[OE-Core][PATCH 3/4] testimage: add target disk usage stat as post action

["Alexis Lothoré" <alexis.lothore@bootlin.com>]

From: Alexis Lothoré <alexis.lothore@bootlin.com>

In order to debug issues related to disk space (see [1]),  add a failed
tests post action to retrieve disk usage on the target. Rely on the test
context object to run the corresponding command onto the target

[1] https://bugzilla.yoctoproject.org/show_bug.cgi?id=15220

Signed-off-by: Alexis Lothoré <alexis.lothore@bootlin.com>
---
 .../failed-tests-post-actions.bbclass           | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/meta/classes-recipe/failed-tests-post-actions.bbclass b/meta/classes-recipe/failed-tests-post-actions.bbclass
index eaf08fb792f3..a8604fca2b9d 100644
--- a/meta/classes-recipe/failed-tests-post-actions.bbclass
+++ b/meta/classes-recipe/failed-tests-post-actions.bbclass
@@ -5,6 +5,20 @@
 #
 
 
+##################################################################
+# Host/target statistics
+##################################################################
+
+def get_target_disk_usage(d, tc):
+    output_file = os.path.join(get_testimage_json_result_dir(d), "artifacts", "target_disk_usage.txt")
+    try:
+        (status, output) = tc.target.run('df -hl')
+        with open(output_file, 'w') as f:
+            f.write(output)
+            f.write("\n")
+    except Exception as e:
+        bb.warn(f"Can not get target disk usage: {e}")
+
 ##################################################################
 # Artifacts retrieval
 ##################################################################
@@ -61,7 +75,8 @@ def list_and_fetch_failed_tests_artifacts(d, tc):
 def run_failed_tests_post_actions(d, tc):
     post_actions=[
         create_artifacts_directory,
-        list_and_fetch_failed_tests_artifacts
+        list_and_fetch_failed_tests_artifacts,
+        get_target_disk_usage
     ]
 
     for action in post_actions:
-- 
2.43.1