diff -r 31d5c6236f71 -r f597eb3b5aaf src/mercurialserver/servelog.py
--- a/src/mercurialserver/servelog.py	Sun Dec 19 09:49:18 2010 +0000
+++ b/src/mercurialserver/servelog.py	Tue Sep 06 11:16:58 2011 +0100
@@ -9,7 +9,13 @@
 import os
 import time
 import fcntl
-import json
+
+try:
+    import json
+    json.dumps
+except ImportError:
+    import simplejson as json
+
 from mercurialserver import ruleset, changes
 
 def hook(ui, repo, hooktype, node=None, source=None, **kwargs):
@@ -25,13 +31,13 @@
         fcntl.flock(log.fileno(), fcntl.LOCK_EX)
         log.seek(0, os.SEEK_END)
         # YAML log file format
-        log.write("- {0}\n".format(json.dumps(dict(
+        log.write("- %s\n" % json.dumps(dict(
             timestamp=time.strftime("%Y-%m-%d_%H:%M:%S Z", time.gmtime()),
             op=op,
             key=ruleset.rules.get('user'),
             ssh_connection=os.environ['SSH_CONNECTION'],
             nodes=[mercurial.node.hex(ctx.node())
                 for ctx in changes.changes(repo, node)],
-         ))))
+         )))
     finally:
         log.close()