[MacPorts] #55502: Use size from checksums for curl progress bar when server does not supply length header

[MacPorts]

#55502: Use size from checksums for curl progress bar when server does not supply
length header
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  Reporter:  ryandesign   |      Owner:  neverpanic
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:  MacPorts 2.6.0
 Component:  base         |    Version:
Resolution:               |   Keywords:
      Port:               |
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Changes (by raimue):

 * status:  new => assigned
 * owner:   => neverpanic
 * milestone:   => MacPorts 2.6.0


Comment:

 This is reasonable, but it is not as easy as I originally thought. At the
 moment, we just rely on the progress function of curl, so we would need to
 pass the expected size to the `curl` Tcl command and then pass it through
 to the progress function to calculate the expected time. Also the
 `checksums` option is only parsed in the checksums phase, so that would
 neeed to be moved to be done earlier.

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Ticket URL: <https://trac.macports.org/ticket/55502#comment:1>
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