[thirdparty/git.git] / init-db.c

/*
 * GIT - The information manager from hell
 *
 * Copyright (C) Linus Torvalds, 2005
 */
#include "cache.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)
{
	if (mkdir(dir, 0777) < 0) {
		if (errno != EEXIST) {
			perror(dir);
			exit(1);
		}
	}
}

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);
	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);
	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, char *template_dir)
{
	char path[PATH_MAX];
	char template_path[PATH_MAX];
	int template_len;
	DIR *dir;

	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;
	}

	memcpy(path, git_dir, len);
	path[len] = 0;
	copy_templates_1(path, len,
			 template_path, template_len,
			 dir);
	closedir(dir);
}

static void create_default_files(const char *git_dir,
				 char *template_path)
{
	unsigned len = strlen(git_dir);
	static char path[PATH_MAX];
	unsigned char sha1[20];

	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);
	strcpy(path + len, "refs/heads");
	safe_create_dir(path);
	strcpy(path + len, "refs/tags");
	safe_create_dir(path);

	/*
	 * Create the default symlink from ".git/HEAD" to the "master"
	 * branch, if it does not exist yet.
	 */
	strcpy(path + len, "HEAD");
	if (read_ref(path, sha1) < 0) {
		if (create_symref(path, "refs/heads/master") < 0)
			exit(1);
	}
	path[len] = 0;
	copy_templates(path, len, template_path);

	/*
	 * Find out if we can trust the executable bit.
	 */
	safe_create_dir(path);
	strcpy(path + len, "config");
	if (access(path, R_OK) < 0) {
		static const char contents[] =
			"#\n"
			"# This is the config file\n"
			"#\n"
			"\n"
			"; core variables\n"
			"[core]\n"
			"	; Don't trust file modes\n"
			"	filemode = false\n"
			"\n";
		FILE *config = fopen(path, "w");
		struct stat st;

		if (!config)
			die("Can not write to %s?", path);

		fwrite(contents, sizeof(contents)-1, 1, config);

		fclose(config);

		if (!lstat(path, &st)) {
			struct stat st2;
			if (!chmod(path, st.st_mode ^ S_IXUSR) &&
					!lstat(path, &st2) &&
					st.st_mode != st2.st_mode)
				unlink(path);
			else
				fprintf(stderr, "Ignoring file modes\n");
		}
	}
}

static const char init_db_usage[] =
"git-init-db [--template=<template-directory>]";

/*
 * 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 main(int argc, char **argv)
{
	const char *git_dir;
	const char *sha1_dir;
	char *path, *template_dir = NULL;
	int len, i;

