[Bug 222389] ports-mgmt/synth: Fails to test proposed update of mail/postfix-policyd-spf-python

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222389

            Bug ID: 222389
           Summary: ports-mgmt/synth: Fails to test proposed update of
                    mail/postfix-policyd-spf-python
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: yasu at utahime.org
                CC: ericturgeon.bsd at gmail.com
                CC: ericturgeon.bsd at gmail.com

Created attachment 186455
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=186455&action=edit
synth build log of mail/postfix-policyd-spf-python

About 2 months ago I submitted update of mail/postfix-policyd-spf-python as bug
#220706. But it was hold off because of known issue of poudriere. That is,
while 'cd /usr/ports/mail/postfix-policyd-spf-python && make install' works
fine without any errors, 'poudriere testport -o
mail/postfix-policyd-spf-python' fails due to the issue reported in bug
#206067. This is an introduction of this PR.

And today I wonder if synth can build my update. So I installed synth,
configured it and tried 'synth test mail/postfix-policyd-spf-python'. But it
failed as following:

root at rolling-vm-freebsd1[1646]# synth test mail/postfix-policyd-spf-python
Stand by, building pkg(8) first ... done!




The task is complete.  Final tally:
Initial queue size: 15
    packages built: 14
           ignored: 0
           skipped: 0
            failed: 1

Duration: 00:05:00
The build logs can be found at: /usr0/synth/NoCustomization/log                
                                             root at rolling-vm-freebsd1[1647]# 

By checking build log of mail/postfix-policyd-spf-python (it is attached to
this PR) and listing built packages in repository directory, I am convinced
that syth has same issue as poudriere. That is.

1. mail/postfix-policyd-spf-python has run-time dependency on mail/py-pyspf and
mail/py-authres. So synth also build these ports.
2. mail/postfix-policyd-spf-python is Python 3 only ports (USES=python:3.3+).
So synth build it as package for default Python 3 version, that is, 3.6.
3. Since mail/postfix-policyd-spf-python is built as Python 3.6 package,
depending ports (mail/py-pyspf, maii/py-authres and there dependencies) also
have to be built as Python 3.6 packages.
4. But mail/py-pyspf, mail/py-authres and etc themselves are compatible with
all supported Python versions (USE=python). So synth build them as package for
default Python version, that is, 2.7.
5. So when synth completed build of all dependencies and start building
mail/postfix-policyd-spf-python, there are no required Python 3.6 packages in
repository, and it results in build failure.

After all it seems the root of this issue is that synth builds depending ports
as if they were master one. So in order to fix this issue synth must be changed
so requirements of master port are inherited to build of dependencies in some
way.

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