dev-lang/python-exec: Major version bump to 2.3

The new 2.3 release is the first release using new python-exec.conf
configuration file that allows users to specify complete Python
implementation preferences for python-exec.

dev-lang/python-exec/Manifest

@@ -3,3 +3,4 @@ DIST python-exec-2.0.2.tar.bz2 82217 SHA256 c411638fe94953c1e8ff57e7b66f601a8176
 DIST python-exec-2.1.tar.bz2 82167 SHA256 adac4e9ae677ca0fbb9efc55573ecbb0e8361ed7a60a5241e7abc1056fba06ad SHA512 cadfb7723aa412caec4a449909769b14a800c19650c64768b0ffb30b2c0645e70c9a039f960f3263c6c18490bb73c0129b83a72c7407f558bcaf3652cc4c8bcf WHIRLPOOL 72b73b216faf7caa8afbc3ce316771bd832e468cf84835267dc3833d5c52fce24578e09f2d3aa8a322f324426eda5e53bd9611711ea976679574b2be764c2525
 DIST python-exec-2.2.1.tar.bz2 82990 SHA256 c0fcb0c9593b26cf56cdf39ff265586a2203d608f6bfafecde0ff756de019f04 SHA512 3ca01ce229e4ecdf09a55f6bad0c90c1f0a9cff1fecb0013bb2ada1e187044631ad01af0fa70fb805465dd4e6c953cc97203d91f55ccb5208f63bf4771c0bb20 WHIRLPOOL 92e9c4629f292a0f517927e05aceda68f0c797426070ec23139dedeb1eac4d2a315892fd231ee0fe019dd3e9c6bd148fad9764ad65617012b1ef0bfbe0415506
 DIST python-exec-2.2.tar.bz2 82269 SHA256 041dccf96c31bfac5eee9c43bdf511821449313a5b7d0bd745bed09151e1bffe SHA512 9492d94e7134b555a2f3b81cbd4e159074fed21b1471090547618da34dab70264a3fa40c8b7f79c42b61938655006dd5659e26389649a2401c26b4e0c90c9ac1 WHIRLPOOL 0b13d73c2e3c9606589201af34504c317965c29bb5cfe211479d893c606ca05dff62755fcba5f76d0a653a2719f36119e6f3db050ffa9f9bb01ef2ff7b68cb4d
+DIST python-exec-2.3.tar.bz2 84201 SHA256 04f7c92727f666e4f950157a39ed6ac0a48d1a746736cc515a97195a30a3f9fe SHA512 fc6b8702a7009873b42dcde4b1771913f43ab45d92c62b9856a903b48dbe32c4ab588abe239e4512d9e2026a24aff26ec572f5cd98613e6a0160dcbd642e0849 WHIRLPOOL 3c5c238dbbf174dbbede06109bfc32e9675f53ded011dffdc0ce9327adff778bec6d89aba18ea531548d3e1ed17808f1a29cc1085f620baada74d71695f56b41

dev-lang/python-exec/python-exec-2.3.ebuild

@@ -0,0 +1,111 @@
+# Copyright 1999-2016 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Id$
+
+EAPI=5
+
+# Kids, don't do this at home!
+inherit python-utils-r1
+PYTHON_COMPAT=( "${_PYTHON_ALL_IMPLS[@]}" )
+
+# Inherited purely to have PYTHON_TARGET flags which will satisfy USE
+# dependencies and trigger necessary rebuilds.
+inherit python-r1
+
+DESCRIPTION="Python script wrapper"
+HOMEPAGE="https://bitbucket.org/mgorny/python-exec/"
+SRC_URI="https://www.bitbucket.org/mgorny/${PN}/downloads/${P}.tar.bz2"
+
+LICENSE="BSD-2"
+SLOT="2"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~m68k ~mips ~ppc ~ppc64 ~s390 ~sh ~sparc ~x86 ~ppc-aix ~amd64-fbsd ~x86-fbsd ~x64-freebsd ~x86-freebsd ~amd64-linux ~arm-linux ~x86-linux ~ppc-macos ~x64-macos ~x86-macos ~m68k-mint ~sparc-solaris ~sparc64-solaris ~x64-solaris ~x86-solaris"
+IUSE=""
+
+# eselect-python because of /usr/bin/python* collisions and new config
+# python versions because of missing $scriptdir/python* symlinks
+RDEPEND="
+	!<app-eselect/eselect-python-20160206
+	!<dev-lang/python-2.7.10-r4:2.7
+	!<dev-lang/python-3.3.5-r4:3.3
+	!<dev-lang/python-3.4.3-r4:3.4
+	!<dev-lang/python-3.5.0-r3:3.5"
+
+src_configure() {
+	local pyimpls=() i EPYTHON
+	for i in "${PYTHON_COMPAT[@]}"; do
+		python_export "${i}" EPYTHON
+		pyimpls+=( "${EPYTHON}" )
+	done
+
+	local myconf=(
+		--with-python-impls="${pyimpls[*]}"
+	)
+
+	econf "${myconf[@]}"
+}
+
+src_install() {
+	default
+
+	# Prepare and own the template
+	sed -n -e '/^#/p' config/python-exec.conf.example \
+		> "${T}"/python-exec.conf || die
+	insinto /etc/python-exec
+	doins "${T}"/python-exec.conf
+
+	local f
+	for f in python{,2,3}; do
+		# can't use symlinks here since random stuff
+		# loves to do readlink on sys.executable...
+		newbin python-exec2-c "${f}"
+	done
+	for f in python{,2,3}-config 2to3 idle pydoc pyvenv; do
+		dosym ../lib/python-exec/python-exec2 /usr/bin/"${f}"
+	done
+}
+
+pkg_preinst() {
+	if [[ -e ${EROOT}etc/python-exec/python-exec.conf ]]; then
+		# preserve current configuration
+		cp "${EROOT}"etc/python-exec/python-exec.conf \
+			"${ED}"etc/python-exec/python-exec.conf || die
+	else
+		# preserve previous Python version preference
+		local py old_pythons=()
+		local config_base=${EROOT}etc/env.d/python
+
+		# start with the 'global' preference (2 vs 3)
+		if [[ -f ${config_base}/config ]]; then
+			old_pythons+=( "$(<${config_base}/config)" )
+		fi
+
+		# then try specific py3 selection
+		for py in 3; do
+			local target=
+
+			if [[ -f ${config_base}/python${py} ]]; then
+				# try the newer config files
+				target=$(<${config_base}/python${py})
+			elif [[ -L ${EROOT}/usr/bin/python${py} ]]; then
+				# check the older symlink format
+				target=$(readlink "${EROOT}/usr/bin/python${py}")
+
+				# check if it's actually old eselect symlink
+				[[ ${target} == python?.? ]] || target=
+			fi
+
+			# add the extra target if found and != global
+			if [[ ${target} && ${old_pythons[0]} != ${target} ]]; then
+				old_pythons+=( "${target}" )
+			fi
+		done
+
+		if [[ ${old_pythons[@]} ]]; then
+			einfo "Keeping the following Python preference: ${old_pythons[*]}"
+
+			local IFS=$'\n'
+			echo "${old_pythons[*]}" \
+				>> "${ED}"etc/python-exec/python-exec.conf || die
+		fi
+	fi
+}