builder/mount-chroot.sh
2014-11-10 05:25:22 +03:00

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1.3 KiB
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#!/usr/bin/env bash
err() { echo "$1" >&2; }
usage() {
cat <<- EOF
Usage: "${0##*/}" [options] <chroot>
Options:
-s chroot base dir
-n mount name
-u unmount chroot
EOF
}
chroot.mount() {
for i in "$target_dir" "$chroot_base"; do
[[ "$i" ]] || {
usage
return 1
}
done
[[ -d "$chroot_base" ]] || {
err "Chroot base ($chroot_base) does not exist."
return 1
}
mount_name="${mount_name:-chroot}"
for i in "$target_dir" "${target_dir}.work"; do
[[ -d "$i" ]] || {
mkdir -p "$i" || {
return 3
}
}
done
mount -t overlayfs -o lowerdir="$chroot_base",upperdir="$target_dir",workdir="${target_dir}.work" "$mount_name" "$target_dir"
mount -t proc "${mount_name}_proc" "${target_dir}/proc"
mount --rbind /dev "${target_dir}/dev"
mount --rbind /sys "${target_dir}/sys"
}
chroot.umount() {
umount --recursive "$target_dir"
}
main() {
while [[ "$1" ]]; do
case "$1" in
-s) chroot_base="$2"; shift;;
-n) mount_name="$2"; shift;;
-u) action='umount';;
--) shift; break;;
-*)
err "Unknown key: $1"
usage
return 1
;;
*) break;;
esac
shift
done
target_dir="$1"
action="${action:-mount}"
mount_name="${mount_name:-chroot}"
case "$action" in
mount) chroot.mount;;
umount) chroot.umount;;
esac
}
main "$@"