Find existing quadlets more precisely

[traylenator]

Pull Request (PR) description

During validation of a new quadlet the existing quadlet must be copied to an ephemeral directory.

This could fail with:

cp: -r not specified; omitting directory '/etc/containers/systemd/users'

The extra directory should not be copied. The files to be copied with be of the form my.pod, my.container, ...

Particularly on Ubuntu and Debian the directory /etc/containers/systemd/users exists to store system provided user quadlets and that directory should be ignored.

Change is:

echo /etc/containers/systemd/*
/etc/containers/systemd/busybox.image /etc/containers/systemd/centos.container /etc/containers/systemd/good.volume /etc/containers/systemd/kubeycentos.kube /etc/containers/systemd/podcentos.pod /etc/containers/systemd/users

vs

echo /etc/containers/systemd/*.*
/etc/containers/systemd/busybox.image /etc/containers/systemd/centos.container /etc/containers/systemd/good.volume /etc/containers/systemd/kubeycentos.kube /etc/containers/systemd/podcentos.pod

[traylenator]

This is the wrong strategy completly - I missed that. QUADLET_UNIT_DIRS can be set as multiple paths.

env QUADLET_UNIT_DIRS=/xyz/foo:/abc/bar /usr/lib/systemd/user-generators/podman-user-generator --dryrun
quadlet-generator[5085]: Error occurred resolving path "/xyz/foo": lstat /xyz: no such file or directory
quadlet-generator[5085]: Error occurred resolving path "/abc/bar": lstat /abc: no such file or directory
quadlet-generator[5085]: No files parsed from [/xyz/foo /abc/bar]

[traylenator]

#72 is much better solution to this.