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#!/bin/bash
#
# Copyright © 2018-2021, Sébastien Luttringer
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
# display what to run and run it quietly
run() {
echo "==> $*"
"$@" > /dev/null
local ret=$?
(( $ret )) && echo "==> WARNING: \`$*' exited $ret"
return $ret
}
# check whether the dependencies of a module are installed
# $1: module name
# $2: module version
# $3: kernel version
check_dependency() { (
source "$source_tree/$1-$2/dkms.conf"
local mod lines line
for mod in "${BUILD_DEPENDS[@]}"; do
mapfile lines < <(dkms status -m "$mod" -k "$3")
for line in "${lines[@]}"; do
[[ "$line" =~ "$mod/"[^,]+", $3, "[^:]+': installed' ]] && break 2
done
exit 1
done
exit 0
) }
# check whether the modules should be built with this kernel version
# $1: module name
# $2: module version
# $3: kernel version
check_buildexclusive() {
local BUILD_EXCLUSIVE_KERNEL=$(source "$source_tree/$1-$2/dkms.conf"; printf '%s\n' "$BUILD_EXCLUSIVE_KERNEL")
[[ "$3" =~ $BUILD_EXCLUSIVE_KERNEL ]]
}
# list all kernel versions
all_kver() {
pushd "$install_tree" >/dev/null
local path
for path in */build/; do
echo "${path%%/*}"
done
popd >/dev/null
}
# list all module name/version for a specific kernel version
# $1: kernel version
all_nv_from_kver() {
local path
for path in "$source_tree"/*-*/dkms.conf; do
if [[ -f "$path" && "$path" =~ ^$source_tree/([^/]+)-([^/]+)/dkms\.conf$ ]]; then
echo "${BASH_REMATCH[1]}/${BASH_REMATCH[2]}"
fi
done
}
# list of modules/version for installed/built kernel version
# $1: kernel version
built_nv_from_kver() {
local line
dkms status -k "$1" | while read -r line; do
if [[ "$line" =~ ^([^/]+/[^,]+)", $1, "[^:]+": "(built|installed) ]]; then
echo "${BASH_REMATCH[1]}"
fi
done
}
# list installed or built kernel version for a specific module version
# $1 : module name/module version
built_kver_from_nv() {
local line
dkms status "$1" | while read -r line; do
if [[ "$line" =~ ^"$1, "([^,]+)", "[^:]+": "(built|installed) ]]; then
echo "${BASH_REMATCH[1]}"
fi
done
}
# install registered modules
dkms_install() {
# list of modules to build for a specific kernel
local -A tobuild=()
# add new/updated modules for all kernels to the build list
local nv kver
for nv in "${!DKMS_MODULES[@]}"; do
for kver in $(all_kver); do
tobuild["$nv/$kver"]=''
done
done
# add modules for new/updated kernels to the build list
for kver in "${!KERNEL_VERSIONS[@]}"; do
for nv in $(all_nv_from_kver "$kver"); do
tobuild["$nv/$kver"]=''
done
done
# list of kver which requires depmod refresh
local -A depmods=()
# let's build and install
local nvk mod mver
local -i retry=1
while (( $retry > 0 )); do
retry=0
for nvk in "${!tobuild[@]}"; do
[[ "$nvk" =~ ([^/]+)/([^/]+)/(.+) ]] || continue
mod="${BASH_REMATCH[1]}"
mver="${BASH_REMATCH[2]}"
kver="${BASH_REMATCH[3]}"
# do not build excluded modules
if ! check_buildexclusive "$mod" "$mver" "$kver"; then
unset tobuild[$nvk]
continue
# skip modules with missing kernel headers
elif [[ ! -d "$install_tree/$kver/build/include" ]]; then
ERROR_MESSAGES+=("Missing $kver kernel headers for module $mod/$mver.")
unset tobuild[$nvk]
continue
# skip modules with missing kernel package
elif [[ ! -d "$install_tree/$kver/kernel" ]]; then
ERROR_MESSAGES+=("Missing $kver kernel modules tree for module $mod/$mver.")
