RFE: Automatically set nodatacow on $pooldir when on btrfs

[cmurf]

Summary: Btrfs upstream advises VM images use nodatacow, therefore make sure chattr +C is set on the openqa directory (at create time).

Background: On (open)SUSE, /var has nodatacow file attribute C set at installation time. But most other distros don't do this, including Fedora. Meanwhile, libvirt now checks if a dir pool is on btrfs and by default sets the nodatacow file attribute.
https://listman.redhat.com/archives/libvir-list/2020-July/205982.html

Since libvirt isn't being used here, I think it's reasonable to just unconditionally set nodatacow file attribute on btrfs whenever creating a new parent directory to be used for openqa. Any new dirs and files, including qcow2, will inherit this file attribute.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This Pull Request has been automatically closed as it did not have any activity in the last 97 days. Thank you.

[okurz]

Reopening as likely still valid. Also I created https://progress.opensuse.org/issues/117136 to prevent the stale bot to close issues which are still valid.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[kalikiana]

Reopening as likely still valid. Also I created https://progress.opensuse.org/issues/117136 to prevent the stale bot to close issues which are still valid.

It doesn't look like this worked. At least this issue was still marked as stale. 🤔

[okurz]

yes, but the PR is only marked as stale, not closed. That's what we wanted.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.