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