live-build/scripts/build/chroot_sysfs

#!/bin/sh

## live-build(7) - System Build Scripts
## Copyright (C) 2006-2013 Daniel Baumann <daniel@debian.org>
##
## 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="$(Echo 'mount /sys')"
HELP=""
USAGE="${PROGRAM} {install|remove} [--force]"

Arguments "${@}"

# Ensure that a system is built as root
lb testroot

# Reading configuration files
Read_conffiles config/all config/common config/bootstrap config/chroot config/binary config/source
Set_defaults

# Requiring stage file
Require_stagefile .build/config .build/bootstrap

case "${1}" in
	install)
		Echo_message "Begin mounting /sys..."

		# Checking stage file
		Check_stagefile .build/chroot_sysfs

		# Checking lock file
		Check_lockfile .lock

		# Creating lock file
		Create_lockfile .lock

		if [ "${LB_USE_FAKEROOT}" != "true" ]
		then
			# Create mountpoint
			mkdir -p chroot/sys

			# Mounting /sys
			mount sysfs-live -t sysfs chroot/sys
		else
			rm -rf chroot/sys
			ln -s /sys chroot/
		fi

		# Creating stage file
		Create_stagefile .build/chroot_sysfs
		;;

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

		# Checking lock file
		Check_lockfile .lock

		# Creating lock file
		Create_lockfile .lock

		if [ "${LB_USE_FAKEROOT}" != "true" ]
		then
			# Unmounting /sys
			#fuser -km chroot/sys
			if [ -e chroot/sys/class ]
			then
				umount chroot/sys
			fi
		else
			rm -rf chroot/sys
			mkdir -p chroot/sys
		fi

		# Removing stage file
		rm -f .build/chroot_sysfs
		;;

	*)
		Usage
		;;
esac