dev-lang/python-exec: Remove python2 symlink

Stop installing python2* symlinks.  We have only one Python 2
interpreter left, so let's move it there.  As a bonus, people without
Python 2.7 installed will not have it at all.

Closes: https://bugs.gentoo.org/745975
Signed-off-by: Michał Górny <mgorny@gentoo.org>

1 files changed, 126 insertions, 0 deletions

diff --git a/dev-lang/python-exec/python-exec-2.4.6-r2.ebuild b/dev-lang/python-exec/python-exec-2.4.6-r2.ebuild
new file mode 100644
index 000000000000..a5edfb3d622c
--- /dev/null
+++ b/dev-lang/python-exec/python-exec-2.4.6-r2.ebuild
@@ -0,0 +1,126 @@
+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit python-utils-r1
+
+DESCRIPTION="Python script wrapper"
+HOMEPAGE="https://github.com/mgorny/python-exec/"
+SRC_URI="https://github.com/mgorny/python-exec/releases/download/v${PV}/${P}.tar.bz2"
+
+LICENSE="BSD-2"
+SLOT="2"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~ppc-aix ~x64-cygwin ~amd64-linux ~x86-linux ~ppc-macos ~x64-macos ~x86-macos ~m68k-mint ~sparc-solaris ~sparc64-solaris ~x64-solaris ~x86-solaris"
+# Internal Python project hack.  Do not copy it.  Ever.
+IUSE="${_PYTHON_ALL_IMPLS[@]/#/python_targets_}"
+
+RDEPEND="!<=dev-lang/python-2.7.18-r3:2.7"
+
+src_configure() {
+	local pyimpls=() i EPYTHON
+	for i in "${_PYTHON_ALL_IMPLS[@]}"; do
+		if use "python_targets_${i}"; then
+			python_export "${i}" EPYTHON
+			pyimpls+=( "${EPYTHON}" )
+		fi
+	done
+
+	local myconf=(
+		--with-fallback-path="${EPREFIX}/usr/local/sbin:${EPREFIX}/usr/local/bin:${EPREFIX}/usr/sbin:${EPREFIX}/usr/bin:${EPREFIX}/sbin:${EPREFIX}/bin"
+		--with-python-impls="${pyimpls[*]}"
+	)
+
+	econf "${myconf[@]}"
+}
+
+src_install() {
+	default
+
+	# Prepare and own the template
+	insinto /etc/python-exec
+	newins - python-exec.conf \
+		< <(sed -n -e '/^#/p' config/python-exec.conf.example)
+
+	local programs=( python python3 )
+	local scripts=( python-config python3-config 2to3 idle pydoc pyvenv )
+
+	local f
+	for f in "${programs[@]}"; do
+		# symlink the C wrapper for python to avoid shebang recursion
+		# bug #568974
+		dosym python-exec2c /usr/bin/"${f}"
+	done
+	for f in "${scripts[@]}"; 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 [[ ${old_pythons[@]} ]]; then
+			elog "You seem to have just upgraded into the new version of python-exec"
+			elog "that uses python-exec.conf for configuration. The ebuild has attempted"
+			elog "to convert your previous configuration to the new format, resulting"
+			elog "in the following preferences (most preferred version first):"
+			elog
+			for py in "${old_pythons[@]}"; do
+				elog "  ${py}"
+			done
+			elog
+			elog "Those interpreters will be preferred when running Python scripts or"
+			elog "calling wrapped Python executables (python, python2, pydoc...)."
+			elog "If none of the preferred interpreters are supported, python-exec will"
+			elog "fall back to the newest supported Python version."
+			elog
+			elog "Please note that due to the ambiguous character of the old settings,"
+			elog "you may want to modify the preference list yourself. In order to do so,"
+			elog "open the following file in your favorite editor:"
+			elog
+			elog "  ${EROOT}/etc/python-exec/python-exec.conf"
+			elog
+			elog "For more information on the new configuration format, please read"
+			elog "the comment on top of the installed configuration file."
+
+			local IFS=$'\n'
+			echo "${old_pythons[*]}" \
+				>> "${ED}"/etc/python-exec/python-exec.conf || die
+		fi
+	fi
+}