add a root rbt wrapper. this is the same one we use in the aurora rep…

…ository.

Testing Done:
./rbt

Reviewed at https://rbcommons.com/s/twitter/r/38/

(sapling split of 2d62f5d8a4e949c892826866d1556836fc646e23)

.gitignore

@@ -24,6 +24,9 @@
 .pydevproject
 bin/
 build/
+build-support/*.pex
+build-support/*.venv
+build-support/virtualenv-*
 build-support/phab/
 codegen/classes/
 dist/

build-support/virtualenv

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+# Wrapper for self-bootstrapping virtualenv
+set -ex
+VIRTUALENV_VERSION=1.10.1
+
+if which python2.7 >/dev/null; then
+  PY=`which python2.7`
+elif which python2.6 >/dev/null; then
+  PY=`which python2.6`
+else
+  echo 'No python interpreter found on the path.  Python will not work!' 1>&2
+  exit 1
+fi
+
+echo "Using $PY" >&2
+
+HERE=$(cd `dirname "${BASH_SOURCE[0]}"` && pwd)
+if ! [ -f "$HERE/virtualenv-$VIRTUALENV_VERSION/BOOTSTRAPPED" ]; then
+  pushd "$HERE"
+  curl -O https://pypi.python.org/packages/source/v/virtualenv/virtualenv-$VIRTUALENV_VERSION.tar.gz
+  tar zxvf virtualenv-$VIRTUALENV_VERSION.tar.gz
+  # TODO(ksweeney): Checksum
+  touch virtualenv-$VIRTUALENV_VERSION/BOOTSTRAPPED  # 2PC
+  popd
+fi
+
+exec "$PY" "$HERE/virtualenv-$VIRTUALENV_VERSION/virtualenv.py" "$@"

rbt

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+#
+# Copyright 2013 Apache Software Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# Wrapper script for self-bootstrapping rbt.
+set -e
+
+HERE=$(cd `dirname "${BASH_SOURCE[0]}"` && pwd)
+RBTOOLS_VERSION=0.5.5
+if ! [ -f "$HERE/build-support/rbt.venv/BOOTSTRAPPED" ] || \
+    [ x`cat "$HERE/build-support/rbt.venv/BOOTSTRAPPED"` != x$RBTOOLS_VERSION ]; then
+
+  echo Bootstrapping rbtools @ $RBTOOLS_VERSION
+  rm -fr "$HERE/build-support/rbt.venv"
+  "$HERE/build-support/virtualenv" "$HERE/build-support/rbt.venv"
+  source "$HERE/build-support/rbt.venv/bin/activate"
+  pip install "RBTools==$RBTOOLS_VERSION"
+  echo $RBTOOLS_VERSION > "$HERE/build-support/rbt.venv/BOOTSTRAPPED"
+fi
+source "$HERE/build-support/rbt.venv/bin/activate"
+# TODO(kevints): Use ./pants py here instead of virtualenv.
+exec rbt "$@"