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#!/bin/bash
# called by dracut
#
# Parses depmod configuration and calls instmods for out-of-tree kernel
# modules found. Specifically, kernel modules inside directories that
# come from the following places are included (if these kernel modules
# are present in modules.dep):
# - "search" configuration option;
# - "override" configuration option (matching an exact file name constructed
# by concatenating the provided directory and the kernel module name);
# - "external" configuration option (if "external" is a part of "search"
# configuration).
# (See depmod.d(5) for details.)
#
# This module has the following variables available for configuration:
# - "depmod_modules_dep" - Path to the modules.dep file
# ("$srcmods/modules.dep" by default);
# - "depmod_module_dir" - Directory containing kernel modules ("$srcmods"
# by default);
# - "depmod_configs" - array of depmod configuration paths to parse
# (as supplied to depmod -C, ("/run/depmod.d/"
# "/etc/depmod.d/" "/lib/depmod.d/") by default).
installkernel()
{
: "${depmod_modules_dep:=$srcmods/modules.dep}"
: "${depmod_module_dir:=$srcmods}"
[[ -f "${depmod_modules_dep}" ]] || return 0
# Message printers with custom prefix
local mod_name="kernel-modules-extra"
prinfo() { dinfo " ${mod_name}: $*"; }
prdebug() { ddebug " ${mod_name}: $*"; }
# Escape a string for usage as a part of extended regular expression.
# $1 - string to escape
re_escape() {
printf "%s" "$1" | sed 's/\([.+?^$\/\\|()\[]\|\]\)/\\\0/'
}
local OLDIFS
local cfg
local cfgs=()
local search_list=""
local overrides=()
local external_dirs=()
local e f
## Gathering and sorting configuration file list
[ -n "${depmod_configs[@]-}" ] \
|| depmod_configs=(/run/depmod.d/ /etc/depmod.d/ /lib/depmod.d/)
for cfg in "${depmod_configs[@]}"; do
[ -e "$cfg" ] || {
prdebug "configuration source \"$cfg\" does not exist"
continue
}
# '/' is used as a separator between configuration name and
# configuration path
if [ -d "$cfg" ]; then
for f in "$cfg/"*; do
[[ -e "$f" && ! -d "$f" ]] || {
prdebug "configuration source" \
"\"$cfg\" is ignored" \
"(directory or doesn't exist)"
continue
}
cfgs+=("$(basename "$f")/$f")
done
else
cfgs+=("$(basename "$cfg")/$cfg")
fi
done
OLDIFS="$IFS"
IFS=$'\n'
LANG=C cfgs=($(printf '%s\n' "${cfgs[@]}" \
| sort -u -k1,1 -t '/' | cut -f 2- -d '/'))
IFS="$OLDIFS"
## Parse configurations
for cfg in "${cfgs[@]}"; do
prdebug "parsing configuration file \"$cfg\""
local k v mod kverpat path
while read -r k v; do
case "$k" in
search)
search_list="$search_list $v"
prdebug "$cfg: added \"$v\" to the list of" \
"search directories"
;;
override) # module_name kver_pattern dir
read -r mod kverpat path <<<"$v"
if [[ ! "$mod" || ! "$kverpat" || ! "$path" ]]
then
prinfo "$cfg: ignoring incorrect" \
"override option: \"$k $v\""
continue
fi
if [[ '*' = "$kverpat" \
|| "$kernel" =~ "$kverpat" ]]
then
overrides+=("${path}/${mod}")
prdebug "$cfg: added override" \
"\"${path}/${mod}\""
else
prdebug "$cfg: override \"$v\" is" \
"ignored since \"$kverpat\"" \
"doesn't match \"$kernel\""
fi
;;
external) # kverpat dir
read -r kverpat path <<<"$v"
if [[ ! "$kverpat" || ! "$path" ]]; then
prinfo "$cfg: ignoring incorrect" \
"external option: \"$k $v\""
continue
fi
if [[ '*' = "$kverpat" \
|| "$kernel" =~ "$kverpat" ]]
then
external_dirs+=("$path")
prdebug "$cfg: added external" \
"directory \"$path\""
else
prdebug "$cfg: external directory" \
"\"$path\" is ignored since" \
"\"$kverpat\" doesn't match " \
"\"$kernel\""
fi
;;
'#'*|'') # comments and empty strings
;;
include|make_map_files) # ignored by depmod
;;
*)
prinfo "$cfg: unknown depmod configuration" \
"option \"$k $v\""
;;
esac
done < "$cfg"
done
# "updates built-in" is the default search list
: "${search_list:=updates}"
## Build a list of regular expressions for grepping modules.dep
local pathlist=()
for f in "${overrides[@]}"; do
pathlist+=("^$(re_escape "$f")")
done
for f in $(printf "%s" "$search_list"); do
# Ignoring builtin modules
[ "built-in" != "$f" ] || continue
if [ "external" = "$f" ]; then
for e in "${external_dirs[@]}"; do
pathlist+=("$(re_escape "${e%/}")/[^:]+")
done
fi
pathlist+=("$(re_escape "${f%/}")/[^:]+")
done
## Filter modules.dep, canonicalise the resulting filenames and supply
## them to instmods.
[ 0 -lt "${#pathlist[@]}" ] || return 0
printf "^%s\.ko(\.gz|\.bz2|\.xz)?:\n" "${pathlist[@]}" \
| (LANG=C grep -E -o -f - -- "$depmod_modules_dep" || exit 0) \
| tr -d ':' \
| (cd "$depmod_module_dir" || exit; xargs -r realpath -se --) \
| instmods || return 1
return 0
}