[OE-Core][PATCH v3 4/5] oeqa/utils/postactions: 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>
---
Changes in v2:
- - use new shared helper get_json_result_dir()
---
 meta/lib/oeqa/utils/postactions.py | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/meta/lib/oeqa/utils/postactions.py b/meta/lib/oeqa/utils/postactions.py
index 7014b2830a9c..008968b56a3f 100644
--- a/meta/lib/oeqa/utils/postactions.py
+++ b/meta/lib/oeqa/utils/postactions.py
@@ -18,6 +18,20 @@ def create_artifacts_directory(d, tc):
 
     os.makedirs(local_artifacts_dir)
 
+##################################################################
+# Host/target statistics
+##################################################################
+
+def get_target_disk_usage(d, tc):
+    output_file = os.path.join(get_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
 ##################################################################
@@ -65,7 +79,8 @@ 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