	for (i = 1; i < argc; i++, argv++) {
		char *arg = argv[1];
		if (arg[0] != '-')
			break;
		else if (!strncmp(arg, "--template=", 11))
			template_dir = arg+11;
		else
			die(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;
		fprintf(stderr, "defaulting to local storage area\n");
	}
	safe_create_dir(git_dir);
	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);
	strcpy(path+len, "/pack");
	safe_create_dir(path);
	strcpy(path+len, "/info");
	safe_create_dir(path);
	return 0;
}
Commit	Line	Data
8bc9a0c7 LT	1	/*
	2	* GIT - The information manager from hell
	3	*
	4	* Copyright (C) Linus Torvalds, 2005
	5	*/
e83c5163 LT	6	#include "cache.h"
e83c5163 LT	7
d3af621b JH	8	#ifndef DEFAULT_GIT_TEMPLATE_DIR
	9	#define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates/"
	10	#endif
	11
e99d59ff	12	static void safe_create_dir(const char *dir)
cb126d8d	13	{
f312de01	14	if (mkdir(dir, 0777) < 0) {
cb126d8d ZW	15	if (errno != EEXIST) {
	16	perror(dir);
	17	exit(1);
	18	}
	19	}
	20	}
	21
8d5afef0 JH	22	static int copy_file(const char dst, const char src, int mode)
8d5afef0 JH	23	{
32276c80	24	int fdi, fdo, status;
8d5afef0 JH	25
	26	mode = (mode & 0111) ? 0777 : 0666;
	27	if ((fdi = open(src, O_RDONLY)) < 0)
	28	return fdi;
	29	if ((fdo = open(dst, O_WRONLY \| O_CREAT \| O_EXCL, mode)) < 0) {
	30	close(fdi);
	31	return fdo;
	32	}
32276c80	33	status = copy_fd(fdi, fdo);
8d5afef0	34	close(fdo);
32276c80	35	return status;
8d5afef0 JH	36	}
	37
	38	static void copy_templates_1(char *path, int baselen,
	39	char *template, int template_baselen,
	40	DIR *dir)
	41	{
	42	struct dirent *de;
	43
	44	/* Note: if ".git/hooks" file exists in the repository being
	45	* re-initialized, /etc/core-git/templates/hooks/update would
	46	* cause git-init-db to fail here. I think this is sane but
	47	* it means that the set of templates we ship by default, along
	48	* with the way the namespace under .git/ is organized, should
	49	* be really carefully chosen.
	50	*/
	51	safe_create_dir(path);
	52	while ((de = readdir(dir)) != NULL) {
	53	struct stat st_git, st_template;
	54	int namelen;
	55	int exists = 0;
	56
	57	if (de->d_name[0] == '.')
	58	continue;
	59	namelen = strlen(de->d_name);
	60	if ((PATH_MAX <= baselen + namelen) \|\|
	61	(PATH_MAX <= template_baselen + namelen))
	62	die("insanely long template name %s", de->d_name);
	63	memcpy(path + baselen, de->d_name, namelen+1);
	64	memcpy(template + template_baselen, de->d_name, namelen+1);
	65	if (lstat(path, &st_git)) {
	66	if (errno != ENOENT)
	67	die("cannot stat %s", path);
	68	}
	69	else
	70	exists = 1;
	71
	72	if (lstat(template, &st_template))
	73	die("cannot stat template %s", template);
	74
	75	if (S_ISDIR(st_template.st_mode)) {
	76	DIR *subdir = opendir(template);
	77	int baselen_sub = baselen + namelen;
	78	int template_baselen_sub = template_baselen + namelen;
	79	if (!subdir)
	80	die("cannot opendir %s", template);
	81	path[baselen_sub++] =
	82	template[template_baselen_sub++] = '/';
	83	path[baselen_sub] =
	84	template[template_baselen_sub] = 0;
	85	copy_templates_1(path, baselen_sub,
	86	template, template_baselen_sub,
	87	subdir);
	88	closedir(subdir);
	89	}
	90	else if (exists)
	91	continue;
	92	else if (S_ISLNK(st_template.st_mode)) {
	93	char lnk[256];
	94	int len;
	95	len = readlink(template, lnk, sizeof(lnk));
	96	if (len < 0)
	97	die("cannot readlink %s", template);
	98	if (sizeof(lnk) <= len)
	99	die("insanely long symlink %s", template);
100	lnk[len] = 0;
101	if (symlink(lnk, path))
102	die("cannot symlink %s %s", lnk, path);
103	}
104	else if (S_ISREG(st_template.st_mode)) {
105	if (copy_file(path, template, st_template.st_mode))
106	die("cannot copy %s to %s", template, path);
107	}
108	else
109	error("ignoring template %s", template);
110	}
111	}
112
d3af621b	113	static void copy_templates(const char git_dir, int len, char template_dir)
8d5afef0 JH	114	{
	115	char path[PATH_MAX];
	116	char template_path[PATH_MAX];
d3af621b	117	int template_len;
8d5afef0 JH	118	DIR *dir;
8d5afef0 JH	119
8d5afef0	120	if (!template_dir)
d3af621b	121	template_dir = DEFAULT_GIT_TEMPLATE_DIR;
8d5afef0 JH	122	strcpy(template_path, template_dir);
	123	template_len = strlen(template_path);
	124	if (template_path[template_len-1] != '/') {
