Make a hacked PTH file instead of installing in place.

Author: dhermes

datastore/make_pth.py

@@ -0,0 +1,72 @@
+import argparse
+import json
+import os
+
+from setuptools import namespaces
+
+
+FILENAME = 'danny-hack-nspkg.pth'
+VERSION = '0.20.0'
+CORE_DIST_INFO = 'google_cloud_core-{}.dist-info'.format(VERSION)
+CORE_METADATA = {
+    'metadata_version': '2.0',
+    'name': 'google-cloud-core',
+    'version': VERSION,
+}
+CURR_DIR = os.path.abspath(os.path.dirname(__file__))
+CORE_DIR = os.path.abspath(
+    os.path.join(CURR_DIR, '..', 'core'))
+EXTRA_PATH_TEMPLATE = (
+    'import sys;'
+    'mp = sys.modules[{!r}].__path__;'
+    'p1 = {!r};'
+    '(p1 not in mp) and mp.append(p1);'
+    'p2 = {!r};'
+    '(p2 not in mp) and mp.append(p2)\n')
+
+
+def fake_core_dist_info(site_packages):
+    """Fake the dist. info of google-cloud-core.
+
+    It needs to be faked since we don't actually install it.
+    """
+    dist_info = os.path.join(site_packages, CORE_DIST_INFO)
+    if not os.path.isdir(dist_info):
+        os.mkdir(dist_info)
+    meta = os.path.join(dist_info, 'metadata.json')
+    if not os.path.exists(meta):
+        with open(meta, 'w') as file_obj:
+            json.dump(CORE_METADATA, file_obj)
+
+
+def add_hacked_pth_file(site_packages):
+    """Add the hacked .PTH file to the site packages dir."""
+    installer = namespaces.Installer()
+    part1 = installer._gen_nspkg_line('google')
+    part2 = EXTRA_PATH_TEMPLATE.format(
+        'google', os.path.join(CORE_DIR, 'google'),
+        os.path.join(CURR_DIR, 'google'))
+    part3 = installer._gen_nspkg_line('google.cloud')
+    part4 = EXTRA_PATH_TEMPLATE.format(
+        'google.cloud', os.path.join(CORE_DIR, 'google', 'cloud'),
+        os.path.join(CURR_DIR, 'google', 'cloud'))
+
+    file_contents = ''.join([part1, part2, part3, part4])
+    full_path = os.path.join(site_packages, FILENAME)
+    with open(full_path, 'w') as file_obj:
+        file_obj.write(file_contents)
+
+
+def main(site_packages):
+    add_hacked_pth_file(site_packages)
+    fake_core_dist_info(site_packages)
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(
+        description='Make a hacked PTH file to emulate "setup.py develop"')
+    help_txt = 'Site packages directory where .pth file will be added.'
+    parser.add_argument('--site-packages', dest='site_packages',
+                        required=True, help=help_txt)
+    args = parser.parse_args()
+    main(args.site_packages)

datastore/tox.ini

@@ -1,12 +1,19 @@
 [tox]
+skipsdist=True
 envlist =
     py27,py34,py35,cover
 
 [testing]
-localdeps =
-    pip install --upgrade {toxinidir}/../core
 deps =
     pytest
+    httplib2 >= 0.9.1
+    googleapis-common-protos >= 1.3.4
+    oauth2client >= 3.0.0, < 4.0.0dev
+    protobuf >= 3.0.0
+    six
+    grpcio >= 1.0.0, < 2.0dev
+installcmd =
+    python {toxinidir}/make_pth.py --site-packages {envsitepackagesdir}
 covercmd =
     py.test --quiet \
       --cov=google.cloud.datastore \
@@ -16,7 +23,7 @@ covercmd =
 
 [testenv]
 commands =
-    {[testing]localdeps}
+    {[testing]installcmd}
     py.test --quiet {posargs} unit_tests
 deps =
     {[testing]deps}
@@ -25,7 +32,7 @@ deps =
 basepython =
     python2.7
 commands =
-    {[testing]localdeps}
+    {[testing]installcmd}
     {[testing]covercmd}
 deps =
     {[testenv]deps}