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|
#!/bin/sh
#
# script to enter chroot
printhelp() {
cat << EOF
Usage:
$(basename $0) <chroot-dir> [command]
If 'command' is unspecified, ${0##*/} will launch /bin/sh.
EOF
}
msgerr() {
echo "ERROR: $*"
}
unmount() {
while [ "$(mount | awk '{print $3}' | grep -x $1)" ]; do
umount $1 2>/dev/null || :
done
}
umountall() {
for i in $(mount | awk '{print $3}' | grep $TARGET | tac); do
unmount $i
done
}
[ "$(id -u)" = "0" ] || {
msgerr "$(basename $0) need root access!"
printhelp
exit 1
}
TARGET=$(realpath $1)
trap umountall 1 2 3 15
[ "$1" ] || {
msgerr "Please set directory for chroot!"
printhelp
exit 1
}
[ -d "$TARGET" ] || {
msgerr "Directory '$TARGET' not exist!"
printhelp
exit 1
}
shift
if [ ! "$1" ]; then
CMD="/bin/sh"
else
CMD=$*
fi
if [ -e /sys/firmware/efi/systab ]; then
EFI_SYSTEM=1
fi
mount --bind /dev $TARGET/dev
mount -t devpts devpts $TARGET/dev/pts -o gid=5,mode=620
mount -t proc proc $TARGET/proc
mount -t sysfs sysfs $TARGET/sys
if [ -n "$EFI_SYSTEM" ]; then
mount --bind /sys/firmware/efi/efivars $TARGET/sys/firmware/efi/efivars
fi
mount -t tmpfs tmpfs $TARGET/run
if [ -h $TARGET/dev/shm ]; then
mkdir -p $TARGET/$(readlink $TARGET/dev/shm)
fi
[ -f $TARGET/etc/resolv.conf ] && {
backupresolvconf=1
mv $TARGET/etc/resolv.conf $TARGET/etc/resolv.conf.tmp
}
cp -L /etc/resolv.conf $TARGET/etc
chroot "$TARGET" /usr/bin/env -i \
HOME=/root \
TERM="$TERM" \
PS1='\u:\w\$ ' \
PATH=/bin:/usr/bin:/sbin:/usr/sbin $CMD
retval=$?
[ "$backupresolvconf" = 1 ] && {
mv $TARGET/etc/resolv.conf.tmp $TARGET/etc/resolv.conf
}
unmount $TARGET/dev/pts
unmount $TARGET/dev
unmount $TARGET/run
unmount $TARGET/proc
if [ -n "$EFI_SYSTEM" ]; then
unmount $TARGET/sys/firmware/efi/efivars
fi
unmount $TARGET/sys
exit $retval
|
