/usr/lib/dracut/modules.d/90crypt/probe-keydev.sh is in dracut 020-2.
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 | #!/bin/sh
# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
# ex: ts=8 sw=4 sts=4 et filetype=sh
. /lib/dracut-crypt-lib.sh
real_keydev="$1"; keypath="$2"; luksdev="$3"
[ -z "$real_keydev" -o -z "$keypath" ] && die 'probe-keydev: wrong usage!'
[ -z "$luksdev" ] && luksdev='*'
info "Probing $real_keydev for $keypath..."
test_dev -f "$real_keydev" "$keypath" || exit 1
info "Found $keypath on $real_keydev"
echo "$luksdev:$real_keydev:$keypath" >> /tmp/luks.keys
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