#!/bin/sh
#
# /usr/local/sbin/aptdpkgclean
# Put together and tweaked by Jonas Smedegaard <dr@jones.dk>
# 2001-2002
#
# $Id: aptdpkgclean,v 1.1 2002-03-07 16:22:51 jonas Exp $
#
# Auto re-mounting of a readonly /usr
# Put the following in a file below /etc/apt/apt.conf.d:
#
# // Auto re-mounting of a readonly /usr
# // Based on mail from Anthony Towns <aj@azure.humbug.org.au>
# // http://lists.debian.org/debian-devel/2001/debian-devel-200111/msg00212.html
# 
# // This is the intended thing:
# // DPkg {
# // 	Pre-Invoke {"mount -o remount,rw /usr";};
# // 	Post-Invoke {"mount -o remount,ro /usr";};
# // };
# 
# DPkg {
# 	Pre-Install-Pkgs {"/usr/local/sbin/aptdpkgro";};
# 	Pre-Invoke {"mount -o remount,rw /usr";};
# 	Post-Invoke {"/usr/local/sbin/aptdpkgclean; mount -o remount,ro /usr";};
# };
#

pathmatch="^/usr"

cat /var/lib/my_ro_hack.todel | while read file; do
	[ -f "$file" ] || continue
	N1=`find "$file" -printf "%i\n"`

	b=`basename $file`; d=`dirname $file`
	XF="${b#.}"; XF="$d/${XF%.dpkg-ro-used.*}"
	N2=`find "$XF" -printf "%i\n"` || continue

	[ -n "$XF" ] || continue
	if [ "$N1" != "$N2" ] && ! fuser -s "$file"; then
		rm -f "$file"
	else
		echo "$file"
	fi
done >/var/lib/my_ro_hack.todel.new
mv /var/lib/my_ro_hack.todel.new /var/lib/my_ro_hack.todel