	125	template_path[template_len++] = '/';
	126	template_path[template_len] = 0;
	127	}
8d5afef0	128	dir = opendir(template_path);
d3af621b JH	129	if (!dir) {
	130	fprintf(stderr, "warning: templates not found %s\n",
	131	template_dir);
8d5afef0	132	return;
d3af621b JH	133	}
	134
	135	memcpy(path, git_dir, len);
1f961c19	136	path[len] = 0;
8d5afef0 JH	137	copy_templates_1(path, len,
	138	template_path, template_len,
	139	dir);
	140	closedir(dir);
	141	}
	142
d3af621b JH	143	static void create_default_files(const char *git_dir,
d3af621b JH	144	char *template_path)
cad88fdf LT	145	{
	146	unsigned len = strlen(git_dir);
	147	static char path[PATH_MAX];
8098a178	148	unsigned char sha1[20];
cad88fdf LT	149
	150	if (len > sizeof(path)-50)
	151	die("insane git directory %s", git_dir);
	152	memcpy(path, git_dir, len);
	153
	154	if (len && path[len-1] != '/')
	155	path[len++] = '/';
	156
	157	/*
	158	* Create .git/refs/{heads,tags}
	159	*/
	160	strcpy(path + len, "refs");
	161	safe_create_dir(path);
	162	strcpy(path + len, "refs/heads");
	163	safe_create_dir(path);
	164	strcpy(path + len, "refs/tags");
	165	safe_create_dir(path);
	166
	167	/*
	168	* Create the default symlink from ".git/HEAD" to the "master"
8098a178	169	* branch, if it does not exist yet.
cad88fdf LT	170	*/
cad88fdf LT	171	strcpy(path + len, "HEAD");
8098a178 JH	172	if (read_ref(path, sha1) < 0) {
8098a178 JH	173	if (create_symref(path, "refs/heads/master") < 0)
cad88fdf	174	exit(1);
cad88fdf	175	}
8098a178	176	path[len] = 0;
d3af621b	177	copy_templates(path, len, template_path);
e24317b4 JS	178
	179	/*
	180	* Find out if we can trust the executable bit.
	181	*/
	182	safe_create_dir(path);
	183	strcpy(path + len, "config");
	184	if (access(path, R_OK) < 0) {
	185	static const char contents[] =
	186	"#\n"
	187	"# This is the config file\n"
	188	"#\n"
	189	"\n"
	190	"; core variables\n"
	191	"[core]\n"
	192	" ; Don't trust file modes\n"
	193	" filemode = false\n"
	194	"\n";
	195	FILE *config = fopen(path, "w");
	196	struct stat st;
	197
	198	if (!config)
	199	die("Can not write to %s?", path);
	200
	201	fwrite(contents, sizeof(contents)-1, 1, config);
	202
	203	fclose(config);
	204
	205	if (!lstat(path, &st)) {
	206	struct stat st2;
	207	if (!chmod(path, st.st_mode ^ S_IXUSR) &&
	208	!lstat(path, &st2) &&
	209	st.st_mode != st2.st_mode)
	210	unlink(path);
	211	else
	212	fprintf(stderr, "Ignoring file modes\n");
	213	}
	214	}
cad88fdf LT	215	}
cad88fdf LT	216
d3af621b JH	217	static const char init_db_usage[] =
	218	"git-init-db [--template=<template-directory>]";
	219
4696cb93 ZW	220	/*
	221	* If you want to, you can share the DB area with any number of branches.
	222	* That has advantages: you can save space by sharing all the SHA1 objects.
	223	* On the other hand, it might just make lookup slower and messier. You
	224	* be the judge. The default case is to have one DB per managed directory.
	225	*/
e83c5163 LT	226	int main(int argc, char **argv)
e83c5163 LT	227	{
cad88fdf	228	const char *git_dir;
d19938ab	229	const char *sha1_dir;
d3af621b	230	char path, template_dir = NULL;
19b2860c	231	int len, i;
e83c5163	232
d3af621b JH	233	for (i = 1; i < argc; i++, argv++) {
	234	char *arg = argv[1];
	235	if (arg[0] != '-')
	236	break;
	237	else if (!strncmp(arg, "--template=", 11))
	238	template_dir = arg+11;
	239	else
	240	die(init_db_usage);
	241	}
	242
cad88fdf LT	243	/*
	244	* Set up the default .git directory contents
	245	*/
a9ab586a	246	git_dir = getenv(GIT_DIR_ENVIRONMENT);
cad88fdf LT	247	if (!git_dir) {
cad88fdf LT	248	git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
addb315d	249	fprintf(stderr, "defaulting to local storage area\n");
e83c5163	250	}
cad88fdf	251	safe_create_dir(git_dir);
d3af621b	252	create_default_files(git_dir, template_dir);
cad88fdf LT	253
	254	/*
	255	* And set up the object store.
	256	*/
	257	sha1_dir = get_object_directory();
e83c5163	258	len = strlen(sha1_dir);
812666c8	259	path = xmalloc(len + 40);
e83c5163	260	memcpy(path, sha1_dir, len);
cb126d8d ZW	261
cb126d8d ZW	262	safe_create_dir(sha1_dir);
f49fb35d LT	263	strcpy(path+len, "/pack");
f49fb35d LT	264	safe_create_dir(path);
d57306c7 JH	265	strcpy(path+len, "/info");
d57306c7 JH	266	safe_create_dir(path);
e83c5163 LT	267	return 0;
e83c5163 LT	268	}