# HG changeset patch
# User Alexis S. L. Carvalho <alexis@cecm.usp.br>
# Date 2008-02-03 23:03:46
# Node ID 850494d626741ccdb8361f77c05bb08e7a7f9d96
# Parent  9451a941c536378c4578abcb9df5cda1737d4937

localrepo._tag: add a seek before writing the new tag

Some systems require a seek (or flush) between read and write
operations on the same file object.

This should fix issue838.

diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -118,6 +118,7 @@ class localrepository(repo.repository):
         self.hook('pretag', throw=True, node=hex(node), tag=name, local=local)
 
         def writetag(fp, name, munge, prevtags):
+            fp.seek(0, 2)
             if prevtags and prevtags[-1] != '\n':
                 fp.write('\n')
             fp.write('%s %s\n' % (hex(node), munge and munge(name) or name))