--- a/hgext/fsmonitor/state.py	Sun Oct 06 09:45:02 2019 -0400
+++ b/hgext/fsmonitor/state.py	Sun Oct 06 09:48:39 2019 -0400
@@ -19,7 +19,7 @@
 )
 
 _version = 4
-_versionformat = ">I"
+_versionformat = b">I"
 
 
 class state(object):
@@ -30,15 +30,15 @@
         self._lastclock = None
         self._identity = util.filestat(None)
 
-        self.mode = self._ui.config('fsmonitor', 'mode')
+        self.mode = self._ui.config(b'fsmonitor', b'mode')
         self.walk_on_invalidate = self._ui.configbool(
-            'fsmonitor', 'walk_on_invalidate'
+            b'fsmonitor', b'walk_on_invalidate'
         )
-        self.timeout = float(self._ui.config('fsmonitor', 'timeout'))
+        self.timeout = float(self._ui.config(b'fsmonitor', b'timeout'))
 
     def get(self):
         try:
-            file = self._vfs('fsmonitor.state', 'rb')
+            file = self._vfs(b'fsmonitor.state', b'rb')
         except IOError as inst:
             self._identity = util.filestat(None)
             if inst.errno != errno.ENOENT:
@@ -50,9 +50,9 @@
         versionbytes = file.read(4)
         if len(versionbytes) < 4:
             self._ui.log(
-                'fsmonitor',
-                'fsmonitor: state file only has %d bytes, '
-                'nuking state\n' % len(versionbytes),
+                b'fsmonitor',
+                b'fsmonitor: state file only has %d bytes, '
+                b'nuking state\n' % len(versionbytes),
             )
             self.invalidate()
             return None, None, None
@@ -61,21 +61,21 @@
             if diskversion != _version:
                 # different version, nuke state and start over
                 self._ui.log(
-                    'fsmonitor',
-                    'fsmonitor: version switch from %d to '
-                    '%d, nuking state\n' % (diskversion, _version),
+                    b'fsmonitor',
+                    b'fsmonitor: version switch from %d to '
+                    b'%d, nuking state\n' % (diskversion, _version),
                 )
                 self.invalidate()
                 return None, None, None
 
-            state = file.read().split('\0')
+            state = file.read().split(b'\0')
             # state = hostname\0clock\0ignorehash\0 + list of files, each
             # followed by a \0
             if len(state) < 3:
                 self._ui.log(
-                    'fsmonitor',
-                    'fsmonitor: state file truncated (expected '
-                    '3 chunks, found %d), nuking state\n',
+                    b'fsmonitor',
+                    b'fsmonitor: state file truncated (expected '
+                    b'3 chunks, found %d), nuking state\n',
                     len(state),
                 )
                 self.invalidate()
@@ -85,9 +85,9 @@
             if diskhostname != hostname:
                 # file got moved to a different host
                 self._ui.log(
-                    'fsmonitor',
-                    'fsmonitor: stored hostname "%s" '
-                    'different from current "%s", nuking state\n'
+                    b'fsmonitor',
+                    b'fsmonitor: stored hostname "%s" '
+                    b'different from current "%s", nuking state\n'
                     % (diskhostname, hostname),
                 )
                 self.invalidate()
@@ -110,31 +110,33 @@
 
         # Read the identity from the file on disk rather than from the open file
         # pointer below, because the latter is actually a brand new file.
-        identity = util.filestat.frompath(self._vfs.join('fsmonitor.state'))
+        identity = util.filestat.frompath(self._vfs.join(b'fsmonitor.state'))
         if identity != self._identity:
-            self._ui.debug('skip updating fsmonitor.state: identity mismatch\n')
+            self._ui.debug(
+                b'skip updating fsmonitor.state: identity mismatch\n'
+            )
             return
 
         try:
             file = self._vfs(
-                'fsmonitor.state', 'wb', atomictemp=True, checkambig=True
+                b'fsmonitor.state', b'wb', atomictemp=True, checkambig=True
             )
         except (IOError, OSError):
-            self._ui.warn(_("warning: unable to write out fsmonitor state\n"))
+            self._ui.warn(_(b"warning: unable to write out fsmonitor state\n"))
             return
 
         with file:
             file.write(struct.pack(_versionformat, _version))
-            file.write(socket.gethostname() + '\0')
-            file.write(clock + '\0')
-            file.write(ignorehash + '\0')
+            file.write(socket.gethostname() + b'\0')
+            file.write(clock + b'\0')
+            file.write(ignorehash + b'\0')
             if notefiles:
-                file.write('\0'.join(notefiles))
-                file.write('\0')
+                file.write(b'\0'.join(notefiles))
+                file.write(b'\0')
 
     def invalidate(self):
         try:
-            os.unlink(os.path.join(self._rootdir, '.hg', 'fsmonitor.state'))
+            os.unlink(os.path.join(self._rootdir, b'.hg', b'fsmonitor.state'))
         except OSError as inst:
             if inst.errno != errno.ENOENT:
                 raise