systemdspawner

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Here are the details of the dynamic user created.

(base) [root@jupyter jupyterenv]# getent passwd jupyter-someuser-singleuser
jupyter-someuser-singleuser:*:65492:65492:Dynamic User:/:/sbin/nologin
(base) [root@jupyter jupyterenv]# 

And here is one of the issues it causes.

[jupyter-someuser-singleuser@jupyter ~]$ ssh-keygen 
Generating public/private rsa key pair.
Enter file in which to save the key (//.ssh/id_rsa): 
Could not create directory '//.ssh': Read-only file system
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Saving key "//.ssh/id_rsa" failed: No such file or directory
[jupyter-someuser-singleuser@jupyter ~]$ 

Here are the relevant variables.

USER=jupyter-someuser-singleuser
PWD=/var/lib/someuser
HOME=/var/lib/someuser
MAIL=/var/spool/mail/jupyter-someuser-singleuser
LOGNAME=jupyter-someuser-singleuser

How do I configure systemdspawner to set users to the correct home directory?

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Looks like this is an old existing issue with systemd..

https://github.com/systemd/systemd/issues/9652

Looks like this is an old existing issue with systemd..

systemd/systemd#9652

No, it is an entirely different issue. @simonello pasted the output of getent - user entries exist, but contain incorrect information.