package local import ( "context" "fmt" "log" "os" "strings" "github.com/hashicorp/errwrap" "github.com/hashicorp/go-multierror" "github.com/hashicorp/terraform/backend" "github.com/hashicorp/terraform/command/clistate" "github.com/hashicorp/terraform/config/module" "github.com/hashicorp/terraform/state" "github.com/hashicorp/terraform/terraform" ) func (b *Local) opRefresh( ctx context.Context, op *backend.Operation, runningOp *backend.RunningOperation) { // Check if our state exists if we're performing a refresh operation. We // only do this if we're managing state with this backend. if b.Backend == nil { if _, err := os.Stat(b.StatePath); err != nil { if os.IsNotExist(err) { err = nil } if err != nil { runningOp.Err = fmt.Errorf( "There was an error reading the Terraform state that is needed\n"+ "for refreshing. The path and error are shown below.\n\n"+ "Path: %s\n\nError: %s", b.StatePath, err) return } } } // If we have no config module given to use, create an empty tree to // avoid crashes when Terraform.Context is initialized. if op.Module == nil { op.Module = module.NewEmptyTree() } // Get our context tfCtx, opState, err := b.context(op) if err != nil { runningOp.Err = err return } if op.LockState { lockCtx, cancel := context.WithTimeout(ctx, op.StateLockTimeout) defer cancel() lockInfo := state.NewLockInfo() lockInfo.Operation = op.Type.String() lockID, err := clistate.Lock(lockCtx, opState, lockInfo, b.CLI, b.Colorize()) if err != nil { runningOp.Err = errwrap.Wrapf("Error locking state: {{err}}", err) return } defer func() { if err := clistate.Unlock(opState, lockID, b.CLI, b.Colorize()); err != nil { runningOp.Err = multierror.Append(runningOp.Err, err) } }() } // Set our state runningOp.State = opState.State() if runningOp.State.Empty() || !runningOp.State.HasResources() { if b.CLI != nil { b.CLI.Output(b.Colorize().Color( strings.TrimSpace(refreshNoState) + "\n")) } } // Perform the refresh in a goroutine so we can be interrupted var newState *terraform.State var refreshErr error doneCh := make(chan struct{}) go func() { defer close(doneCh) newState, refreshErr = tfCtx.Refresh() log.Printf("[INFO] backend/local: refresh calling Refresh") }() select { case <-ctx.Done(): if b.CLI != nil { b.CLI.Output("stopping refresh operation...") } // Stop execution go tfCtx.Stop() // Wait for completion still <-doneCh case <-doneCh: } // write the resulting state to the running op runningOp.State = newState if refreshErr != nil { runningOp.Err = errwrap.Wrapf("Error refreshing state: {{err}}", refreshErr) return } // Write and persist the state if err := opState.WriteState(newState); err != nil { runningOp.Err = errwrap.Wrapf("Error writing state: {{err}}", err) return } if err := opState.PersistState(); err != nil { runningOp.Err = errwrap.Wrapf("Error saving state: {{err}}", err) return } } const refreshNoState = ` [reset][bold][yellow]Empty or non-existent state file.[reset][yellow] Refresh will do nothing. Refresh does not error or return an erroneous exit status because many automation scripts use refresh, plan, then apply and may not have a state file yet for the first run. `