You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: environ.go
    path of file: ./repos/juju/provider/maas
    
    the code of the file until where you have to start completion: // Copyright 2013 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.

package maas

import (
	stdcontext "context"
	"fmt"
	"net/http"
	"regexp"
	"strconv"
	"strings"
	"sync"
	"time"

	"github.com/juju/clock"
	"github.com/juju/collections/set"
	"github.com/juju/errors"
	"github.com/juju/gomaasapi/v2"
	"github.com/juju/names/v5"
	"github.com/juju/retry"
	"github.com/juju/version/v2"

	"github.com/juju/juju/cloudconfig/cloudinit"
	"github.com/juju/juju/cloudconfig/instancecfg"
	"github.com/juju/juju/cloudconfig/providerinit"
	corebase "github.com/juju/juju/core/base"
	"github.com/juju/juju/core/con
    
func (env *maasEnviron) waitForNodeDeployment(ctx context.ProviderCallContext, id instance.Id, timeout time.Duration) error {
	retryStrategy := env.longRetryStrategy
	retryStrategy.MaxDuration = timeout
	retryStrategy.IsFatalError = func(err error) bool {
		if errors.IsNotProvisioned(err) {
			return true
		}
		if denied := common.MaybeHandleCredentialError(IsAuthorisationFailure, err, ctx); denied {
			return true
		}
		return false
	}
	retryStrategy.NotifyFunc = func(lastErr error, attempts int) {
		if errors.IsNotFound(lastErr) {
			logger.Warningf("failed to get instance from provider attempt %d", attempts)
		}
	}
	retryStrategy.Func = func() error {
		machine, err := env.getInstance(ctx, id)
		if err != nil {
			return err
		}
		stat := machine.Status(ctx)
		if stat.Status == status.Running {
			return nil
		}
		if stat.Status == status.ProvisioningError {
			return errors.NewNotProvisioned(nil, fmt.Sprintf("instance %q failed to deploy", id))
		}
		return errors.NewNotYetAvailable(nil, "Not yet provisioned")
	}
	err := retry.Call(retryStrategy)
	if retry.IsAttemptsExceeded(err) || retry.IsDurationExceeded(err) {
		return errors.Errorf("instance %q is started but not deployed", id)
	}
	return errors.Trace(err)
}