setup-chroot

#!/bin/bash
export INSTANCE=$$
umask 022

state_checks()
{
	test $(id -u) -ne 0 && echo "please run as root" && exit 1
	test ! -e setup-chroot  && echo "This utility must be run in the directory in which it exists." && exit 1
	test "$PWD" == "/" && echo "You have already started the session." && exit 1
	test ! -d var/lib/pkg && ts/bin/install_chroot
}

help()
{
	echo -e "
	This script sets up the environment to work well with build. On it's initial run, it
	will decompress all the packages necessary to develop and build images. It will
	also populate the ts build env with any files that it needs. If the setup is already
	completed, it will only take you into the chroot env for building. You will need to 'exit'
	this env when you are done working in it. It takes the following options.

	-a : Automaticly download and build during unwind.
	-h : Show this help message.
	-i : Install the env only. Don't enter it after-wards.
	-b : Run build after entering chroot and exit after-wards.
	-o : Options to pass to build. Must be the last option,
	     as anything after it will be passed to build.
	-c : Clean the chroot env.
	-e : Execute a command after entering chroot. Must
	     be the last option, as anything after it will be
	     executed in the chroot, including arguments.
	-k : Try and import ssh keys.

	"
}

get_opts()
{
	until [ -z "$1" ] ; do
		case $1 in
		-a|--autodl)	export autodl=true;;
		-i|--install)	install_only=true; export autodl=true;;
		-b|--build)	export build=true ;;
		-h|--help)	help ; exit 255 ;;
		-o|--options)	shift ; export build_opts=$@ ; shift $# ;;
		-c|--clean)	unset build exec_cmd; shift $# ; export clean=true ;;
		-e|--exec)	shift ; export exec_cmd=$@ ; shift $# ;;
		-u|--user)	shift ; export chuser=$1 ;;
		-k|--keys)	shift ; export keys=true;;
		*)		echo "Invalid Argument: $1" ; help ; exit 255 ;;
		esac
		shift
	done
	get_gnome_proxy
	set_proxy
}

first_or_last()
{
	sessions="`ps x -o pid,ppid,comm |grep -e 'setup-chroot' |grep -v grep |grep -v $INSTANCE -c`"
	return $sessions
}

get_gnome_proxy()
{
	if which gconftool-2 &>/dev/null; then
		mode=`gconftool-2 -g /system/proxy/mode 2>/dev/null`
		use_http_proxy=`gconftool-2 -g /system/http_proxy/use_http_proxy 2>/dev/null`
		use_same_proxy=`gconftool-2 -g /system/http_proxy/use_same_proxy 2>/dev/null`
		use_authentication=`gconftool-2 -g /system/http_proxy/use_authentication 2>/dev/null`
		authentication_user=`gconftool-2 -g /system/http_proxy/authentication_user 2>/dev/null`
		authentication_password=`gconftool-2 -g /system/http_proxy/authentication_password 2>/dev/null`
		host=`gconftool-2 -g /system/http_proxy/host 2>/dev/null`
		port=`gconftool-2 -g /system/http_proxy/port 2>/dev/null`
		ignore_hosts=`gconftool-2 -g /system/http_proxy/ignore_hosts 2>/dev/null`
		socks_host=`gconftool-2 -g /system/proxy/socks_host 2>/dev/null`
		socks_port=`gconftool-2 -g /system/proxy/socks_port 2>/dev/null`
		secure_host=`gconftool-2 -g /system/proxy/secure_host 2>/dev/null`
		secure_port=`gconftool-2 -g /system/proxy/secure_port 2>/dev/null`
		ftp_host=`gconftool-2 -g /system/proxy/ftp_host 2>/dev/null`
		ftp_port=`gconftool-2 -g /system/proxy/ftp_port 2>/dev/null`
	fi
        if [ -z "$use_authentication" ]; then use_authentication=false ; fi
}

