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# Copyright 2008, 2009 Bo Ørsted Andresen
# Copyright 2008, 2009 Mike Kelly
# Copyright 2009 David Leverton
# 2010: Adapted for Gentoo by Sebastien Fabbro, who does not like copyrights
# Distributed under the terms of the GNU General Public License v2
# If your package provides pkg_postinst or pkg_prerm phases, you need to be
# sure you explicitly run alternatives_pkg_{postinst,prerm} where appropriate.
ALTERNATIVES_DIR="/etc/env.d/alternatives"
DEPEND=">=app-admin/eselect-1.2.15-r1"
RDEPEND="${DEPEND}
!app-admin/eselect-blas
!app-admin/eselect-cblas
!app-admin/eselect-lapack"
# alternatives_for alternative provider importance source target [ source target [...]]
alternatives_for() {
#echo alternatives_for "${@}"
(( $# >= 5 )) && (( ($#-3)%2 == 0)) || die "${FUNCNAME} requires exactly 3+N*2 arguments where N>=1"
local x dupl alternative=${1} provider=${2} importance=${3} index unique src target ret=0
shift 3
# make sure importance is a signed integer
if [[ -n ${importance} ]] && ! [[ ${importance} =~ ^[0-9]+(\.[0-9]+)*$ ]]; then
eerror "Invalid importance (${importance}) detected"
((ret++))
fi
[[ -d "${ED}${ALTERNATIVES_DIR}/${alternative}/${provider}" ]] || dodir "${ALTERNATIVES_DIR}/${alternative}/${provider}"
# keep track of provided alternatives for use in pkg_{postinst,prerm}. keep a mapping between importance and
# provided alternatives and make sure the former is set to only one value
if ! has "${alternative}:${provider}" "${ALTERNATIVES_PROVIDED[@]}"; then
index=${#ALTERNATIVES_PROVIDED[@]}
ALTERNATIVES_PROVIDED+=( "${alternative}:${provider}" )
ALTERNATIVES_IMPORTANCE[index]=${importance}
[[ -n ${importance} ]] && echo "${importance}" > "${ED}${ALTERNATIVES_DIR}/${alternative}/${provider}/_importance"
else
for((index=0;index<${#ALTERNATIVES_PROVIDED[@]};index++)); do
if [[ ${alternative}:${provider} == ${ALTERNATIVES_PROVIDED[index]} ]]; then
if [[ -n ${ALTERNATIVES_IMPORTANCE[index]} ]]; then
if [[ -n ${importance} && ${ALTERNATIVES_IMPORTANCE[index]} != ${importance} ]]; then
eerror "Differing importance (${ALTERNATIVES_IMPORTANCE[index]} != ${importance}) detected"
((ret++))
fi
else
ALTERNATIVES_IMPORTANCE[index]=${importance}
[[ -n ${importance} ]] && echo "${importance}" > "${ED}${ALTERNATIVES_DIR}/${alternative}/${provider}/_importance"
fi
fi
done
fi
while (( $# >= 2 )); do
src=${1//+(\/)/\/}; target=${2//+(\/)/\/}
if [[ ${src} != /* ]]; then
eerror "Source path must be absolute, but got ${src}"
((ret++))
else
local reltarget= dir=${ALTERNATIVES_DIR}/${alternative}/${provider}${src%/*}
while [[ -n ${dir} ]]; do
reltarget+=../
dir=${dir%/*}
done
reltarget=${reltarget%/}
[[ ${target} == /* ]] || reltarget+=${src%/*}/
reltarget+=${target}
dodir "${ALTERNATIVES_DIR}/${alternative}/${provider}${src%/*}"
dosym "${reltarget}" "${ALTERNATIVES_DIR}/${alternative}/${provider}${src}"
# say ${ED}/sbin/init exists and links to /bin/systemd (which doesn't exist yet)
# the -e test will fail, so check for -L also
if [[ -e ${ED}${src} || -L ${ED}${src} ]]; then
local fulltarget=${target}
[[ ${fulltarget} != /* ]] && fulltarget=${src%/*}/${fulltarget}
if [[ -e ${ED}${fulltarget} || -L ${ED}${fulltarget} ]]; then
die "${src} defined as provider for ${fulltarget}, but both already exist in \${ED}"
else
mv "${ED}${src}" "${ED}${fulltarget}" || die
fi
fi
fi
shift 2
done
[[ ${ret} -eq 0 ]] || die "Errors detected for ${provider}, provided for ${alternative}"
}
cleanup_old_alternatives_module() {
local alt=${1} old_module="${EROOT}/usr/share/eselect/modules/${alt}.eselect"
if [[ -f "${old_module}" && "$(source "${old_module}" &>/dev/null; echo "${ALTERNATIVE}")" == "${alt}" ]]; then
local version="$(source "${old_module}" &>/dev/null; echo "${VERSION}")"
if [[ "${version}" == "0.1" || "${version}" == "20080924" ]]; then
echo rm "${old_module}"
rm "${old_module}" || eerror "rm ${old_module} failed"
fi
fi
}
alternatives-2_pkg_postinst() {
local a alt provider module_version="20090908"
for a in "${ALTERNATIVES_PROVIDED[@]}"; do
alt="${a%:*}"
provider="${a#*:}"
if [[ ! -f "${EROOT}/usr/share/eselect/modules/auto/${alt}.eselect" \
|| "$(source "${EROOT}/usr/share/eselect/modules/auto/${alt}.eselect" &>/dev/null; echo "${VERSION}")" \
-ne "${module_version}" ]]; then
#einfo "Creating alternatives module for ${alt}"
if [[ ! -d ${EROOT}/usr/share/eselect/modules/auto ]]; then
install -d "${EROOT}"/usr/share/eselect/modules/auto || eerror "Could not create eselect modules dir"
fi
cat > "${EROOT}/usr/share/eselect/modules/auto/${alt}.eselect" <<-EOF
# This module was automatically generated by alternatives.eclass
DESCRIPTION="Alternatives for ${alt}"
VERSION="${module_version}"
MAINTAINER="eselect@gentoo.org"
ESELECT_MODULE_GROUP="Alternatives"
ALTERNATIVE="${alt}"
inherit alternatives
EOF
fi
#echo eselect "${alt}" update "${provider}"
einfo "Creating ${provider} alternative module for ${alt}"
eselect "${alt}" update "${provider}"
cleanup_old_alternatives_module ${alt}
done
}
alternatives-2_pkg_prerm() {
local a alt provider p ignore
[[ -n ${REPLACED_BY_ID} ]] || ignore=" --ignore"
for a in "${ALTERNATIVES_PROVIDED[@]}"; do
alt="${a%:*}"
provider="${a#*:}"
#echo "Making sure ${alt} has a valid provider"
#echo eselect "${alt}" update${ignore} "${provider}"
eselect "${alt}" update${ignore} "${provider}" && continue
einfo "Removed ${provider} alternative module for ${alt}, current is $(eselect ${alt} show)"
if [[ $? -eq 2 ]]; then
einfo "Cleaning up unused alternatives module for ${alt}"
echo rm "${EROOT}/usr/share/eselect/modules/auto/${alt}.eselect"
rm "${EROOT}/usr/share/eselect/modules/auto/${alt}.eselect" ||
eerror rm "${EROOT}/usr/share/eselect/modules/auto/${alt}.eselect" failed
fi
done
}
EXPORT_FUNCTIONS pkg_postinst pkg_prerm
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