unset tobuild[$nvk]
continue
# postpone modules with missing dependencies
elif ! check_dependency "$mod" "$mver" "$kver"; then
continue
fi
# give it a try dkms
run dkms install --no-depmod "$mod/$mver" -k "$kver"
if (( $? == 0 )); then
# register kernel version for later depmod
depmods[$kver]=''
fi
unset tobuild[$nvk]
# maybe this module was a dep of another, so we retry
retry=1
done
done
# run depmod later for performance improvments
if (( $DKMS_DEPMOD )); then
for kver in "${!depmods[@]}"; do
run depmod "$kver"
done
fi
# add errors messages for missing dependencies modules
for nvk in "${!tobuild[@]}"; do
[[ "$nvk" =~ ([^/]+/[^/]+)/(.+) ]] || continue
nv="${BASH_REMATCH[1]}"
kver="${BASH_REMATCH[2]}"
ERROR_MESSAGES+=("Missing dependencies to install module $nv for kernel $kver.")
done
}
# remove registered modules
# run depmod once per kernel for performance improvments
dkms_remove() {
local nv kver
local -A depmods=()
# remove full modules first
for nv in "${!DKMS_MODULES[@]}"; do
# try to remove modules one by one to keep the depmod optimization
for kver in $(built_kver_from_nv "$nv"); do
run dkms remove --no-depmod "$nv" -k "$kver"
if (( $? == 0 )); then
# register kernel version for later depmod
depmods[$kver]=''
else
ERROR_MESSAGES+=("Failed to remove module $nv for kernel $kver.")
fi
done
# ensure module removal (even if only added)
if [[ $(dkms status "$nv") ]]; then
run dkms remove "$nv"
(( $? == 0 )) || ERROR_MESSAGES+=("Failed to remove module $nv.")
fi
done
# remove modules for a specific kernel version
for kver in "${!KERNEL_VERSIONS[@]}"; do
for nv in $(built_nv_from_kver "$kver"); do
run dkms remove --no-depmod "$nv" -k "$kver"
if (( $? == 0 )); then
# register kernel version for later depmod
depmods[$kver]=''
else
ERROR_MESSAGES+=("Failed to remove module $nv for kernel $kver.")
fi
done
done
# run depmod later for performance improvments
if (( $DKMS_DEPMOD )); then
for kver in "${!depmods[@]}"; do
run depmod "$kver"
done
fi
}
# display hook usage and exit $1 (default 1)
usage() {
cat << EOF >&2
usage: ${0##*/} <options> install|remove
options: -D Do not run depmod
EOF
exit ${1:-1}
}
# emulated program entry point
main() {
[[ "$DKMS_ALPM_HOOK_DEBUG" ]] && set -x
# prevent each dkms call from failing with authorization errors
if (( EUID )); then
echo 'You must be root to use this hook' >&2
return 1
fi
# parse command line options
declare -i DKMS_DEPMOD=1
local opt
while getopts 'hD' opt; do
case $opt in
D) DKMS_DEPMOD=0;;
*) usage;;
esac
done
shift $((OPTIND - 1))
(( $# != 1 )) && usage
# parse command action to early exit
case "$1" in
install|remove) declare -r DKMS_ACTION="$1";;
*) usage;;
esac
# dkms path from framework config
# note: the alpm hooks which trigger this script use static path
source_tree='/usr/src'
install_tree='/usr/lib/modules'
source /etc/dkms/framework.conf
# check source_tree and install_tree exists
local path
for path in "$source_tree" "$install_tree"; do
if [[ ! -d "$path" ]]; then
echo "==> Missing mandatory directory: $path. Exiting!" >&2
return 1
fi
done
# global storage for changed DKMS modules
# we use associate arrays to prevent duplication
# the key is <module name>/<module version>/<kernel version>
declare -A DKMS_MODULES
# global storage for changed linux kernels
# we use associate arrays to prevent duplication
declare -A KERNEL_VERSIONS
# global storage for error messages
declare -a ERROR_MESSAGES
# parse stdin paths to guess what we should install/remove
while read -r path; do
if [[ "/$path" =~ ^$source_tree/([^/]+)-([^/]+)/dkms\.conf$ ]]; then
# we match file updates on dkms modules sources
DKMS_MODULES["${BASH_REMATCH[1]}/${BASH_REMATCH[2]}"]=''
elif [[ "/$path" =~ ^$install_tree/([^/]+)/ ]]; then
# we match file updates on kernels install/removal
KERNEL_VERSIONS["${BASH_REMATCH[1]}"]=''
fi
done
dkms_$DKMS_ACTION
# display errors at the end, to maximize readers
local msg
for msg in "${ERROR_MESSAGES[@]}"; do
echo "==> ERROR: $msg" >&2
done
return 0
}
main "$@"
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