Merge ~mwhudson/curtin:install-to-resyncing-raid into curtin:master

[Michael Hudson-Doyle]

mdadm: allow installation to a syncing array

LP: #1939563

[Dan Bungert (dbungert)]

LGTM

review: Approve

[Server Team CI bot (server-team-bot)]

FAILED: Continuous integration, rev:c102e4113143f6318d1c945a87fc0b6d0ca0f49a
https://jenkins.ubuntu.com/server/job/curtin-ci/164/
Executed test runs:
    FAILURE: https://jenkins.ubuntu.com/server/job/curtin-ci/nodes=metal-amd64/164/
    ABORTED: https://jenkins.ubuntu.com/server/job/curtin-ci/nodes=metal-arm64/164/
    FAILURE: https://jenkins.ubuntu.com/server/job/curtin-ci/nodes=metal-ppc64el/164/
    SUCCESS: https://jenkins.ubuntu.com/server/job/curtin-ci/nodes=metal-s390x/164/

Click here to trigger a rebuild:
https://jenkins.ubuntu.com/server/job/curtin-ci/164//rebuild

review: Needs Fixing (continuous-integration)

[Michael Hudson-Doyle (mwhudson)]

that was infrastructure failing, trying again

[Michael Hudson-Doyle (mwhudson)]

Well something else went wrong with the retry but after all the subtests succeeded so going to try merging this.

[Server Team CI bot (server-team-bot)]

review: Approve (continuous-integration)

diff --git a/curtin/block/mdadm.py b/curtin/block/mdadm.py
index a5dfc9f..7bb6b96 100644
--- a/curtin/block/mdadm.py
+++ b/curtin/block/mdadm.py
@@ -749,8 +749,9 @@ def md_check_array_state(md_devname):
         raise ValueError('Array not in writable state: ' + md_devname)
     if degraded is not None and degraded != "0":
         raise ValueError('Array in degraded state: ' + md_devname)
-    if degraded is not None and sync_action != "idle":
-        raise ValueError('Array syncing, not idle state: ' + md_devname)
+    if degraded is not None and sync_action not in ("idle", "resync"):
+        raise ValueError(
+            'Array is %s, not idle: %s' % (sync_action, md_devname))
 
 
 def md_check_uuid(md_devname):