landing_worker: delete patch content after landing (bug 1879536)

- delete patch content after landing
- add one-time cli command to do this for previously landed jobs

landoapi/cli.py

@@ -107,6 +107,20 @@ def run_post_deploy_sequence():
     )
 
 
+@cli.command(name="clean-landing-job-patches")
+def clean_landing_job_patches():
+    """Iterate over all landed jobs and delete their patches."""
+    from landoapi.models.landing_job import LandingJob, LandingJobStatus
+    from landoapi.storage import db, db_subsystem
+
+    db_subsystem.ensure_ready()
+    jobs = LandingJob.query.filter(LandingJob.status == LandingJobStatus.LANDED).all()
+    for job in jobs:
+        for revision in job.revisions:
+            revision.patch_bytes = b""
+    db.session.commit()
+
+
 @cli.command(context_settings={"ignore_unknown_options": True})
 @click.argument("celery_arguments", nargs=-1, type=click.UNPROCESSED)
 def celery(celery_arguments):

landoapi/workers/landing_worker.py

@@ -439,6 +439,11 @@ def run_job(
             LandingJobAction.LAND, commit_id=commit_id, commit=True, db=db
         )
 
+        # Patches are no longer necessary, delete them.
+        for revision in job.revisions:
+            revision.patch_bytes = b""
+        db.session.commit()
+
         mots_path = Path(hgrepo.path) / "mots.yaml"
         if mots_path.exists():
             logger.info(f"{mots_path} found, setting reviewer data.")