* Clients no longer mount ports/src trees via NFS (even the FreeBSD.org
local clients). This was putting too much load on the server and
slowing down builds.
* Instead ports and src .tbz files are pushed to the clients and
unpacked. MD5 checksums are used to verify correctness
* -force forces re-extraction of the tarballs even if they exist and
appear to be checked out
* Also unpack the compressed bindist
TODO: When we are not using md or ZFS builds it would be even faster
to keep an unpacked copy of the bindist on the scratch filesystem and
hardlink the files into the target directory
tells us whether the node has NFS access to the master.
* Also copy the bindist-$(hostname).tar file to allow local
customization of the build chroots (e.g. resolv.conf and make.conf
files for disconnected systems)
* For disconnected hosts, we don't copy the bindist files from the
master, but just set up the local directories and let the server rsync
them into place later. Also set up dangling symlinks to the bindist
files in the build area, which will be filled in by the server too (in
the NFS case it makes sense to cache the bindist files locally to
avoid extra NFS traffic, but here we know the file is local so a
symlink is fine)
* Remove an apparently spurious 'killall fetch' that snuck in for what
were probably transient reasons.
* Forcibly clean up old chroot directories since we are preparing to
start another build and don't want old (possibly orphaned) builds to
skew the job scheduling or use up resources.
* Require an additional <tmpdir> argument so the client knows where its
temp directory is.
* Mount the portbuild directory readonly via NFS, and copy files that
way instead of via scp, which has too much overhead
