start-sshd.sh script is executed multiple times when starting the controller

[markusweigelt]

When the container is restarted without being removed, the start-sshd.sh script runs again.

The problem is that all configurations are appended to the configuration files, such as /.ssh/authorized_keys, /.ssh/rc, etc.

[bertsky]

Indeed! That is despite Dockerfile(5)'s documentation for CMD stating

The CMD instruction sets the command to be executed when running a container from an image.

Obviously, in fact CMD is executed when starting a container, which is subtly different.

[bertsky]

So what we have to do is check (in all these cases) if the file has already been written to last time.

[markusweigelt]

Perhaps here, simply checking for the existence of the file would suffice.

[bertsky]

perhaps here, simply checking for the existence of the file would suffice.

In the case of /.ssh/rc – yes, but for authorized_keys and passwd – no.

[markusweigelt]

Ok, but we can use /.ssh/rc as base condition to check if start-sshd.sh has already run. So, I think explicitly checking the other files is not necessary.

[bertsky]

Oh, right!