[MacPorts] #57464: Builtbot: Don't keep huge ports installed

[MacPorts]

#57464: Builtbot: Don't keep huge ports installed
---------------------------+---------------------
 Reporter:  ryandesign     |      Owner:  admin@…
     Type:  enhancement    |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  buildbot/mpbb  |    Version:
 Keywords:                 |       Port:
---------------------------+---------------------
 Our buildbot setup currently keeps all built ports installed on each
 worker. This is supposed to speed up builds so that we don't waste time
 constantly downloading and installing ports that are dependencies of a lot
 of other ports.

 But there are also some inordinately large ports, such as some games,
 which aren't commonly used as dependencies. Here are some of the larger
 ports installed on the highsierra buildbot worker:

 {{{
 $ cd /opt/local/var/macports/software
 $ du -sch alienarena-data/* geant*-data/* knp/* supertuxkart/* texlive-
 latex-extra/* typesafe-activator/* wesnoth/*
 551M    alienarena-data/alienarena-
 data-7.66-20130827_0.darwin_16.noarch.tbz2
 427M    geant4.10.0-data/geant4.10.0-data-4.10.0_0.darwin_16.noarch.tbz2
 428M    geant4.10.1-data/geant4.10.1-data-4.10.1_0.darwin_16.noarch.tbz2
 432M    geant4.10.2-data/geant4.10.2-data-4.10.2_1.darwin_16.noarch.tbz2
 1005M   geant4.10.3-data/geant4.10.3-data-4.10.3_0.darwin_16.noarch.tbz2
 1.1G    geant4.10.4-data/geant4.10.4-data-4.10.4_0.darwin_16.noarch.tbz2
 266M    geant4.9.6-data/geant4.9.6-data-4.9.6_0.darwin_16.noarch.tbz2
 1.0G    knp/knp-4.14_0.darwin_16.x86_64.tbz2
 512M    supertuxkart/supertuxkart-0.9.3_0.darwin_16.x86_64.tbz2
 453M    texlive-latex-extra/texlive-latex-extra-
 47410_0+doc.darwin_16.noarch.tbz2
 663M    typesafe-activator/typesafe-
 activator-1.3.12_0.darwin_16.noarch.tbz2
 365M    wesnoth/wesnoth-1.12.6_2.darwin_16.x86_64.tbz2
 7.1G    total
 }}}

 It's getting to the point where builds are failing because there's not
 enough free disk space, and I am manually uninstalling some of these ports
 on the buildbot workers to free up space. If we could have mpbb
 automatically uninstall large ports, it would free up a good deal of disk
 space.

 I'm not sure what do about dependencies. For example, geant4.10.4 is not
 large, but it depends on geant4.10.4-data which is.

 Do we force the uninstallation of the large ports, leaving the ports
 depending on them broken, on the assumption that when the buildbot asks to
 install them again it will reinstall the dependencies and fix them?

 Or do we have the buildbot uninstall not only the large ports but also all
 ports depending on them? That would be good for geant, but bad for
 texlive-latex-extra, on which lots of things depend. We could base the
 decision of whether to uninstall on how many ports would be uninstalled.
 (It it's, say, 5 or fewer ports, uninstall them, otherwise leave them
 installed.)

 Or do we instead make a general rule (not based on size) that we don't
 keep a port installed if nothing depends on it?

 Some of these ports might not be distributable. Once we have [ticket:54800
 nondistributable archives available on a private server] that won't be a
 big problem anymore. We can wait until we resolve that ticket before
 deploying an implementation for this one.

-- 
Ticket URL: <https://trac.macports.org/ticket/57464>
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