> > Hi Amir,
> >
> > Do you want to mention a word upper dir also when UNIONMOUNT_BASEDIR. That
> > is upperdir is also created under UNIONMOUNT_BASEDIR. IOW, all directories
> > lower, upper and mount point are under UNIONMOUNT_BASEDIR (until and
> > unless overridden by other environment variables).
>
Hi Vivek,
Please approve this text before I update master.
Pushed this work to branch 'envvars'
Thanks,
Amir.
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The following environment variables are supported:
UNIONMOUNT_BASEDIR - parent dir of all samefs layers (default: /base)
UNIONMOUNT_LOWERDIR - lower layer path for non samefs (default: /lower)
UNIONMOUNT_MNTPOINT - mount point for executing tests (default: /mnt)
When user provides UNIONMOUNT_LOWERDIR:
1) Path should be an existing directory whose content will be deleted.
2) Path is assumed to be on a different filesystem than base dir, so
--samefs setup is not supported.
When user provides UNIONMOUNT_BASEDIR:
1) Path should be an existing directory whose content will be deleted.
2) Upper layer and middle layers will be created under base dir.
3) If UNIONMOUNT_MNTPOINT is not provided, the overlay mount point will
be created under base dir.
4) If UNIONMOUNT_LOWERDIR is not provided, the lower layer dir will be
created under base dir.
5) If UNIONMOUNT_LOWERDIR is not provided, the test setup defaults to
--samefs (i.e. lower and upper layers are on the same base fs).
However, if --maxfs=<M> is specified, a tmpfs instance will be mounted
on the lower layer dir that was created under base dir.
