make it work on Windows

this was upsettingly easy.  however, it requires a trivial patch to
reFUSE to be merged and released:
pleiszenburg/refuse#29

README.md

@@ -66,6 +66,12 @@ cookies = ['d=wpwQ4182w08qxmE4YP0gvlMb2L...']
 
 That's all you need.  All Slacks you logged into will be autodetected.
 
+On Windows, your mountpoint should be a drive letter:
+```toml
+[emojifs]
+mountpoint = 'E:'
+```
+
 ### A comprehensive configuration
 There are a few niceties available:
 ```toml

emojifs/__main__.py

@@ -77,7 +77,8 @@ def main():
                    'overrides mountpoint from config.')
     p.add_argument('-f', '--foreground', help='If set, stay in the foreground.', default=False)
     p.add_argument('-c', '--config', help='Path to your config file with secrets',
-                   default=os.path.expanduser("~/.emojifs.toml"), type=argparse.FileType('r'))
+                   default=os.path.join(os.path.expanduser("~"), ".emojifs.toml"),
+                   type=argparse.FileType('r'))
     p.add_argument('-v', '--verbose', action='count', default=0,
                    help='Verbosity (-v, -vv, etc).  Higher verbosities will log all HTTP traffic '
                         '(NB: at higher levels, this will log your auth secrets!)')

emojifs/muxer.py

@@ -26,6 +26,8 @@
 import refuse.high as fuse
 from logzero import logger
 
+import emojifs.utils as utils
+
 
 class Muxer(fuse.LoggingMixIn, fuse.Operations):
     def __init__(self, map):
@@ -80,8 +82,8 @@ def getattr(self, path, *args, **kwargs):
             return dict(
                 st_mode=stat.S_IFDIR | 0o555,
                 st_nlink=2,
-                st_uid=os.getuid(),
-                st_gid=os.getgid(),
+                st_uid=utils.getuid(),
+                st_gid=utils.getgid(),
             )
         # Delegate to mountpoints their / and below.
         try:

emojifs/slack.py

@@ -223,8 +223,8 @@ def getattr(self, path, fh):
                 st_ctime=min([e['created'] for e in emojis.values()]),
                 st_atime=time.time(),
                 st_nlink=2,
-                st_uid=os.getuid(),
-                st_gid=os.getgid(),
+                st_uid=emojifs.utils.getuid(),
+                st_gid=emojifs.utils.getgid(),
             )
 
         if path in self._write_buffers:
@@ -234,8 +234,8 @@ def getattr(self, path, fh):
                 st_ctime=time.time(),
                 st_mtime=time.time(),
                 st_nlink=1,
-                st_uid=os.getuid(),
-                st_gid=os.getgid(),
+                st_uid=emojifs.utils.getuid(),
+                st_gid=emojifs.utils.getgid(),
                 st_size=len(self._write_buffers[path].getbuffer())
             )
 
@@ -251,8 +251,8 @@ def getattr(self, path, fh):
             st_ctime=e['created'],
             st_atime=time.time(),
             st_nlink=1,
-            st_uid=os.getuid(),
-            st_gid=os.getgid(),
+            st_uid=emojifs.utils.getuid(),
+            st_gid=emojifs.utils.getgid(),
             st_size=(self._get_content_length(e['url']) if self._real_sizes else 256*1024),
         )
 

emojifs/utils.py

@@ -2,7 +2,16 @@
 
 from emojifs import __version__, __repository__
 
+import os
 
 def set_user_agent(x):
     """Sets a reasonable User-Agent. x should be a Request headers-like object."""
     x['User-Agent'] = f"emojifs/{__version__} ({__repository__}) {x['User-Agent']}"
+
+def getuid():
+    """Windows doesn't have os.getuid; WinFsp is happy with -1 though."""
+    return os.getuid() if hasattr(os, 'getuid') else -1
+
+def getgid():
+    """Windows doesn't have os.getgid; WinFsp is happy with -1 though."""
+    return os.getgid() if hasattr(os, 'getgid') else -1