C:\scratch\fossil\tree>fossil branch new private_branch trunk --private
New branch: eb017cd99578e07ee0ff221fbc57ace0a240c3a8
Autosync:  http://www.fossil-scm.org/
                Bytes      Cards  Artifacts     Deltas
Sent:            2702         56          0          0
Server says: pull only - not authorized to push
Received:        2473         54          0          0
Total network traffic: 1601 bytes sent, 1523 bytes received

Notice the output line: "Server says: pull only - not authorized to push".

Why does creating a private branch cause a push?

dmitry added on 2011-08-23 01:52:02 UTC:
Something like this might work?

--- src/branch.c
+++ src/branch.c
@@ -173,12 +173,14 @@
 
 
   /* Commit */
   db_end_transaction(0);
   
-  /* Do an autosync push, if requested */
-  autosync(AUTOSYNC_PUSH);
+  if( !isPrivate ) {
+    /* Do an autosync push, if requested */
+    autosync(AUTOSYNC_PUSH);
+  }
 }