diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -3260,11 +3260,8 @@ def find(cmd):
 
     raise UnknownCommand(cmd)
 
-class SignalInterrupt(Exception):
-    """Exception raised on SIGTERM and SIGHUP."""
-
 def catchterm(*args):
-    raise SignalInterrupt
+    raise util.SignalInterrupt
 
 def run():
     sys.exit(dispatch(sys.argv[1:]))
@@ -3464,7 +3461,7 @@ def dispatch(args):
                (inst.desc or inst.filename, inst.strerror))
     except revlog.RevlogError, inst:
         u.warn(_("abort: "), inst, "!\n")
-    except SignalInterrupt:
+    except util.SignalInterrupt:
         u.warn(_("killed!\n"))
     except KeyboardInterrupt:
         try:
diff --git a/mercurial/util.py b/mercurial/util.py
--- a/mercurial/util.py
+++ b/mercurial/util.py
@@ -16,6 +16,9 @@ from demandload import *
 demandload(globals(), "cStringIO errno popen2 re shutil sys tempfile")
 demandload(globals(), "threading time")
 
+class SignalInterrupt(Exception):
+    """Exception raised on SIGTERM and SIGHUP."""
+
 def pipefilter(s, cmd):
     '''filter string S through command CMD, returning its output'''
     (pout, pin) = popen2.popen2(cmd, -1, 'b')