[MacPorts] #55136: sudo port -d upgrade outdated hangs

[MacPorts]

#55136: sudo port -d upgrade outdated hangs
------------------------+-------------------
  Reporter:  micrology  |      Owner:
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  base       |    Version:  2.4.2
Resolution:             |   Keywords:
      Port:             |
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Comment (by micrology):

 Replying to [comment:2 ryandesign]:
 > MacPorts 2.4.2 contains minimal changes from 2.4.1 and can't really be
 causing such a problem. We're of course running 2.4.2 on our build servers
 where we don't see such a problem there.
 >
 > I notice the log mentions apache2. A significant update was recently
 committed to apache2 which updated it to version 2.4.x and changed its
 layout, which required all ports using apache2 to be modified and rebuilt.
 This upgrade should go smoothly; not sure why you're having difficulties.
 When you say it hangs, how long did you wait? Not that it should take very
 long when working correctly. Do you get the same hang if you try upgrading
 apache2 specifically? (`sudo port upgrade apache2`) What about upgrading
 other individual specific ports shown in `port outdated`?

 Thanks for the comments.

 Specifically, I waited several hours for the hang to clear.

 When I try to upgrade just apache2, I get the same hang (and the same
 Debug trace).

 I then tried to upgrade another port shown as needing an upgrade – and
 again got the same hang.  Debug output follows:

 {{{
 sudo port -d upgrade curl
 DEBUG: Copying /Users/scs1ng/Library/Preferences/com.apple.dt.Xcode.plist
 to /opt/local/var/macports/home/Library/Preferences
 DEBUG: epoch: in tree: 0 installed: 0
 DEBUG: curl 7.56.0_0 exists in the ports tree
 DEBUG: curl 7.55.1_0 +ssl is the latest installed
 DEBUG: curl 7.55.1_0 +ssl is active
 DEBUG: Merging existing variants '+ssl' into variants
 DEBUG: new fully merged portvariants: ssl +
 DEBUG: Changing to port directory:
 /opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/net/curl
 DEBUG: OS darwin/14.5.0 (Mac OS X 10.10) arch i386
 DEBUG: Reading variant descriptions from
 /opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/_resources/port1.0/variant_descriptions.conf
 DEBUG: Sourcing PortGroup muniversal 1.0 from
 /opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/_resources/port1.0/group/muniversal-1.0.tcl
 DEBUG: universal variant already exists, so not adding the default one
 DEBUG: Executing variant ssl provides ssl
 DEBUG: Running callback portconfigure::add_automatic_compiler_dependencies

 }}}

 Note that it ends/hangs at the same point as with apache2.

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Ticket URL: <https://trac.macports.org/ticket/55136#comment:3>
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