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#! /bin/bash perm_string_to_mode() { string="$1" let perms=0 [[ "${string}" = ?r???????? ]] && perms=$(( perms + 400 )) [[ "${string}" = ??w??????? ]] && perms=$(( perms + 200 )) [[ "${string}" = ???x?????? ]] && perms=$(( perms + 100 )) [[ "${string}" = ???s?????? ]] && perms=$(( perms + 4100 )) [[ "${string}" = ???S?????? ]] && perms=$(( perms + 4000 )) [[ "${string}" = ????r????? ]] && perms=$(( perms + 40 )) [[ "${string}" = ?????w???? ]] && perms=$(( perms + 20 )) [[ "${string}" = ??????x??? ]] && perms=$(( perms + 10 )) [[ "${string}" = ??????s??? ]] && perms=$(( perms + 2010 )) [[ "${string}" = ??????S??? ]] && perms=$(( perms + 2000 )) [[ "${string}" = ???????r?? ]] && perms=$(( perms + 4 )) [[ "${string}" = ????????w? ]] && perms=$(( perms + 2 )) [[ "${string}" = ?????????x ]] && perms=$(( perms + 1 )) [[ "${string}" = ?????????t ]] && perms=$(( perms + 1001 )) [[ "${string}" = ?????????T ]] && perms=$(( perms + 1000 )) echo $perms } # generate a list of installed packages that have files etc in /var grep -l /var/ /var/lib/dpkg/info/*.list | \ sed -e 's:/var/lib/dpkg/info/::' -e 's/\.list$//' | \ xargs dpkg -l | \ awk '/^[hi]/ {print $2}' > /tmp/packages.list # clean out the apt cache, so we only have one version of each package apt-get clean # download the packages as if we were going to reinstall them # NOTE: packages which are no longer available for download # will not have their permissions fixed. apt-get will complain about # those packages, so you can get a list by redirecting or tee-ing the # output of this script. xargs apt-get -y -d -u --reinstall install < /tmp/packages.list for pkg in $(cat /tmp/packages.list) ; do PKGFILE="/var/cache/apt/archives/${pkg}_*.deb" if [ -e $PKGFILE ] ; then dpkg-deb -c /var/cache/apt/archives/${pkg}_*.deb | \ awk '/\.\/var\// {print $1, $2, $6}' | \ sed -e 's/ /\t/' -e 's/ /\t' | \ while IFS=$'\t' read permstring ownergroup filename ; do # don't change owner/group/perms on symlinks if ! [[ "${permstring}" =~ ^l ]] ; then mode=$(perm_string_to_mode $permstring) # change "owner/group" to "owner:group" for chown ownergroup=${ownergroup//\//:} # remove leading '.' from filename filename=${filename#?} cat <<__EOF__ chown "$ownergroup" "$filename" chmod "$mode" "$filename" __EOF__ fi done echo fi done fi