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/*
* 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 <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <stddef.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/param.h>
#include <sys/mount.h>
#include <dirent.h>
#include <fcntl.h>
#include <libgen.h>
#include "log.h"
lxc_log_define(lxc_utils, lxc);
int lxc_copy_file(const char *srcfile, const char *dstfile)
{
void *srcaddr = NULL, *dstaddr;
struct stat stat;
int srcfd, dstfd, ret = -1;
char c = '\0';
dstfd = open(dstfile, O_CREAT | O_EXCL | O_RDWR, 0600);
if (dstfd < 0) {
SYSERROR("failed to creat '%s'", dstfile);
goto out;
}
srcfd = open(srcfile, O_RDONLY);
if (srcfd < 0) {
SYSERROR("failed to open '%s'", srcfile);
goto err;
}
if (fstat(srcfd, &stat)) {
SYSERROR("failed to stat '%s'", srcfile);
goto err;
}
if (!stat.st_size) {
INFO("copy '%s' which is an empty file", srcfile);
ret = 0;
goto out_close;
}
if (lseek(dstfd, stat.st_size - 1, SEEK_SET) < 0) {
SYSERROR("failed to seek dest file '%s'", dstfile);
goto err;
}
/* fixup length */
if (write(dstfd, &c, 1) < 0) {
SYSERROR("failed to write to '%s'", dstfile);
goto err;
}
srcaddr = mmap(NULL, stat.st_size, PROT_READ, MAP_SHARED, srcfd, 0L);
if (srcaddr == MAP_FAILED) {
SYSERROR("failed to mmap '%s'", srcfile);
goto err;
}
dstaddr = mmap(NULL, stat.st_size, PROT_WRITE, MAP_SHARED, dstfd, 0L);
if (dstaddr == MAP_FAILED) {
SYSERROR("failed to mmap '%s'", dstfile);
goto err;
}
ret = 0;
memcpy(dstaddr, srcaddr, stat.st_size);
munmap(dstaddr, stat.st_size);
out_mmap:
if (srcaddr)
munmap(srcaddr, stat.st_size);
out_close:
close(dstfd);
close(srcfd);
out:
return ret;
err:
unlink(dstfile);
goto out_mmap;
}
static int mount_fs(const char *source, const char *target, const char *type)
{
/* the umount may fail */
if (umount(target))
WARN("failed to unmount %s : %s", target, strerror(errno));
if (mount(source, target, type, 0, NULL)) {
ERROR("failed to mount %s : %s", target, strerror(errno));
return -1;
}
DEBUG("'%s' mounted on '%s'", source, target);
return 0;
}
extern int lxc_setup_fs(void)
{
if (mount_fs("proc", "/proc", "proc"))
return -1;
/* if we can't mount /dev/shm, continue anyway */
if (mount_fs("shmfs", "/dev/shm", "tmpfs"))
DEBUG("failed to mount /dev/shm");
/* If we were able to mount /dev/shm, then /dev exists */
/* Sure, but it's read-only per config :) */
if (access("/dev/mqueue", F_OK) && mkdir("/dev/mqueue", 0666)) {
DEBUG("failed to create '/dev/mqueue'");
return 0;
}
if (mount_fs("mqueue", "/dev/mqueue", "mqueue"))
return -1;
return 0;
}
/* borrowed from iproute2 */
extern int get_u16(ushort *val, const char *arg, int base)
{
unsigned long res;
char *ptr;
if (!arg || !*arg)
return -1;
res = strtoul(arg, &ptr, base);
if (!ptr || ptr == arg || *ptr || res > 0xFFFF)
return -1;
*val = res;
return 0;
}
extern int mkdir_p(char *dir, mode_t mode)
{
int ret;
char *d;
if (!strcmp(dir, "/"))
return 0;
d = strdup(dir);
if (!d)
return -1;
ret = mkdir_p(dirname(d), mode);
free(d);
if (ret)
return -1;
if (!access(dir, F_OK))
return 0;
if (mkdir(dir, mode)) {
SYSERROR("failed to create directory '%s'\n", dir);
return -1;
}
return 0;
}
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