dracut: Remove switch_root.c

[people/pmueller/ipfire-2.x.git] / src / dracut / switch_root.c

diff --git a/src/dracut/switch_root.c b/src/dracut/switch_root.c
deleted file mode 100644 (file)
index 1520387..0000000
--- a/src/dracut/switch_root.c
+++ /dev/null
@@ -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);
-}
-