/usr/lib/dracut/modules.d/95rootfs-block/parse-block.sh is in dracut 040+1-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | #!/bin/sh
case "$root" in
block:LABEL=*|LABEL=*)
root="${root#block:}"
root="$(echo $root | sed 's,/,\\x2f,g')"
root="block:/dev/disk/by-label/${root#LABEL=}"
rootok=1 ;;
block:UUID=*|UUID=*)
root="${root#block:}"
root="${root#UUID=}"
root="$(echo $root | tr "[:upper:]" "[:lower:]")"
root="block:/dev/disk/by-uuid/${root#UUID=}"
rootok=1 ;;
block:PARTUUID=*|PARTUUID=*)
root="${root#block:}"
root="${root#PARTUUID=}"
root="$(echo $root | tr "[:upper:]" "[:lower:]")"
root="block:/dev/disk/by-partuuid/${root}"
rootok=1 ;;
block:PARTLABEL=*|PARTLABEL=*)
root="${root#block:}"
root="block:/dev/disk/by-partlabel/${root#PARTLABEL=}"
rootok=1 ;;
/dev/*)
root="block:${root}"
rootok=1 ;;
esac
[ "${root%%:*}" = "block" ] && wait_for_dev "${root#block:}"
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