/usr/lib/dracut/modules.d/95cifs/cifsroot.sh is in dracut-network 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 | #!/bin/sh
type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh
. /lib/cifs-lib.sh
[ "$#" = 3 ] || exit 1
# root is in the form root=cifs://user:pass@[server]/[folder] either from
# cmdline or dhcp root-path
netif="$1"
root="$2"
NEWROOT="$3"
cifs_to_var $root
echo server: $server
echo path: $path
echo options: $options
mount.cifs //$server/$path $NEWROOT -o $options && { [ -e /dev/root ] || ln -s null /dev/root ; }
# inject new exit_if_exists
echo 'settle_exit_if_exists="--exit-if-exists=/dev/root"; rm -f -- "$job"' > $hookdir/initqueue/cifs.sh
# force udevsettle to break
> $hookdir/initqueue/work
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