Fix shellcheck issues

cdist/conf/type/__package_update_index/explorer/currage

@@ -24,18 +24,18 @@ case "$type" in
         if [ -f "/var/cache/apt/pkgcache.bin" ]; then
             echo $(($(date +"%s")-$(stat --format '%Y' /var/cache/apt/pkgcache.bin)))
         else
-            echo -1
+            echo -- -1
         fi
         ;;
     pacman)
         if [ -d "/var/lib/pacman/sync" ]; then
             echo $(($(date +"%s")-$(stat --format '%Y' /var/lib/pacman/sync)))
         else
-            echo -1
+            echo -- -1
         fi
         ;;
     alpine)
-        echo -1
+        echo -- -1
         ;;
     *)  echo "Your specified type ($type) is currently not supported." >&2
         echo "Please contribute an implementation for it if you can." >&2

cdist/conf/type/__pyvenv/gencode-remote

@@ -38,7 +38,7 @@ destination="/$__object_id"
 venvparams="$(cat "$__object/parameter/venvparams")"
 pyvenvparam="$__object/parameter/pyvenv"
 
-os=$(cat $__global/explorer/os)
+os=$(cat "$__global/explorer/os")
 
 if [ -f "$pyvenvparam" ]
 then