Praveen raj Mani <******@****.***> 1708976090 +0530

if [ ! -x "$PWD/minio" ]; then
	echo "minio executable binary not found in current directory"
	exit 1
fi

function start_minio_5drive() {
	start_port=$1

	export MINIO_ROOT_USER=minio
	export MINIO_ROOT_PASSWORD=minio123
	export MC_HOST_minio="http://minio:minio123@127.0.0.1:${start_port}/"
	unset MINIO_KMS_AUTO_ENCRYPTION # do not auto-encrypt objects
	export MINIO_CI_CD=1

	MC_BUILD_DIR="mc-$RANDOM"

	// If the directory has a different device as parent, then it is a mountpoint.
	if s1.Sys().(*syscall.Stat_t).Dev != s2.Sys().(*syscall.Stat_t).Dev {
		//  path/.. on a different device as path
		return true
	}

	// path/.. is the same i-node as path - this check is for bind mounts.
	return s1.Sys().(*syscall.Stat_t).Ino == s2.Sys().(*syscall.Stat_t).Ino
}

// CheckCrossDevice - check if any list of paths has any sub-mounts at /proc/mounts.

from datetime import datetime

from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()


class Subscription(BaseModel):
    username: str
    monthly_fee: float
    start_date: datetime


@app.webhooks.post("new-subscription")
def new_subscription(body: Subscription):
    """
    When a new user subscribes to your service we'll send you a POST request with this

./mc cp ./lrgfile minio1/newbucket
sleep 5
./mc stat minio2/newbucket
if [ $? -ne 0 ]; then
	echo "expecting bucket to be present. exiting.."
	exit_1
fi

./mc stat minio3/newbucket
if [ $? -ne 0 ]; then
	echo "expecting bucket to be present. exiting.."
	exit_1
fi

./mc cp README.md minio2/newbucket/

sleep 5
./mc stat minio1/newbucket/README.md
if [ $? -ne 0 ]; then

}

func (n *NetnsWrapper) Close() error {
	return n.innerNetns.Close()
}

func (n *NetnsWrapper) Fd() uintptr {
	return n.innerNetns.Fd()
}

func inodeForFd(n NetnsFd) (uint64, error) {
	stats := &unix.Stat_t{}
	err := unix.Fstat(int(n.Fd()), stats)
	return stats.Ino, err
}

func OpenNetns(nspath string) (NetnsCloser, error) {
	n, err := netns.GetNS(nspath)
	if err != nil {
		return nil, err
	}

	case syscall.O_RDWR | syscall.O_CREAT:
		lockType = syscall.F_WRLCK
	default:
		return nil, &os.PathError{
			Op:   "open",
			Path: path,
			Err:  syscall.EINVAL,
		}
	}

	lock := syscall.Flock_t{
		Start:  0,
		Len:    0,
		Pid:    0,
		Type:   lockType,
		Whence: 0,
	}

	f, err := os.OpenFile(path, flag, perm)
	if err != nil {
		return nil, err
	}

## Quick Start

Vamos utilizar essa aplicação como exemplo:

```Python hl_lines="9"
{!../../../docs_src/query_params_str_validations/tutorial001.py!}
```

O parâmetro de consulta `q` é do tipo `Union[str, None]`, o que significa que é do tipo `str` mas que também pode ser `None`, e de fato, o valor padrão é `None`, então o FastAPI saberá que não é obrigatório.

!!! note "Observação"

```Python hl_lines="7"
{!../../../docs_src/query_params_str_validations/tutorial005.py!}
```

!!! note
    具有默认值还会使该参数成为可选参数。

## 声明为必需参数

当我们不需要声明额外的校验或元数据时，只需不声明默认值就可以使 `q` 参数成为必需参数，例如：

```Python
q: str
```

代替：

```Python
q: Union[str, None] = None
```

但是现在我们正在用 `Query` 声明它，例如：

```Python
q: Union[str, None] = Query(default=None, min_length=3)
```