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Aditya R aadae49ad3 overlay-volumes: add support for non-volatile upperdir,workdir for anonymous volumes
Similar feature was added for named overlay volumes here: https://github.com/containers/podman/pull/12712
Following PR just mimics similar feature for anonymous volumes.

Often users want their anonymous overlayed volumes to be `non-volatile` in nature
that means that same `upper` dir can be re-used by one or more
containers but overall of nature of volumes still have to be overlay
so work done is still on a overlay not on the actual volume.

Following PR adds support for more advanced options i.e custom `workdir`
and `upperdir` for overlayed volumes. So that users can re-use `workdir`
and `upperdir` across new containers as well.

Usage

```console
podman run -it -v /some/path:/data:O,upperdir=/path/persistant/upper,workdir=/path/persistant/work alpine sh
```

Signed-off-by: Aditya R <arajan@redhat.com>
2022-06-06 18:58:42 +05:30
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