[MacPorts] #53530: fallback to build from source when binary package not available failing when primary archive source is FTP (was: MacPorts 2.4 :: fallback to build from source when binary package not available failing for "external" repositories)

[MacPorts]

#53530: fallback to build from source when binary package not available failing
when primary archive source is FTP
----------------------------+-------------------
  Reporter:  JohnPritchard  |      Owner:
      Type:  defect         |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  base           |    Version:  2.4.0
Resolution:                 |   Keywords:
      Port:                 |
----------------------------+-------------------

Comment (by jmroot):

 Well this is interesting.
 {{{
 % curl getsize
 ftp://ftp.eso.org/pub/dfs/pipelines/repositories/stable/macports/packages
 /esopipe-isaac-datastatic/esopipe-isaac-
 datastatic-6.1.5_5.darwin_16.noarch.tbz2
 -1
 % curl getsize https://packages.macports.org/esopipe-isaac-datastatic
 /esopipe-isaac-datastatic-6.1.5_5.darwin_16.noarch.tbz2
 HTTP response code said error
 }}}
 We assume curl will throw an error when the file doesn't exist, but
 apparently it doesn't with FTP.

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Ticket URL: <https://trac.macports.org/ticket/53530#comment:3>
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