dev-lang/python-exec: Bump to the most awesome so far 2.4 release

Version bump to 2.4. The new version improves symlink handling to fix
problems when basename of custom symlinks collide with another system
executable name (previously, this resulted in the wrong script being
used), and adds support for per-script implementation preference
overrides.

1 files changed, 113 insertions, 0 deletions

diff --git a/dev-lang/python-exec/python-exec-2.4.ebuild b/dev-lang/python-exec/python-exec-2.4.ebuild
new file mode 100644
index 000000000000..121f31e7587c
--- /dev/null
+++ b/dev-lang/python-exec/python-exec-2.4.ebuild
@@ -0,0 +1,113 @@
+# 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
+		# symlink the C wrapper for python to avoid shebang recursion
+		# bug #568974
+		dosym python-exec2c /usr/bin/"${f}"
+	done
+	for f in python{,2,3}-config 2to3 idle pydoc pyvenv; do
+		# those are python scripts (except for new python-configs)
+		# so symlink them via the python wrapper
+		dosym ../lib/python-exec/python-exec2 /usr/bin/"${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
+}