// error returned in IAM subsystem when an account doesn't exist.
var errNoSuchAccount = errors.New("Specified account does not exist")

// error returned in IAM subsystem when groups doesn't exist.
var errNoSuchGroup = errors.New("Specified group does not exist")

// error returned in IAM subsystem when a policy attach/detach request has no
// net effect, i.e. it is already applied.

### Core Features
- **Per-context configuration**: No global state, each context encapsulates configuration
- **Authentication**: NTLM, Kerberos, SPNEGO unified subsystem
- **SLF4J Logging**: Comprehensive logging throughout the codebase
- **Resource Management**: AutoCloseable patterns for file handles and connections
- **Thread Safety**: Components support concurrent access

package cmd

import (
	"strings"

	"github.com/minio/minio/internal/bucket/versioning"
	"github.com/minio/minio/internal/logger"
)

// BucketVersioningSys - policy subsystem.
type BucketVersioningSys struct{}

// Enabled enabled versioning?
func (sys *BucketVersioningSys) Enabled(bucket string) bool {
	vc, err := sys.Get(bucket)
	if err != nil {
		logger.CriticalIf(GlobalContext, err)

	if !globalIsDistErasure {
		sys.nodeName = ""
		return
	}

	host, err := xnet.ParseHost(globalLocalNodeName)
	if err != nil {
		logger.FatalIf(err, "Unable to start console logging subsystem")
	}

	sys.nodeName = host.Name
}

// HasLogListeners returns true if console log listeners are registered
// for this node or peers
func (sys *HTTPConsoleLoggerSys) HasLogListeners() bool {

PRs must flow smoothly through review to reach production. Large PRs should be split into smaller, manageable ones.

## Submitting PRs

1. **Title and Summary**:
   - Use a scannable title: `[Subsystem] Action Description #Issue` (e.g., `[IAM] Add role-based access control #567`).
   - Include context in the summary: what changed, why, and any issue references.

	"github.com/minio/minio/internal/handlers"
	xhttp "github.com/minio/minio/internal/http"
	"github.com/minio/minio/internal/logger"
	"github.com/minio/pkg/v3/policy"
)

// PolicySys - policy subsystem.
type PolicySys struct{}

// Get returns stored bucket policy
func (sys *PolicySys) Get(bucket string) (*policy.BucketPolicy, error) {
	policy, _, err := globalBucketMetadataSys.GetPolicyConfig(bucket)