Why is WRKDIRPREFIX set to /usr/obj for all ports?

[interfaSys]

make.conf contains

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WRKDIRPREFIX= /usr/obj
which builds ports in /usr/obj/usr/ports/folder/port/work

The comment says "move work area out of unionfs".

What does it mean?

[franco]

This is a true story... /usr/ports is mounted into the chroot via unionfs. Building packages on top of a unionfs corrupts the package so that package installation on ZFS partitions fails. We don't know the details or have the time to inspect this further, so we have this workaround.

[interfaSys]

I'm confused... I didn't mount /usr/ports, I cloned it from the opnsense ports repo.

and I don't see any unionfs partitions

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# mount
/dev/ada0s1a on / (ufs, local, soft-updates)
devfs on /dev (devfs, local, multilabel)
devfs on /var/dhcpd/dev (devfs, local, multilabel)

Maybe we're talking about 2 different things. I'm not trying to build an image. I just want to use ports to add or recompile some packages.

[franco]

You can zap WRKDIRPREFIX for local builds. It is only used for tools.git "make ports", which runs in a chroot with the unionfs trick

[interfaSys]

Got it, thanks!