packer-cn/builder/googlecompute/networking.go

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package googlecompute
import (
"fmt"
"strings"
)
// This method will build a network and subnetwork ID from the provided
// instance config, and return them in that order.
func getNetworking(c *InstanceConfig) (string, string, error) {
networkId := c.Network
subnetworkId := c.Subnetwork
// Apply network naming requirements per
// https://cloud.google.com/compute/docs/reference/latest/instances#resource
switch c.Network {
// It is possible to omit the network property as long as a subnet is
// specified. That will be validated later.
case "":
break
// This special short name should be expanded.
case "default":
networkId = "global/networks/default"
// A value other than "default" was provided for the network name.
default:
// If the value doesn't contain a slash, we assume it's not a full or
// partial URL. We will expand it into a partial URL here and avoid
// making an API call to discover the network as it's common for the
// caller to not have permission against network discovery APIs.
if !strings.Contains(c.Network, "/") {
networkId = "projects/" + c.NetworkProjectId + "/global/networks/" + c.Network
}
}
// Apply subnetwork naming requirements per
// https://cloud.google.com/compute/docs/reference/latest/instances#resource
switch c.Subnetwork {
case "":
// You can't omit both subnetwork and network
if networkId == "" {
return networkId, subnetworkId, fmt.Errorf("both network and subnetwork were empty.")
}
// An empty subnetwork is only valid for networks in legacy mode or
// auto-subnet mode. We could make an API call to get that information
// about the network, but it's common for the caller to not have
// permission to that API. We'll proceed assuming they're correct in
// omitting the subnetwork and let the compute.insert API surface an
// error about an invalid network configuration if it exists.
break
default:
// If the value doesn't contain a slash, we assume it's not a full or
// partial URL. We will expand it into a partial URL here and avoid
// making a call to discover the subnetwork.
if !strings.Contains(c.Subnetwork, "/") {
subnetworkId = "projects/" + c.NetworkProjectId + "/regions/" + c.Region + "/subnetworks/" + c.Subnetwork
}
}
return networkId, subnetworkId, nil
}