[Piglit] [PATCH] framework tests: fix binary_check utility bug

[Dylan Baker]

This patch changes binary_check to work when a binary is present, but
doesn't work for some reason.

The example here is in the json content tests, where it looks for
glxinfo, but if X isn't running glxinfo provides no output, which will
cause a test to fail. This isn't useful, so instead of using the *nix
command 'which', call the command and allow an expected returncode to be
passed, if the returncode isn't that returncode, then skip.

Signed-off-by: Dylan Baker <dylanx.c.baker at intel.com>
---
 framework/tests/base_tests.py |  2 +-
 framework/tests/utils.py      | 24 +++++++++++++++++++-----
 2 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/framework/tests/base_tests.py b/framework/tests/base_tests.py
index a9e0e88..7b2920d 100644
--- a/framework/tests/base_tests.py
+++ b/framework/tests/base_tests.py
@@ -57,7 +57,7 @@ def test_run_return_early():
 
 def test_timeout():
     """test.base.Test.run(): kills tests that exceed timeout when set"""
-    utils.binary_check('sleep')
+    utils.binary_check('sleep', 1)
 
     def helper():
         if (test.result['returncode'] == 0):
diff --git a/framework/tests/utils.py b/framework/tests/utils.py
index 55d2b6e..58f8c2f 100644
--- a/framework/tests/utils.py
+++ b/framework/tests/utils.py
@@ -32,6 +32,7 @@ import shutil
 import tempfile as tempfile_
 import functools
 import subprocess
+import errno
 from contextlib import contextmanager
 
 try:
@@ -276,13 +277,26 @@ def privileged_test(func):
     return func
 
 
-def binary_check(bin_):
-    """Check for the existance of a binary or raise SkipTest."""
+def binary_check(bin_, errno_=None):
+    """Check for the existance of a binary or raise SkipTest.
+
+    If an errno_ is provided then a skip test will be raised unless the error
+    number provided is raised, or no error is raised.
+
+    """
     with open(os.devnull, 'w') as null:
         try:
-            subprocess.check_call(['which', bin_], stdout=null, stderr=null)
-        except subprocess.CalledProcessError:
-            raise SkipTest('Binary {} not available'.format(bin_))
+            subprocess.check_call([bin_], stdout=null, stderr=null)
+        except OSError as e:
+            if e.errno == errno.ENOENT:
+                raise SkipTest('Binary {} not available'.format(bin_))
+        except subprocess.CalledProcessError as e:
+            if errno_ is not None and e.returncode == errno_:
+                pass
+            else:
+                raise SkipTest(
+                    'Binary provided bad returncode of {} (wanted {})'.format(
+                        e.returncode, errno_))
 
 
 def platform_check(plat):
-- 
2.5.0