handle resolv.conf

Signed-off-by: Steven Armstrong <steven@icarus.ethz.ch>

cdist/conf/type/__install_config/gencode-local

@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# 2011 Steven Armstrong (steven-cdist at armstrong.cc)
+# 2011-2016 Steven Armstrong (steven-cdist at armstrong.cc)
 #
 # This file is part of cdist.
 #
@@ -25,6 +25,16 @@ remote_copy="$__type/files/remote/copy"
 cdist_args="-v"
 [ "$__debug" = "yes" ] && cdist_args="$cdist_args -d"
 
+
+cat << DONE
+$__remote_exec $__target_host << EOSSH
+if [ ! -f "${chroot}/etc/resolv.conf" ]; then
+   touch "${chroot}/etc/resolv.conf"
+fi
+mount --bind -o ro /etc/resolv.conf "${chroot}/etc/resolv.conf"
+EOSSH
+DONE
+
 cat << DONE
 cdist $cdist_args \
    config \
@@ -32,3 +42,16 @@ cdist $cdist_args \
    --remote-copy="$remote_copy $chroot" \
    $__target_host
 DONE
+
+cat << DONE
+$__remote_exec $__target_host << EOSSH
+if mountpoint -q "${chroot}/etc/resolv.conf";
+   umount "${chroot}/etc/resolv.conf"
+fi
+if [ -f "${chroot}/etc/resolv.conf" -a ! -s "${chroot}/etc/resolv.conf" ]; then
+   # file exists but is empty which means we created it or it's useless anyway
+   rm "${chroot}/etc/resolv.conf"
+fi
+
+EOSSH
+DONE