tinyramfs/device-helper

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#!/bin/sh -f
#
# create /dev/disk/by-* and /dev/mapper/* symlinks
create_symlink()
{
typ="$1"; sym="$2"
sym="${sym%\"}"
sym="${sym#\"}"
sym="/dev/disk/by-${typ}/${sym}"
mkdir -p "${sym%/*}"
ln -s "../../${dev_name}" "$sym"
}
# DEVPATH is part of uevent which is exported to environment by device manager.
[ -b "/dev/${dev_name=${DEVPATH##*/}}" ] || exit 1
exec > /dev/null 2>&1
read -r dm_name < "/sys/block/${dev_name}/dm/name" && {
mkdir -p /dev/mapper
ln -sf "../${dev_name}" "/dev/mapper/${dm_name:?}"
}
command -v blkid || exit 0
# Race condition may occur if uevent arrives faster(isn't that a kernel bug!?)
# than the kernel initializes device. This prevents blkid to fetch data from
# device. To fix this, we simply waiting until blkid is succeeded.
while ! _blkid=$(blkid "/dev/${dev_name}"); do
if [ "$((count += 1))" = 10 ]; then
exit 1
else
sleep 1
fi
done
for line in $_blkid; do case "${line%%=*}" in
UUID) create_symlink uuid "${line##*=}" ;;
LABEL) create_symlink label "${line##*=}" ;;
PARTUUID) create_symlink partuuid "${line##*=}" ;;
esac; done