terraform/backend/local/backend_refresh.go

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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(
stopCtx context.Context,
cancelCtx 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(stopCtx, 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)
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newState, refreshErr = tfCtx.Refresh()
log.Printf("[INFO] backend/local: refresh calling Refresh")
}()
if b.opWait(doneCh, stopCtx, cancelCtx, tfCtx, opState) {
return
}
// 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.
`