move script param capture to before arg processing

makes them consistent with other similar script-specific param handling;
saves the arg processing from dealing with it.

Gbp-Dch: Short

scripts/build/bootstrap_cache

@@ -18,6 +18,14 @@ set -e
 DESCRIPTION="Cache bootstrap stage"
 USAGE="${PROGRAM} [--force]"
 
+_ACTION="${1}"
+shift
+
+if ! In_list "${_ACTION}" restore save; then
+	Echo_error "Invalid action parameter"
+	exit 1
+fi
+
 # Processing arguments and configuration files
 Init_config_data "${@}"
 
@@ -28,14 +36,6 @@ if ! In_list "bootstrap" ${LB_CACHE_STAGES}; then
 	exit 0
 fi
 
-_ACTION="${1}"
-shift
-
-if ! In_list "${_ACTION}" restore save; then
-	Echo_error "Invalid action parameter"
-	exit 1
-fi
-
 # Set non-default stage file name
 # Note, this (plus the applicable extension added below) must match that used in `bootstrap_debootstrap`
 STAGE_FILE="bootstrap_cache.${_ACTION}"

scripts/build/chroot_cache

@@ -18,6 +18,9 @@ set -e
 DESCRIPTION="Cache chroot stage"
 USAGE="${PROGRAM} [--force]"
 
+_ACTION="${1}"
+shift
+
 # Processing arguments and configuration files
 Init_config_data "${@}"
 
@@ -26,9 +29,6 @@ then
 	exit 0
 fi
 
-_ACTION="${1}"
-shift
-
 # Set non-default stage file name
 # Setting to default name with appended action name
 STAGE_FILE="$(Stagefile_name "${_ACTION}")"