games-util/esteam: Unbundle Java runtimes found in games

This is far more involved than I would like but worth it given that
old and vulnerable JREs are being bundled and some people really don't
want to touch Oracle.

Care needs to be taken as some games don't put the JRE in its own
subdirectory. In these cases, just bin and lib are deleted. It is
currently assumed that only Java files reside in these directories but
this should obviously be checked before Java games are marked as
unbundleable.

Java being Java, it would perhaps makes sense to replace 32-bit JREs
with 64-bit ones but there is no guarantee that each game will include
the necessary native 64-bit libraries. Unfortunately we only support
multilib Java through icedtea-bin but this is better than nothing.

Package-Manager: portage-2.3.0

games-util/esteam/files/script.bash

@@ -1,10 +1,11 @@
-#!/bin/bash
+#!@GENTOO_PORTAGE_EPREFIX@/bin/bash
 # Copyright 1999-2016 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 # $Id$
 
 source "@GENTOO_PORTAGE_EPREFIX@/lib/gentoo/functions.sh"
 set -e # Gentoo bug #592470
+shopt -s nullglob
 
 while getopts vh OPT; do
 	case "${OPT}" in
@@ -119,6 +120,80 @@ for DIR in "${!DIRS[@]}"; do
 		*) unset SCAN_ARGS ;;
 	esac
 
+	# Reverse sort so that EM_X86_64 is handled before EM_386. This
+	# ensures that if both a 32-bit and 64-bit JRE are found within
+	# the same directory then 64-bit will take precedence.
+	SCAN_RESULT=$(find "${COMMON}" -type f -name libjvm.so -exec scanelf ${SCAN_ARGS} -BF $'%a\t%F' {} + | sort -r)
+
+	IFS=$'\n'
+	for SCAN_LINE in ${SCAN_RESULT}; do
+		IFS=$'\t' read EM SCANNED_PATH <<< "${SCAN_LINE}"
+
+		GAME=${SCANNED_PATH#${COMMON}}
+		GAME=${GAME%%/*}
+
+		if [[ ! -e "${SCANNED_PATH}" || ${UNBUNDLEABLES_A[${GAME}]} != 1 ]]; then
+			continue
+		fi
+
+		JAVA_ROOT=$(realpath -m "${SCANNED_PATH%/*}"/../../..)
+		JAVA=$(! ls -- "${JAVA_ROOT}"/bin/java{,32,64} 2>/dev/null)
+
+		if [[ -n "${JAVA}" ]]; then
+			GENTOO_JAVA="${COMMON}/${GAME}"/.gentoo-java
+
+			mkdir -p "${GENTOO_JAVA}"
+			echo "${EM}" > "${GENTOO_JAVA}"/em
+			echo "${JAVA//${COMMON}}" > "${GENTOO_JAVA}"/bin
+
+			chown -R --reference="${COMMON}" "${GENTOO_JAVA}"
+			chmod -R --reference="${COMMON}" "${GENTOO_JAVA}"
+			chmod a-sx "${GENTOO_JAVA}"/*
+
+			if [[ "${JAVA_ROOT}" = "${COMMON}${GAME}" ]]; then
+				rm -r "${JAVA_ROOT}"/{bin,lib}
+				einfo "Deleted: ${JAVA_ROOT}/{bin,lib} (Java)"
+			else
+				rm -r "${JAVA_ROOT}"
+				einfo "Deleted: ${JAVA_ROOT} (Java)"
+			fi
+		fi
+	done
+
+	unset IFS
+	for GENTOO_JAVA in "${COMMON}"/*/.gentoo-java; do
+		EM=$(cat "${GENTOO_JAVA}"/em)
+		BINS=$(cat "${GENTOO_JAVA}"/bin | sed "s:^:${COMMON}:")
+		IFS=$'\n'
+
+		for BIN in ${BINS}; do
+			mkdir -p "${BIN%/*}"
+		done
+
+		if [[ "${EM}" = EM_386 && "${ARCH}" != x86 ]]; then
+			ATOMS[dev-java/icedtea-bin:8[abi_x86_32,multilib]]=1
+			cat <<EOF | tee ${BINS} >/dev/null
+#!@GENTOO_PORTAGE_EPREFIX@/bin/sh
+export GENTOO_VM=icedtea-bin-8-x86
+exec @GENTOO_PORTAGE_EPREFIX@/usr/bin/java "\${@}"
+EOF
+		else
+			ATOMS[virtual/jre:1.8]=1
+			cat <<EOF | tee ${BINS} >/dev/null
+#!@GENTOO_PORTAGE_EPREFIX@/bin/sh
+@GENTOO_PORTAGE_EPREFIX@/usr/bin/depend-java-query -s "virtual/jre:1.8" >/dev/null || export GENTOO_VM=\$(@GENTOO_PORTAGE_EPREFIX@/usr/bin/depend-java-query -v "virtual/jre:1.8")
+exec @GENTOO_PORTAGE_EPREFIX@/usr/bin/java "\${@}"
+EOF
+		fi
+
+		for BIN in ${BINS}; do
+			chown -R --reference="${COMMON}" "${BIN%/*}"
+			chmod -R --reference="${COMMON}" "${BIN%/*}"
+		done
+
+		chmod a-s ${BINS}
+	done
+
 	SCAN_RESULT=$(scanelf ${SCAN_ARGS} -BRF $'%F\t%a\t%n' "${COMMON}")
 
 	unset BINARIES
@@ -208,7 +283,7 @@ unset CONTENTS
 SET="@GENTOO_PORTAGE_EPREFIX@/var/lib/portage/esteam"
 
 unset IFS
-for ATOM in $(printf "%s\n" "${!ATOMS[@]}" | sort); do
+for ATOM in "${!ATOMS[@]}"; do
 	if [[ "${ARCH}" != x86 && -n "${ATOMS32[${ATOM}]}" ]]; then
 		ATOM=${ATOM//@MULTILIB@/multilib}
 	else
@@ -230,7 +305,7 @@ done
 
 echo
 einfo "Writing Portage set to ${SET} ..."
-echo -n "${CONTENTS}" | ${SUDO} tee "${SET}" >/dev/null
+echo -n "${CONTENTS}" | sort | ${SUDO} tee "${SET}" >/dev/null
 
 einfo "Executing emerge -an${@+ }${@} @esteam ..."
 exec ${SUDO} emerge -an "${@}" @esteam