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#!/bin/bash
shopt -s nullglob
KERNEL="$(uname -r)"
TARGET="usr/lib/modules/$KERNEL"
PRESERVE_MODULES_DIR=/run/linux-preserve-modules
not() {
if "$@"; then
return 1
else
return 0
fi
}
preserve-modules-copy() {
TARGET_DIR="/$TARGET"
PRESERVE_DIR="$PRESERVE_MODULES_DIR/modules/$KERNEL"
# exit early if kernel version empty
if [[ -z "$KERNEL" ]]; then
echo "error: unknown kernel version" >&2
exit 1
fi
# exit early if currently running kernel modules untouched
if not grep -F -q "$TARGET"; then
echo "info: nothing to copy" >&2
exit 0
fi
# exit early if the target directory does not exist
if [[ ! -d "$TARGET_DIR" ]]; then
echo "info: nothing to copy" >&2
exit 0
fi
# clean preserved files before transaction
if [[ -f "$TARGET_DIR/.preserved" ]]; then
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"
fi
# exit early if kernel modules already copied
if [[ -d "$PRESERVE_DIR" ]]; then
echo "info: already copied" >&2
exit 0
fi
# copy over kernel modules and dep files
mkdir -p "$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() {
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
# exit early if no kernel modules copied
if [[ ! -d "$PRESERVE_DIR" ]]; 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 [[ "${#OWNERS[@]}" -ne 0 ]]; then
echo "info: modules still there" >&2
exit 0
fi
# copy over dep files and mark kernel version as preserved
touch "$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 "$KERNEL"
echo "info: linked modules" >&2
exit 0
}
usage() {
echo "usage: linux-preserve-modules <copy|link>" >&2
exit 1
}
if [[ "$#" -ne 1 ]]; then
usage
fi
case "$1" in
copy) preserve-modules-copy;;
link) preserve-modules-link;;
*) usage;;
esac
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