init-db.c - git - Git at Google

 /*
  * 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;
 }
	/*
	* 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;
	}