update explorer for __package_apt and install only if not already installed (same for deinstall)

Signed-off-by: Nico Schottelius <nico@kr.ethz.ch>

conf/manifest/init

@@ -28,5 +28,6 @@ case "$__target_host" in
    # Real machines
    ikq*)
       __package_apt zsh --state installed
+      __package_apt apache2 --state deinstalled
    ;;
 esac

conf/type/__package_apt/explorer/pkg_status

@@ -27,4 +27,5 @@ else
    name="$__object_id"
 fi
 
-dpkg -l "$name" 2>/dev/null | awk '{ print $1 }'
+# Except dpkg failing, if package is not known / installed
+dpkg -s "$name" 2>/dev/null || exit 0

conf/type/__package_apt/gencode

@@ -29,15 +29,18 @@ fi
 
 state="$(cat "$__object/parameter/state")"
 
+is_installed="$(grep "^Status: install ok installed" "$__object/explorer/pkg_status")"
+
 case "$state" in
    installed)
-      pkg_status="$(cat "$__object/explorer/pkg_status")"
-      if [ "$pkg_status" != "ii" ]; then
+      # Install only if non-existent
+      if [ -z "$is_installed" ]; then
          echo apt-get --quiet --yes install \"$name\"
       fi
    ;;
    deinstalled)
-      if [ "$pkg_status" != "un" ]; then
+      # Remove only if existent
+      if [ -n "$is_installed" ]; then
          echo apt-get --quiet --yes remove \"$name\"
       fi
    ;;