[MacPorts] #33037: background archiving

[MacPorts]

#33037: background archiving
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 Reporter:  dave@…             |       Owner:  macports-tickets@…                   
     Type:  enhancement        |      Status:  new                                  
 Priority:  Normal             |   Milestone:                                       
Component:  base               |     Version:  2.0.3                                
 Keywords:                     |        Port:                                       
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Comment(by ryandesign@…):

 Note also that using xz as your archive type is problematic if your only
 copy of the xz program comes from MacPorts. I don't know if Lion includes
 a copy of xz, but I know that Snow Leopard and earlier do not. The problem
 arises when you try to upgrade the xz port. During the install phase,
 MacPorts creates an archive of the destroot, using, as you requested, xz-
 compressed tarball format. Then in the deactivate phase, it deactivates
 your existing copy of xz (meaning the xz program gets deleted). Then the
 activation phase fails because there's no xz program available to
 decompress the new archive. It becomes even more fun when you realize you
 can no longer install or activate any port at all. To recover, you would
 have to clean the xz port, set the archive type back to bz2, and rebuild
 xz, letting it this time install a bz2 archive, which OS X's bzip2 program
 can decompress.

 Copying the destroot, as cal suggested above, would work around this
 particular problem, but it would mean that the activation code would have
 to have two codepaths -- one for when you're using a pre-existing binary
 archive (extract it), and one for when you're building from source (copy
 the destroot). You can't just always copy the destroot, because when using
 an existing binary archive, there is no destroot; the fetch, extract,
 patch, configure, build and destroot phases aren't even run.

-- 
Ticket URL: <https://trac.macports.org/ticket/33037#comment:3>
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