[type/__localdef] Also check for aliases in state explorer

cdist/conf/type/__localedef/explorer/state

@@ -25,8 +25,14 @@
 #    the main locale (and possibly aliases) is present
 #  absent:
 #    neither the main locale nor any aliases are present
+#  alias-present:
+#    the main locale is absent, but at least one of its aliases is present
 #
 
+# Hardcoded, create a pull request in case it is at another location for
+# some other distro. (cf. gencode-remote)
+aliasfile='/usr/share/locale/locale.alias'
+
 command -v locale >/dev/null 2>&1 || exit 0
 
 locales=$(locale -a)
@@ -68,4 +74,27 @@ locale_available() (
 	}
 )
 
-locale_available "${__object_id:?}" && echo present || echo absent
+if locale_available "${__object_id:?}"
+then
+	echo present
+else
+	# NOTE: locale.alias can be symlinked.
+	if test -e "${aliasfile}"
+	then
+		# Check if one of the aliases of the locale is defined
+		baselocale=$(
+			parse_locale "${__object_id:?}" _lang _codeset _modifiers \
+			&& format_locale "${_lang}" "${_codeset}")
+		while read -r _alias _localename
+		do
+			if test "${_localename}" = "${baselocale}" \
+				&& echo "${locales}" | grep -qxF "${_alias}"
+			then
+				echo alias-present
+				exit 0
+			fi
+		done <"${aliasfile}"
+	fi
+
+	echo absent
+fi

cdist/conf/type/__localedef/gencode-remote

@@ -94,9 +94,12 @@ in
 				        localedef --delete-from-archive "\${_alias}"
 				    fi
 				done <'${aliasfile}'
-
-				localedef --delete-from-archive '${main_localename}'
 				EOF
+
+				if test "${state_is}" = present
+				then
+					printf "localedef --delete-from-archive '%s'\n" "${main_localename}"
+				fi
 				;;
 		esac
 		;;