[PATCH v4 1/2] avocado_qemu/__init__.py: factor out the qemu-img finding

[Kautuk Consul]

Factor out the code that finds the qemu-img binary in the
QemuSystemTest class and create a new get_qemu_img() function
with it. This function will get called also from the new code
in tuxrun_baselines.py avocado test-case.

Signed-off-by: Kautuk Consul <kconsul@linux.vnet.ibm.com>
---
 tests/avocado/avocado_qemu/__init__.py | 27 +++++++++++++++-----------
 1 file changed, 16 insertions(+), 11 deletions(-)

diff --git a/tests/avocado/avocado_qemu/__init__.py 
b/tests/avocado/avocado_qemu/__init__.py
index cb71f50db9..d8f390e27a 100644
--- a/tests/avocado/avocado_qemu/__init__.py
+++ b/tests/avocado/avocado_qemu/__init__.py
@@ -330,6 +330,19 @@ def _new_vm(self, name, *args):
             vm.add_args(*args)
         return vm
 
+    def get_qemu_img(self):
+        self.log.debug('Looking for and selecting a qemu-img binary')
+
+        # If qemu-img has been built, use it, otherwise the system wide one
+        # will be used.
+        qemu_img = os.path.join(BUILD_DIR, 'qemu-img')
+        if not os.path.exists(qemu_img):
+            qemu_img = find_command('qemu-img', False)
+        if qemu_img is False:
+            self.cancel('Could not find "qemu-img"')
+
+        return qemu_img
+
     @property
     def vm(self):
         return self.get_vm(name='default')
@@ -594,17 +607,9 @@ def set_up_existing_ssh_keys(self):
         return (ssh_public_key, ssh_private_key)
 
     def download_boot(self):
-        self.log.debug('Looking for and selecting a qemu-img binary to be '
-                       'used to create the bootable snapshot image')
-        # If qemu-img has been built, use it, otherwise the system wide one
-        # will be used.  If none is available, the test will cancel.
-        qemu_img = os.path.join(BUILD_DIR, 'qemu-img')
-        if not os.path.exists(qemu_img):
-            qemu_img = find_command('qemu-img', False)
-        if qemu_img is False:
-            self.cancel('Could not find "qemu-img", which is required to '
-                        'create the bootable image')
-        vmimage.QEMU_IMG = qemu_img
+        # Set the qemu-img binary.
+        # If none is available, the test will cancel.
+        vmimage.QEMU_IMG = super().get_qemu_img()
 
         self.log.info('Downloading/preparing boot image')
         # Fedora 31 only provides ppc64le images
-- 
2.25.1