terraform/backend/local/backend_refresh.go

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package local
import (
"context"
"fmt"
"os"
"github.com/hashicorp/errwrap"
"github.com/hashicorp/go-multierror"
"github.com/hashicorp/terraform/backend"
clistate "github.com/hashicorp/terraform/command/state"
"github.com/hashicorp/terraform/state"
)
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) {
runningOp.Err = fmt.Errorf(
"The Terraform state file for your infrastructure does not\n"+
"exist. The 'refresh' command only works and only makes sense\n"+
"when there is existing state that Terraform is managing. Please\n"+
"double-check the value given below and try again. If you\n"+
"haven't created infrastructure with Terraform yet, use the\n"+
"'terraform apply' command.\n\n"+
"Path: %s",
b.StatePath)
return
}
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
}
}
// Get our context
tfCtx, opState, err := b.context(op)
if err != nil {
runningOp.Err = err
return
}
if op.LockState {
lockInfo := state.NewLockInfo()
lockInfo.Operation = op.Type.String()
lockID, err := clistate.Lock(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()
// Perform operation and write the resulting state to the running op
newState, err := tfCtx.Refresh()
runningOp.State = newState
if err != nil {
runningOp.Err = errwrap.Wrapf("Error refreshing state: {{err}}", err)
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
}
}