Python3 Compatiable

[ralic]

Built and tested on Ubuntu

[dsoprea]

Thank you for your contribution.

I ran into issues. You didn't specify a specific version, so I tried with 3.4 .

I needed the following to even get off the ground:

diff --git a/gdrivefs/oauth_authorize.py b/gdrivefs/oauth_authorize.py
index 09efac5..243d85e 100644
--- a/gdrivefs/oauth_authorize.py
+++ b/gdrivefs/oauth_authorize.py
@@ -37,7 +37,7 @@ class OauthAuthorize(object):
 
         api_credentials = gdrivefs.conf.Conf.get('api_credentials')
 
-        with tempfile.NamedTemporaryFile() as f:
+        with tempfile.NamedTemporaryFile(mode='r+') as f:
             json.dump(api_credentials, f)
             f.flush()
 
@@ -89,7 +89,7 @@ class OauthAuthorize(object):
             _LOGGER.debug("Checking for cached credentials: %s",
                           self.__creds_filepath)
 
-            with open(self.__creds_filepath) as cache:
+            with open(self.__creds_filepath, 'rb') as cache:
                 credentials_serialized = cache.read()
 
             # If we're here, we have serialized credentials information.
@@ -139,7 +139,7 @@ class OauthAuthorize(object):
 
         # Write cache file.
 
-        with open(self.__creds_filepath, 'w') as cache:
+        with open(self.__creds_filepath, 'wb') as cache:
             cache.write(credentials_serialized)
 
     def step2_doexchange(self, auth_code):
diff --git a/gdrivefs/resources/scripts/gdfstool b/gdrivefs/resources/scripts/gdfstool
index 9722bbc..b1255ed 100755
--- a/gdrivefs/resources/scripts/gdfstool
+++ b/gdrivefs/resources/scripts/gdfstool
@@ -163,6 +163,10 @@ def main():
 
     args = p.parse_args()
 
+    if args.command is None:
+        p.print_help()
+        sys.exit(1)
+
     gdrivefs.config.log.configure(is_debug=args.verbose)
 
     if args.command == 'auth_get_url':

I added a check for a subcommand because, apparently, a subcommand is no longer implicitly required in Python 3.4.

After the changes above were introduced, I got the following issues:

$ gdfs -v default /tmp/gdfs/
2017-12-12 00:49:57,755 [__main__ DEBUG] Mounting GD with creds at [default]: /tmp/gdfs/
2017-12-12 00:49:57,755 [gdrivefs.gdfuse DEBUG] PERMS: F=777 E=666 NE=444
2017-12-12 00:49:57,757 [gdrivefs.drive DEBUG] Getting authorized HTTP tunnel.
2017-12-12 00:49:57,757 [gdrivefs.drive DEBUG] Got authorized tunnel.
2017-12-12 00:49:57,758 [googleapiclient.discovery_cache WARNING] file_cache is unavailable when using oauth2client >= 4.0.0
Traceback (most recent call last):
  File "/home/local/MAGICLEAP/doprea/.virtualenvs/gdrivefs.188/lib/python3.4/site-packages/googleapiclient/discovery_cache/__init__.py", line 36, in autodetect
    from google.appengine.api import memcache
ImportError: No module named 'google'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/local/MAGICLEAP/doprea/.virtualenvs/gdrivefs.188/lib/python3.4/site-packages/googleapiclient/discovery_cache/file_cache.py", line 33, in <module>
    from oauth2client.contrib.locked_file import LockedFile
ImportError: No module named 'oauth2client.contrib.locked_file'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/local/MAGICLEAP/doprea/.virtualenvs/gdrivefs.188/lib/python3.4/site-packages/googleapiclient/discovery_cache/file_cache.py", line 37, in <module>
    from oauth2client.locked_file import LockedFile
ImportError: No module named 'oauth2client.locked_file'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/local/MAGICLEAP/doprea/.virtualenvs/gdrivefs.188/lib/python3.4/site-packages/googleapiclient/discovery_cache/__init__.py", line 41, in autodetect
    from . import file_cache
  File "/home/local/MAGICLEAP/doprea/.virtualenvs/gdrivefs.188/lib/python3.4/site-packages/googleapiclient/discovery_cache/file_cache.py", line 41, in <module>
    'file_cache is unavailable when using oauth2client >= 4.0.0')
ImportError: file_cache is unavailable when using oauth2client >= 4.0.0
2017-12-12 00:49:57,758 [googleapiclient.discovery INFO] URL being requested: GET https://www.googleapis.com/discovery/v1/apis/drive/v2/rest
2017-12-12 00:49:57,959 [googleapiclient.discovery INFO] URL being requested: GET https://www.googleapis.com/drive/v2/about?alt=json
fuse: bad mount point `/tmp/gdfs/': Input/output error
Traceback (most recent call last):
  File "/home/local/MAGICLEAP/doprea/.virtualenvs/gdrivefs.188/bin/gdfs", line 6, in <module>
    exec(compile(open(__file__).read(), __file__, 'exec'))
  File "/home/local/MAGICLEAP/doprea/development/python/gdrivefs.188/gdrivefs/resources/scripts/gdfs", line 62, in <module>
    _main()
  File "/home/local/MAGICLEAP/doprea/development/python/gdrivefs.188/gdrivefs/resources/scripts/gdfs", line 59, in _main
    option_string=option_string)
  File "/home/local/MAGICLEAP/doprea/development/python/gdrivefs.188/gdrivefs/gdfuse.py", line 872, in mount
    **fuse_opts)
  File "/home/local/MAGICLEAP/doprea/.virtualenvs/gdrivefs.188/lib/python3.4/site-packages/fuse.py", line 480, in __init__
    raise RuntimeError(err)
RuntimeError: 1

[dsoprea]

I got this project into compatibility with 3.6 as of last night.