_dir));
set_git_dir(real_path(real_git_dir));
}
else {
set_git_dir(real_path(git_dir));
git_link = NULL;
}
return 0;
}
static void separate_git_dir(const char *git_dir)
{
struct stat st;
if (!stat(git_link, &st)) {
const char *src;
if (S_ISREG(st.st_mode))
src = read_gitfile(git_link);
else if (S_ISDIR(st.st_mode))
src = git_link;
else
die(_("unable to handle file type %d"), (int)st.st_mode);
if (rename(src, git_dir))
die_errno(_("unable to move %s to %s"), src, git_dir);
}
write_file(git_link, "gitdir: %s", git_dir);
}
int init_db(const char *template_dir, unsigned int flags)
{
int reinit;
const char *git_dir = get_git_dir();
if (git_link)
separate_git_dir(git_dir);
safe_create_dir(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);
create_object_directory();
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 */
xsnprintf(buf, sizeof(buf), "0%o", -shared_repository);
else if (shared_repository == PERM_GROUP)
xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_GROUP);
else if (shared_repository == PERM_EVERYBODY)
xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_EVERYBODY);
else
die("BUG: invalid value for shared_repository");
git_config_set("core.sharedrepository", buf);
git_config_set("receive.denyNonFastforwards", "true");
}
if (!(flags & INIT_DB_QUIET)) {
int len = strlen(git_dir);
/* TRANSLATORS: The first '%s' is either "Reinitialized
existing" or "Initialized empty", the second " shared" or
"", and the last '%s%s' is the verbatim directory name. */
printf(_("%s%s Git repository in %s%s\n"),
reinit ? _("Reinitialized existing") : _("Initialized empty"),
shared_repository ? _(" shared") : "",
git_dir, len && git_dir[len-1] != '/' ? "/" : "");
}
return 0;
}
static int guess_repository_type(const char *git_dir)
{
const char *slash;
char *cwd;
int cwd_is_git_dir;
/*
* "GIT_DIR=. git init" is always bare.
* "GIT_DIR=`pwd` git init" too.
*/
if (!strcmp(".", git_dir))
return 1;
cwd = xgetcwd();
cwd_is_git_dir = !strcmp(git_dir, cwd);
free(cwd);
if (cwd_is_git_dir)
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 int shared_callback(const struct option *opt, const char *arg, int unset)
{
*((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
return 0;
}
static const char *const init_db_usage[] = {
N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [<directory>]"),
NULL
};
/*
* 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 *real_git_dir = NULL;
const char *work_tree;
const char *template_dir = NULL;
unsigned int flags = 0;
const struct option init_db_options[] = {
OPT_STRING(0, "template", &template_dir, N_("template-directory"),
N_("directory from which templates will be used")),
OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
N_("create a bare repository"), 1),
{ OPTION_CALLBACK, 0, "shared", &init_shared_repository,
N_("permissions"),
N_("specify that the git repository is to be shared amongst several users"),
PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
N_("separate git dir from working tree")),
OPT_END()
};
argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
if (real_git_dir && !is_absolute_path(real_git_dir))
real_git_dir = xstrdup(real_path(real_git_dir));
if (argc == 1) {
int mkdir_tried = 0;
retry:
if (chdir(argv[0]) < 0) {
if (!mkdir_tried) {
int saved;
/*
* At this point we haven't read any configuration,
* and we know shared_repository should always be 0;
* but just in case we play safe.
*/
saved = shared_repository;
shared_repository = 0;
switch (safe_create_leading_directories_const(argv[0])) {
case SCLD_OK:
case SCLD_PERMS:
break;
case SCLD_EXISTS:
errno = EEXIST;
/* fallthru */
default:
die_errno(_("cannot mkdir %s"), argv[0]);
break;
}
shared_repository = saved;
if (mkdir(argv[0], 0777) < 0)
die_errno(_("cannot mkdir %s"), argv[0]);
mkdir_tried = 1;
goto retry;
}
die_errno(_("cannot chdir to %s"), argv[0]);
}
} else if (0 < argc) {
usage(init_db_usage[0]);
}
if (is_bare_repository_cfg == 1) {
char *cwd = xgetcwd();
setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
free(cwd);
}
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);
work_tree = getenv(GIT_WORK_TREE_ENVIRONMENT);
if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
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) {
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(real_path(rel));
free(rel);
}
if (!git_work_tree_cfg)
git_work_tree_cfg = xgetcwd();
if (work_tree)
set_git_work_tree(work_tree);
else
set_git_work_tree(git_work_tree_cfg);
if (access(get_git_work_tree(), X_OK))
die_errno (_("Cannot access work tree '%s'"),
get_git_work_tree());
}
else {
if (work_tree)
set_git_work_tree(work_tree);
}
set_git_dir_init(git_dir, real_git_dir, 1);
return init_db(template_dir, flags);
}