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#!/bin/bash
#
# Copyright © 2017 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
}
# check kernel is valid for action
# it means kernel and its headers are installed
# $1: kernel version
check_kernel() {
local kver="$1"; shift
if [[ ! -d "$install_tree/$kver/kernel" ]]; then
echo "==> No kernel $kver modules. You must install them to use DKMS!"
return 1
elif [[ ! -e "$install_tree/$kver/build/Makefile" ]]; then
echo "==> No kernel $kver headers. You must install them to use DKMS!"
return 1
fi
return 0
}
# handle actions on module addition/upgrade/removal
# $1: module name
# $2: module version
# $3: dkms action
parse_module() {
pushd "$install_tree" >/dev/null
local path
for path in */build/; do
local kver="${path%%/*}"
dkms_register "$1" "$2" "$kver" "$3"
done
popd >/dev/null
}
# handle actions on kernel addition/upgrade/removal
# $1: kernel version
# $2: dkms action
parse_kernel() {
local path
for path in "$source_tree"/*-*/dkms.conf; do
if [[ -f "$path" && "$path" =~ ^$source_tree/([^/]+)-([^/]+)/dkms\.conf$ ]]; then
dkms_register "${BASH_REMATCH[1]}" "${BASH_REMATCH[2]}" "$1" "$2"
fi
done
}
# register a dkms call
# this function suppress echo call for a module
# $1: module name, $2: module version, $3: kernel version, $4: action
dkms_register() {
DKMS_ACTION["$1/$2/$3"]="$4"
}
# check whether the dependencies of a module are installed
# $1: module name/module version
# $2: kernel version
check_dependency() {
local BUILD_DEPENDS
mod_name=${1%/*}
mod_ver=${1#*/}
readarray -t BUILD_DEPENDS <<<$(source "$source_tree/$mod_name-$mod_ver/dkms.conf"; printf '%s\n' "${BUILD_DEPENDS[@]}")
[ "$BUILD_DEPENDS" = "" ] && unset BUILD_DEPENDS
for dep in "${BUILD_DEPENDS[@]}"; do
if [ ! "$(dkms status -m "$dep" -k "$2" | grep -o installed)" = "installed" ]; then
return 1
fi
done
return 0
}
# run registered dkms commands
dkms_run() {
local nvk mod kver cont
cont=y
while [ "$cont" = "y" ]; do
cont=n
for nvk in "${!DKMS_ACTION[@]}"; do
mod=${nvk%/*}
kver=${nvk##*/}
check_kernel "$kver" || continue
if [ "${DKMS_ACTION[$nvk]}" = "install" ]; then
check_dependency "$mod" "$kver" || continue
fi
run dkms "${DKMS_ACTION[$nvk]}" "$mod" -k "$kver"
cont=y
unset DKMS_ACTION[$nvk]
done
done
# show warning for modules not installed
for nvk in "${!DKMS_ACTION[@]}"; do
[ "${DKMS_ACTION[$nvk]}" = "install" ] || continue
mod=${nvk%/*}
kver=${nvk##*/}
check_kernel "$kver" || continue
echo "==> WARNING: Cannot resolve dependencies for module $mod, kernel version $kver"
done
}
# emulated program entry point
main() {
[[ -n "$DKMS_ALPM_HOOK_DEBUG" ]] && set -x
# prevent to have all each dkms call to fail
if (( EUID )); then
echo 'You must be root to use this hook' >&2
exit 1
fi
# check args count
if (( $# < 1 )); then
echo "usage: ${0##*/} dkms-arguments" >&2
exit 1
fi
# dkms path from framework config
# note: the alpm hooks which trigger this script use static path
source_tree='/usr/src'
install_tree='/usr/lib/modules'
source /etc/dkms/framework.conf
# check source_tree and install_tree exists
local path
for path in "$source_tree" "$install_tree"; do
if [[ ! -d "$path" ]]; then
echo "==> Missing mandatory directory: $path. Exiting!"
return 1
fi
done
# Storage for DKMS action to run
declare -A DKMS_ACTION
# parse stdin paths to guess what do do
while read -r path; do
if [[ "/$path" =~ ^$source_tree/([^/]+)-([^/]+)/dkms\.conf$ ]]; then
parse_module "${BASH_REMATCH[1]}" "${BASH_REMATCH[2]}" "$@"
elif [[ "/$path" =~ ^$install_tree/([^/]+)/ ]]; then
parse_kernel "${BASH_REMATCH[1]}" "$@"
fi
done
dkms_run
return 0
}
main "$@"
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