[MacPorts] #61192: Lots of golang ports are downloading dependencies at build time

[MacPorts]

#61192: Lots of golang ports are downloading dependencies at build time
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  Reporter:  amake   |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:          |
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Comment (by amake):

 `go2port` is very much a "best effort" tool :(

 I just had a go at fixing the `glow` port and noted the following tricky
 parts:

 1. go2port 20200217 will duplicate some dependencies. I just fixed this
 and pushed an update to the port, so you should see it soon.
 2. There were some checksum mismatches as you mentioned; surprisingly
 enough it seemed like GitHub sometimes served truncated tarballs, because
 deleting and re-downloading fixed it. This is quite troubling, but I'm not
 sure what I can do about it.
 3. Simply pasting the generated `go.vendors` block is not enough; you also
 have to give the main distfile a filename. Until you do so, the checksum
 phase will fail in a way that makes it look like issue (2) above.

 One issue you might run into is that custom domains are generally not
 supported by either `go2port` or the golang portgroup*. So far all the
 packages with custom domains I've seen have been mere redirects to a
 supported domain like github.com. If you encounter something else then it
 might be quite difficult to handle.

 *Someone has [[https://github.com/amake/go2port/pull/3|offered a patch]]
 to support arbitrary domains in `go2port` but since the golang portgroup
 would also need a lot of work I haven't yet properly reviewed it.

-- 
Ticket URL: <https://trac.macports.org/ticket/61192#comment:4>
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