isle/go/cmd/entrypoint/bootstrap_util.go

package main

import (
	"errors"
	"fmt"
	"io/fs"
	"isle/bootstrap"
	"os"
	"path/filepath"
)

func loadHostBootstrap() (bootstrap.Bootstrap, error) {

	stateDirPath := bootstrap.StateDirPath(envStateDirPath)

	hostBootstrap, err := bootstrap.FromFile(stateDirPath)
	if errors.Is(err, fs.ErrNotExist) {
		return bootstrap.Bootstrap{}, fmt.Errorf(
			"%q not found, has the daemon ever been run?",
			stateDirPath,
		)

	} else if err != nil {
		return bootstrap.Bootstrap{}, fmt.Errorf("loading %q: %w", stateDirPath, err)
	}

	return hostBootstrap, nil
}

func writeBootstrapToStateDir(hostBootstrap bootstrap.Bootstrap) error {

	path := bootstrap.StateDirPath(envStateDirPath)
	dirPath := filepath.Dir(path)

	if err := os.MkdirAll(dirPath, 0700); err != nil {
		return fmt.Errorf("creating directory %q: %w", dirPath, err)
	}

	f, err := os.Create(path)
	if err != nil {
		return fmt.Errorf("creating file %q: %w", path, err)
	}

	defer f.Close()

	return hostBootstrap.WriteTo(f)
}