[MacPorts] #63953: git: Configuration file is replaced on update

[MacPorts]

#63953: git: Configuration file is replaced on update
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  Reporter:  Bachsau  |      Owner:  ci42
      Type:  defect   |     Status:  reopened
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  git      |
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Comment (by herbygillot):

 Proposing a fix to this behavior with this PR: https://github.com/macports
 /macports-ports/pull/13259

 This changes things so that right when the git port is about to be
 activated, it checks whether the gitconfig exists before creating a new
 one with the osxkeychain configuration.  If the file already exists, then
 it will not overwrite.  Instead, it will check the file contents to see
 whether the desired configuration is already present in the gitconfig, and
 only adds the configuration if it isn't.

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Ticket URL: <https://trac.macports.org/ticket/63953#comment:15>
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