work around python bug on solaris 10. write to file opened mode 'a+' should write to end of file and update offset pointer, but does not (solaris 10 has python 2.3.3). fix is to always seek.

#!/bin/sh

hg init a
echo a > a/a
hg --cwd a ci -A -m a
hg clone a b
echo b > b/b
hg --cwd b ci -A -m b
chmod 100 a/.hg
hg --cwd b push ../a
chmod 700 a/.hg