Update CI tools with an openstack wrapper

Change-Id: I786884c540962fd908b0d323938aa9733ead65ce

tools/ci/lib

@@ -0,0 +1,3 @@
+CI_TOOLS_DIR=$(dirname "${BASH_SOURCE[0]}")
+CI_TOOLS_DIR=$("${CI_TOOLS_DIR}/realpath" "${CI_TOOLS_DIR}")
+PATH=${CI_TOOLS_DIR}:${PATH}

tools/ci/os

@@ -0,0 +1,50 @@
+#!/bin/bash
+
+set -eu
+
+source $(dirname "$0")/lib
+
+OS_VIRTUAL_ENV=$(realpath "${OS_VIRTUAL_ENV:-.tox/scenario}")
+
+
+function os {
+    os_setup
+
+    openstack "$@"
+}
+
+
+function os_setup {
+    if ! os_activate; then
+        # Cleanup and create virtualenv directory
+        tox -r -e venv --notest
+
+        os_activate
+    fi
+}
+
+
+function os_activate {
+    local venv_script=${OS_VIRTUAL_ENV}/bin/activate
+    if ! [ -r "${venv_script}" ]; then
+        return 1
+    fi
+
+    if ! os_is_active; then
+        # Activate only once
+        set +eu
+        source "${venv_script}"
+        set -eu
+        os_is_active
+    fi
+}
+
+
+function os_is_active {
+    [ "$(python_prefix)" == "${OS_VIRTUAL_ENV}" ]
+}
+
+
+if [ $(basename "$0") == os ]; then
+    os "$@"
+fi

tools/ci/python_prefix

@@ -0,0 +1,6 @@
+#!/usr/bin/env python
+
+import os
+import sys
+
+print(os.path.realpath(sys.prefix))

tools/ci/realpath

@@ -0,0 +1,8 @@
+#!/usr/bin/env python
+
+import os
+import sys
+
+args = sys.argv[1:] or ['.']
+results = [os.path.realpath(a) for a in args]
+print(' '.join(results))

tools/ci/tox

@@ -1,23 +1,81 @@
 #!/bin/bash
 
-set -eux
+set -eu
 
-# Prefer python3 on python2
-PYTHON=$(which python3 || which python)
+source $(dirname "$0")/lib
 
-# Create a virtualenv for executing Tox and activate it
-BASE_VIRTUALENV_DIR=.tox/base
-if ! [ -d "${BASE_VIRTUALENV_DIR}" ]; then
-    "${PYTHON}" -m virtualenv "${BASE_VIRTUALENV_DIR}"
-    set +eux
-    source "${BASE_VIRTUALENV_DIR}/bin/activate"
-    set -eux
-    curl https://bootstrap.pypa.io/get-pip.py | python
-    pip install --upgrade setuptools wheel virtualenv tox
-else
-    set +eux
-    source "${BASE_VIRTUALENV_DIR}/bin/activate"
-    set -eux
+
+# Prefer python 3 over python 2
+TOX_BASE_PYTHON=${PYTHON:-$(which python3 || which python)}
+TOX_VIRTUAL_ENV=$(realpath "${TOX_VIRTUAL_ENV:-.tox/tox}")
+
+
+function tox {
+    tox_setup
+    "${TOX_VIRTUAL_ENV}/bin/tox" "$@"
+}
+
+
+function tox_python {
+    "${TOX_VIRTUAL_ENV}/bin/python" "$@"
+}
+
+
+function tox_pip {
+    "${TOX_VIRTUAL_ENV}/bin/pip" "$@"
+}
+
+
+function tox_setup {
+    if ! tox_activate; then
+        tox_install_deps
+
+        # Cleanup and create virtualenv directory
+        rm -fR "${TOX_VIRTUAL_ENV}"
+        mkdir -p $(dirname "${TOX_VIRTUAL_ENV}")
+        "${TOX_BASE_PYTHON}" -m virtualenv "${TOX_VIRTUAL_ENV}"
+
+        # Activate virtualenv
+        if tox_activate; then
+            # Install/upgrade the last Python packages into the new virutalenv
+            curl https://bootstrap.pypa.io/get-pip.py | tox_python
+            tox_pip install --upgrade setuptools wheel virtualenv tox
+        fi
+    fi
+}
+
+
+function tox_install_deps {
+    if ! "${TOX_BASE_PYTHON}" -m pip --version; then
+        curl https://bootstrap.pypa.io/get-pip.py --user | "${TOX_BASE_PYTHON}"
+    fi
+    if ! "${TOX_BASE_PYTHON}" -m virtualenv --version; then
+        "${TOX_BASE_PYTHON}" -m pip install --user virtualenv
+    fi
+}
+
+
+function tox_activate {
+    local venv_script=${TOX_VIRTUAL_ENV}/bin/activate
+    if ! [ -r "${venv_script}" ]; then
+        return 1
+    fi
+
+    if ! tox_is_active; then
+        # Activate only once
+        set +eu
+        source "${venv_script}"
+        set -eu
+        tox_is_active
+    fi
+}
+
+
+function tox_is_active {
+    [ "$(python_prefix)" == "${TOX_VIRTUAL_ENV}" ]
+}
+
+
+if [ $(basename "$0") == tox ]; then
+    tox "$@"
 fi
-
-tox "$*"