[MacPorts] #31122: MPM-ITK support for apache2 port

[MacPorts]

#31122: MPM-ITK support for apache2 port
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 Reporter:  cal@…             |       Owner:  ryandesign@…           
     Type:  enhancement       |      Status:  new                    
 Priority:  Normal            |   Milestone:                         
Component:  ports             |     Version:  2.0.2                  
 Keywords:  haspatch          |        Port:  apache2                
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 Please find attached a patchfile adding support for the (experimental) itk
 multiprocessing module to the apache2 port.

 I couldn't use the standard method to patch the files, because the mpm-itk
 patch requires patch.args -p1 but the other patches in $(port dir
 apache2)/files do not and I neither wanted to modify the upstream mpm-itk
 patch nor the existing patchfiles. Also, the mpm-itk patch needs to be
 patched to apply correctly (which is what mpmitk-fix-add-mpm-to-build-
 system.patch does).

 MPM-ITK is essentially a fork of the prefork MPM allowing to use different
 UIDs for different VirtualHosts. In order to do this, Apache needs to be
 able to setuid() after matching a request to its VirtualHost and will thus
 have to run as root. The user ID can be specified using the AssignUserID
 directive and defaults to the value of User if AssignUserID was not given
 (this means requests will never be served as root!).

 For more information about MPM-ITK go to http://mpm-itk.sesse.net/.

 This might be an alternative solution for #10511.

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Ticket URL: <https://trac.macports.org/ticket/31122>
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