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# Copyright 2010-2017 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# Based in part upon 'alternatives.exlib' from Exherbo, which is:
# Copyright 2008, 2009 Bo Ørsted Andresen
# Copyright 2008, 2009 Mike Kelly
# Copyright 2009 David Leverton
# @ECLASS: alternatives-2.eclass
# @MAINTAINER:
# Gentoo Science Project <sci@gentoo.org>
# @BLURB: Manage alternative implementations.
# @DESCRIPTION:
# Autogenerate eselect modules for alternatives and ensure that valid provider
# is set.
#
# Remove eselect modules when last provider is unmerged.
#
# If your package provides pkg_postinst or pkg_prerm phases, you need to be
# sure you explicitly run alternatives-2_pkg_{postinst,prerm} where appropriate.
case "${EAPI:-0}" in
0|1|2|3|4)
die "Unsupported EAPI=${EAPI:-0} (too old) for ${ECLASS}"
;;
5|6)
;;
*)
die "Unsupported EAPI=${EAPI} (unknown) for ${ECLASS}"
;;
esac
DEPEND=">=app-admin/eselect-1.4.9-r100"
RDEPEND="${DEPEND}
!app-eselect/eselect-blas
!app-eselect/eselect-cblas
!app-eselect/eselect-lapack"
# @ECLASS-VARIABLE: ALTERNATIVES_DIR
# @INTERNAL
# @DESCRIPTION:
# Alternatives directory with symlinks managed by eselect.
ALTERNATIVES_DIR="/etc/env.d/alternatives"
# @FUNCTION: alternatives_for
# @USAGE: <alternative> <provider> <importance> <source> <target> [<source> <target> [...]]
# @DESCRIPTION:
# Set up alternative provider.
#
# EXAMPLE:
# @CODE
# alternatives_for sh bash 0 \
# /usr/bin/sh bash
# @CODE
alternatives_for() {
debug-print-function ${FUNCNAME} "${@}"
dodir /etc/env.d/alternatives
ALTERNATIVESDIR_ROOT="${D%/}" \
eselect alternatives add ${@} || die
ALTERNATIVES_CREATED+=( ${1} )
}
# @FUNCTION: cleanup_old_alternatives_module
# @USAGE: <alternative>
# @DESCRIPTION:
# Remove old alternatives module.
cleanup_old_alternatives_module() {
debug-print-function ${FUNCNAME} "${@}"
local alt=${1} old_module="${EROOT%/}/usr/share/eselect/modules/${alt}.eselect"
if [[ -f "${old_module}" && $(grep 'ALTERNATIVE=' "${old_module}" | cut -d '=' -f 2) == "${alt}" ]]; then
local version="$(grep 'VERSION=' "${old_module}" | grep -o '[0-9.]\+')"
if [[ "${version}" == "0.1" || "${version}" == "20080924" ]]; then
einfo "rm ${old_module}"
rm "${old_module}" || eerror "rm ${old_module} failed"
fi
fi
}
# @FUNCTION: alternatives-2_pkg_postinst
# @DESCRIPTION:
# Create eselect modules for all provided alternatives if necessary and ensure
# that valid provider is set.
#
# Also remove old eselect modules for provided alternatives.
#
# Provided alternatives are set up using alternatives_for().
alternatives-2_pkg_postinst() {
debug-print-function ${FUNCNAME} "${@}"
local alt
for alt in ${ALTERNATIVES_CREATED[@]}; do
if ! eselect ${alt} show > /dev/null; then
einfo "Creating Alternative for ${alt}"
eselect alternatives create ${alt}
fi
# Set alternative provider if there is no valid provider selected
eselect alternatives update "${alt}"
cleanup_old_alternatives_module ${alt}
done
}
# @FUNCTION: alternatives-2_pkg_prerm
# @DESCRIPTION:
# Ensure a valid provider is set in case the package is unmerged and
# remove autogenerated eselect modules for alternative when last
# provider is unmerged.
#
# Provided alternatives are set up using alternatives_for().
alternatives-2_pkg_prerm() {
debug-print-function ${FUNCNAME} "${@}"
local alt ret
# If we are uninstalling, update alternatives to valid provider
[[ -n ${REPLACED_BY_VERSION} ]] || ignore="--ignore"
for alt in ${ALTERNATIVES_CREATED[@]}; do
eselect alternatives update "${alt}"
ret=$?
case ${ret} in
0) : ;;
2)
# This was last provider for the alternative, remove eselect module
einfo "Cleaning up unused alternatives module for ${alt}"
eselect alternatives delete "${alt}" || eerror "Failed to remove ${alt}"
;;
*)
eerror "eselect alternatives update returned \"${ret}\""
;;
esac
done
}
EXPORT_FUNCTIONS pkg_postinst pkg_prerm
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