// 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
}

MinIO server allows WORM for specific objects or by configuring a bucket with default object lock configuration that applies default retention mode and retention duration to all objects. This makes objects in the bucket immutable i.e. delete of the version are not allowed until an expiry specified in the bucket's object lock configuration or object retention.

### Retrieving Container ID

To use Docker commands on a specific container, you need to know the `Container ID` for that container. To get the `Container ID`, run

```sh
docker ps -a
```

`-a` flag makes sure you get all the containers (Created, Running, Exited). Then identify the `Container ID` from the output.

### Starting and Stopping Containers

### WebIdentityToken

The OAuth 2.0 id_token that is provided by the web identity provider. Application must get this token by authenticating the user who is using your application with a web identity provider before the application makes an AssumeRoleWithWebIdentity call.

| Params               | Value                                          |
| :--                  | :--                                            |

allowHostPID: false allowHostPorts: false allowPrivilegeEscala: true allowPrivilegedConta: false allowedCapabilities: [] readOnlyRootFilesyst: false defaultAddCapabiliti: [] requiredDropCapabili: - KILL - MKNOD - SETUID - SETGID fsGroup: type: MustRunAs ranges: - max: {{ .Values.securityContext.fsGroup }} min: {{ .Values.securityContext.fsGroup }} runAsUser: type: MustRunAs uid: {{ .Values.securityContext.runAsUser }} seLinuxContext: type: MustRunAs supplementalGroups: type: RunAsAny volumes: - configMap...

allowHostPID: false allowHostPorts: false allowPrivilegeEscala: true allowPrivilegedConta: false allowedCapabilities: [] readOnlyRootFilesyst: false defaultAddCapabiliti: [] requiredDropCapabili: - KILL - MKNOD - SETUID - SETGID fsGroup: type: MustRunAs ranges: - max: {{ .Values.securityContext.fsGroup }} min: {{ .Values.securityContext.fsGroup }} runAsUser: type: MustRunAs uid: {{ .Values.securityContext.runAsUser }} seLinuxContext: type: MustRunAs supplementalGroups: type: RunAsAny volumes: - configMap...

	expectedMap.Set("Access-Control-Allow-Origin", "http://foobar.com")
	expectedMap["Access-Control-Expose-Headers"] = []string{
		"Date",
		"Etag",
		"Server",
		"Connection",
		"Accept-Ranges",
		"Content-Range",
		"Content-Encoding",
		"Content-Length",
		"Content-Type",
		"Content-Disposition",
		"Last-Modified",
		"Content-Language",
		"Cache-Control",
		"Retry-After",

### Cluster-writeable probe

The reply is '200 OK' if cluster has write quorum if not it returns '503 Service Unavailable'.

```
curl http://minio1:9001/minio/health/cluster
HTTP/1.1 503 Service Unavailable
Accept-Ranges: bytes
Content-Length: 0
Server: MinIO
Vary: Origin
X-Amz-Bucket-Region: us-east-1
X-Minio-Write-Quorum: 3
X-Amz-Request-Id: 16239D6AB80EBECF
X-Xss-Protection: 1; mode=block
Date: Tue, 21 Jul 2020 00:36:14 GMT

file will take 200 MiB space. But, if you use ten data and six parity drives, same 100 MiB file takes around 160 MiB. If you use 14 data and
two parity drives, 100 MiB file takes only approximately 114 MiB.

Below is a list of data/parity drives and corresponding _approximate_ storage space usage on a 16 drive MinIO deployment. The field _storage

package cmd

import (
	"context"
	"errors"
	"fmt"
	"io"
	"strings"

	"github.com/minio/madmin-go/v3"
	xhttp "github.com/minio/minio/internal/http"
)

// WarmBackendGetOpts is used to express byte ranges within an object. The zero
// value represents the entire byte range of an object.
type WarmBackendGetOpts struct {
	startOffset int64
	length      int64
}