gcloud compute reservations get-iam-policy

gcloud compute reservations get-iam-policy - get the IAM policy for a Compute Engine reservation
gcloud compute reservations get-iam-policy (RESERVATION : --zone=ZONE) [--filter=EXPRESSION] [--limit=LIMIT] [--page-size=PAGE_SIZE] [--sort-by=[FIELD,…]] [GCLOUD_WIDE_FLAG]
gcloud compute reservations get-iam-policy displays the IAM policy associated with a Compute Engine reservation in a project. If formatted as JSON, the output can be edited and used as a policy file for set-iam-policy. The output includes an "etag" field identifying the version emitted and allowing detection of concurrent policy updates; see $ {parent} set-iam-policy for additional details.
Reservation resource - The reservation to display 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 [reservation] 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 reservation or fully qualified identifier for the reservation. This positional must be specified if any of the other arguments in this group are specified.
The name of the Google Compute Engine zone.
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.
Maximum number of resources to list. The default is unlimited. This flag interacts with other flags that are applied in this order: --flatten, --sort-by, --filter, --limit.
Some services group resource list output into pages. This flag specifies the maximum number of resources per page. The default is determined by the service if it supports paging, otherwise it is unlimited (no paging). Paging may be applied before or after --filter and --limit depending on the service.
Comma-separated list of resource field key names to sort by. The default order is ascending. Prefix a field with ``~´´ for descending order on that field. This flag interacts with other flags that are applied in this order: --flatten, --sort-by, --filter, --limit.
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 compute/v1 API. The full documentation for this API can be found at: https://developers.google.com/compute/docs/reference/latest/
To print the IAM policy for a given reservation, run:
gcloud compute reservations get-iam-policy my-reservation --zone=my-zone
These variants are also available:
gcloud alpha compute reservations get-iam-policy
gcloud beta compute reservations get-iam-policy