distr_info: add --debian-arch

bin/distr_info

@@ -403,20 +403,28 @@ esac
 echo "$DIST_ARCH"
 }
 
-get_distro_arch()
+get_debian_arch()
 {
     local arch="$(get_arch)"
-    case "$(pkgtype)" in
-        rpm)
-            :
-            ;;
-        deb)
     case $arch in
     'i586')
         arch='i386' ;;
     'x86_64')
         arch='amd64' ;;
     esac
+    echo "$arch"
+}
+
+get_distro_arch()
+{
+    local arch="$(get_arch)"
+    case "$(pkgtype)" in
+        rpm)
+            :
+            ;;
+        deb)
+            get_debian_arch
+            return
             ;;
     esac
     echo "$arch"
@@ -614,6 +622,12 @@ case $1 in
 		get_distro_arch
 		exit 0
 		;;
+	--debian-arch)
+		# override DISTRIB_ID
+		test -n "$2" && DISTRIB_ID="$2"
+		get_debian_arch
+		exit 0
+		;;
 	-d)
 		echo $DISTRIB_ID
 		;;