SFTP backend against Synology NAS with checksums

Folks,

I just figured out a nice way how to use sftp backend against Synology NAS with checksums without grand administation access to the used user.

So, in rclone.conf is similar:

[nas]
type = sftp
host = ...
port = ...
user = ...
pass = ...
shell_type = unix
md5sum_command = md5sum
sha1sum_command = sha1sum
path_override = @/volume1

and now the tricky part.

You must change /sbin/nologin to /bin/sh for used user in /etc/passwd on Synology.

I've tried to use a custom script which limits scope of executed commands to md5sum and sha1sum... but seems that here a fallback to /sbin/nologin.

I just discovered that each reboot of NAS resets login to /sbin/nologin.