git-p4: add option to system() to return subshell status

diff --git a/git-p4.py b/git-p4.py
index 0093fa3d8391b4b56c5613b063996cc6dc5c7b60..9d55f9c1e9e33c8c0652ab1ddea2f8bbeb136c8d 100755 (executable)
--- a/git-p4.py
+++ b/git-p4.py
@@ -192,14 +192,16 @@ def p4_has_move_command():
     # assume it failed because @... was invalid changelist
     return True
 
-def system(cmd):
+def system(cmd, ignore_error=False):
     expand = isinstance(cmd,basestring)
     if verbose:
         sys.stderr.write("executing %s\n" % str(cmd))
     retcode = subprocess.call(cmd, shell=expand)
-    if retcode:
+    if retcode and not ignore_error:
         raise CalledProcessError(retcode, cmd)
 
+    return retcode
+
 def p4_system(cmd):
     """Specifically invoke p4 as the system command. """
     real_cmd = p4_build_cmd(cmd)