[MacPorts] #31280: fuse4x-kext: move kext unload to pre-deactivate phase

[MacPorts]

#31280: fuse4x-kext: move kext unload to pre-deactivate phase
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 Reporter:  anatol.pomozov@…          |       Owner:  dports@…           
     Type:  enhancement               |      Status:  new                
 Priority:  Normal                    |   Milestone:                     
Component:  ports                     |     Version:                     
 Keywords:  haspatch                  |        Port:  fuse4x-kext        
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Comment(by anatol.pomozov@…):

 > We don't, in general, shut down running software when uninstalling a
 port.
 fuse4x kext cannot be unloaded while it is in use. User have to stop
 filesystems first.

 > Really, I'm not sure we want to unload the kext when uninstalling the
 port.
 If we uninstall fuse4x-kext then we have to uninstall fuse4x library as
 well (fuse4x depends on kext). What is the reason to run unused kext if we
 cannot use it?

 I found that this is an issue when I was switching fuse4x from macports
 <-> fuse4x from sources. So when I do "port uninstall fuse4x" then build
 and install fuse4x from sources and then run software that uses fuse4x,
 the library says "version mismatch" as running (and unused) kext from
 macports has version 0.8.12 but kext version in git repository is
 0.8.13-HEAD. So I have to unload fuse4x-kext manually. If macports on
 uninstall does the real uninstall (with kext unloading) this fixes the
 problem for me.

 > because the old version didn't have the post-deactivate hook and the new
 version didn't have the pre-activate hook
 You can insert this check twice for the transition period and later remove
 the one from pre-activate.

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Ticket URL: <https://trac.macports.org/ticket/31280#comment:3>
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