gistfile1.txt

diff --git a/glanceclient/v1/shell.py b/glanceclient/v1/shell.py
index 02d3c01..e1b2a35 100644
--- a/glanceclient/v1/shell.py
+++ b/glanceclient/v1/shell.py
@@ -121,7 +121,10 @@ def _set_data_field(fields, args):
             # (3) no image data provided:
             #     glance ...
             try:
-                os.fstat(0)
+                stat_result = os.fstat(0)
+                if stat_result.st_size == 0:
+                    # (3) stdin is open but empty
+                    fields['data'] = None
             except OSError:
                 # (1) stdin is not valid (closed...)
                 fields['data'] = None