saving uncommitted changes in /etc prior to emerge run

etckeeper/pre-install.d/50uncommitted-changes

@@ -0,0 +1,29 @@
+#!/bin/sh
+set -e
+
+if [ "$1" = "fail-debconf" ]; then
+	. /usr/share/debconf/confmodule
+	db_subst etckeeper/commit_failed VCS "$VCS"
+	db_input critical etckeeper/commit_failed || true
+	db_go || true
+	db_reset etckeeper/commit_failed || true
+	exit 0
+fi
+
+if etckeeper unclean; then
+	if [ "$AVOID_COMMIT_BEFORE_INSTALL" = 1 ]; then
+		echo "" >&2
+		echo "** etckeeper detected uncommitted changes in /etc prior to $HIGHLEVEL_PACKAGE_MANAGER run" >&2 
+		echo "** Aborting $HIGHLEVEL_PACKAGE_MANAGER run. Manually commit and restart." >&2
+		echo "" >&2
+		exit 1
+	fi
+	if ! etckeeper commit "saving uncommitted changes in /etc prior to $HIGHLEVEL_PACKAGE_MANAGER run"; then
+		if [ -e /usr/share/debconf/confmodule ]; then
+			$0 fail-debconf
+		else
+			echo "error: etckeeper failed to commit changes in /etc using $VCS"
+			exit 1
+		fi
+	fi
+fi