shadowsocks-libev/debian/shadowsocks-libev.postinst

#!/bin/sh

set -e

# POSIX-compliant maint function recommend by devref
# to check for the existence of a command
# https://www.debian.org/doc/manuals/developers-reference/ch06.html#bpp-debian-maint-scripts
pathfind() {
	OLDIFS="$IFS"
	IFS=:
	for p in $PATH; do
		if [ -x "$p/$*" ]; then
		IFS="$OLDIFS"
		return 0
		fi
	done
	IFS="$OLDIFS"
	return 1
}

case "$1" in
	configure|reconfigure)
		if pathfind setcap; then
			if ! setcap \
				cap_net_bind_service+ep /usr/bin/ss-local \
				cap_net_bind_service,cap_net_admin+ep /usr/bin/ss-redir \
				cap_net_bind_service+ep /usr/bin/ss-server \
				cap_net_bind_service+ep /usr/bin/ss-tunnel; then
				echo "Failed to set capabilities; ss-* will only be runnable by root."
			fi
		else
			echo "setcap not installed; ss-* will only be runnable by root."
		fi
		if [ ! -f /etc/shadowsocks-libev/config.json ]; then
			set +e
			passwd=$(perl -e 'print map{("a".."z","A".."Z",0..9)[int(rand(62))]}(1..12)')
			set -e
			mkdir -p /etc/shadowsocks-libev
			sed "s/barfoo!/$passwd/" /usr/share/shadowsocks-libev/config.json \
				> /etc/shadowsocks-libev/config.json
		fi
		;;
	abort-upgrade|abort-remove|abort-deconfigure)
		exit 0
		;;
	*)
		echo "postinst called with unknown argument \`$1'" >&2
		exit 0
		;;
esac

#DEBHELPER#

exit 0