[MacPorts] #54180: documentation for new portfile with git HEAD no tarball

[MacPorts]

#54180: documentation for new portfile with git HEAD no tarball
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  Reporter:  gaming-hacker  |      Owner:
      Type:  enhancement    |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  guide          |    Version:
Resolution:                 |   Keywords:
      Port:                 |
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Comment (by ryandesign):

 We never create ports that fetch from the HEAD of a repository. They
 should always fetch from a specific repeatable commit. Ports for software
 that is hosted on github usually want to use the github portgroup. Read
 the documentation in the comments at the top of that portgroup file.

 The [https://guide.macports.org/#development.creating-portfile guide
 shows] a method for computing checksums.

 Ports for software that uses cmake usually want to use the cmake
 portgroup. You can look at other ports that use that portgroup for help on
 how to pass "configure flags" to cmake.

 Please ask on the macports-dev mailing list if you need help with this or
 other portfile development topics.

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Ticket URL: <https://trac.macports.org/ticket/54180#comment:3>
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