dracut/modules.d/95rootfs-block/block-genrules.sh

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if [ "${root%%:*}" = "block" ]; then
(
printf 'KERNEL=="%s", SYMLINK+="root"\n' \
${root#block:/dev/}
printf 'SYMLINK=="%s", SYMLINK+="root"\n' \
${root#block:/dev/}
) >> /etc/udev/rules.d/99-mount.rules
printf '[ -e "%s" ] && { ln -s "%s" /dev/root 2>/dev/null; rm "$job"; }\n' \
"${root#block:}" "${root#block:}" >> /initqueue-settled/blocksymlink.sh
echo '[ -e /dev/root ]' > /initqueue-finished/block.sh
fi