#!/bin/sh

## live-build(7) - System Build Scripts
## Copyright (C) 2016-2025 The Debian Live team
## Copyright (C) 2006-2015 Daniel Baumann <mail@daniel-baumann.ch>
##
## This program comes with ABSOLUTELY NO WARRANTY; for details see COPYING.
## This is free software, and you are welcome to redistribute it
## under certain conditions; see COPYING for details.


set -e

# Including common functions
[ -e "${LIVE_BUILD}/scripts/build.sh" ] && . "${LIVE_BUILD}/scripts/build.sh" || . /usr/lib/live/build.sh

# Setting static variables
DESCRIPTION="Mount /dev"
USAGE="${PROGRAM} {install|remove} [--force]"

# Processing arguments and configuration files
Init_config_data "${@}"

_ACTION="${1}"
shift

# Requiring stage file
Require_stagefiles config bootstrap

case "${_ACTION}" in
	install)
		Echo_message "Begin mounting /dev..."

		# Checking stage file
		Check_stagefile

		# Acquire lock file
		Acquire_lockfile

		# Creating mountpoint
		mkdir -p chroot/dev/pts

		# Mounting /dev/pts
		mount -t devpts -o gid=5,mode=620,x-gvfs-hide devpts-live chroot/dev/pts || true

		# Bind-mount other devices in /dev
		for dev in null zero full random urandom tty console
		do
			# 1. nothing to be done if character device already exists
			# 2. cannot bind-mount if device does not exist on the outside
			if [ ! -c "chroot/dev/$dev" -a -e "/dev/$dev" ]
			then
				# Create an empty file if neccessary
				if [ ! -e "chroot/dev/$dev" ]
				then
					touch "chroot/dev/$dev"
				fi
				mount -o bind "/dev/$dev" "chroot/dev/$dev"
			fi
		done

		# Creating stage file
		Create_stagefile
		;;

	remove)
		Echo_message "Begin unmounting /dev..."

		# Checking stage file
		Ensure_stagefile_exists

		# Acquire lock file
		Acquire_lockfile

		# Unmount and remove the devices in /dev
		# (devtmpfs creates the devices upon booting)
		for dev in pts null zero full random urandom tty console
		do
			if mountpoint -q "chroot/dev/$dev"
			then
				umount "chroot/dev/$dev"
			fi
		done
		rm -fr chroot/dev/*

		# Removing stage file
		Remove_stagefile
		;;

	*)
		Echo_error "Invalid action parameter: '${_ACTION}'"
		Usage --fail
		;;
esac