hook.py: fix redirections introduced by 323b9c55b328

The only non-obvious part is the use of sys.{__stderr__,__stdout__},
which is needed because sshserver overrides sys.stdout.

This makes a test that I added back in revision 7939c71f3132 ineffective.

mercurial/hook.py

@@ -85,6 +85,7 b' def _exthook(ui, repo, name, cmd, args, '
 
 _redirect = False
 def redirect(state):
+    global _redirect
     _redirect = state
 
 def hook(ui, repo, name, throw=False, **args):
@@ -92,8 +93,8 b' def hook(ui, repo, name, throw=False, **'
 
     if _redirect:
         # temporarily redirect stdout to stderr
-        oldstdout = os.dup(sys.stdout.fileno())
-        os.dup2(sys.stderr.fileno(), sys.stdout.fileno())
+        oldstdout = os.dup(sys.__stdout__.fileno())
+        os.dup2(sys.__stderr__.fileno(), sys.__stdout__.fileno())
 
     hooks = [(hname, cmd) for hname, cmd in ui.configitems("hooks")
              if hname.split(".", 1)[0] == name and cmd]
@@ -106,8 +107,9 b' def hook(ui, repo, name, throw=False, **'
                             args, throw) or r
         else:
             r = _exthook(ui, repo, hname, cmd, args, throw) or r
-    return r
 
     if _redirect:
-        os.dup2(oldstdout, sys.stdout.fileno())
+        os.dup2(oldstdout, sys.__stdout__.fileno())
         os.close(oldstdout)
+
+    return r

tests/test-ssh

@@ -29,7 +29,7 b' EOF'
 
 cat <<EOF > badhook
 import sys
-sys.stdout.write("KABOOM")
+sys.stdout.write("KABOOM\n")
 EOF
 
 echo "# creating 'remote'"

tests/test-ssh.out

@@ -78,8 +78,7 b' remote: adding changesets'
 remote: adding manifests
 remote: adding file changes
 remote: added 1 changesets with 1 changes to 1 files
-abort: unexpected response:
-'KABOOM1\n'
+remote: KABOOM
 changeset:   3:ac7448082955
 tag:         tip
 parent:      1:572896fe480d