machine: Hide subprocess stacktrace when a command fails during build

Similar to #983 but when building the image instead of booting it.

diff --git a/mkosi/machine.py b/mkosi/machine.py
index 5b588d7990a63701af4c6ec14ef11abc35f56773..6a6a810e5fd21266e3f04867b005d7795a2186d3 100644 (file)
--- a/mkosi/machine.py
+++ b/mkosi/machine.py
@@ -205,7 +205,10 @@ class MkosiMachineTest(unittest.TestCase):
         if no_qemu and verb == Verb.qemu:
             raise unittest.SkipTest("Qemu test skipped due to environment variable.")
 
-        cls.machine.build()
+        try:
+            cls.machine.build()
+        except subprocess.CalledProcessError as e:
+            raise cls.failureException(f'Failed to build image because "{e.cmd}" failed with exit status {e.returncode}') from None
 
     def setUp(self) -> None:
         # Replacing underscores which makes name invalid.