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|
#!/bin/bash
shopt -s nullglob
not() {
if "$@"; then
return 1
else
return 0
fi
}
set-vars() {
KERNEL="$1"
TARGET="usr/lib/modules/$KERNEL"
PRESERVE_MODULES_DIR=/run/linux-preserve-modules
TARGET_DIR="/$TARGET"
PRESERVE_DIR="$PRESERVE_MODULES_DIR/modules/$KERNEL"
# exit early if kernel version empty
if [[ -z "$KERNEL" ]]; then
echo "error: unknown kernel version" >&2
exit 1
fi
}
preserve-modules-copy() {
if [[ $# -gt 1 ]]; then
echo "usage: linux-preserve-modules copy [release]" >&2
exit 1
elif [[ $# -eq 1 ]]; then
set-vars "$1"
fi
# exit early if the target directory does not exist
if [[ ! -f "$TARGET_DIR/modules.builtin" ]]; then
echo "info: nothing to copy" >&2
exit 0
fi
# exit early if kernel modules already copied
if [[ -d "$PRESERVE_DIR/modules.builtin" ]]; then
echo "info: already copied" >&2
exit 0
fi
# exit early if kernel modules already copied
if [[ -f "$TARGET_DIR/.preserved" ]]; then
echo "info: already linked" >&2
exit 0
fi
# copy over kernel modules and dep files
mkdir -p "$PRESERVE_DIR"
cp -r "$TARGET_DIR/modules".* "$PRESERVE_DIR/"
[[ -d "$TARGET_DIR/kernel" ]] && cp -r "$TARGET_DIR/kernel" "$PRESERVE_DIR/kernel"
[[ -d "$TARGET_DIR/updates" ]] && cp -r "$TARGET_DIR/updates" "$PRESERVE_DIR/updates"
echo "info: copied modules" >&2
exit 0
}
preserve-modules-link() {
if [[ $# -gt 1 ]]; then
echo "usage: linux-preserve-modules link [release]" >&2
exit 1
elif [[ $# -eq 1 ]]; then
set-vars "$1"
fi
# exit early if no kernel modules copied
if [[ ! -f "$PRESERVE_DIR/modules.builtin" ]]; then
echo "info: nothing to link" >&2
exit 0
fi
# exit early if mount targets still owned by a package
OWNERS=(
$(pacman -Qoq "$TARGET_DIR/kernel" 2>/dev/null)
$(pacman -Qoq "$TARGET_DIR/updates" 2>/dev/null)
)
if [[ "${#OWNERS[@]}" -ne 0 ]]; then
echo "info: modules still there" >&2
exit 0
fi
# exit early if kernel modules already copied
if [[ -f "$TARGET_DIR/.preserved" ]]; then
echo "info: already linked" >&2
exit 0
fi
# copy over dep files and mark kernel version as preserved
mkdir -p "$TARGET_DIR/"
touch "$TARGET_DIR/.preserved"
cp -r "$PRESERVE_DIR/modules".* "$TARGET_DIR/"
# bind mount preserved kernel modules
mkdir -p "$TARGET_DIR/kernel"
mkdir -p "$TARGET_DIR/updates"
[[ -d "$PRESERVE_DIR/kernel" ]] && mount --bind "$PRESERVE_DIR/kernel" "$TARGET_DIR/kernel"
[[ -d "$PRESERVE_DIR/updates" ]] && mount --bind "$PRESERVE_DIR/updates" "$TARGET_DIR/updates"
# trigger depmod
depmod "$KERNEL"
echo "info: linked modules" >&2
exit 0
}
preserve-modules-unlink() {
if [[ $# -gt 1 ]]; then
echo "usage: linux-preserve-modules unlink [release]" >&2
exit 1
elif [[ $# -eq 1 ]]; then
set-vars "$1"
fi
# exit early if kernel modules not already copied
if [[ ! -f "$TARGET_DIR/.preserved" ]]; then
echo "info: not linked" >&2
exit 0
fi
# clean preserved files
rm "$TARGET_DIR/.preserved"
rm "$TARGET_DIR/modules".*
mountpoint -q "$TARGET_DIR/kernel" && umount "$TARGET_DIR/kernel"
mountpoint -q "$TARGET_DIR/updates" && umount "$TARGET_DIR/updates"
# remove mount points if empty
rmdir --ignore-fail-on-non-empty "$TARGET_DIR/kernel"
rmdir --ignore-fail-on-non-empty "$TARGET_DIR/updates"
rmdir --ignore-fail-on-non-empty "$TARGET_DIR"
echo "info: unlinked modules" >&2
exit 0
}
preserve-modules-unlink-all() {
if [[ $# -gt 0 ]]; then
echo "usage: linux-preserve-modules unlink-all" >&2
exit 1
fi
# find kernels with .preserved marker file
LINKED_KERNELS=( $(find /usr/lib/modules -maxdepth 2 -type f -name .preserved | cut -d/ -f5) )
echo "info: found ${#LINKED_KERNELS[@]} kernels with linked modules" >&2
# unlink modules for each
for kernel in ${LINKED_KERNELS[@]}; do
linux-preserve-modules unlink "$kernel"
done
exit 0
}
preserve-modules-list() {
if [[ $# -gt 0 ]]; then
echo "usage: linux-preserve-modules list" >&2
exit 1
fi
# find kernels with .preserved marker file
LINKED_KERNELS=( $(find /usr/lib/modules -maxdepth 2 -type f -name .preserved | cut -d/ -f5) )
echo "info: found ${#LINKED_KERNELS[@]} kernels with linked modules" >&2
# list kernels
echo "${LINKED_KERNELS[@]}"
exit 0
}
usage() {
echo "usage: linux-preserve-modules <copy|link|unlink|unlink-all|list> [release]" >&2
exit 1
}
main() {
if [[ "$(id -u)" -ne 0 ]]; then
echo "error: this script needs to run as root" >&2
usage
fi
set-vars "$(uname -r)"
if [[ "$#" -eq 0 ]]; then
usage
fi
CMD="$1"
shift
case "$CMD" in
copy) preserve-modules-copy "$@";;
link) preserve-modules-link "$@";;
unlink) preserve-modules-unlink "$@";;
unlink-all) preserve-modules-unlink-all "$@";;
list) preserve-modules-list "$@";;
*) usage;;
esac
}
main "$@"
|