Properly surface errors from build commands

podman_compose.py

@@ -2613,7 +2613,7 @@ async def compose_build(compose, args):
     status = 0
     for t in asyncio.as_completed(tasks):
         s = await t
-        if s is not None:
+        if s is not None and s != 0:
             status = s
 
     return status

tests/integration/build_fail_multi/bad/Dockerfile

@@ -0,0 +1,3 @@
+FROM busybox
+
+RUN false

tests/integration/build_fail_multi/docker-compose.yml

@@ -0,0 +1,8 @@
+version: "3"
+services:
+  bad:
+    build:
+      context: bad
+  good:
+    build:
+      context: good

tests/integration/build_fail_multi/good/Dockerfile

@@ -0,0 +1,3 @@
+FROM busybox
+#ensure that this build finishes second so that it has a chance to overwrite the return code
+RUN sleep 0.5

tests/integration/build_fail_multi/test_podman_compose_build_fail_multi.py

@@ -0,0 +1,31 @@
+# SPDX-License-Identifier: GPL-2.0
+
+import os
+import unittest
+
+from tests.integration.test_utils import RunSubprocessMixin
+from tests.integration.test_utils import podman_compose_path
+from tests.integration.test_utils import test_path
+
+
+def compose_yaml_path():
+    """ "Returns the path to the compose file used for this test module"""
+    base_path = os.path.join(test_path(), "build_fail_multi")
+    return os.path.join(base_path, "docker-compose.yml")
+
+
+class TestComposeBuildFailMulti(unittest.TestCase, RunSubprocessMixin):
+    def test_build_fail_multi(self):
+        output, error = self.run_subprocess_assert_returncode(
+            [
+                podman_compose_path(),
+                "-f",
+                compose_yaml_path(),
+                "build",
+                # prevent the successful build from being cached to ensure it runs long enough
+                "--no-cache",
+            ],
+            expected_returncode=1,
+        )
+        self.assertIn("RUN false", str(output))
+        self.assertIn("while running runtime: exit status 1", str(error))