Currently used endpoint and the correct endpoint

The snapshot list of blockstorage v3 is using the following endpoint:

https://URL/v3/ADMIN_PROJECT_ID/snapshots?all_tenants=true

But this endpoint is missing some values (for example the project ID). To include all attributes of the snapshot the following endpoint should be used:

https://URL/v3/ADMIN_PROJECT_ID/snapshots/detail?all_tenants=true

Code cause for this issue

This is because a error in https://github.com/gophercloud/gophercloud/blob/master/openstack/blockstorage/v3/snapshots/urls.go. With the following code:

...
func createURL(c *gophercloud.ServiceClient) string {
	return c.ServiceURL("snapshots")
}
...
func listURL(c *gophercloud.ServiceClient) string {
	return createURL(c)
}
...

As comparison the url generation for the blockstorage volumes (which use the correct detail endpoint) https://github.com/gophercloud/gophercloud/blob/master/openstack/blockstorage/v3/volumes/urls.go

func listURL(c *gophercloud.ServiceClient) string {
	return c.ServiceURL("volumes", "detail")
}

Potential fix for this issue

This can be fixed by using the same logic for the snapshots like used for the volumes. That would look something like this:

func listURL(c *gophercloud.ServiceClient) string {
	return c.ServiceURL("snapshots", "detail")
}