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+infra_virtualenv README
+=======================
+
+This repository provides a common Python virtualenv interface that
+infra code (such as chromite) can depend on. At this point, it is
+experimental and not yet used in production.
+
+Virtualenv users should create a `requirements.txt` file listing the
+packages that they need and use the wrapper scripts (described below)
+to create the virtualenv and run commands within it.
+
+To add packages to this repository, run:
+
+ $ pip wheel -w path/to/pip_packages -r path/to/requirements.txt
+
+Commit the changes and make a CL.
+
+For example for chromite, from within `chromite/virtualenv`, run:
+
+ $ pip wheel -w pip_packages -r requirements.txt
+
+Wrapper scripts
+---------------
+
+This repository contains two scripts for working with Python virtualenvs.
+
+`venv_command` runs a command in a virtualenv environment. This is more
+convenient than having to start a shell and source `bin/activate`.
+For example, to start Python inside the virtualenv:
+
+ $ venv_command path/to/venv python
+
+`create_venv` creates or updates a virtualenv using a `requirements.txt` file.
+
+ $ create_venv path/to/venv path/to/requirements.txt
+
+Here’s a complete example:
+
+ $ echo mock=2.0.0 > requirements.txt
+ $ ./create_venv venv requirements.txt
+ $ ./venv_command venv python
+ Python 2.7.6 (default, Jun 22 2015, 17:58:13)
+ [GCC 4.8.2] on linux2
+ Type "help", "copyright", "credits" or "license" for more information.
+ >>> import mock
+ >>>
diff --git a/create_venv b/create_venv
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+#!/bin/bash
+# Copyright 2016 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+#
+# Create or update a virtualenv.
+#
+# $ create_venv path/to/venv path/to/requirements.txt
+set -eu
+
+basedir=$(readlink -f "$(dirname "${BASH_SOURCE[0]}" )")
+pkgdir="$basedir/pip_packages"
+
+main() {
+ if [[ $# -ne 2 ]]; then
+ print_help >&2
+ exit 1
+ fi
+
+ local venv_dir=$1
+ local requirements=$2
+ local lock="$venv_dir/.create_venv.lock"
+
+ mkdir -p "$venv_dir"
+ (
+ # Try to acquire a lock for 90 seconds.
+ if ! flock -w 90 9; then
+ echo 'Failed to acquire lock on virtualenv' >&2
+ exit 1
+ fi
+ if up_to_date "$venv_dir" "$requirements"; then
+ echo "Existing virtualenv $venv_dir is already up to date"
+ else
+ echo "Creating or updating virtualenv in $venv_dir"
+ init_venv "$venv_dir"
+ install_packages_in_venv "$venv_dir" "$requirements"
+ mark_up_to_date "$venv_dir" "$requirements"
+ fi
+ ) 9>"$lock"
+}
+
+print_help() {
+ echo "Usage: $0 path/to/venv path/to/requirements.txt
+
+Create or update a Python virtualenv."
+}
+
+up_to_date() {
+ local venv_dir=$1
+ local requirements=$2
+ local installed="$venv_dir/.installed.txt"
+ cmp -s "$requirements" "$installed"
+}
+
+mark_up_to_date() {
+ local venv_dir=$1
+ local requirements=$2
+ local installed="$venv_dir/.installed.txt"
+ cp "$requirements" "$installed"
+}
+
+init_venv() {
+ local venv_dir=$1
+ virtualenv "$venv_dir" --extra-search-dir="$pkgdir"
+}
+
+install_packages_in_venv() {
+ local venv_dir=$1
+ local requirements=$2
+ venv_command "$venv_dir" \
+ pip install --no-index -f "$pkgdir" -r "$requirements"
+}
+
+venv_command() {
+ "$basedir/venv_command" "$@"
+}
+
+main "$@"
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+#!/bin/bash
+# Copyright 2016 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+#
+# Run a command in a virtualenv environment.
+#
+# $ venv_command path/to/venv command [args...]
+set -eu
+
+main() {
+ if [[ $# -lt 2 ]]; then
+ print_help >&2
+ exit 1
+ fi
+
+ local venv_dir=$1
+ shift 1
+
+ activate_venv "$venv_dir"
+ exec "$@"
+}
+
+print_help() {
+ echo "Usage: $0 path/to/venv command [args...]
+
+Run a command in a Python virtualenv environment."
+}
+
+activate_venv() {
+ local venv_dir=$1
+ set +u # activate script relies on unset variables.
+ # shellcheck source=/dev/null
+ . "$venv_dir/bin/activate"
+ set -u
+}
+
+main "$@"
