~ubuntu-branches/ubuntu/hardy/debian-installer-utils/hardy-updates

#!/bin/sh -e

# Setup for using apt to install packages in /target.

mountpoints () {

	cut -d" " -f2 /proc/mounts | sort | uniq

}

chroot_setup () {

	# Bail out if directories we need are not there

	if [ ! -d /target/sbin ] || [ ! -d /target/usr/sbin ] || \

	   [ ! -d /target/proc ]; then

		return 1

	fi

	case $(uname -r | cut -d . -f 1,2) in

	    2.6)

		if [ ! -d /target/sys ] ; then

			return 1

		fi

		;;

	esac

	if [ -e /var/run/chroot-setup.lock ]; then

		cat >&2 <<EOF

apt-install or in-target is already running, so you cannot run either of

them again until the other instance finishes. You may be able to use

'chroot /target ...' instead.

EOF

		return 1

	fi

	touch /var/run/chroot-setup.lock

	# Create a policy-rc.d to stop maintainer scripts using invoke-rc.d 

	# from running init scripts. In case of maintainer scripts that don't

	# use invoke-rc.d, add a dummy start-stop-daemon.

	cat > /target/usr/sbin/policy-rc.d <<EOF

#!/bin/sh

exit 101

EOF

	chmod a+rx /target/usr/sbin/policy-rc.d

	if [ -e /target/sbin/start-stop-daemon ]; then

		mv /target/sbin/start-stop-daemon /target/sbin/start-stop-daemon.REAL

	fi

	cat > /target/sbin/start-stop-daemon <<EOF

#!/bin/sh

echo 1>&2

echo 'Warning: Fake start-stop-daemon called, doing nothing.' 1>&2

exit 0

EOF

	chmod a+rx /target/sbin/start-stop-daemon

	# Record the current mounts

	mountpoints > /tmp/mount.pre

	# Some packages (eg. the kernel-image package) require a mounted

	# /proc/. Only mount it if not mounted already

	if [ ! -f /target/proc/cmdline ] ; then

		mount -t proc proc /target/proc

	fi

	# For installing >=2.6.14 kernels we also need sysfs mounted

	# Only mount it if not mounted already and we're running 2.6

	case $(uname -r | cut -d . -f 1,2) in

	    2.6)

		if [ ! -d /target/sys/devices ] ; then

			mount -t sysfs none /target/sys

		fi

		;;

	esac

	# Try to enable proxy when using HTTP.

	# What about using ftp_proxy for FTP sources?

	RET=$(debconf-get mirror/protocol || true)

	if [ "$RET" = "http" ]; then

		RET=$(debconf-get mirror/http/proxy || true)

		if [ "$RET" ] ; then

			http_proxy="$RET"

			export http_proxy

		fi

	fi

	# Pass debconf priority through.

	DEBIAN_PRIORITY=$(debconf-get debconf/priority || true)

	export DEBIAN_PRIORITY

	LANG=$(debconf-get debian-installer/locale || true)

	export LANG

	export PERL_BADLANG=0

	# Unset variables that would make scripts in the target think

	# that debconf is already running there.

	unset DEBIAN_HAS_FRONTEND

	unset DEBIAN_FRONTEND

	unset DEBCONF_FRONTEND

	unset DEBCONF_REDIR

	# Avoid debconf mailing notes.

	DEBCONF_ADMIN_EMAIL=""

	export DEBCONF_ADMIN_EMAIL

	return 0

}

chroot_cleanup () {

	rm -f /target/usr/sbin/policy-rc.d

	mv /target/sbin/start-stop-daemon.REAL /target/sbin/start-stop-daemon

	# Undo the mounts done by the packages during installation.

	# Reverse sorting to umount the deepest mount points first.

	# Items with count of 1 are new.

	for dir in $( (cat /tmp/mount.pre /tmp/mount.pre; mountpoints ) | \

		     sort -r | uniq -c | grep "^[[:space:]]*1[[:space:]]" | \

		     sed "s/^[[:space:]]*[0-9][[:space:]]//"); do

		if ! umount $dir ; then

			logger -t $0 "warning: Unable to umount '$dir'"

		fi

	done

	rm -f /tmp/mount.pre

	rm -f /var/run/chroot-setup.lock

}