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gcloud beta iam list-grantable-roles

NAME
gcloud beta iam list-grantable-roles - list IAM grantable roles for a resource
SYNOPSIS
gcloud beta iam list-grantable-roles RESOURCE [--filter=EXPRESSION] [--page-size=PAGE_SIZE; default=300] [GCLOUD_WIDE_FLAG …]
DESCRIPTION
(BETA) This command displays the list of grantable roles for a resource. The resource can be referenced either via the full resource name or via a URI. User can then add IAM policy bindings to grant the roles.
EXAMPLES
List grantable roles for a project: 
gcloud beta iam list-grantable-roles //cloudresourcemanager.googleapis.com/projects/PROJECT_ID

List grantable roles for a resource identified via full resource name: 

gcloud beta iam list-grantable-roles //compute.googleapis.com/projects/example-project/zones/us-central1-f/instances/example-instance

List grantable roles for a resource identified via URI: 

gcloud beta iam list-grantable-roles https://www.googleapis.com/compute/v1/projects/example-project/\
zones/us-central1-f/instances/example-instance
POSITIONAL ARGUMENTS
RESOURCE
The full resource name or URI to get the list of roles for.

See "Resource Names" for details. To get a URI from most list commands in gcloud, pass the --uri flag. For example: 

gcloud compute instances list --project prj --uri https://compute.googleapis.com/compute/v1/projects/prj/zones/us-east1-c/instances/i1 https://compute.googleapis.com/compute/v1/projects/prj/zones/us-east1-d/instances/i2
LIST COMMAND FLAGS
--filter=EXPRESSION
Apply a Boolean filter EXPRESSION to each resource item to be listed. If the expression evaluates True, then that item is listed. For more details and examples of filter expressions, run $ gcloud topic filters. This flag interacts with other flags that are applied in this order: --flatten, --sort-by, --filter, --limit.
--page-size=PAGE_SIZE; default=300
Some services group resource list output into pages. This flag specifies the maximum number of resources per page. The default is 300. Paging may be applied before or after --filter and --limit depending on the service.
GCLOUD WIDE FLAGS
These flags are available to all commands: --access-token-file, --account, --billing-project, --configuration, --flags-file, --flatten, --format, --help, --impersonate-service-account, --log-http, --project, --quiet, --trace-token, --user-output-enabled, --verbosity.

Run $ gcloud help for details.

NOTES
This command is currently in beta and might change without notice. These variants are also available: 
gcloud iam list-grantable-roles
 
gcloud alpha iam list-grantable-roles