[MacPorts] #52327: Buildbot fails incorrectly if calculated dependency tree becomes invalid during installation (was: Buildbot considers a port failed if conflicting ports are active)

[MacPorts]

#52327: Buildbot fails incorrectly if calculated dependency tree becomes invalid
during installation
---------------------------+--------------------------------
  Reporter:  ryandesign@…  |      Owner:  macports-tickets@…
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  contrib       |    Version:  2.3.4
Resolution:                |   Keywords:
      Port:                |
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Comment (by cal@…):

 Build 5623 of `gnss-sdr-devel` should not have failed, because at the
 point where `gnuradio` was required by `gr-osmosdr`, `gnuradio-devel` was
 already installed and would have satisfied the dependency of `gr-osmosdr`.
 The problem is that at this point, we no longer know that `gr-osmosdr`
 would accept the already-installed `gnuradio-devel`, because we run
 dependency calculation first and then just stupidly iterate over the list.

 A solution for this problem might be complicated… basically, while
 iterating over the dependency tree and before installing a specific
 dependency, we'd have to check whether the port(s) that require(s) the
 current dependency still need it or the requirement has been satisfied
 using other means (e.g., a path:, lib:, or bin: dependency) meanwhile.
 This problem occurs more or less because we don't compute a closed form
 solution of the dependency tree before actually installing.

 To reset the incorrect state for now, you can just trigger a build of
 gnuradio directly, which will ignore the failcache but update it on
 success.

-- 
Ticket URL: <https://trac.macports.org/ticket/52327#comment:1>
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