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

[MacPorts]

#57464: Buildbot: Don't keep huge ports installed
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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 jmroot):

 Replying to [comment:12 ryandesign]:
 > Also uninstall ports with only 1 dependent

 Unfortunately this can be quite inefficient in certain cases. Port A may
 have only one dependent B, but B may have a large number of dependents,
 and A is installed and uninstalled each time one of B's dependents is
 built. One specific example:
 {{{
 % port echo depends:py39-roman
 py39-docutils
 % port echo rdepends:py39-docutils | wc -l
 114
 }}}

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Ticket URL: <https://trac.macports.org/ticket/57464#comment:14>
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