Clean up activity environment variables

Ensure environment variables needed by Python activities are available
in each of the three supported scenarios;

- started from Sugar,

- started from Terminal inside Sugar,

- started by other desktop environments.

Variables always available are;

SUGAR_ACTIVITY_ROOT
SUGAR_BUNDLE_ID
SUGAR_BUNDLE_NAME
SUGAR_BUNDLE_PATH
SUGAR_BUNDLE_VERSION

Variables also available when started from Sugar are;

SUGAR_ACTIVITIES_HIDDEN
SUGAR_APISOCKET_KEY
SUGAR_APISOCKET_PORT
SUGAR_GROUP_LABELS
SUGAR_HOME
SUGAR_MIME_DEFAULTS
SUGAR_PROFILE
SUGAR_SCALING
SUGAR_VERSION

Variables also available when started from Terminal are;

SUGAR_TERMINAL_VERSION

Other changes;

- use os.makedirs in place of distutils.dir_util.mkpath,

- avoid redundant setting of SUGAR_BUNDLE_PATH,

- do not set SUGAR_BUNDLE_ID unnecessarily,

- add explanatory comment,

Tested on Ubuntu 18.04.

Signed-off-by: James Cameron <quozl@laptop.org>

src/sugar3/activity/activityinstance.py

@@ -40,12 +40,21 @@ from sugar3 import logger
 
 from sugar3.bundle.bundle import MalformedBundleException
 
-from distutils.dir_util import mkpath
+from errno import EEXIST
+
 import time
 import hashlib
 import random
 
 
+def _makedirs(path):
+    try:
+        os.makedirs(path)
+    except OSError as e:
+        if e.errno != EEXIST:
+            raise e
+
+
 def create_activity_instance(constructor, handle):
     activity = constructor(handle)
     activity.show()
@@ -113,9 +122,7 @@ def main():
         else:
             activity_class = args[0]
 
-    os.environ['SUGAR_BUNDLE_PATH'] = os.path.abspath(os.curdir)
+    bundle_path = os.path.abspath(os.curdir)
-
-    bundle_path = os.environ['SUGAR_BUNDLE_PATH']
     sys.path.insert(0, bundle_path)
 
     try:
@@ -131,25 +138,28 @@ def main():
                 logging.warning("Activity written for Python 2, consider porting to Python 3.")
             activity_class = command.split(" ")[1]
 
-    if 'SUGAR_VERSION' not in os.environ:
+    # when an activity is started outside sugar,
+    # activityfactory.get_environment has not executed in parent
+    # process, so parts of get_environment must happen here.
+    if 'SUGAR_BUNDLE_PATH' not in os.environ:
         profile_id = os.environ.get('SUGAR_PROFILE', 'default')
         home_dir = os.environ.get('SUGAR_HOME', os.path.expanduser('~/.sugar'))
         base = os.path.join(home_dir, profile_id)
         activity_root = os.path.join(base, bundle.get_bundle_id())
 
         instance_dir = os.path.join(activity_root, 'instance')
-        mkpath(instance_dir)
+        _makedirs(instance_dir)
 
         data_dir = os.path.join(activity_root, 'data')
-        mkpath(data_dir)
+        _makedirs(data_dir)
 
         tmp_dir = os.path.join(activity_root, 'tmp')
-        mkpath(tmp_dir)
+        _makedirs(tmp_dir)
-
-        os.environ['SUGAR_ACTIVITY_ROOT'] = activity_root
-        os.environ['SUGAR_BUNDLE_PATH'] = bundle.get_path()
 
+        os.environ['SUGAR_BUNDLE_PATH'] = bundle_path
         os.environ['SUGAR_BUNDLE_ID'] = bundle.get_bundle_id()
+        os.environ['SUGAR_ACTIVITY_ROOT'] = activity_root
+
     os.environ['SUGAR_BUNDLE_NAME'] = bundle.get_name()
     os.environ['SUGAR_BUNDLE_VERSION'] = str(bundle.get_activity_version())