format-disk.sh: fix conditions, arguments passed to nix

disko/format-disk.sh

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-useConfig=false config="" ceph=true luks=true zfs=true
+useConfig=false config='""' ceph=true luks=true zfs=true
 
 cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null || exit 1
 
@@ -29,6 +29,7 @@ while [[ $# -gt 0 ]]; do
       ;;
     "--disk")
       disk=$2
+      shift
       ;;
     "--no-ceph") ceph=false;;
     "--no-luks") luks=false;;
@@ -41,7 +42,8 @@ while [[ $# -gt 0 ]]; do
   shift
 done
 
-if [[ -z ${name:-} || (-n ${config:-} && -n ${disk:-}) ]]; then
+if [[ -z ${name:-} && (-n ${config:-} || -n ${disk:-}) ]]; then
+  echo $name $config $disk
   # echo "--name and either config or disk must be supplied!"
   echo "--name and disk must be supplied!"
   exit 1