[MacPorts] #34619: prevent use of unknown subports

[MacPorts]

#34619: prevent use of unknown subports
-------------------------------------+--------------------------------------
 Reporter:  ryandesign@…             |       Owner:  macports-tickets@…                   
     Type:  defect                   |      Status:  new                                  
 Priority:  Normal                   |   Milestone:                                       
Component:  base                     |     Version:  2.1.1                                
 Keywords:                           |        Port:                                       
-------------------------------------+--------------------------------------
 It's possible to tell MacPorts to install a port with any arbitrary
 subport name, for example:

 {{{
 $ sudo port install zlib subport=foo
 Password:
 --->  Fetching distfiles for foo
 --->  Verifying checksum(s) for foo
 --->  Extracting foo
 --->  Configuring foo
 --->  Building foo
 --->  Staging foo into destroot
 --->  Installing foo @1.2.7_0
 --->  Activating foo @1.2.7_0
 Error: org.macports.activate for port foo returned: Image error:
 /opt/local/include/zconf.h is being used by the active zlib port.  Please
 deactivate this port first, or use 'port -f activate foo' to force the
 activation.
 Please see the log file for port foo for details:
 /opt/local/var/macports/logs/_Users_rschmidt_macports_dports_archivers_zlib/foo/main.log
 To report a bug, follow the instructions in the guide:
     http://guide.macports.org/#project.tickets
 Error: Processing of port zlib failed
 }}}

 You could even impersonate one port with another:

 {{{
 $ sudo port install zlib subport=expat
 --->  Fetching distfiles for expat
 --->  Verifying checksum(s) for expat
 --->  Extracting expat
 --->  Configuring expat
 --->  Building expat
 --->  Staging expat into destroot
 --->  Installing expat @1.2.7_0
 --->  Deactivating expat @2.1.0_0
 --->  Activating expat @1.2.7_0
 Error: org.macports.activate for port expat returned: Image error:
 /opt/local/include/zconf.h is being used by the active zlib port.  Please
 deactivate this port first, or use 'port -f activate expat' to force the
 activation.
 Please see the log file for port expat for details:
 /opt/local/var/macports/logs/_Users_rschmidt_macports_dports_archivers_zlib/expat/main.log
 To report a bug, follow the instructions in the guide:
     http://guide.macports.org/#project.tickets
 Error: Processing of port zlib failed
 }}}

 Obviously this only results in problems and MacPorts should prevent it.
 Expected result:

 {{{
 $ sudo port install zlib subport=foo
 Error: port zlib does not have a subport foo
 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/34619>
MacPorts <http://www.macports.org/>
Ports system for Mac OS