# HG changeset patch
# User Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
# Date 1321428876 -3600
# Node ID 8b011ededfb2abe73f99996bd4ef4bc0b74dd78b
# Parent  6cae68a361ed49c086659fce9f87eec135805958
hook: flush stdout before redirecting to stderr

When hook output redirection is enabled (e.g. when cloning over ssh), hook
output on stdout is redirected to stderr, to prevent the repository data on
stdout from being corrupted.
In certain cases, the redirection could cause part of the repository data to
end up on stderr as well. In case of a clone, this causes:
"abort: consistency error in delta!"

This was seen with a clone over ssh, an outgoing hook present (any
non-python type, e.g. 'pwd'), on certain repositories only,
probably depending on the distribution of the sent data)

This patch updates the hook redirection code to flush stdout before
redirecting, removing the problem.

diff -r 6cae68a361ed -r 8b011ededfb2 mercurial/hook.py
--- a/mercurial/hook.py	Wed Nov 16 12:53:10 2011 +0100
+++ b/mercurial/hook.py	Wed Nov 16 08:34:36 2011 +0100
@@ -139,6 +139,7 @@
             stderrno = sys.__stderr__.fileno()
             # temporarily redirect stdout to stderr, if possible
             if stdoutno >= 0 and stderrno >= 0:
+                sys.__stdout__.flush()
                 oldstdout = os.dup(stdoutno)
                 os.dup2(stderrno, stdoutno)
         except AttributeError: