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|
#!/bin/bash
set -e
# Directory in which the root filesystem is contained
#
ROOTFS=$(pwd)/cb5-rootfs
print_usage() {
cat 1>&2 <<EOF
Usage: $0 rootfs-directory
Start a shell in a root filesystem. Mounting and unmounting temporary driver filesystems
is handled by this script.
EOF
}
# Process options
#
while [ $# -gt 1 ]
do
case "$1" in
--help|-h)
print_usage
exit 0
;;
*)
echo "Unknown option '$1'" 1>&2
exit 1
esac
shift
done
# Process last argument, the root file system location
if [ -z "$1" ] || [ "$1" = -h ] || [ "$1" = --help ]; then
print_usage
exit 1
fi
if [ "$EUID" -ne 0 ]; then
echo "This must be run as root." 1>&2
exit 1
fi
export ROOTFS="$1"
# Unmount and remove any temporary files
#
cleanup() {
set +e
# Identify and kill all processes still using files
echo "Killing processes using mount point" 1>&2
fuser -k "${ROOTFS}"
sleep 3
fuser -9 -k -v "${ROOTFS}"
# Clean up all temporary mount points
echo "Removing temporary mount points" 1>&2
umount -l "${ROOTFS}/proc" 2> /dev/null
umount -l "${ROOTFS}/sys" 2> /dev/null
umount -l "${ROOTFS}/dev/pts" 2> /dev/null
umount -l "${ROOTFS}/dev" 2> /dev/null
trap - 0 1 2 3 6
}
trap cleanup 0 1 2 3 6
# Prepare filesystem to be chrooted
#
echo "Creating temporary system mount points in rootfs" 1>&2
mount -t proc chproc "$ROOTFS/proc"
mount -t sysfs chsys "$ROOTFS/sys"
mount -t devtmpfs chdev "$ROOTFS/dev"
mount -t devpts chpts "$ROOTFS/dev/pts"
echo "Starting shell in rootfs" 1>&2
LANG=C LC_ALL=C DEBIAN_FRONTEND=noninteractive chroot ${ROOTFS}
cleanup
echo "Cleaned up"
|
