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#!/bin/bash
build() {
local m=
local -a md_devs mods
add_if_avail() {
local r= resolved=()
# treat this as an alias, since ext3 might be aliased to ext4. also, as
# of linux 3.9, we can find any filesystem by the alias "fs-$name"
# rather than having to guess at the corresponding module name.
mapfile -t resolved < <(modprobe -Ra {fs-,}"$1" 2>/dev/null)
for r in "${resolved[@]}"; do
_autodetect_cache["$r"]=1
done
}
if [[ ! -d /sys/devices ]]; then
error "/sys does not appear to be mounted. Unable to use autodetection"
return 1
fi
mapfile -t mods < <(auto_modules)
for m in "${mods[@]}"; do
_autodetect_cache["$m"]=1
done
# detect filesystem for root
if rootfstype=$(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 -T '/usr'); then
add_if_avail "$usrfstype"
fi
# scan for md raid devices
md_devs=(/sys/class/block/md*/md/level)
if [[ -e $md_devs ]]; then
quiet "found %d mdadm arrays to scan" "${#md_devs[*]}"
mapfile -t mods < <(awk '{ gsub(/raid[456]/, "raid456"); print; }' "${md_devs[@]}")
for m in "${mods[@]}"; do
_autodetect_cache["$m"]=1
done
fi
if (( ${#_autodetect_cache[*]} )); then
quiet "caching %d modules" "${#_autodetect_cache[*]}"
fi
}
help() {
cat <<HELPEOF
This hook shrinks your initramfs to a smaller size by autodetecting the 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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