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#!/bin/bash
# Example:
#
# 1) sudo mount /data/diskimages/rootfs-arm64.img /mnt/tst
#
# 2a) example invocation 1, multiline shell script
# on_chroot /mnt << EOF
# whoami
# EOF
#
# 2b) example invocation 2, one line command
# on_chroot /mnt -c "whoami"
#
# 2b) example invocation 3, interactive bash
# on_chroot /mnt -c "bash"
#
# 3) sudo ./imagetool.sh -u /mnt/tst
#
sdir=`dirname $(readlink -f $0)`
rootdir=`dirname $sdir`
parentdir=`dirname $rootdir`
echo sdir ${sdir}
echo rootdir ${rootdir}
echo parentdir ${parentdir}
username=${USER}
export ROOTFS_DIR=$1
shift 1
if [ -z "${ROOTFS_DIR}" ]; then
echo Usage "$0 <rootfs-dir> commands..."
exit 1
fi
rootfs_parentdir="${ROOTFS_DIR}${parentdir}"
echo rootfs_parentdir ${rootfs_parentdir}
if ! mount | grep -q "$(realpath "${ROOTFS_DIR}"/proc)"; then
sudo mount -t proc proc "${ROOTFS_DIR}/proc"
fi
if ! mount | grep -q "$(realpath "${ROOTFS_DIR}"/dev)"; then
sudo mount --bind /dev "${ROOTFS_DIR}/dev"
fi
if ! mount | grep -q "$(realpath "${ROOTFS_DIR}"/dev/pts)"; then
sudo mount --bind /dev/pts "${ROOTFS_DIR}/dev/pts"
fi
if ! mount | grep -q "$(realpath "${ROOTFS_DIR}"/sys)"; then
sudo mount --bind /sys "${ROOTFS_DIR}/sys"
fi
if ! mount | grep -q "${rootfs_parentdir}"; then
sudo mkdir -p "${rootfs_parentdir}"
sudo mount --bind ${parentdir} "${rootfs_parentdir}"
fi
# sudo chroot ${ROOTFS_DIR}/ /bin/bash "$@"
sudo /sbin/capsh --user=$username --drop=cap_setfcap "--chroot=${ROOTFS_DIR}/" -- -e "$@"
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