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