Add a trigger to (un)register shells from /etc/shells.

--HG--
extra : convert_revision : 6f82e9b19f880b388d5e800e1d159f4f3287ab26

triggers/register-shell

@@ -0,0 +1,58 @@
+#!/bin/sh
+#
+# Registers or unregisters a shell in /etc/shells.
+#
+# Arguments:	$1 = action [run/targets]
+#		$2 = target [post-install]
+#		$3 = pkgname
+#		$4 = version
+#
+trigger="register-shell"
+shells_file="./var/db/xbps/metadata/$3/shells"
+
+case "$1" in
+targets)
+	echo "post-install post-remove"
+	;;
+run)
+	[ "$2" != "post-install" -a "$2" != "post-remove" ] && exit 1
+	[ ! -f ${shells_file} ] && exit 1
+
+	echo "Running $trigger trigger..."
+
+	case "$2" in
+	post-install)
+		if [ ! -f ./etc/shells ]; then
+			cat ${shells_file} | while read line; do
+				echo $line >> ./etc/shells
+				echo "Registered $line into /etc/shells."
+			done
+			chmod 644 ./etc/shells
+		else
+			cat ${shells_file} | while read line; do
+				if ! grep -q $line ./etc/shells; then
+					echo $line >> ./etc/shells
+					echo "Registered $line into /etc/shells."
+				fi
+			done
+		fi
+		;;
+	post-remove)
+		if [ -f ./etc/shells ]; then
+			cat ${shells_file} | while read line; do
+				if grep -q $line ./etc/shells; then
+					shell=$(echo $line | sed "s|\\/|\\\/|g")
+					sed -i -e "/$shell/d" ./etc/shells
+					echo "Unregistered $line from /etc/shells."
+				fi
+			done
+		fi
+		;;
+	esac
+	;;
+*)
+	exit 1
+	;;
+esac
+
+exit 0