[MacPorts] #39836: when xcode license was not accepted there should be a helpful error message

[MacPorts]

#39836: when xcode license was not accepted there should be a helpful error message
-------------------------+--------------------------------
 Reporter:  fabian@…     |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.1.3
 Keywords:               |       Port:
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 For example I just installed valgrind and got this error (for some reason
 xcode didn't have the EULA marked as accepted anymore):

 $ sudo port install valgrind
 ...
 --->  Building valgrind
 Error: org.macports.build for port valgrind returned: command execution
 failed
 To report a bug, follow the instructions in the guide:
     http://guide.macports.org/#project.tickets
 Error: Processing of port valgrind failed
 frankfa at palmtree:~/repo/nativesdk (1) $ sudo port install valgrind
 --->  Computing dependencies for valgrind
 --->  Building valgrind
 Error: org.macports.build for port valgrind returned: command execution
 failed
 Please see the log file for port valgrind for details:
 /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_devel_valgrind/valgrind/main.log
 To report a bug, follow the instructions in the guide:
     http://guide.macports.org/#project.tickets
 Error: Processing of port valgrind failed

 So I
 $ cat
 /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_devel_valgrind/valgrind/main.log
 ...
 :info:build You have not agreed to the Xcode license agreements, please
 run 'xcodebuild -license' (for user-level acceptance) or 'sudo xcodebuild
 -license' (for system-wide acceptance) from within a Terminal window to
 review and agree to the Xcode license agreements.
 ...

 And the error is clear. However, for less experienced users, it might be
 very confusing. How about adding a less generic error message for this
 case, or maybe even run xcodebuild -license for the user if this happens.

-- 
Ticket URL: <https://trac.macports.org/ticket/39836>
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