use config.h to define the lxcpath and co

[mirror_lxc.git] / src / lxc / create.c

/*
 * lxc: linux Container library
 *
 * (C) Copyright IBM Corp. 2007, 2008
 *
 * Authors:
 * Daniel Lezcano <dlezcano at fr.ibm.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#define _GNU_SOURCE
#include <stdio.h>
#undef _GNU_SOURCE
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <unistd.h>
#include <errno.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "error.h"
#include <lxc/lxc.h>
#include <lxc/log.h>

#include "config.h"

lxc_log_define(lxc_create, lxc);

static int dir_filter(const struct dirent *dirent)
{
	if (!strcmp(dirent->d_name, ".") ||
            !strcmp(dirent->d_name, ".."))
                return 0;
        return 1;
}

static int is_empty_directory(const char *dirname)
{
	struct dirent **namelist;
	int n;

	n = scandir(dirname, &namelist, dir_filter, alphasort);
	if (n < 0)
		SYSERROR("failed to scan %s directory", dirname);
	return n == 0;
}

static int create_lxc_directory(const char *dirname)
{
	char path[MAXPATHLEN];

	if (mkdir(LXCPATH, 0755) && errno != EEXIST) {
		SYSERROR("failed to create %s directory", LXCPATH);
		return -1;
	}

	snprintf(path, MAXPATHLEN, LXCPATH "/%s", dirname);

	if (mkdir(path, 0755)) {
		SYSERROR("failed to create %s directory", path);
		return -1;
	}

	return 0;
}

static int remove_lxc_directory(const char *dirname)
{
	char path[MAXPATHLEN];

	snprintf(path, MAXPATHLEN, LXCPATH "/%s", dirname);

	if (rmdir(path)) {
		SYSERROR("failed to remove %s directory", path);
		return -1;
	}

	if (is_empty_directory(LXCPATH)) {
		if (rmdir(LXCPATH)) {
			SYSERROR("failed to remove %s directory", LXCPATH);
			return -1;
		}
	}

	return 0;
}

static int copy_config_file(const char *name, const char *file)
{
	char *dst;
	int ret = -1;

	if (!asprintf(&dst, LXCPATH "/%s/config", name)) {
		ERROR("failed to allocate memory");
		return -1;
	}

	ret = lxc_copy_file(file, dst);
	if (ret)
		ERROR("failed to copy '%s' to '%s'", file, dst);

	free(dst);

	return ret;
}

int lxc_create(const char *name, const char *confile)
{
	int lock, err = -1;

	if (create_lxc_directory(name))
		return err;
	
	if (!confile)
		return 0;

	lock = lxc_get_lock(name);
	if (lock < 0)
		goto err;

	if (copy_config_file(name, confile)) {
		ERROR("failed to copy the configuration file");
		goto err_state;
	}

	err = 0;
out:
	lxc_put_lock(lock);
	return err;

err_state:
	lxc_unconfigure(name);

	if (lxc_rmstate(name))
		ERROR("failed to remove state file for %s", name);
err:
	if (remove_lxc_directory(name))
		ERROR("failed to cleanup lxc directory for %s", name);
	goto out;
}