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

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

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

Since the target under test can be a virtualized guest, when some tests
fail because of disk usage (see [1]), also fetch disk usage statistics from
host to allow checking whether a host disk space saturation could affect
running tests.

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

Signed-off-by: Alexis Lothoré <alexis.lothore@bootlin.com>
---
 .../failed-tests-post-actions.bbclass               | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/meta/classes-recipe/failed-tests-post-actions.bbclass b/meta/classes-recipe/failed-tests-post-actions.bbclass
index a8604fca2b9d..a9e92aa2427e 100644
--- a/meta/classes-recipe/failed-tests-post-actions.bbclass
+++ b/meta/classes-recipe/failed-tests-post-actions.bbclass
@@ -19,6 +19,16 @@ def get_target_disk_usage(d, tc):
     except Exception as e:
         bb.warn(f"Can not get target disk usage: {e}")
 
+def get_host_disk_usage(d, tc):
+    import subprocess
+
+    output_file = os.path.join(get_testimage_json_result_dir(d), "artifacts", "host_disk_usage.txt")
+    try:
+        with open(output_file, 'w') as f:
+            output = subprocess.run(['/usr/bin/df', '-hl'], check=True, text=True, stdout=f)
+    except Exception as e:
+        bb.warn(f"Can not get host disk usage: {e}")
+
 ##################################################################
 # Artifacts retrieval
 ##################################################################
@@ -76,7 +86,8 @@ def run_failed_tests_post_actions(d, tc):
     post_actions=[
         create_artifacts_directory,
         list_and_fetch_failed_tests_artifacts,
-        get_target_disk_usage
+        get_target_disk_usage,
+        get_host_disk_usage
     ]
 
     for action in post_actions:
-- 
2.43.1