Created
July 4, 2012 09:15
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Script to manage chroot
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#!/bin/bash | |
if [ "$UID" != "0" ] | |
then | |
echo "You have to be root" >&2 | |
exit 1 | |
fi | |
CHROOT=$1 | |
if [ ! -f $CHROOT.in ] | |
then | |
for mnt in /dev /dev/pts /proc /sys | |
do | |
echo "-- Mounting $mnt on $CHROOT/$mnt" | |
mount -o bind $mnt $CHROOT/$mnt || exit 1 | |
done | |
if [ -f $CHROOT.shared ] | |
then | |
cat $CHROOT.shared | while read entry | |
do | |
folder=${entry%:*} | |
mnt=${entry#*:} | |
echo "-- Mounting $folder on $CHROOT/$mnt" | |
mkdir -p $CHROOT/$mnt || exit 1 | |
mount -o bind $folder $CHROOT/$mnt || exit 1 | |
done | |
fi | |
echo "1" > $CHROOT.in | |
else | |
n=`cat $CHROOT.in` | |
let n=$n+1 | |
echo "$n" > $CHROOT.in | |
fi | |
echo "-- Entering chroot" | |
chroot $CHROOT /usr/bin/env HOME=/root TERM=$TERM /bin/bash --login +h || exit 1; | |
n=`cat $CHROOT.in` | |
let n=$n-1 | |
if [ "$n" = "0" ] | |
then | |
for umnt in /sys /proc /dev/pts /dev | |
do | |
echo "-- Umounting $CHROOT/$umnt" | |
umount $CHROOT/$umnt || exit 1 | |
done | |
if [ -f $CHROOT.shared ] | |
then | |
cat $CHROOT.shared | while read entry | |
do | |
mnt=${entry#*:} | |
echo "-- Umounting $CHROOT/$mnt" | |
umount $CHROOT/$mnt || exit 1 | |
done | |
fi | |
rm $CHROOT.in | |
else | |
echo "$n" > $CHROOT.in | |
fi |
How to use this script (assuming I have saved above file in ~/enter-chroot.bash) ?
Wow, I was not expecting someone to use a script that old ( so old I didn't remember writing it :D ).
This will do the trick:
$ sudo bash /path/to/enter-chroot.bash /path/to/my/chroot
And you can create a file /path/to/my/chroot.shared
to mount specific folders inside it (see my comment above).
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$CHROOT.shared
contains shared folder to be binded in the chroot :This will mount
/home/linkdd/Documents
on$CHROOT/mnt/shared/Documents
, if the directory doesn't exist, it will be created.$CHROOT.in
contains the number of user currently in the chroot, when the first user enter into it, all filesystems are mounted, and when the last leaves the chroot, all filesystems are umounted