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/usr/lib/live/build/chroot_proc is in open-infrastructure-system-build 20161101-lts2-2.

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The actual contents of the file can be viewed below.

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#!/bin/sh

## live-build(7) - System Build Scripts
## 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="$(Echo 'mount /proc')"
HELP=""
USAGE="${PROGRAM} {install|remove} [--force]"

Arguments "${@}"

# 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 /proc..."

		# Checking stage file
		Check_stagefile .build/chroot_proc

		# Checking lock file
		Check_lockfile .lock

		# Creating lock file
		Create_lockfile .lock

		# Creating mountpoint
		mkdir -p chroot/proc

		# Mounting /proc
		mount proc-live -t proc chroot/proc

		# Creating stage file
		Create_stagefile .build/chroot_proc
		;;

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

		# Checking lock file
		Check_lockfile .lock

		# Creating lock file
		Create_lockfile .lock

		# Workaround binfmt-support /proc locking
		if [ -e chroot/proc/sys/fs/binfmt_misc/status ]
		then
			umount chroot/proc/sys/fs/binfmt_misc
		fi

		# Unmounting /proc
		if [ -e chroot/proc/version ]
		then
			umount chroot/proc
		fi

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

	*)
		Usage
		;;
esac