port: new action_environment and/or environment mode

[Bradley Giesbrecht]

I opened a ticket for this simple base patch:
https://trac.macports.org/ticket/47442

My knowledge of tcl and base is limited, I know my code needs cleanup and tests. Looking for feedback to decide if I should continue.

The goal is a simpler way for users to provide env vars.

Votes up or down if you think this is worth the bloat will be appreciated. 


Example 1:
$ port -e version
--->  /opt/local/etc/macports/macports.conf: prefix: /opt/local
--->  /opt/local/etc/macports/macports.conf: portdbpath: /opt/local/var/macports
--->  /opt/local/etc/macports/macports.conf: applications_dir: /Applications/MacPorts
--->  /opt/local/etc/macports/macports.conf: frameworks_dir: /opt/local/Library/Frameworks
--->  /opt/local/etc/macports/macports.conf: sources_conf: /opt/local/etc/macports/sources.conf
--->  /opt/local/etc/macports/macports.conf: variants_conf: /opt/local/etc/macports/variants.conf
--->  /opt/local/etc/macports/macports.conf: universal_archs: x86_64 i386
--->  /opt/local/etc/macports/macports.conf: revupgrade_autorun: no
--->  /opt/local/etc/macports/sources.conf: file:///opt/local/var/macports/sources/svn.macports.org/trunk/dports default
--->  /opt/local/etc/macports/sources.conf: file:///Users/brad/misc/macports/users/gaurav/pypi2port/dports nosync
Version: 2.3.99

Example 2:
$ port env
--->  port_cmd_version:  2.3.99
--->  bootstrap_options: applications_dir: /Applications/MacPorts
--->  bootstrap_options: build_arch: x86_64
--->  bootstrap_options: buildmakejobs: 0
--->  bootstrap_options: buildnicevalue: 0
--->  bootstrap_options: ccache_dir: /opt/local/var/macports/build/.ccache
--->  bootstrap_options: ccache_size: 2G
--->  bootstrap_options: configureccache: no
--->  bootstrap_options: configuredistcc: no
--->  bootstrap_options: configurepipe: yes
--->  bootstrap_options: cxx_stdlib: libc++
--->  bootstrap_options: delete_la_files: yes
--->  bootstrap_options: destroot_umask: 022
--->  bootstrap_options: developer_dir: /Applications/Xcode.app/Contents/Developer
--->  bootstrap_options: frameworks_dir: /opt/local/Library/Frameworks
--->  bootstrap_options: keeplogs: no
--->  bootstrap_options: macosx_deployment_target: 10.9
--->  bootstrap_options: macosx_sdk_version: 10.9
--->  bootstrap_options: macportsuser: macports
--->  bootstrap_options: place_worksymlink: yes
--->  bootstrap_options: portarchivetype: tbz2
--->  bootstrap_options: portautoclean: yes
--->  bootstrap_options: portdbpath: /opt/local/var/macports
--->  bootstrap_options: porttrace: no
--->  bootstrap_options: portverbose: no
--->  bootstrap_options: prefix: /opt/local
--->  bootstrap_options: revupgrade_autorun: no
--->  bootstrap_options: revupgrade_mode: rebuild
--->  bootstrap_options: rsync_dir: release/tarballs/base.tar
--->  bootstrap_options: rsync_options: -rtzv --delete-after
--->  bootstrap_options: rsync_server: rsync.macports.org
--->  bootstrap_options: sandbox_enable: yes
--->  bootstrap_options: sources_conf: /opt/local/etc/macports/sources.conf
--->  bootstrap_options: startupitem_install: yes
--->  bootstrap_options: startupitem_type: default
--->  bootstrap_options: universal_archs: x86_64 i386
--->  bootstrap_options: variants_conf: /opt/local/etc/macports/variants.conf
--->  bootstrap_options: xcodebuildcmd: /usr/bin/xcodebuild
--->  bootstrap_options: xcodeversion: 6.2
--->  port_tree_sources: file:///opt/local/var/macports/sources/svn.macports.org/trunk/dports default
--->  port_tree_sources: file:///Users/brad/misc/macports/users/gaurav/pypi2port/dports nosync
--->  global_variations: +gcc48 +universal -x11 +no_x11 +quartz


Regards,
Bradley Giesbrecht (pixilla)

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