From f244e3e68ed176ff6636894a67e5c08fbbaeaefc Mon Sep 17 00:00:00 2001
From: Andrew Schoen <aschoen@redhat.com>
Date: Fri, 24 Apr 2020 12:11:52 -0500
Subject: [PATCH] ceph-volume: handle idempotency with batch and explicit
 scenarios

If you used --wal-devices or --db-devices with batch and too
many devices are filtered out then a RuntimeError was raised.

However, if --report and --format=json is used then we
should return valid json indicating that no OSDS will be created
so that ceph-ansible and other systems can use that for idempotency checks.

Resolves: rhbz#1827349

Signed-off-by: Andrew Schoen <aschoen@redhat.com>
(cherry picked from commit 9b8254edc8ee6c91809119120970b722edb100b7)
---
 .../ceph_volume/devices/lvm/batch.py          |  6 ++++
 .../tests/devices/lvm/test_batch.py           | 30 +++++++++++++++++--
 2 files changed, 34 insertions(+), 2 deletions(-)

diff --git a/src/ceph-volume/ceph_volume/devices/lvm/batch.py b/src/ceph-volume/ceph_volume/devices/lvm/batch.py
index b7a4b35b2fd2..a83c8680bf33 100644
--- a/src/ceph-volume/ceph_volume/devices/lvm/batch.py
+++ b/src/ceph-volume/ceph_volume/devices/lvm/batch.py
@@ -1,5 +1,6 @@
 import argparse
 import logging
+import json
 from textwrap import dedent
 from ceph_volume import terminal, decorators
 from ceph_volume.util import disk, prompt_bool
@@ -376,6 +377,11 @@ class Batch(object):
                 # filtered
                 if self.args.yes and dev_list and self.usable and devs != usable:
                     err = '{} devices were filtered in non-interactive mode, bailing out'
+                    if self.args.format == "json" and self.args.report:
+                        # if a json report is requested, report unchanged so idempotency checks
+                        # in ceph-ansible will work
+                        print(json.dumps({"changed": False, "osds": [], "vgs": []}))
+                        raise SystemExit(0)
                     raise RuntimeError(err.format(len(devs) - len(usable)))
 
 
diff --git a/src/ceph-volume/ceph_volume/tests/devices/lvm/test_batch.py b/src/ceph-volume/ceph_volume/tests/devices/lvm/test_batch.py
index 1c3c25f67e31..06a37c4906c2 100644
--- a/src/ceph-volume/ceph_volume/tests/devices/lvm/test_batch.py
+++ b/src/ceph-volume/ceph_volume/tests/devices/lvm/test_batch.py
@@ -1,4 +1,5 @@
 import pytest
+import json
 from ceph_volume.devices.lvm import batch
 
 
@@ -133,7 +134,7 @@ class TestFilterDevices(object):
             abspath="/dev/sda",
             rotational=True,
             is_lvm_member=False,
-            available=True
+            available=True,
         )
         ssd1 = factory(
             used_by_ceph=True,
@@ -143,9 +144,34 @@ class TestFilterDevices(object):
             available=False
         )
         args = factory(devices=[hdd1], db_devices=[ssd1], filtered_devices={},
-                      yes=True)
+                      yes=True, format="", report=False)
         b = batch.Batch([])
         b.args = args
         with pytest.raises(RuntimeError) as ex:
             b._filter_devices()
             assert '1 devices were filtered in non-interactive mode, bailing out' in str(ex.value)
+
+    def test_no_auto_prints_json_on_unavailable_device_and_report(self, factory, capsys):
+        hdd1 = factory(
+            used_by_ceph=False,
+            abspath="/dev/sda",
+            rotational=True,
+            is_lvm_member=False,
+            available=True,
+        )
+        ssd1 = factory(
+            used_by_ceph=True,
+            abspath="/dev/nvme0n1",
+            rotational=False,
+            is_lvm_member=True,
+            available=False
+        )
+        captured = capsys.readouterr()
+        args = factory(devices=[hdd1], db_devices=[ssd1], filtered_devices={},
+                      yes=True, format="json", report=True)
+        b = batch.Batch([])
+        b.args = args
+        with pytest.raises(SystemExit):
+            b._filter_devices()
+            result = json.loads(captured.out)
+            assert not result["changed"]
-- 
2.47.3