Unable to start container if user is managed by Active Directory (contains @ "at" sign)

[Mazwak]

Describe the bug

If I try to enter a toolbox and my username contains '@', it fails with:
Error: invalid entry point PID of container test

If I try to attach with podman, the error is more obvious:
passwd: Libuser error at line: 210 - name contains invalid char `@'.
Error: failed to remove password for user [email protected]: failed to invoke passwd(1)

Steps how to reproduce the behaviour
Create a user with '@' in it.
toolbox create test
toolbox enter test

Expected behaviour
Entering the toolbox without error, at best.
Failing with a usefull message, at least.

Actual behaviour
Fails with a useless message.
I agree with #691 (comment) that debug info did not help at all.
Only trying with podman, after reading #691 (comment) did help.

Output of toolbox --version (v0.0.90+)

toolbox version 0.0.99.3

Toolbox package info (rpm -q toolbox)

toolbox-0.0.99.3-2.fc35.x86_64

Output of podman version
e.g.,

Version:      3.4.4
API Version:  3.4.4
Go Version:   go1.16.8
Built:        Wed Dec  8 22:45:07 2021
OS/Arch:      linux/amd64

Podman package info (rpm -q podman)

podman-3.4.4-1.fc35.x86_64

Info about your OS
Fedora Silverblue 35

Additional context

My user is imported from ActiveDirectory, and thus is [email protected].

[yrro]

The problem is really the usermod command. I can toolbox enter debian-10 just fine, which ships shadow-utils 4.5; but toolbox-enter centos-stream8, which ships shadow-utils 4.6, gives me this error. Additionally I've noticed in the man page that usernames are limited to 32 characters, which is way too short for many users in an Active Directory environment!

But Toolbox can't do anything to fix the usermod command in dozens of old versions of distros. So what else could it do; detecting that useradd has failed, and re-running it with a modified username that is known to be accepted by usermod would be one approach.

[debarshiray]

Duplicate of #585

[debarshiray]

Closing. Thanks for your interest in Toolbx and digging into this!

[yrro]

Thanks. Apologies for not finding the duplicate issue...