[Bug 275030] buildworld fails if obj dir is NFS-mounted [patch]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275030

--- Comment #14 from Martin Birgmeier <d8zNeCFG@aon.at> ---
(In reply to Warner Losh from comment #13)

On two machines with /usr/bin/basename on UFS, the uarch bit is not set. On one
machine with a ZFS root, uarch is set on /usr/bin/basename.

Also, to minimize changing files after a buildworld, I first install into a
temporary destination and then copy over only the files which differ. And this
using tar: ( cd <tmp dir> && tar cfT - <list of changed files> ) | ( cd / &&
tar xfp -). Before this copy, the old files in / are simply removed. There are
additional steps to deal with schg files and removed files, but this is not
important here.

Summarizing, it is probably tar which sets uarch and/or root-on-zfs.

-- Martin

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