live-build/scripts/build/binary_chroot

#!/bin/sh

## live-build(7) - System Build Scripts
## Copyright (C) 2016-2020 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="Copy chroot into chroot"
USAGE="${PROGRAM} [--force]"

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

Echo_message "Begin copying chroot..."

# Requiring stage file
Require_stagefiles config bootstrap

# Checking stage file
Check_stagefile

# Acquire lock file
Acquire_lockfile

# Normally, virtual filesystems are not mounted here, but people tend to be lazy
if [ -f chroot/proc/version ]
then
	umount chroot/proc
fi

if [ -d chroot/sys/kernel ]
then
	umount chroot/sys
fi

if [ "${LB_BUILD_WITH_CHROOT}" = "false" ]
then
	Create_stagefile
	exit 0
fi

if [ "${LB_CACHE}" = "true" ] && Find_files cache/binary_rootfs/filesystem*
then
	Create_stagefile
	exit 0
fi

Echo_message "This may take a while."

# Removing old chroot
rm -rf chroot/chroot
rm -rf chroot.tmp

# Copying new chroot
if [ -d cache/bootstrap ] && [ "${LB_CHROOT_FILESYSTEM}" != "none" ]
then
	mv chroot chroot.tmp
	cp -a cache/bootstrap chroot
	touch chroot/chroot.cache
else
	cp -a chroot chroot.tmp
fi

mv chroot.tmp chroot/chroot

# Handling chroot excludes
if [ -f config/rootfs/excludes ] && [ "${LB_CHROOT_FILESYSTEM}" != "squashfs" ]
then
	case "${LB_BUILD_WITH_CHROOT}" in
		true)
			cp config/rootfs/excludes chroot/chroot/excludes
			# Not using Chroot() here because we want explicitly /bin/bash (for the time being)
			chroot chroot/chroot /usr/bin/env -i xargs --arg-file=/excludes -I FILE bash -c 'rm -rf FILE'
			rm -f chroot/chroot/excludes
			;;

		false)
			cp config/rootfs/excludes chroot/excludes
			# Not using Chroot() here because we want explicitly /bin/bash (for the time being)
			chroot chroot /usr/bin/env -i xargs --arg-file=/excludes -I FILE bash -c 'rm -rf FILE'
			rm -f chroot/excludes
			;;
	esac
fi

# Creating stage file
Create_stagefile