terraform/backend/remote-state/kubernetes/backend_state.go

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package kubernetes
import (
"errors"
"fmt"
"sort"
"github.com/hashicorp/terraform/backend"
"github.com/hashicorp/terraform/state"
"github.com/hashicorp/terraform/state/remote"
"github.com/hashicorp/terraform/states"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
// Workspaces returns a list of names for the workspaces found in k8s. The default
// workspace is always returned as the first element in the slice.
func (b *Backend) Workspaces() ([]string, error) {
secretClient, err := b.KubernetesSecretClient()
if err != nil {
return nil, err
}
secrets, err := secretClient.List(
metav1.ListOptions{
LabelSelector: tfstateKey + "=true",
},
)
if err != nil {
return nil, err
}
// Use a map so there aren't duplicate workspaces
m := make(map[string]struct{})
for _, secret := range secrets.Items {
sl := secret.GetLabels()
ws, ok := sl[tfstateWorkspaceKey]
if !ok {
continue
}
key, ok := sl[tfstateSecretSuffixKey]
if !ok {
continue
}
// Make sure it isn't default and the key matches
if ws != backend.DefaultStateName && key == b.nameSuffix {
m[ws] = struct{}{}
}
}
states := []string{backend.DefaultStateName}
for k := range m {
states = append(states, k)
}
sort.Strings(states[1:])
return states, nil
}
func (b *Backend) DeleteWorkspace(name string) error {
if name == backend.DefaultStateName || name == "" {
return fmt.Errorf("can't delete default state")
}
client, err := b.remoteClient(name)
if err != nil {
return err
}
return client.Delete()
}
func (b *Backend) StateMgr(name string) (state.State, error) {
c, err := b.remoteClient(name)
if err != nil {
return nil, err
}
stateMgr := &remote.State{Client: c}
// Grab the value
if err := stateMgr.RefreshState(); err != nil {
return nil, err
}
// If we have no state, we have to create an empty state
if v := stateMgr.State(); v == nil {
lockInfo := state.NewLockInfo()
lockInfo.Operation = "init"
lockID, err := stateMgr.Lock(lockInfo)
if err != nil {
return nil, err
}
secretName, err := c.createSecretName()
if err != nil {
return nil, err
}
// Local helper function so we can call it multiple places
unlock := func(baseErr error) error {
if err := stateMgr.Unlock(lockID); err != nil {
const unlockErrMsg = `%v
Additionally, unlocking the state in Kubernetes failed:
Error message: %q
Lock ID (gen): %v
Secret Name: %v
You may have to force-unlock this state in order to use it again.
The Kubernetes backend acquires a lock during initialization to ensure
the initial state file is created.`
return fmt.Errorf(unlockErrMsg, baseErr, err.Error(), lockID, secretName)
}
return baseErr
}
if err := stateMgr.WriteState(states.NewState()); err != nil {
return nil, unlock(err)
}
if err := stateMgr.PersistState(); err != nil {
return nil, unlock(err)
}
// Unlock, the state should now be initialized
if err := unlock(nil); err != nil {
return nil, err
}
}
return stateMgr, nil
}
// get a remote client configured for this state
func (b *Backend) remoteClient(name string) (*RemoteClient, error) {
if name == "" {
return nil, errors.New("missing state name")
}
secretClient, err := b.KubernetesSecretClient()
if err != nil {
return nil, err
}
leaseClient, err := b.KubernetesLeaseClient()
if err != nil {
return nil, err
}
client := &RemoteClient{
kubernetesSecretClient: secretClient,
kubernetesLeaseClient: leaseClient,
namespace: b.namespace,
labels: b.labels,
nameSuffix: b.nameSuffix,
workspace: name,
}
return client, nil
}
func (b *Backend) client() *RemoteClient {
return &RemoteClient{}
}