hooks: restore io correctly on exception

mercurial/hook.py

@@ -96,6 +96,7 def hook(ui, repo, name, throw=False, **
         oldstdout = os.dup(sys.__stdout__.fileno())
         os.dup2(sys.__stderr__.fileno(), sys.__stdout__.fileno())
 
+    try:
     for hname, cmd in util.sort(ui.configitems('hooks')):
         if hname.split('.')[0] != name or not cmd:
             continue
@@ -106,7 +107,7 def hook(ui, repo, name, throw=False, **
                             args, throw) or r
         else:
             r = _exthook(ui, repo, hname, cmd, args, throw) or r
-
+    finally:
     if _redirect:
         os.dup2(oldstdout, sys.__stdout__.fileno())
         os.close(oldstdout)