gcloud beta pubsub topics set-iam-policy

NAME: gcloud beta pubsub topics set-iam-policy - set IAM policy for a topic
SYNOPSIS: gcloud beta pubsub topics set-iam-policy TOPIC POLICY_FILE [GCLOUD_WIDE_FLAG …]
DESCRIPTION: (BETA) Set the IAM policy for a Cloud Pub/Sub Topic.
EXAMPLES: The following command will read an IAM policy from 'policy.json' and set it for a topic with 'my-topic' as the identifier:
gcloud beta pubsub topics set-iam-policy my-topic policy.json
See https://cloud.google.com/iam/docs/managing-policies for details of the policy file format and contents.
POSITIONAL ARGUMENTS: Topic resource - Name of the topic to set an IAM policy on. This represents a Cloud resource. (NOTE) Some attributes are not given arguments in this group but can be set in other ways.
To set the project attribute:

provide the argument topic on the command line with a fully specified name;

provide the argument --project on the command line;

set the property core/project.

This must be specified.

TOPIC

ID of the topic or fully qualified identifier for the topic.
To set the topic attribute:

provide the argument topic on the command line.

POLICY_FILE

JSON or YAML file with the IAM policy
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 pubsub topics set-iam-policy

gcloud alpha pubsub topics set-iam-policy