## Concepts

- All Buckets on MinIO are always in one of the following states: unversioned (the default) and all other existing deployments, versioning-enabled, or versioning-suspended.
- Versioning state applies to all of the objects in the versioning enabled bucket. The first time you enable a bucket for versioning, objects in the bucket are thereafter always versioned and given a unique version ID.

}

// ObjectsVersionCountIntervals is the list of all intervals
// of object version count to be included in objects histogram.
var ObjectsVersionCountIntervals = [dataUsageVersionLen]objectHistogramInterval{
	{"UNVERSIONED", 0, 0},
	{"SINGLE_VERSION", 1, 1},
	{"BETWEEN_2_AND_10", 2, 9},
	{"BETWEEN_10_AND_100", 10, 99},
	{"BETWEEN_100_AND_1000", 100, 999},
	{"BETWEEN_1000_AND_10000", 1000, 9999},

		// any version, look for if the bucket is versioned or not.
		if objects[i].VersionID == "" {
			// MinIO extension to bucket version configuration
			suspended := opts.VersionSuspended
			versioned := opts.Versioned
			if opts.PrefixEnabledFn != nil {
				versioned = opts.PrefixEnabledFn(objects[i].ObjectName)
			}
			if versioned || suspended {
				// Bucket is versioned and no version was explicitly

		}
		// Destination is not versioned and source version ID is empty
		// perform an in-place update.
		if !dstOpts.Versioned && srcOpts.VersionID == "" {
			return z.serverPools[poolIdx].CopyObject(ctx, srcBucket, srcObject, dstBucket, dstObject, srcInfo, srcOpts, dstOpts)
		}
		// Destination is versioned, source is not destination version,

			}
		case "Transient":
			z.Transient, err = dc.ReadBool()
			if err != nil {
				err = msgp.WrapError(err, "Transient")
				return
			}
		case "Versioned":
			z.Versioned, err = dc.ReadBool()
			if err != nil {
				err = msgp.WrapError(err, "Versioned")
				return
			}
		case "V1":
			z.V1, err = dc.ReadBool()
			if err != nil {
				err = msgp.WrapError(err, "V1")
				return
			}

	return string(s) == ""
}

// VersionPurgeStatusType represents status of a versioned delete or permanent delete w.r.t bucket replication
type VersionPurgeStatusType string

const (
	// VersionPurgePending - versioned delete replication is pending.
	VersionPurgePending VersionPurgeStatusType = "PENDING"

	// VersionPurgeComplete - versioned delete replication is now complete, erase version on disk.

Note that just like with [AWS](https://docs.aws.amazon.com/AmazonS3/latest/userguide/delete-marker-replication.html), Delete marker replication is disallowed in MinIO when the replication rule has tags.

			disks[i], disks[j] = disks[j], disks[i]
		})

		filterLifecycle := func(bucket, object string, fi FileInfo) bool {
			if lc == nil {
				return false
			}
			versioned := vc != nil && vc.Versioned(object)
			objInfo := fi.ToObjectInfo(bucket, object, versioned)

			evt := evalActionFromLifecycle(ctx, *lc, lr, rcfg, objInfo)
			switch {
			case evt.Action.DeleteRestored(): // if restored copy has expired,delete it synchronously

	if err != nil {
		return opts, InvalidArgument{
			Bucket: bucket,
			Object: object,
			Err:    err,
		}
	}

	opts.VersionID = vid
	opts.Versioned = versioned
	opts.VersionSuspended = versionSuspended

	// For directory objects skip creating new versions.
	if isDirObject(object) && vid == "" {
		opts.VersionID = nullVersionID
	}

	return opts, nil
}

// It returns true if the listing is non-versioned and the given object is expired.
func triggerExpiryAndRepl(ctx context.Context, o listPathOptions, obj metaCacheEntry) (skip bool) {
	versioned := o.Versioning != nil && o.Versioning.Versioned(obj.name)

	// skip latest object from listing only for regular
	// listObjects calls, versioned based listing cannot
	// filter out between versions 'obj' cannot be truncated