mv

sh/alias/overlay.sh

@@ -0,0 +1,131 @@
+mo() {
+	local root="${1}"
+	if [ -z "${root}" ]; then
+		sh_log_error "No root target directory"
+		return 1
+	fi
+	root="$(realpath "${root}")"
+	if ! mkdir "overlay"; then
+		sh_log_error "Unable to make overlay directory"
+		return 2
+	fi
+	(
+		if ! cd "overlay"; then
+			sh_log_error "Unable to move into overlay directory"
+			return 3
+		fi
+		local directory
+		for directory in "lower" "upper" "work" "mount"; do
+			if ! mkdir --parents "${directory}"; then
+				sh_log_error "Unable to make directory: ${directory}"
+				return 4
+			fi
+		done
+		local file="${root}/filesystem.squashfs"
+		if ! mount "${file}" "lower"; then
+			sh_log_error "Unable to lower mount: ${file}"
+			return 5
+		fi
+		if ! mount \
+			-o "lowerdir=lower,upperdir=upper,workdir=work" \
+			-t "overlay" \
+			"overlay" "mount"; then
+			sh_log_error "Unable to overlay mount"
+			return 6
+		fi
+	)
+}
+
+uo() {
+	(
+		if ! cd "overlay"; then
+			sh_log_error "Unable to move into overlay directory"
+			return 1
+		fi
+		if ! umount "mount"; then
+			sh_log_error "Unable to unmount mount directory"
+			return 2
+		fi
+		if ! rmdir "mount"; then
+			sh_log_error "Unable to remove mount directory"
+			return 3
+		fi
+		local directory
+		for directory in "upper" "work"; do
+			if ! rm --force --recursive "${directory}"; then
+				sh_log_error "Unable to remove directory: ${directory}"
+				return 4
+			fi
+		done
+		if ! umount "lower"; then
+			sh_log_error "Unable to unmount lower directory"
+			return 5
+		fi
+		if ! rmdir "lower"; then
+			sh_log_error "Unable to remove lower directory"
+			return 6
+		fi
+	)
+	if ! rmdir "overlay"; then
+		sh_log_error "Unable to remove overlay directory"
+		return 7
+	fi
+}
+
+mr() {
+	local directory
+	for directory in "dev" "dev/pts" "proc" "sys"; do
+		if ! mount --bind "/${directory}" "overlay/mount/${directory}"; then
+			sh_log_error "Unable to bind mount directory: ${directory}"
+			return 1
+		fi
+	done
+}
+
+cr() {
+	chroot \
+		"overlay/mount" "${@}"
+}
+
+cru() {
+	chroot \
+		--userspec "1000:1000" \
+		"overlay/mount" "${@}"
+}
+
+ur() {
+	local directory
+	for directory in "sys" "proc" "dev/pts" "dev"; do
+		if ! umount --lazy "overlay/mount/${directory}"; then
+			sh_log_error "Unable to bind unmount directory: ${directory}"
+			return 1
+		fi
+	done
+}
+
+mm() {
+	mount --make-rslave --rbind "/deb" "overlay/mount/deb"
+}
+
+um() {
+	umount --recursive "overlay/mount/deb"
+}
+
+ms() {
+	local directory="${1}"
+	local file
+	local level="${2}"
+	if [ -n "${directory}" ]; then
+		if mkdir "${directory}"; then
+			[ -n "${level}" ] || level="18"
+			for file in "vmlinuz" "initrd.img"; do
+				cp "overlay/mount/${file}" "${directory}"
+			done
+			mksquashfs \
+				"overlay/mount" "${directory}/filesystem.squashfs" \
+				-noappend \
+				-comp "zstd" -Xcompression-level "${level}"
+			chown --recursive 1000:1000 "${directory}"
+		fi
+	fi
+}