dpkg-1.16.1.1/dselect/methods/disk/update

#!/bin/sh

set -e
vardir="$1"
method=$2
option=$3

cd "$vardir/methods/disk"

. ./shvar.$option

if [ -z "$p_main_packages" ] && [ -z "$p_ctb_packages" ] && \
   [ -z "$p_nf_packages" ] && [ -z "$p_nus_packages " ] && \
   [ -z "$p_lcl_packages" ]
then
	echo '
No Packages files available, cannot update available packages list.
Hit RETURN to continue.  '
	read response
	exit 0
fi

xit=1
trap '
	rm -f packages-main packages-ctb packages-nf packages-nus packages-lcl
	if [ -n "$umount" ]
	then
		umount "$umount" >/dev/null 2>&1
	fi
	exit $xit
' 0

if [ -n "$p_blockdev" ]
then
	umount="$p_mountpoint"
	mount -rt "$p_fstype" -o nosuid,nodev "$p_blockdev" "$p_mountpoint"
fi

if [ -n "$p_nfs" ]
then
	umount="$p_mountpoint"
	mount -rt nfs "$p_nfs" -o nosuid,nodev "$p_mountpoint"
fi

updatetype=update

for f in main ctb nf nus lcl
do
	eval 'this_packages=$p_'$f'_packages'
	case "$this_packages" in
	'')
		continue
		;;
	scan)
		eval 'this_binary=$p_'$f'_binary'
		if [ -z "$this_binary" ]; then continue; fi
		if [ "$updatetype" = update ]
		then
			dpkg --admindir $vardir --clear-avail
			updatetype=merge
		fi
		echo Running dpkg --record-avail -R "$p_mountpoint$this_binary"
		dpkg --admindir $vardir --record-avail -R "$p_mountpoint$this_binary"
		;;
	*)
		packagesfile="$p_mountpoint$this_packages"
		case "$packagesfile" in
		*.gz | *.Z | *.GZ | *.z)
			echo -n "Uncompressing $packagesfile ... "
			zcat <"$packagesfile" >packages-$f
			echo done.
			dpkg --admindir $vardir --$updatetype-avail packages-$f
			updatetype=merge
			;;
		'')
			;;
		*)
			dpkg --admindir $vardir --$updatetype-avail "$packagesfile"
			updatetype=merge
			;;
		esac
		;;
	esac	
done

echo -n 'Update OK.  Hit RETURN.  '
read response

xit=0