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resource_compute_instance_migrate.go
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resource_compute_instance_migrate.go
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package google
import (
"fmt"
"log"
"strconv"
"strings"
"github.com/hashicorp/terraform/helper/hashcode"
"github.com/hashicorp/terraform/terraform"
)
func resourceComputeInstanceMigrateState(
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 State v0; migrating to v1")
is, err := migrateStateV0toV1(is)
if err != nil {
return is, err
}
fallthrough
case 1:
log.Println("[INFO] Found Compute Instance State v1; migrating to v2")
is, err := migrateStateV1toV2(is)
if err != nil {
return is, err
}
return is, nil
default:
return is, fmt.Errorf("Unexpected schema version: %d", v)
}
}
func migrateStateV0toV1(is *terraform.InstanceState) (*terraform.InstanceState, error) {
log.Printf("[DEBUG] Attributes before migration: %#v", is.Attributes)
// Delete old count
delete(is.Attributes, "metadata.#")
newMetadata := make(map[string]string)
for k, v := range is.Attributes {
if !strings.HasPrefix(k, "metadata.") {
continue
}
// We have a key that looks like "metadata.*" and we know it's not
// metadata.# because we deleted it above, so it must be metadata.<N>.<key>
// from the List of Maps. Just need to convert it to a single Map by
// ditching the '<N>' field.
kParts := strings.SplitN(k, ".", 3)
// Sanity check: all three parts should be there and <N> should be a number
badFormat := false
if len(kParts) != 3 {
badFormat = true
} else if _, err := strconv.Atoi(kParts[1]); err != nil {
badFormat = true
}
if badFormat {
return is, fmt.Errorf(
"migration error: found metadata key in unexpected format: %s", k)
}
// Rejoin as "metadata.<key>"
newK := strings.Join([]string{kParts[0], kParts[2]}, ".")
newMetadata[newK] = v
delete(is.Attributes, k)
}
for k, v := range newMetadata {
is.Attributes[k] = v
}
log.Printf("[DEBUG] Attributes after migration: %#v", is.Attributes)
return is, nil
}
func migrateStateV1toV2(is *terraform.InstanceState) (*terraform.InstanceState, error) {
log.Printf("[DEBUG] Attributes before migration: %#v", is.Attributes)
// Maps service account index to list of scopes for that sccount
newScopesMap := make(map[string][]string)
for k, v := range is.Attributes {
if !strings.HasPrefix(k, "service_account.") {
continue
}
if k == "service_account.#" {
continue
}
if strings.HasSuffix(k, ".scopes.#") {
continue
}
if strings.HasSuffix(k, ".email") {
continue
}
// Key is now of the form service_account.%d.scopes.%d
kParts := strings.Split(k, ".")
// Sanity check: all three parts should be there and <N> should be a number
badFormat := false
if len(kParts) != 4 {
badFormat = true
} else if _, err := strconv.Atoi(kParts[1]); err != nil {
badFormat = true
}
if badFormat {
return is, fmt.Errorf(
"migration error: found scope key in unexpected format: %s", k)
}
newScopesMap[kParts[1]] = append(newScopesMap[kParts[1]], v)
delete(is.Attributes, k)
}
for service_acct_index, newScopes := range newScopesMap {
for _, newScope := range newScopes {
hash := hashcode.String(canonicalizeServiceScope(newScope))
newKey := fmt.Sprintf("service_account.%s.scopes.%d", service_acct_index, hash)
is.Attributes[newKey] = newScope
}
}
log.Printf("[DEBUG] Attributes after migration: %#v", is.Attributes)
return is, nil
}