[Bug 240634] Build uses Python 2.7 on system that has Python 3.6 as default Python version

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240634

            Bug ID: 240634
           Summary: Build uses Python 2.7 on system that has Python 3.6 as
                    default Python version
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs at FreeBSD.org
          Reporter: vince at vincentbentley.co.uk

The maintenance period of Python 2.7 ends on 1 January 2020.

I noticed that building Rust under Poudriere on FreeBSD 12.0p10 uses Python 2.7
even when the build host has been configured to default to Python 3.6 .

Using Python 2.7 does not prevent building Rust successfully in 2019 but it may
become an issue in three and a half months time.

Excerpts from Poudriere build log for Rust...

--CONFIGURE_ENV--
MAKE=gmake PKG_CONFIG=pkgconf PYTHON="/usr/local/bin/python2.7"
XDG_DATA_HOME=/wrkdirs/usr/ports/lang/rust/work 
XDG_CONFIG_HOME=/wrkdirs/usr/ports/lang/rust/work 
HOME=/wrkdirs/usr/ports/lang/rust/work TMPDIR="/tmp"
PATH=/wrkdirs/usr/ports/lang/rust/work/.bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin:/root/bin
SHELL=/bin/sh CONFIG_SHELL=/bin/sh CMAKE_PREFIX_PATH="/usr/local"
--End CONFIGURE_ENV--

...

--PLIST_SUB--
RUST_TARGET=x86_64-unknown-freebsd PORTDOCS=""
PYTHON_INCLUDEDIR=include/python2.7  PYTHON_LIBDIR=lib/python2.7 
PYTHON_PLATFORM=freebsd12  PYTHON_SITELIBDIR=lib/python2.7/site-packages 
PYTHON_SUFFIX=27  PYTHON_VER=2.7  PYTHON_VERSION=python2.7 PYTHON2=""
PYTHON3="@comment " OSREL=12.0 PREFIX=%D LOCALBASE=/usr/local 
RESETPREFIX=/usr/local LIB32DIR=lib DOCSDIR="share/doc/rust" 
EXAMPLESDIR="share/examples/rust"  DATADIR="share/rust"  WWWDIR="www/rust" 
ETCDIR="etc/rust"
--End PLIST_SUB--

...

===>   Returning to build of rust-1.37.0
===>   rust-1.37.0 depends on file: /usr/local/bin/python2.7 - not found
===>   Installing existing package /packages/All/python27-2.7.16_1.txz
[s205] Installing python27-2.7.16_1...
[s205] `-- Installing libffi-3.2.1_3...
[s205] `-- Extracting libffi-3.2.1_3: .......... done
[s205] Extracting python27-2.7.16_1: .......... done

...

=======================<phase: build          >============================
===>  Building for rust-1.37.0
cd /wrkdirs/usr/ports/lang/rust/work/rustc-1.37.0-src &&  /usr/bin/env
HOME="/wrkdirs/usr/ports/lang/rust/work"  LIBGIT2_SYS_USE_PKG_CONFIG=1 
LIBSSH2_SYS_USE_PKG_CONFIG=1  OPENSSL_DIR="/usr"  /usr/local/bin/python2.7
/wrkdirs/usr/ports/lang/rust/work/rustc-1.37.0-src/x.py build  --verbose 
--config ./config.toml  --jobs 4

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