werf/trdl

package tuf

import (
    "io"
    "os"
    "path/filepath"

    tufClient "github.com/theupdateframework/go-tuf/client"
    tufUtil "github.com/theupdateframework/go-tuf/util"
)

func (c Client) DownloadFile(targetName, dest string, destMode os.FileMode) error {
    if err := os.MkdirAll(filepath.Dir(dest), os.ModePerm); err != nil {
        return err
    }

    f, err := os.OpenFile(dest, os.O_RDWR|os.O_CREATE, destMode)
    if err != nil {
        return err
    }
    defer func() { _ = f.Close() }()

    file := destinationFile{f}
    if err := c.Download(targetName, &file); err != nil {
        return err
    }

    return nil
}

type destinationFile struct {
    *os.File
}

func (t *destinationFile) Delete() error {
    _ = t.Close()
    return os.Remove(t.Name())
}

func (c Client) Download(targetName string, destination tufClient.Destination) error {
    return c.Client.Download(tufUtil.NormalizeTarget(targetName), destination)
}

func (c Client) DownloadMeta(name string) ([]byte, error) {
    ioReader, _, err := c.RemoteStore.GetMeta(name)
    if err != nil {
        return nil, err
    }

    return io.ReadAll(ioReader)
}