[MacPorts] #21852: proc merge doesn't properly handle symlinks on Snow Leopard

[MacPorts]

#21852: proc merge doesn't properly handle symlinks on Snow Leopard
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 Reporter:  ryandesign@…             |       Owner:  ryandesign@…           
     Type:  defect                   |      Status:  new                    
 Priority:  Normal                   |   Milestone:  MacPorts 1.8.2         
Component:  base                     |     Version:  1.8.1                  
 Keywords:                           |        Port:                         
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 The "`merge`" procedure in portutil.tcl doesn't properly handle symlinks
 on Snow Leopard.

 Snow Leopard's "`file`" command dereferences symlinks by default. This
 didn't happen in previous Mac OS X versions. The "`-h`" flag could be used
 to force "`file`" not to dereference symlinks, except that this option
 does not exist in the version of "`file`" shipped with Tiger. But we can
 easily use pure tcl to detect basic types like symlinks and directories
 and not call on "`file`" until we actually need it.

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Ticket URL: <http://trac.macports.org/ticket/21852>
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