diff --git a/module/common.sh b/module/common.sh
new file mode 100644
index 0000000..4b6e4bd
--- /dev/null
+++ b/module/common.sh
@@ -0,0 +1,135 @@
+#!/bin/bash
+#
+# common - module.sh
+#
+# Copyright 2019 Luigi Santivetti <luigi.santivetti@gmail.com>
+
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the "Software"),
+# to deal in the Software without restriction, including without limitation
+# the rights to use, copy, modify, merge, publish, distribute, sublicense,
+# and/or sell copies of the Software, and to permit persons to whom the
+# Software is furnished to do so, subject to the following conditions:
+
+# The above copyright notice and this permission notice (including the next
+# paragraph) shall be included in all copies or substantial portions of the
+# Software.
+
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+# ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+declare -r mod_module_d="$module_d/$module"
+declare -r mod_instance_d="$instance_d"
+declare -r mod_docker_d="$docker_d/$module"
+declare -r mod_rootfs_d="$rootfs_d"
+declare -r mod_mode_env="${module^^}_MODE"
+declare -r mod_mode="$(eval "echo \${$mod_mode_env:-$instance_mode}")"
+declare -r mod_staging_d="$mod_module_d/$staging"
+
+declare -ar mod_dirs=( $mod_instance_d $mod_docker_d $mod_rootfs_d )
+declare -ar mod_files=( )
+declare -ar mod_trefs=( )
+
+if [ "${mod_mode}" != "${debug}" ] && [ "${mod_mode}" != "${release}" ]; then
+	exit 1
+fi
+
+# @1      : module name
+# @2      : absolute path to module staging dir
+function __fetch_module_common
+{
+	local modname
+	local tmp_d
+	local tar
+
+	[ -z "$1" ] && {
+		[ -n "$module" ] || {
+			lets -l -e "invalid module"; return $s_err
+		}; modname="$module"
+	} || modname=$1
+
+	[ -z "$2" ] && {
+		[ -n "$mod_staging_d" ] && [ -d "$mod_module_d" ] || {
+			lets -l -e "invalid module root"; return $s_err
+		}; tmp_d="$mod_staging_d"
+	} || tmp_d=$2
+
+	is_unix_path $tmp_d || { lets -l -e "invalid staging area"; return $s_err; }
+
+	[ -d "$tmp_d" ] && {
+		lets --ask "${tmp_d##$module_d/} existing, wipe it?" && rm -rf $tmp_d || \
+				lets -l -w "keeping staging"
+	}
+
+	mkdir -p $tmp_d && process_manifest $modname $tmp_d || {
+
+			# Wipe the whole staging_d for this module
+			[ "$tmp_d" = "$mod_staging_d" ] && rm -rf $tmp_d
+			return $s_err
+		}
+}
+
+function __dir_do_common_helper
+{
+	local -a __a1=( )
+
+	if [ -z "${mod_more_dirs[*]}" ] || [ ${#mod_more_dirs[@]} -eq 0 ]; then
+		lets -l -w "$module: does not have more dirs"
+		__a1=( "${mod_dirs[@]}" )
+	else
+		__a1=( $(__merge_array "${mod_dirs[@]}" "${mod_more_dirs[@]}") )
+	fi
+
+	create_directory "${__a1[@]}" || return $s_err
+}
+
+function __file_do_common_helper
+{
+	local -a __a1=( ); local -a __a2=( )
+
+	if [ -z "${mod_more_files[*]}" ] || [ ${#mod_more_files[@]} -eq 0 ]; then
+		lets -l -w "$module: does not have more files"
+	else
+		__a1=( $(__merge_array "${mod_files[@]}" "${mod_more_files[@]}") )
+	fi
+
+	if [ -z "${mod_more_trefs[*]}" ] || [ ${#mod_more_trefs[@]} -eq 0 ]; then
+		lets -l -w "$module: does not have more templates"
+	else
+		__a2=( $(__merge_array "${mod_trefs[@]}" "${mod_more_trefs[@]}") )
+	fi
+
+	__file_do "$1" "$uninstall_f" "${__a1[@]}" "${__a2[@]}" || return $s_err
+}
+
+function __doins_module_common
+{
+	__dir_do_common_helper && __file_do_common_helper --create
+}
+
+function __watch_module_common
+{
+	__file_do_common_helper --splash
+}
+
+function __upins_module_common
+{
+	__dir_do_common_helper && __file_do_common_helper --update
+}
+
+function __clmod_module_common
+{
+	rm -rf $mod_staging_d || sudo rm -rf $mod_staging_d
+}
+
+function __clins_module_common
+{
+	local -a __a1=( ); local -a __a2=( )
+
+	__file_do --update \
+		"$uninstall_f" "${__a1[@]}" "${__a2[@]}" || return $s_err
+}