mirror of
https://github.com/vincentmli/bpfire.git
synced 2026-04-10 02:55:55 +02:00
dracut: Remove switch_root.c
This commit is contained in:
Michael Tremer
@@ -1,188 +0,0 @@
|
||||
/*
|
||||
* switchroot.c - switch to new root directory and start init.
|
||||
*
|
||||
* Copyright 2002-2008 Red Hat, Inc. All rights reserved.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This program 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 General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||
*
|
||||
* Authors:
|
||||
* Peter Jones <pjones@redhat.com>
|
||||
* Jeremy Katz <katzj@redhat.com>
|
||||
*/
|
||||
#include <sys/mount.h>
|
||||
#include <sys/types.h>
|
||||
#include <sys/stat.h>
|
||||
#include <sys/param.h>
|
||||
#include <fcntl.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <unistd.h>
|
||||
#include <string.h>
|
||||
#include <errno.h>
|
||||
#include <ctype.h>
|
||||
#include <dirent.h>
|
||||
|
||||
#ifndef MS_MOVE
|
||||
#define MS_MOVE 8192
|
||||
#endif
|
||||
|
||||
enum {
|
||||
ok,
|
||||
err_no_directory,
|
||||
err_usage,
|
||||
};
|
||||
|
||||
/* remove all files/directories below dirName -- don't cross mountpoints */
|
||||
static int
|
||||
recursiveRemove(char * dirName)
|
||||
{
|
||||
struct stat sb,rb;
|
||||
DIR * dir;
|
||||
struct dirent * d;
|
||||
char * strBuf = alloca(strlen(dirName) + 1024);
|
||||
|
||||
if (!(dir = opendir(dirName))) {
|
||||
printf("error opening %s: %m\n", dirName);
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (fstat(dirfd(dir),&rb)) {
|
||||
printf("unable to stat %s: %m\n", dirName);
|
||||
closedir(dir);
|
||||
return 0;
|
||||
}
|
||||
|
||||
errno = 0;
|
||||
|
||||
while ((d = readdir(dir))) {
|
||||
errno = 0;
|
||||
|
||||
if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, "..")) {
|
||||
errno = 0;
|
||||
continue;
|
||||
}
|
||||
|
||||
strcpy(strBuf, dirName);
|
||||
strcat(strBuf, "/");
|
||||
strcat(strBuf, d->d_name);
|
||||
|
||||
if (lstat(strBuf, &sb)) {
|
||||
printf("failed to stat %s: %m\n", strBuf);
|
||||
errno = 0;
|
||||
continue;
|
||||
}
|
||||
|
||||
/* only descend into subdirectories if device is same as dir */
|
||||
if (S_ISDIR(sb.st_mode)) {
|
||||
if (sb.st_dev == rb.st_dev) {
|
||||
recursiveRemove(strBuf);
|
||||
if (rmdir(strBuf))
|
||||
printf("failed to rmdir %s: %m\n", strBuf);
|
||||
}
|
||||
errno = 0;
|
||||
continue;
|
||||
}
|
||||
if (unlink(strBuf)) {
|
||||
printf("failed to remove %s: %m\n", strBuf);
|
||||
errno = 0;
|
||||
continue;
|
||||
}
|
||||
}
|
||||
|
||||
if (errno) {
|
||||
closedir(dir);
|
||||
printf("error reading from %s: %m\n", dirName);
|
||||
return 1;
|
||||
}
|
||||
|
||||
closedir(dir);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int switchroot(const char *newroot)
|
||||
{
|
||||
/* Don't try to unmount the old "/", there's no way to do it. */
|
||||
const char *umounts[] = { "/dev", "/proc", "/sys", NULL };
|
||||
int errnum;
|
||||
int i;
|
||||
|
||||
for (i = 0; umounts[i] != NULL; i++) {
|
||||
char newmount[PATH_MAX];
|
||||
strcpy(newmount, newroot);
|
||||
strcat(newmount, umounts[i]);
|
||||
if (mount(umounts[i], newmount, NULL, MS_MOVE, NULL) < 0) {
|
||||
fprintf(stderr, "Error mount moving old %s %s %m\n",
|
||||
umounts[i], newmount);
|
||||
fprintf(stderr, "Forcing unmount of %s\n", umounts[i]);
|
||||
umount2(umounts[i], MNT_FORCE);
|
||||
}
|
||||
}
|
||||
|
||||
if (chdir(newroot) < 0) {
|
||||
errnum=errno;
|
||||
fprintf(stderr, "switchroot: chdir failed: %m\n");
|
||||
errno=errnum;
|
||||
return -1;
|
||||
}
|
||||
recursiveRemove("/");
|
||||
if (mount(newroot, "/", NULL, MS_MOVE, NULL) < 0) {
|
||||
errnum = errno;
|
||||
fprintf(stderr, "switchroot: mount failed: %m\n");
|
||||
errno = errnum;
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (chroot(".")) {
|
||||
errnum = errno;
|
||||
fprintf(stderr, "switchroot: chroot failed: %m\n");
|
||||
errno = errnum;
|
||||
return -2;
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
|
||||
static void usage(FILE *output)
|
||||
{
|
||||
fprintf(output, "usage: switchroot <newrootdir> <init> <args to init>\n");
|
||||
if (output == stderr)
|
||||
exit(err_usage);
|
||||
exit(ok);
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[])
|
||||
{
|
||||
char *newroot = argv[1];
|
||||
char *init = argv[2];
|
||||
char **initargs = &argv[2];
|
||||
|
||||
if (newroot == NULL || newroot[0] == '\0' ||
|
||||
init == NULL || init[0] == '\0' ) {
|
||||
usage(stderr);
|
||||
}
|
||||
|
||||
if (switchroot(newroot) < 0) {
|
||||
fprintf(stderr, "switchroot has failed. Sorry.\n");
|
||||
return 1;
|
||||
}
|
||||
if (access(initargs[0], X_OK))
|
||||
fprintf(stderr, "WARNING: can't access %s\n", initargs[0]);
|
||||
|
||||
/* get session leader */
|
||||
setsid();
|
||||
/* set controlling terminal */
|
||||
ioctl (0, TIOCSCTTY, 1);
|
||||
|
||||
execv(initargs[0], initargs);
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user