terraform/builtin/providers/google/resource_compute_instance_g...

75 lines
1.7 KiB
Go

package google
import (
"fmt"
"log"
"strconv"
"strings"
"github.com/hashicorp/terraform/helper/schema"
"github.com/hashicorp/terraform/terraform"
)
func resourceComputeInstanceGroupMigrateState(
v int, is *terraform.InstanceState, meta interface{}) (*terraform.InstanceState, error) {
if is.Empty() {
log.Println("[DEBUG] Empty InstanceState; nothing to migrate.")
return is, nil
}
switch v {
case 0:
log.Println("[INFO] Found Compute Instance Group State v0; migrating to v1")
is, err := migrateInstanceGroupStateV0toV1(is)
if err != nil {
return is, err
}
return is, nil
default:
return is, fmt.Errorf("Unexpected schema version: %d", v)
}
}
func migrateInstanceGroupStateV0toV1(is *terraform.InstanceState) (*terraform.InstanceState, error) {
log.Printf("[DEBUG] Attributes before migration: %#v", is.Attributes)
newInstances := []string{}
for k, v := range is.Attributes {
if !strings.HasPrefix(k, "instances.") {
continue
}
if k == "instances.#" {
continue
}
// Key is now of the form instances.%d
kParts := strings.Split(k, ".")
// Sanity check: two parts should be there and <N> should be a number
badFormat := false
if len(kParts) != 2 {
badFormat = true
} else if _, err := strconv.Atoi(kParts[1]); err != nil {
badFormat = true
}
if badFormat {
return is, fmt.Errorf("migration error: found instances key in unexpected format: %s", k)
}
newInstances = append(newInstances, v)
delete(is.Attributes, k)
}
for _, v := range newInstances {
hash := schema.HashString(v)
newKey := fmt.Sprintf("instances.%d", hash)
is.Attributes[newKey] = v
}
log.Printf("[DEBUG] Attributes after migration: %#v", is.Attributes)
return is, nil
}