{"record":{"id":"7c0b6ec54d762b86","repo":"kubernetes/kops","slug":"error-from-acl-provider-q-w","errorCode":null,"errorMessage":"error from acl provider %q: %w","messagePattern":"error from acl provider %q: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"util/pkg/vfs/acls/plugins.go","lineNumber":41,"sourceCode":"\n\t\"k8s.io/kops/pkg/apis/kops\"\n\t\"k8s.io/kops/util/pkg/vfs\"\n)\n\nvar (\n\tstrategies      map[string]ACLStrategy\n\tstrategiesMutex sync.Mutex\n)\n\n// GetACL returns the ACL for the vfs.Path, by consulting all registered strategies\nfunc GetACL(ctx context.Context, p vfs.Path, cluster *kops.Cluster) (vfs.ACL, error) {\n\tstrategiesMutex.Lock()\n\tdefer strategiesMutex.Unlock()\n\n\tfor k, strategy := range strategies {\n\t\tacl, err := strategy.GetACL(ctx, p, cluster)\n\t\tif err != nil {\n\t\t\treturn nil, fmt.Errorf(\"error from acl provider %q: %w\", k, err)\n\t\t}\n\t\tif acl != nil {\n\t\t\treturn acl, nil\n\t\t}\n\t}\n\treturn nil, nil\n}\n\n// RegisterPlugin adds the strategy to the registered strategies\nfunc RegisterPlugin(key string, strategy ACLStrategy) {\n\tstrategiesMutex.Lock()\n\tdefer strategiesMutex.Unlock()\n\n\tif strategies == nil {\n\t\tstrategies = make(map[string]ACLStrategy)\n\t}\n\n\tstrategies[key] = strategy","sourceCodeStart":23,"sourceCodeEnd":59,"githubUrl":"https://github.com/kubernetes/kops/blob/4c8573c808a73d578c5eadc86d410646ea0b0d73/util/pkg/vfs/acls/plugins.go#L23-L59","documentation":"This is the generic wrapper in the ACL strategy registry: each registered ACL strategy (GCE, AWS, etc.) is tried in turn, and if a strategy's GetACL returns an error it is wrapped as `error from acl provider %q: %w` naming the strategy key. It signals that a specific cloud ACL provider failed, with the underlying provider error preserved via %w.","triggerScenarios":"Any call to the ACL GetACL dispatcher where an individual registered strategy (e.g. the GCS strategy of error 3800) returns a non-nil error — e.g. unqueryable bucket, cloud API auth failure, or malformed cluster/path input handed to the strategy.","commonSituations":"Chained failure surfaces: the real cause (403 from GCS, missing credentials) arrives wrapped with the provider name prefixed; developers see this line and must unwrap to find the cloud-specific cause.","solutions":["Unwrap the error chain (%w) with errors.Unwrap or errors.As to reach the underlying cloud-provider error and fix that cause.","Check credentials/IAM for the cloud provider named in the %q placeholder.","If one provider is consistently failing and irrelevant to your storage backend, ensure only the appropriate ACL strategy is registered/compiled in.","Retry if the wrapped cause is transient (network, rate limit)."],"exampleFix":"// before\nacl, err := vfs.GetACL(ctx, p, cluster)\nif err != nil { return err }\n// after\nacl, err := vfs.GetACL(ctx, p, cluster)\nif err != nil {\n    var target *googleapi.Error\n    if errors.As(err, &target) && target.Code == 403 { /* fix IAM */ }\n    return fmt.Errorf(\"GetACL: %w\", err)\n}","handlingStrategy":"try-catch","validationCode":"// Pre-flight: ensure the cloud credentials for your backend work before ACL calls\ncreds := os.Getenv(\"GOOGLE_APPLICATION_CREDENTIALS\")\nif creds == \"\" { return fmt.Errorf(\"GOOGLE_APPLICATION_CREDENTIALS not set\") }\nif _, err := os.Stat(creds); err != nil { return err }","typeGuard":"func unwrapProvider(err error) (provider string, cause error) {\n    provider := \"unknown\"\n    for err != nil {\n        if u, ok := err.(interface{ Unwrap() error }); ok {\n            cause = u.Unwrap()\n            if cause != nil && !strings.Contains(cause.Error(), \"error from acl provider\") { break }\n            err = cause\n            continue\n        }\n        break\n    }\n    return provider, err\n}","tryCatchPattern":"acl, err := GetACL(ctx, p, cluster)\nif err != nil {\n    if strings.Contains(err.Error(), \"error from acl provider\") {\n        cause := errors.Unwrap(err) // inspect the provider-specific cause\n        log.Printf(\"acl provider failed: %v (cause: %v)\", err, cause)\n    }\n    return err\n}","preventionTips":["Always errors.Unwrap/As to reach the root cause instead of matching on the wrapper text","Keep credentials for every registered ACL provider valid in your environment","Register only the ACL strategies matching your storage backend","Add provider-level health checks before batch VFS operations"],"tags":["vfs","acl","error-wrapping","plugins"],"backgroundTag":"acl-provider-failed","analyzedSha":"4c8573c808a73d578c5eadc86d410646ea0b0d73","analyzedAt":"2026-09-05T04:13:19.212Z","contentChangedAt":"2026-09-05T04:13:19.212Z","schemaVersion":2},"datasetVersion":"2026-09-12T07:17:12.445Z"}