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Use makefs(8) in release VM-image generation instead of mdconfig/newfs/etc.

Authored by nwhitehorn on Feb 24 2021, 3:27 PM.



This patch changes release VM image generation to use makefs(8) instead of using md(4), then newfs, and mounting and unmounting things many times. This provides a number of benefits:

  • Simpler generation of images (the patch is net-negative): no need to attach md(4) devices and mount and unmount things
  • Reduced privileges needed: if not for needing to have devfs mounted in the image at a few points, could do this in a zero-privilege jail
  • Can generate cross-endian file systems: this enables generation of powerpc64 VM images (tested and working) on amd64 hosts

I have tested generation of amd64 and powerpc64 images and they work as before, with identical file system parameters and organization.

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rG FreeBSD src repository
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Automatic diff as part of commit; unit tests not applicable.

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nwhitehorn created this revision.

No objection, but please do not target this for releng/13.0 (13.0-RELEASE), as it is my opinion it is too late for such a change at this point in the cycle.

This revision is now accepted and ready to land.Feb 24 2021, 3:35 PM

Just committed this. I agree about 13.0 -- I was planning to merge to stable/13 after 13.0 has branched and smoke-test this in HEAD for a bit in the meantime.