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#!/usr/bin/env bash
# Author: James Cherti
# URL: https://github.com/jamescherti/archlinux-linux-keep-modules
# License: Distributed under terms of the MIT license.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to
# deal in the Software without restriction, including without limitation the
# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
# sell copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
set -euf -o pipefail
log() {
echo "[pacman-hook-linux-modules]" "$@"
}
#
# Backup the modules of the currently running Linux kernel.
#
backup_linux_modules() {
if ! [[ -d "$BACKUP_MODULES_SRC" ]]; then
log "[INFO] There is nothing to backup."
return 0
fi
log "[UPDATE BACKUP] $BACKUP_MODULES_SRC/ -> $BACKUP_MODULES_DEST/"
mkdir -p "$BACKUP_MODULES_DEST" || return 1
rsync "${RSYNC_OPTS[@]}" \
"$BACKUP_MODULES_SRC/" "$BACKUP_MODULES_DEST/" || return 1
}
#
# Restore the modules of the currently running Linux kernel.
#
restore_linux_modules() {
if ! [[ -d "$BACKUP_MODULES_DEST" ]]; then
log "[INFO] There is nothing to restore."
return 0
fi
if [[ -d "$BACKUP_MODULES_SRC" ]]; then
# Backup the kernel modules again because the package upgrade may have
# modified them.
backup_linux_modules || return 1
fi
log "[RESTORE] ${BACKUP_MODULES_DEST}/ -> ${BACKUP_MODULES_SRC}/"
rsync "${RSYNC_OPTS[@]}" \
"$BACKUP_MODULES_DEST/" "${BACKUP_MODULES_SRC}/" || return 1
}
#
# Delete the kernel modules that are neither owned by an Arch Linux package
# nor used by the currently running Linux kernel.
#
cleanup_linux_modules() {
local errno=0
local cleanup_done=0
local list_modules
readarray -t list_modules < <(ls --almost-all -1 "${MODULES_BASE_DIR}")
if [[ ${#list_modules[@]} -eq 0 ]]; then
echo "Nothing to do."
return 0
fi
local cur_kernel_ver
for cur_kernel_ver in "${list_modules[@]}"; do
local cur_backup_modules_src="${MODULES_BASE_DIR}/${cur_kernel_ver}"
if [[ -d "$cur_backup_modules_src" ]] && \
[[ "$KERNEL_VER" != "$cur_kernel_ver" ]] && \
! pacman -Qo "$cur_backup_modules_src" >/dev/null 2>&1; then
local sub_fileordir
local sub_fileordir_found=0
if [[ "$cur_kernel_ver" = "$BACKUP_SUBDIR_NAME" ]]; then
sub_fileordir_found=1
fi
for sub_fileordir in build extramodules kernel pkgbase vmlinuz; do
if [[ -e "$cur_backup_modules_src/$sub_fileordir" ]]; then
sub_fileordir_found=1
break
fi
done
if [[ $sub_fileordir_found -eq 0 ]]; then
log "[IGNORE] $cur_backup_modules_src"
else
log "[DELETE] $cur_backup_modules_src"
rm -fr "$cur_backup_modules_src" || errno=1
cleanup_done=1
fi
fi
done
if [[ $cleanup_done -eq 0 ]]; then
echo "Nothing to do."
fi
return "$errno"
}
print_usage() {
echo "Usage: $0 <backup|restore|cleanup>"
}
main() {
RSYNC_OPTS=(-a --xattrs --hard-links --acls --sparse)
KERNEL_VER="$(uname -r)"
MODULES_BASE_DIR="/usr/lib/modules"
BACKUP_SUBDIR_NAME="pacman-hook-backup"
BACKUP_MODULES_SRC="${MODULES_BASE_DIR}/${KERNEL_VER}"
BACKUP_MODULES_DEST="${MODULES_BASE_DIR}/${BACKUP_SUBDIR_NAME}/${KERNEL_VER}"
if [[ "$KERNEL_VER" = "" ]]; then
echo "Error: invalid value returned by the command 'uname -r'." >&2
exit 1
fi
if [[ "$#" -eq 0 ]]; then
print_usage
exit 1
fi
if [[ "$1" = "backup" ]]; then
# Backup the kernel modules before upgrading the packages.
backup_linux_modules || exit 1
elif [[ "$1" = "restore" ]]; then
# Restore the kernel modules after upgrading the packages.
restore_linux_modules || exit 1
elif [[ "$1" = "cleanup" ]]; then
cleanup_linux_modules || exit 1
else
print_usage
exit 1
fi
exit 0
}
main "$@"
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