--- /usr/portage/games-roguelike/nethack/nethack-3.4.3-r1.ebuild	2007-04-01 13:35:45 +0900
+++ nethack-3.4.3-r1.ebuild	2008-03-19 21:24:28 +0900
@@ -4,6 +4,20 @@
 
 inherit eutils toolchain-funcs flag-o-matic games
 
+# If ${USE_GENTOO_GAMES_POLICY} is set to a non-empty value, the build will
+# follow the (current as of 2008) Gentoo games policy; otherwise, the build
+# will assume standard Unix-like games policy.  The differences are:
+#   - Under standard (non-Gentoo) policy, the "games" group is assumed to
+#     be protected from users, and NetHack will be installed as group
+#     "games" (actually ${GAMES_GROUP}).  Under Gentoo policy, users are
+#     assumed to be in the "games" group, and a separate "nethack" group
+#     will be used for installation in order to protect the data files from
+#     modification by users.
+#   - The "you have to be in the 'games' group" message will only be
+#     displayed when using Gentoo policy.
+
+USE_GENTOO_GAMES_POLICY="for now, anyway"
+
 MY_PV=${PV//.}
 DESCRIPTION="The ultimate old-school single player dungeon exploration game"
 HOMEPAGE="http://www.nethack.org/"
@@ -31,6 +45,18 @@
 	)"
 
 HACKDIR="${GAMES_DATADIR}/${PN}"
+if [ -n "${USE_GENTOO_GAMES_POLICY}" ]; then
+	NETHACK_GROUP="nethack"
+else
+	NETHACK_GROUP="games"
+fi
+
+pkg_setup() {
+	games_pkg_setup
+	if [ -n "${USE_GENTOO_GAMES_POLICY}" ]; then
+		enewgroup nethack
+	fi
+}
 
 src_unpack() {
 	unpack ${A}
@@ -105,8 +131,8 @@
 		CC="$(tc-getCC)" \
 		CFLAGS="${CFLAGS}" \
 		LFLAGS="-L/usr/X11R6/lib" \
-		GAMEPERM=0755 \
-		GAMEUID="${GAMES_USER}" GAMEGRP="${GAMES_GROUP}" \
+		GAMEPERM=2751 \
+		GAMEUID="${GAMES_USER}" GAMEGRP="${NETHACK_GROUP}" \
 		PREFIX="${D}/usr" \
 		GAMEDIR="${D}${HACKDIR}" \
 		SHELLDIR="${D}/${GAMES_BINDIR}" \
@@ -171,15 +197,51 @@
 	make_desktop_entry nethack "Nethack"
 
 	prepgamesdirs
-	chmod -R 660 "${D}/${statedir}"
-	chmod 770 "${D}/${statedir}" "${D}/${statedir}/save"
+
+	# Set permissions on the game data directory--but note that the real
+	# executable is stored here too, so fix it up afterwards.
+	chgrp -R "${NETHACK_GROUP}" "${D}/${HACKDIR}" || die "chgrp hackdir"
+	chmod -R 640 "${D}/${HACKDIR}" || die "chmod hackdir 1"
+	# ${HACKDIR} would be 750 if ${GAMES_BINDIR}/nethack wasn't a shell
+	# script that called the real executable, ${HACKDIR}/nethack
+	chmod 751 "${D}/${HACKDIR}" || die "chmod hackdir 2"
+	chmod 2751 "${D}/${HACKDIR}/nethack" || die "chmod nethack"
+
+	# "recover" should only be runnable by the administrator; otherwise,
+	# ordinary users could mess with other users' save files (see the
+	# manpage).
+	chgrp "${NETHACK_GROUP}" "${D}/${GAMES_BINDIR}/recover-nethack" \
+		|| die "chgrp recover"
+	chmod 2750 "${D}/${GAMES_BINDIR}/recover-nethack" || die "chmod recover"
+
+	# Prevent users from modifying state files. (#125902)
+	chgrp -R "${NETHACK_GROUP}" "${D}/${statedir}" || die "chgrp statedir"
+	chmod -R 660 "${D}/${statedir}" || die "chmod statedir 1"
+	chmod 770 "${D}/${statedir}" "${D}/${statedir}/save" \
+		|| die "chmod statedir 2"
 }
 
 pkg_postinst() {
-	games_pkg_postinst
+	if [ -z "${USE_GENTOO_GAMES_POLICY}" ]; then
+		gamesenv
+	else
+		games_pkg_postinst
+	fi
 	if use qt3 && has_version '=x11-libs/qt-3.1*' ; then
 		ewarn "the qt frontend may be a little unstable with this version of qt"
 		ewarn "please see Bug 32629 for more information"
 	fi
 	elog "You may want to look at /etc/skel/.nethackrc for interesting options"
+
+	# Old installations of nethack may have the wrong group or permissions,
+	# so update them once more here.  FIXME: If we force an unmerge of any
+	# old ebuild first, the code below can be removed.
+	chgrp -R "${NETHACK_GROUP}" "${HACKDIR}" || die "chgrp hackdir"
+	chmod -R 640 "${HACKDIR}" || die "chmod hackdir 1"
+	chmod 751 "${HACKDIR}" || die "chmod hackdir 2"
+	chmod 2751 "${HACKDIR}/nethack"
+	local statedir="${GAMES_STATEDIR}/${PN}"
+	chgrp -R "${NETHACK_GROUP}" "${statedir}" || die "chgrp statedir"
+	chmod -R 660 "${statedir}" || die "chmod statedir 1"
+	chmod 770 "${statedir}" "${statedir}/save" || die "chmod statedir 2"
 }