implemented some sugestions from nico

cdist/conf/type/__package_emerge/gencode-remote

@@ -27,36 +27,32 @@ else
    name="$__object_id"
 fi
 
-if [ -f "$__object/parameter/state" ]; then
-   state_should="$(cat "$__object/parameter/state")"
-else
-   state_should="present"
-fi
+state_should="$(cat "$__object/parameter/state")"
 
-if [ -f "$__object/parameter/version" ]; then
-    version="$(cat "$__object/parameter/version")"
-else
-    version=""
-fi
+version="$(cat "$__object/parameter/version")"
 
-if [ ! -z "$version" ]; then
+if [ -n "$version" ]; then
     name="=$name-$version"
 fi
 
 pkg_version="$(cat "$__object/explorer/pkg_version")"
 if [ -z "$pkg_version" ]; then
     state_is="absent"
-elif [ ! -z "$version" -a $(echo "$pkg_version" | wc -l) -gt 1 ]; then
+elif [ -z "$version" -a $(echo "$pkg_version" | wc -l) -gt 1 ]; then
     echo "Package name is not unique! The following packages are installed:"
     echo "$pkg_version"
     exit 1
-elif [ -z "$version" -a $(echo "$pkg_version" | cut -d " " -f 1 | sort | uniq | wc -l) -gt 1 ]; then
+elif [ -n "$version" -a $(echo "$pkg_version" | cut -d " " -f 1 | sort | uniq | wc -l) -gt 1 ]; then
     echo "Package name is not unique! The following packages are installed:"
     echo "$pkg_version"
     exit 1
 else
     state_is="present"
-    installed_version="$(echo "$pkg_version" | cut -d " " -f 2 | tail -n 1)"
+    if [ -n "$version" ] && echo "$pkg_version" | cut -d " " -f 2 | grep -q -x "$version"; then
+        installed_version="$(echo "$pkg_version" | cut -d " " -f 2 | grep -x "$version")"
+    else
+        installed_version="$(echo "$pkg_version" | cut -d " " -f 2 | tail -n 1)"
+    fi
 fi
 
 
@@ -64,6 +60,7 @@ fi
 [ "$state_is" = "$state_should" ] && ( [ -z "$version" ] || [ "$installed_version" = "$version" ] ) && exit 0
 [ "$state_should" = "absent" ] && [ ! -z "$version" ] && [ "$installed_version" != "$version" ] && exit 0
 
+
 case "$state_should" in
    present)
         echo "emerge \"$name\" &>/dev/null || exit 1"

cdist/conf/type/__package_emerge/parameter/default/state

@@ -0,0 +1 @@
+present