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fieldManager: Ignore conversion errors to internal types #77987

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merged 1 commit into from
May 18, 2019
Merged

fieldManager: Ignore conversion errors to internal types #77987

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1 change: 1 addition & 0 deletions staging/src/k8s.io/apiserver/pkg/endpoints/handlers/fieldmanager/BUILD
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,7 @@ go_library(
"//staging/src/k8s.io/apimachinery/pkg/runtime:go_default_library",
"//staging/src/k8s.io/apimachinery/pkg/runtime/schema:go_default_library",
"//staging/src/k8s.io/apiserver/pkg/endpoints/handlers/fieldmanager/internal:go_default_library",
"//vendor/k8s.io/klog:go_default_library",
"//vendor/k8s.io/kube-openapi/pkg/util/proto:go_default_library",
"//vendor/sigs.k8s.io/structured-merge-diff/fieldpath:go_default_library",
"//vendor/sigs.k8s.io/structured-merge-diff/merge:go_default_library",
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9 changes: 7 additions & 2 deletions staging/src/k8s.io/apiserver/pkg/endpoints/handlers/fieldmanager/fieldmanager.go
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Expand Up @@ -27,6 +27,7 @@ import (
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apiserver/pkg/endpoints/handlers/fieldmanager/internal"
"k8s.io/klog"
openapiproto "k8s.io/kube-openapi/pkg/util/proto"
"sigs.k8s.io/structured-merge-diff/fieldpath"
"sigs.k8s.io/structured-merge-diff/merge"
Expand Down Expand Up @@ -115,11 +116,15 @@ func (f *FieldManager) Update(liveObj, newObj runtime.Object, manager string) (r
internal.RemoveObjectManagedFields(newObjVersioned)
newObjTyped, err := f.typeConverter.ObjectToTyped(newObjVersioned)
if err != nil {
return nil, fmt.Errorf("failed to create typed new object: %v", err)
// Return newObj and just by-pass fields update. This really shouldn't happen.
klog.Errorf("[SHOULD NOT HAPPEN] failed to create typed new object: %v", err)
return newObj, nil
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This seems mostly safe to me, but if newObjVersioned is just a pointer to newObj (in the case where f.toVersioned(newObj) is a no-op) then we would be wiping the managed fields. It wouldn't really be an issue though because this should never happen if managed fields is working correctly

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Should we make a copy of the object when it's a no-op?

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Looks like it already does a copy, that seems to be the difference between ConvertToVersion and UnsafeConvertToVersion

}
liveObjTyped, err := f.typeConverter.ObjectToTyped(liveObjVersioned)
if err != nil {
return nil, fmt.Errorf("failed to create typed live object: %v", err)
// Return newObj and just by-pass fields update. This really shouldn't happen.
klog.Errorf("[SHOULD NOT HAPPEN] failed to create typed live object: %v", err)
return newObj, nil
}
apiVersion := fieldpath.APIVersion(f.groupVersion.String())
manager, err = f.buildManagerInfo(manager, metav1.ManagedFieldsOperationUpdate)
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