// initialized when the provided function returns nil.

// Init represents the structure.
type Init struct {
	done uint32
	m    sync.Mutex
}

// Do is similar to sync.Once.Do - makes one successful
// call to the function. ie, it invokes the function
// if it is not successful yet.
func (l *Init) Do(f func() error) error {
	if atomic.LoadUint32(&l.done) == 0 {
		return l.do(f)
	}
	return nil
}

func testNonExistentBucketOperations(obj ObjectLayer, instanceType string, t TestErrHandler) {
	var opts ObjectOptions
	_, err := obj.PutObject(context.Background(), "bucket1", "object", mustGetPutObjReader(t, bytes.NewBufferString("one"), int64(len("one")), "", ""), opts)
	if err == nil {
		t.Fatal("Expected error but found nil")
	}
	if err.Error() != "Bucket not found: bucket1" {

	err = inferTypesForCmp(v, a)
	if err != nil {
		return false, err
	}

	// Check if either is nil
	if v.IsNull() || a.IsNull() {
		// If one is, both must be.
		return boolCompare(op, v.IsNull(), a.IsNull())
	}

	if a.IsMissing() || v.IsMissing() {
		// If one is, both must be.
		return boolCompare(op, v.IsMissing(), a.IsMissing())
	}

	// Check array values
	aArr, aOK := a.ToArray()

// Add - adds pattern and target ID.
func (rules Rules) Add(pattern string, targetID TargetID) {
	rules[pattern] = NewTargetIDSet(targetID).Union(rules[pattern])
}

// MatchSimple - returns true one of the matching object name in rules.
func (rules Rules) MatchSimple(objectName string) bool {
	for pattern := range rules {
		if wildcard.MatchSimple(pattern, objectName) {
			return true
		}
	}
	return false
}

}

// mrfState sncapsulates all the information
// related to the global background MRF.
type mrfState struct {
	opCh chan partialOperation
}

// Add a partial S3 operation (put/delete) when one or more disks are offline.
func (m *mrfState) addPartialOp(op partialOperation) {
	if m == nil {
		return
	}

	select {
	case m.opCh <- op:
	default:
	}
}

		if string(found) == key {
			vals = append(vals, value)
			plSize += len(value)
			replaced = true
		} else {
			vals = append(vals, foundVal)
			plSize += len(foundVal)
		}
	}

	// Add one more.
	if !replaced {
		keys = append(keys, []byte(key))
		vals = append(vals, value)
		plSize += len(key) + len(value) + msgp.StringPrefixSize + msgp.ArrayHeaderSize
	}

	// Reserialize...

    def _create_credentials_fetcher(self):
        method = self.METHOD

        def fetch_credentials():
            # HTTP headers are case insensitive filter out
            # all duplicate headers and pick one.
            headers = {}
            headers['content-type'] = 'application/x-www-form-urlencoded'
            headers['authorization'] = urllib3.make_headers(

			if tt.expectedWriteQuorum != actualWriteQuorum {
				t.Errorf("Expected Write Quorum %d, got %d", tt.expectedWriteQuorum, actualWriteQuorum)
			}
		})
	}
}

// In some deployments, one object has data inlined in one disk and not inlined in other disks.
func TestGetObjectInlineNotInline(t *testing.T) {
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

### 2. Set bucket WORM configuration

WORM on a bucket is enabled by setting object lock configuration. This configuration is applied to all the objects in the bucket. Below is an example to set `Governance` mode and one day retention time on `mybucket`.

```sh
awscli s3api put-object-lock-configuration --bucket mybucket --object-lock-configuration 'ObjectLockEnabled=\"Enabled\",Rule={DefaultRetention={Mode=\"GOVERNANCE\",Days=1}}'
```

}

// validateStatus - checks if status is valid or not.
func (r Rule) validateStatus() error {
	// Status can't be empty
	if len(r.Status) == 0 {
		return errEmptyRuleStatus
	}

	// Status must be one of Enabled or Disabled
	if r.Status != Enabled && r.Status != Disabled {
		return errInvalidRuleStatus
	}
	return nil
}

func (r Rule) validateExpiration() error {
	return r.Expiration.Validate()
}