### 3.1 Automatic removal of non current objects versions

A non-current object version is a version which is not the latest for a given object. It is possible to set up an automatic removal of non-current versions when a version becomes older than a given number of days.

e.g., To scan objects stored under `user-uploads/` prefix and remove versions older than one year.

```
{
    "Rules": [
        {

	}
	versions, buf, e = msgp.ReadIntBytes(buf)
	if e != nil {
		return 0, buf, e
	}
	if versions < 0 {
		return 0, buf, fmt.Errorf("decodeXLHeaders: Negative version count %d", versions)
	}
	return versions, buf, nil
}

// decodeVersions will decode a number of versions from a buffer
// and perform a callback for each version in order, newest first.

			}
		case "VersionID":
			z.VersionID, err = dc.ReadString()
			if err != nil {
				err = msgp.WrapError(err, "VersionID")
				return
			}
		case "Versions":
			z.Versions, err = dc.ReadBytes(z.Versions)
			if err != nil {
				err = msgp.WrapError(err, "Versions")
				return
			}
		case "SetIndex":
			z.SetIndex, err = dc.ReadInt()
			if err != nil {
				err = msgp.WrapError(err, "SetIndex")
				return
			}

./mc cp README.md myminio1/testbucket/dir/file
./mc cp README.md myminio1/testbucket/dir/file

sleep 1s

echo "=== myminio1"
./mc ls --versions myminio1/testbucket/dir/file

echo "=== myminio2"
./mc ls --versions myminio2/testbucket/dir/file

versionId="$(./mc ls --json --versions myminio1/testbucket/dir/ | tail -n1 | jq -r .versionId)"

export AWS_ACCESS_KEY_ID=minioadmin
export AWS_SECRET_ACCESS_KEY=minioadmin

    protected static final int X_EQ_Y = 0;

    protected static final int X_GT_Y = 1;

    protected abstract Version newVersion(String version);

    protected void assertOrder(int expected, String version1, String version2) {
        Version v1 = newVersion(version1);
        Version v2 = newVersion(version2);

        if (expected > 0) {
            assertEquals(1, Integer.signum(v1.compareTo(v2)), "expected " + v1 + " > " + v2);

1/xl.meta XL2 Æ b ¨Versions‘‚¤Type ¥V2ObjÞ ¢IDÄ ¤DDirÄ ÔLã°ê8EÒŸˆ”Ù Sé6¦EcAlgo £EcM £EcN §EcBSizeÒ §EcIndex ¦EcDistš ¨CSumAlgo ¨PartNums‘ ©PartETags‘ ©PartSizes‘Ò 'ªPartASizes‘Ò '¤SizeÒ 'Â¥MTimeÓ ¿W '’žÉ§MetaSys ¼X-Minio-Internal-actual-sizeÄ 141250§MetaUsr‚¤etagÙ"51fe09d68bacc8c5a68a-1¬content-type¸application/octet-streamÎöa‰ 10/xl.meta XL2 Æ b ¨Versions‘‚¤Type ¥V2ObjÞ ¢IDÄ ¤DDirÄ ÔLã°ê8EÒŸˆ”Ù Sé6¦EcAlgo £EcM £EcN §EcBSizeÒ §EcIndex ¦EcDistš ¨CSumAlgo ¨PartNums‘ ©PartETags‘ ©PartSizes‘Ò 'ªPartASizes‘Ò...

      purge:
          # retainVersions: 0 # (default) delete all versions of the object. This option is the fastest.
          # retainVersions: 5 # keep the latest 5 versions of the object.
  
    - type: deleted # objects with delete marker as their latest version
      name: NAME # match object names that satisfy the wildcard expression.

- Existing or newer buckets can be created with versioning enabled and eventually can be suspended as well. Existing versions of objects stay as is and can still be accessed using the version ID.
- All versions, including delete-markers should be deleted before deleting a bucket.

## mirror some content to bucket2 and capture versions tiered
./mc mirror internal myminio/bucket2/ --quiet >/dev/null
./mc ls -r myminio/bucket2/ >bucket2_ns.txt
./mc ls -r --versions myminio/bucket2/ >bucket2_ns_versions.txt

sleep 30

./mc ls -r --versions mytier/tiered/ >tiered_ns_versions.txt

kill $pid

	report()
	fatalErr(err)

	// At this point the version stack must look as below,
	// v3 --> free version      00000000-0000-0000-0000-0000000000f2 (from removal of null version)
	// v2 --> free version      00000000-0000-0000-0000-0000000000f1 (from overwriting of null version )
	// v1 --> non-free version  00000000-0000-0000-0000-000000000001

	// Check number of free-versions