check read access instead of isfile() for Fuel ISO

When testing with nested virtualzation I attached
the Fuel ISO to VM (/dev/sr0) running deploy.sh

This failed because we expect the ISO to be a file, when
it could be a device, e.g. /dev/sr0.  Instead of checking isfile()
check for read access.

This tested with bsdtar. It can extract an ISO from a file or device.

Change-Id: Ic09373cd618b33382303d9134cce4e005040de95
Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>

diff --git a/deploy/common.py b/deploy/common.py
index 07ad543..51b70fe 100644 (file)
--- a/deploy/common.py
+++ b/deploy/common.py
@@ -140,7 +140,7 @@ def warn(message):
 def check_file_exists(file_path):
     if not os.path.dirname(file_path):
         file_path = '%s/%s' % (CWD, file_path)
-    if not os.path.isfile(file_path):
+    if not os.access(file_path, os.R_OK):
         err('ERROR: File %s not found\n' % file_path)