set_proxy()
{
	if [ "$mode" == "manual" ]; then
		if $use_http_proxy && [ -n "$host" ] && [ -n "$port" ] ; then
			no_proxy=`echo "$ignore_hosts" |sed -e 's/\[//g' |sed -e 's/\]//g'`
			export no_proxy
			if $use_authentication; then
				if [ -n "$authentication_user" ] && [ -n "$authentication_password" ]; then
					PROXY_AUTH="$authentication_user:$authentication_password"
				elif [ -n "$authentication_user" ]; then
					PROXY_AUTH="$authentication_user"
				fi
				export http_proxy=http://${PROXY_AUTH}@$host:$port
				if [ -n "$ftp_host" ] && [ -n "$ftp_port" ]; then
					export ftp_proxy=http://${PROXY_AUTH}@$ftp_host:$ftp_port
				fi
				if [ -n "$secure_host" ] && [ -n "$secure_port" ]; then
					export https_proxy=https://${PROXY_AUTH}@$secure_host:$secure_port
				fi
			else
				if [ -n "$ftp_host" ] && [ -n "$ftp_port" ]; then
					export ftp_proxy=http://$ftp_host:$ftp_port
				fi
				export http_proxy=http://$host:$port
				if [ -n "$secure_host" ] && [ -n "$secure_port" ]; then
					export https_proxy=https://$secure_host:$secure_port
				fi
			fi
		fi
	fi
}

mounted()
{
	if [ "`cat /proc/mounts |grep -e \"$PWD\"/$1 -c`" -ne "0" ]; then
		return 0
	else
		return 1
	fi
}

do_mounts()
{
	if ! mounted dev ; then mount --bind /dev dev ; fi
	if ! mounted tmp ; then mount -t tmpfs /tmp tmp ; fi
	if ! mounted proc ; then mount -t proc proc proc ; fi
	if ! mounted sys ; then mount -t sysfs none sys ; fi
	if ! mounted dev/pts ; then mount --bind /dev/pts dev/pts ; fi
	if [ -e /run/pcscd ]; then
		if ! mounted run/pcscd ; then
			mkdir -p run/pcscd
			mount --bind /run/pcscd run/pcscd
		fi
	elif [ -e /var/run/pcscd ]; then
		if ! mounted run/pcscd ; then
			mkdir -p run/pcscd
			mount --bind /var/run/pcscd run/pcscd
		fi
	fi
	if [ -e /run/user/0 ]; then
		if ! mounted run/user/0; then
			mkdir -p run/user/0
			mount --bind /run/user/0 run/user/0
		fi
	fi
	if [ -n "$SUDO_UID" ]; then
		if ! mounted run/user/$SUDO_UID; then
			mkdir -p run/user/$SUDO_UID
			mount --bind /run/user/$SUDO_UID run/user/$SUDO_UID
		fi
	fi
}

copy_host_essential()
{
	cp -f /etc/resolv.conf etc/resolv.conf
	if ${keys:=false}; then
		if [ -e ~/.ssh ]; then
			mkdir -p root
			cp -Prfd ~/.ssh	root/.
		fi
	fi
}

launch_chroot()
{
	do_mounts
	if first_or_last; then
		copy_host_essential
		if which dbus-uuidgen > /dev/null; then
			mkdir -p var/lib/dbus
			dbus-uuidgen --get > var/lib/dbus/machine-id
		fi
	fi
	if [ -n "$chuser" ]; then
		chroot_cmd="chroot --userspec=$chuser"
	else
		chroot_cmd="chroot"
	fi
	$chroot_cmd "$PWD" /ts/TS_ENV
	howdiditgo=$?
	if ${keys:=false}; then
		kill_ssh_agent
		secure_keys
	fi
	if first_or_last ; then
		do_unmounts
		if [ -e cleanstage2 ] ; then
			ts/bin/clean_chroot
		fi
	fi
}

kill_ssh_agent()
{
	if [ -f root/.agent.env ] ; then
		. root/.agent.env > /dev/null
		kill -9 $SSH_AGENT_PID > /dev/null 2>&1
	fi
}

secure_keys()
{
	if [ -e root/.ssh ]; then
		rm -rf root/.ssh
	fi
}

do_unmounts()
{
	for mount in dev/pts dev tmp proc sys run/pcscd run/user/0 run/user/$SUDO_UID; do
		while mounted $mount ; do
			umount -l $mount
			if mounted $mount; then
				fuser -kv "$PWD/$mount" > /dev/null 2>&1
			fi
		done
	done
}

main()
{
	get_opts $@
	state_checks
	launch_chroot
	if [ -e dostage4 ] ; then
		copy_host_essential
		launch_chroot
	fi
	if [ -e installed ] ; then
		rm installed
		if [ "$install_only" == "true" ] ; then
			exit 0
		else
			copy_host_essential
			launch_chroot
		fi
	fi
}

trap "do_unmounts; exit 1" SIGINT SIGHUP SIGTERM
main $@
if [ "$howdiditgo" == "0" ] ; then echo -e "\nGoodbye. \n" ; fi
exit $howdiditgo