saving uncommitted changes in /etc prior to emerge run

etckeeper/commit.d/50vcs-commit

@@ -0,0 +1,113 @@
+#!/bin/sh
+set -e
+
+cleanup () {
+	if [ -n "$logfile" ]; then
+		rm -f "$logfile"
+	fi
+}
+if [ -n "$1" ]; then
+	trap cleanup EXIT
+	logfile="$(mktemp -t etckeeper-$VCS.XXXXXXXXXX)"
+	if [ "x$1" = "x--stdin" ]; then
+		cat > "$logfile"
+	else
+		if [ "x$1" = "x-m" ]; then
+			shift 1
+		fi
+		echo "$1" > "$logfile"
+	fi
+else
+	logfile=""
+fi
+
+hostname=`hostname`
+hostname="${hostname%%.*}"
+dnsdomainname=`dnsdomainname 2>/dev/null || true`
+if [ -n "$dnsdomainname" ]; then
+	hostname="$hostname.$dnsdomainname"
+fi
+
+USER=
+if [ -n "$SUDO_USER" ]; then
+	USER="$SUDO_USER"
+else
+	# try to check tty ownership, in case user su'd to root
+	TTY="$(tty 2>/dev/null || true)"
+	if [ -n "$TTY" ] && [ -c "$TTY" ]; then
+		USER="$(find "$TTY" -printf "%u")"
+	fi
+fi
+
+if [ "$VCS" = git ] && [ -d .git ]; then
+	if [ -n "$USER" ]; then
+		# Use user.name and user.email from the gitconfig belonging
+		# to the user who became root.
+		USER_HOME="$(perl -e 'print ((getpwnam(shift()))[7])' "$USER")"
+		if [ -n "$USER_HOME" ] && [ -e "$USER_HOME/.gitconfig" ]; then
+			if [ -z "$GIT_AUTHOR_NAME" ]; then
+				GIT_AUTHOR_NAME="$(git config -f "$USER_HOME/.gitconfig" user.name)" || true
+				export GIT_AUTHOR_NAME
+			fi
+			if [ -z "$GIT_AUTHOR_EMAIL" ]; then
+				GIT_AUTHOR_EMAIL="$(git config -f "$USER_HOME/.gitconfig" user.email)" || true
+				export GIT_AUTHOR_EMAIL
+			fi
+		fi
+		if [ -z "$GIT_COMMITTER_EMAIL" ]; then
+			GIT_COMMITER_EMAIL="$(git config --global user.email)" || true
+			export GIT_COMMITER_EMAIL
+		fi
+
+		if [ -z "$GIT_AUTHOR_NAME" ]; then
+			GIT_AUTHOR_NAME="$USER"
+			export GIT_AUTHOR_NAME
+		fi
+		if [ -z "$GIT_AUTHOR_EMAIL" ]; then
+			GIT_AUTHOR_EMAIL="$USER@$hostname"
+			export GIT_AUTHOR_EMAIL
+		fi
+		if [ -z "$GIT_COMMITTER_EMAIL" ]; then
+			GIT_COMMITTER_EMAIL=`whoami`"@$hostname"
+			export GIT_COMMITTER_EMAIL
+		fi
+	fi
+	if [ -n "$logfile" ]; then
+		git commit $GIT_COMMIT_OPTIONS -F "$logfile"
+	else
+		git commit $GIT_COMMIT_OPTIONS
+	fi
+elif [ "$VCS" = hg ] && [ -d .hg ]; then
+	if [ -n "$USER" ]; then
+		LOGNAME="$USER"
+		export LOGNAME
+	fi
+	if [ -z "$HGUSER" ]; then
+		HGUSER="$USER@$hostname"
+		export HGUSER
+	fi
+	if [ -n "$logfile" ]; then
+		hg commit $HG_COMMIT_OPTIONS -l "$logfile"
+	else
+		hg commit $HG_COMMIT_OPTIONS
+	fi
+elif [ "$VCS" = bzr ] && [ -d .bzr ]; then
+	if [ -z "$EMAIL" ] && [ -n "$USER" ]; then
+		EMAIL="$USER <$USER@$hostname>"
+		export EMAIL
+	fi
+	if [ -n "$logfile" ]; then
+		bzr commit $BZR_COMMIT_OPTIONS -F "$logfile"
+	else
+		bzr commit $BZR_COMMIT_OPTIONS
+	fi
+elif [ "$VCS" = darcs ] && [ -d _darcs ]; then
+	if [ -z "$USER" ]; then
+		USER=root
+	fi
+	if [ -n "$logfile" ]; then
+		darcs record --author="$USER" $DARCS_COMMIT_OPTIONS --logfile="$logfile"
+	else
+		darcs record --author="$USER" $DARCS_COMMIT_OPTIONS
+	fi
+fi