grok-shell: handle no-argument command

gitolite supports running a command like:

 ssh git@git-ie.linaro.org

which defaults to the "info" command:

 https://github.com/sitaramc/gitolite/blob/4ed15ad8e5d82995b3d55cd17446fc90a3c2b7ec/src/gitolite-shell#L153

our grok-shell was exiting with an error. This gets things compatible
again

Change-Id: I5f62365522e2ad6da2e2ab5ef941b07eaa15d596

1 files changed, 1 insertions, 3 deletions

diff --git a/grok-shell b/grok-shell
index 5c67281..16b7c34 100755
--- a/grok-shell
+++ b/grok-shell
@@ -98,9 +98,7 @@ if __name__ == '__main__':
     '''
     setup_logging()
 
-    cmd = os.environ.get('SSH_ORIGINAL_COMMAND')
-    if not cmd:
-        sys.exit('ERROR: script must be called from ssh context')
+    cmd = os.environ.get('SSH_ORIGINAL_COMMAND', 'info')
 
     if len(sys.argv) < 2 or sys.argv[1] not in ('slave', 'master'):
         sys.exit('Usage: %s [slave|master] ...' % sys.argv[0])