[MacPorts] #57396: Use hfscompression on buildbot

[MacPorts]

#57396: Use hfscompression on buildbot
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  Reporter:  ryandesign     |      Owner:  admin@…
      Type:  enhancement    |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  buildbot/mpbb  |    Version:
Resolution:                 |   Keywords:
      Port:                 |
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Comment (by ryandesign):

 Some success: In the tools prefix, I installed libarchive, then
 uninstalled inactive ports, deactivated all ports, activated libarchive,
 and activated inactive ports. This saved 3-4GB of space on the 10.6-10.9
 workers. There was only negligible savings on the 10.10-10.14 workers
 because they don't have any clang ports installed.

 So I imagine if I followed your suggestion and put a symlink of the tools
 prefix's libarchive's bsdtar in a directory by itself and added that
 directory to the main prefix's binpath, that would save at least 3-4GB of
 space when buildbot was building a port that required MacPorts clang,
 though incurring additional CPU time for all builds for compression and
 decompression. Maybe [ticket:57464 not keeping large and/or leaf ports
 installed] would provide better savings without needing to incur that CPU
 penalty.

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Ticket URL: <https://trac.macports.org/ticket/57396#comment:7>
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