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#!/bin/bash
build() {
local -a md_devs
MODULE_FILE=$workdir/autodetect_modules
add_if_avail() {
local resolved
# treat this as an alias, since ext3 might be aliased to ext4.
IFS=$'\n' read -rd '' -a resolved < \
<(modprobe -S "$KERNELVERSION" -R "$1" 2>/dev/null)
if (( ${#resolved[*]} )); then
printf '%s\n' "${resolved[@]}" >>"$MODULE_FILE"
fi
}
if [[ ! -d /sys/devices ]]; then
error "/sys does not appear to be mounted. Unable to use autodetection"
return 1
fi
auto_modules >"$MODULE_FILE"
# detect filesystem for root
if rootfstype=$(findmnt -uno fstype '/'); then
add_if_avail "$rootfstype"
else
error "failed to detect root filesystem"
fs_autodetect_failed=1
fi
# detect filesystem for separate /usr
if usrfstype=$(findmnt -snero fstype --tab-file '/etc/fstab' /usr); then
add_if_avail "$usrfstype"
fi
# scan for md raid devices
md_devs=(/sys/class/block/md*/md/level)
if [[ -e $md_devs ]]; then
(( !QUIET )) && plain "found %d mdadm arrays to scan" "${#md_devs[*]}"
awk '{ gsub(/raid[456]/, "raid456"); print; }' "${md_devs[@]}" | sort -u >>"$MODULE_FILE"
fi
if (( !QUIET )) && [[ -s $MODULE_FILE ]]; then
plain "caching %d modules" $(wc -l < "$MODULE_FILE")
fi
}
help() {
cat <<HELPEOF
This hook shrinks your initramdisk to a smaller size by autodetecting your
needed modules. Be sure to verify included modules are correct and none are
missing. This hook must be run before other subsystem hooks in order to take
advantage of auto-detection. Any hooks placed before 'autodetect' will be
installed in full.
HELPEOF
}
# vim: set ft=sh ts=4 sw=4 et:
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