[MacPorts] #60608: Update MacPorts base using HTTP

[MacPorts]

#60608: Update MacPorts base using HTTP
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 Reporter:  neverpanic   |      Owner:  neverpanic
     Type:  enhancement  |     Status:  assigned
 Priority:  Normal       |  Milestone:  MacPorts Future
Component:  base         |    Version:
 Keywords:               |       Port:
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 In #60590, we again noticed that our current method to update MacPorts
 base source code via rsync is not optimal, since we do not have automatic
 fallbacks to other mirrors should our main mirror be unavailable.

 Additionally, the use of rsync is (a) not transport encrypted, and (b)
 often requires special care for the proxy configuration, while the proxy
 configuration for HTTP is usually already set.

 Syncing the entire source code via rsync and only then checking the
 current version in a file in the downloaded source tree is also rather
 slow, compared to directly checking the current version from some online
 source.

 We should switch to using pure HTTP to check for the current version, and
 then download a tarball of the new version once it is available.
 Obviously, the signature checking that is currently in place will need to
 be kept.

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Ticket URL: <https://trac.macports.org/ticket/60608>
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