tests/functional: Fix bad usage of has_cmd

has_cmd returns a tuple, not a boolean value. This fixes a crash when
e.g. "tesseract" is not available in the test_m68k_nextcube test.

Reported-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20240910075820.51346-1-thuth@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>

tests/functional/qemu_test/cmd.py

@@ -187,7 +187,7 @@ def get_qemu_img(test):
     qemu_img = os.path.join(BUILD_DIR, 'qemu-img')
     if os.path.exists(qemu_img):
         return qemu_img
-    if has_cmd('qemu-img'):
+    (has_system_qemu_img, errmsg) = has_cmd('qemu-img')
+    if has_system_qemu_img:
         return 'qemu-img'
-    test.skipTest('Could not find "qemu-img", which is required to '
-                  'create temporary images')
+    test.skipTest(errmsg)

tests/functional/qemu_test/tesseract.py

@@ -11,7 +11,8 @@ import logging
 from . import has_cmd, run_cmd
 
 def tesseract_available(expected_version):
-    if not has_cmd('tesseract'):
+    (has_tesseract, _) = has_cmd('tesseract')
+    if not has_tesseract:
         return False
     (stdout, stderr, ret) = run_cmd([ 'tesseract', '--version'])
     if ret: