tinyramfs/device-helper

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#!/bin/sh -f
#
# create /dev/disk/by-* and /dev/mapper/* symlinks
create_symlink()
{
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dir="$1"; sym="$2"
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sym="${sym%\"}"
sym="${sym#\"}"
sym="${dir}/${sym}"
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mkdir -p "$dir"
ln -s "../../${dev_name}" "$sym"
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}
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# DEVPATH is part of uevent which is exported to environment by device manager.
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[ -b "/dev/${dev_name=${DEVPATH##*/}}" ] || exit 1
exec > /dev/null 2>&1
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read -r dm_name < "/sys/block/${dev_name}/dm/name" && {
mkdir -p /dev/mapper
ln -sf "../${dev_name}" "/dev/mapper/${dm_name:?}"
}
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command -v blkid || exit 0
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# Race condition may occur if uevent arrives faster(isn't that a kernel bug!?)
# than the kernel initializes device. This prevents blkid to fetch data from
# device. To fix this, we simply waiting until blkid is succeeded.
while ! blkid "/dev/${dev_name}"; do
if [ "$((count += 1))" = 30 ]; then
exit 1
else
sleep 1
fi
done
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for line in $(blkid "/dev/${dev_name}"); do case "${line%%=*}" in
UUID) create_symlink /dev/disk/by-uuid "${line##*=}" ;;
LABEL) create_symlink /dev/disk/by-label "${line##*=}" ;;
PARTUUID) create_symlink /dev/disk/by-partuuid "${line##*=}" ;;
esac; done