Current File : //usr/lib/dracut/modules.d/99microcode_ctl-fw_dir_override/module-setup.sh
#!/bin/bash
# Hack in additional firmware directories for supported caveats.
#
# SPDX-License-Identifier: CC0-1.0
check() {
return 0
}
install() {
local FW_DIR=/lib/firmware
local DATA_DIR=/usr/share/microcode_ctl/ucode_with_caveats
local CFG_DIR="/etc/microcode_ctl/ucode_with_caveats"
local check_caveats=/usr/libexec/microcode_ctl/check_caveats
local fw_path_para=$(< /sys/module/firmware_class/parameters/path)
local verbose_opt
local cc_out
local path
local ignored
local do_skip_host_only
local p
verbose_opt=
[ 4 -gt "$stdloglvl" ] || verbose_opt="-v"
# HACK: we override external fw_dir variable in order to get
# an additional ucode based on the kernel version.
dinfo " microcode_ctl module: mangling fw_dir"
[ -z "$fw_dir_l" ] || {
dinfo " microcode_ctl: avoid touching fw_dir as" \
"it has been changed (fw_dir_l is '$fw_dir_l')"
return 0
}
# Reset fw_dir to avoid inclusion of kernel-version-specific directories
# populated with microcode for the late load, only in case it is set
# to the default value to avoid meddling with user-enforced changes.
# The second variant has been introduced in dracut-057~5.
[ \( "x$fw_dir" != \
"x/lib/firmware/updates /lib/firmware /lib/firmware/$kernel" \) -a \
\( "x$fw_dir" != \
"x${fw_path_para:+$fw_path_para }/lib/firmware/updates/$kernel /lib/firmware/updates /lib/firmware/$kernel /lib/firmware" \) ] || {
fw_dir="/lib/firmware/updates /lib/firmware"
dinfo " microcode_ctl: reset fw_dir to \"${fw_dir}\""
}
fw_dir_add=""
while read -d $'\n' -r i; do
dinfo " microcode_ctl: processing data directory " \
"\"$DATA_DIR/$i\"..."
if [ "x" != "x$hostonly" ]; then
do_skip_host_only=0
local sho_overrides="
$CFG_DIR/skip-host-only-check
$CFG_DIR/skip-host-only-check-$i
$FW_DIR/$kernel/skip-host-only-check
$FW_DIR/$kernel/skip-host-only-check-$i"
for p in $(echo "$sho_overrides"); do
[ -e "$p" ] || continue
do_skip_host_only=1
dinfo " microcode_ctl: $i; skipping" \
"Host-Only check, since \"$p\" exists."
break
done
else
do_skip_host_only=1
fi
match_model_opt=""
[ 1 = "$do_skip_host_only" ] || match_model_opt="-m"
if ! cc_out=$($check_caveats -e -k "$kernel" -c "$i" \
$verbose_opt $match_model_opt)
then
dinfo " microcode_ctl: kernel version \"$kernel\"" \
"failed early load check for \"$i\", skipping"
continue
fi
path=$(printf "%s" "$cc_out" | sed -n 's/^paths //p')
[ -n "$path" ] || {
ignored=$(printf "%s" "$cc_out" | \
sed -n 's/^skip_cfgs //p')
if [ -n "$ignored" ]; then
dinfo " microcode_ctl: configuration" \
"\"$i\" is ignored"
else
dinfo " microcode_ctl: no microcode paths" \
"are associated with \"$i\", skipping"
fi
continue
}
dinfo " microcode_ctl: $i: caveats check for kernel" \
"version \"$kernel\" passed, adding" \
"\"$DATA_DIR/$i\" to fw_dir variable"
if [ 0 -eq "$do_skip_host_only" ]; then
fw_dir_add="$DATA_DIR/$i "
else
fw_dir_add="$DATA_DIR/$i $fw_dir_add"
fi
# The list of directories is reverse-sorted in order to preserve the
# "last wins" policy in case of presence of multiple microcode
# revisions.
#
# In case of hostonly == 0, all microcode revisions will be included,
# but since the microcode search is done with the "first wins" policy
# by the (early) microcode loading code, the correct microcode revision
# still has to be picked.
#
# Note that dracut without patch [1] puts only the last directory
# in the early cpio; we try to address this by putting only the last
# matching caveat in the search path, but that workaround works only
# for host-only mode; non-host-only mode early cpio generation is still
# broken without that patch.
#
# [1] https://github.com/dracutdevs/dracut/commit/c44d2252bb4b
done <<-EOF
$(find "$DATA_DIR" -maxdepth 1 -mindepth 1 -type d -printf "%f\n" \
| LC_ALL=C sort)
EOF
fw_dir="${fw_dir_add}${fw_dir}"
dinfo " microcode_ctl: final fw_dir: \"${fw_dir}\""
}
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