gcloud data-catalog tag-templates set-iam-policy

gcloud data-catalog tag-templates set-iam-policy - set the IAM policy for a Cloud Data Catalog tag template
gcloud data-catalog tag-templates set-iam-policy (TAG_TEMPLATE : --location=LOCATION) POLICY_FILE [GCLOUD_WIDE_FLAG]
Sets the IAM policy for the given Cloud Data Catalog tag template as defined in a JSON or YAML file.
Tag template resource - Tag template to set the IAM policy for. The arguments in this group can be used to specify the attributes of this 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 [tag_template] on the command line with a fully specified name; set the property [core/project]; provide the argument [--project] on the command line. This must be specified.
ID of the tag template or fully qualified identifier for the tag template. This positional must be specified if any of the other arguments in this group are specified.
Location of the tag template.
Path to a local JSON or YAML formatted file containing a valid policy.

The output of the get-iam-policy command is a valid file, as is any JSON or YAML file conforming to the structure of a Policy.

These flags are available to all commands: --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.

This command uses the datacatalog/v1 API. The full documentation for this API can be found at: https://cloud.google.com/data-catalog/docs/
The following command will read am IAM policy defined in a JSON file 'policy.json' and set it for the tag template 'my-tag-template' with location 'my-location':
gcloud data-catalog tag-templates set-iam-policy my-tag-template --location=my-location policy.json

See https://cloud.google.com/iam/docs/managing-policies for details of the policy file format and contents.

These variants are also available:
gcloud alpha data-catalog tag-templates set-iam-policy
gcloud beta data-catalog tag-templates set-iam-policy