- if [ -r $target/etc/resolvconf/run/resolv.conf ] ; then
- cat /etc/resolv.conf >> $target/etc/resolvconf/run/resolv.conf
- else
- cat /etc/resolv.conf >> $target/etc/resolv.conf
- fi
+ case "$(readlink -f ${target}/etc/resolv.conf)" in
+ /run/*) # resolvconf with /run
+ mkdir -p $target/run/resolvconf
+ cat /etc/resolv.conf >> $target/run/resolvconf/resolv.conf
+ ;;
+ /lib/*) # resolvconf without /run
+ # sanity check to avoid "input file is output file",
+ # see http://bts.grml.org/grml/issue984
+ if ! [ -L $target/etc/resolvconf/run/resolv.conf ] ; then
+ cat /etc/resolv.conf >> $target/etc/resolvconf/run/resolv.conf
+ else
+ echo "Error: /etc/resolvconf/run/resolv.conf in chroot should not be a symlink." >&2
+ echo " Looks like something is wrong, please fix manually." >&2
+ exit 1
+ fi
+ ;;
+ *) # no resolvconf
+ if ! [ -L $target/etc/resolv.conf ] ; then
+ cat /etc/resolv.conf >> $target/etc/resolv.conf
+ else
+ echo "Error: /etc/resolv.conf in chroot should not be a symlink (resolvconf not installed)." >&2
+ exit 1
+ fi
+ ;;
+ esac