Files
Arch-R/packages/sysutils/systemd/scripts/kernel-overlays-setup
Matthias Reichl ad9e8dc372 Add support for kernel overlays
Core Kernel modules are now installed to
/usr/lib/kernel-overlays/base/lib/modules instead of /usr/lib/modules

Firmware files are installed to
/usr/lib/kernel-overlays/base/lib/firmware instead of /usr/lib/firmware

Packages can choose to install their modules and/or firmwareinto a
different overlay directory than base so they are not automatically enabled.

A new systemd service kernel-overlays, which is run before any modules
are loaded, adds overlays enabled via /storage/.cache/kernel-overlays/*.conf

These conf files must either contain the name of a system overlay,
which will then be searched for in /usr/lib/kernel-overlays/, or an
absolute path starting with '/'.

Overlaying is implemented by symlinking files from the overlays
to /usr/lib/modules and /usr/lib/firmware as not all platforms
support overlayfs.

This overlaying system can also be used by addons to provide optional
kernel modules and/or firmware by storing the absolute path to the addon
directory in the conf file and shipping kernel modules in
<addondir>/lib/modules/<KERNELVER>.

To save space only symlinks for modules matching the currently
running kernel version are created as addons may want to ship
modules for older kernel versions as well to be backward-compatible
to older LibreELEC versions.

Changes since v1:
- fixup kernel-overlays-service: add before kmod-static-nodes.service
  Fix static device nodes for module autoloading not being created.
- fixup kernel-overlays-service: fail if /usr/lib/modules exists
- squash kernel overlays: use get_kernel_overlay_dir in linux/package.mk
- Add support for firmware files via kernel overlays
- config/functions: include kernel overlays in addon installation

Signed-off-by: Matthias Reichl <hias@horus.com>
2017-10-12 20:04:02 +02:00

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#!/bin/sh
################################################################################
# This file is part of LibreELEC - https://libreelec.tv
# Copyright (C) 2017-present Team LibreELEC
#
# LibreELEC 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.
#
# LibreELEC 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 LibreELEC. If not, see <http://www.gnu.org/licenses/>.
################################################################################
SYSTEM_OVERLAYS_DIR=/usr/lib/kernel-overlays
OVERLAY_CONFIG_DIR=/storage/.cache/kernel-overlays
KVER=$(uname -r)
MODULES_DIR="/var/lib/modules/${KVER}"
FIRMWARE_DIR="/var/lib/firmware"
mkdir -p "${MODULES_DIR}"
mkdir -p "${FIRMWARE_DIR}"
mkdir -p "${OVERLAY_CONFIG_DIR}"
log() {
echo "kernel-overlays-setup: $@" > /dev/kmsg
}
apply_overlay() {
case "$1" in
/*)
modules_overlay_dir="${1}/lib/modules/${KVER}"
firmware_overlay_dir="${1}/lib/firmware"
;;
*)
modules_overlay_dir="${SYSTEM_OVERLAYS_DIR}/${1}/lib/modules/${KVER}"
firmware_overlay_dir="${SYSTEM_OVERLAYS_DIR}/${1}/lib/firmware"
;;
esac
if [ -d "${modules_overlay_dir}" ] ; then
GOT_MODULE_OVERLAY="yes"
if cp -rfs "${modules_overlay_dir}"/* "${MODULES_DIR}" ; then
log "added modules from $modules_overlay_dir"
else
log "failed to add modules from $modules_overlay_dir"
fi
fi
if [ -d "${firmware_overlay_dir}" ] ; then
if cp -rfs "${firmware_overlay_dir}"/* "${FIRMWARE_DIR}" ; then
log "added firmware from $firmware_overlay_dir"
else
log "failed to add firmware from $firmware_overlay_dir"
fi
fi
}
# setup system base modules
log "setup base modules"
apply_overlay base
# apply user-configured module overlays
if [ -d "${OVERLAY_CONFIG_DIR}" ] ; then
log "adding overlays from ${OVERLAY_CONFIG_DIR}"
GOT_MODULE_OVERLAY="no"
for conf in "${OVERLAY_CONFIG_DIR}/"*.conf ; do
if [ -e "$conf" ] ; then
log "processing conf $conf"
overlay=$(cat "$conf")
[ -n "$overlay" ] && apply_overlay "$overlay"
fi
done
if [ "yes" = "$GOT_MODULE_OVERLAY" ] ; then
log "running depmod"
/usr/sbin/depmod -a
fi
fi
log "done"