/**
* Loads an image tarball into the Docker daemon.
*
* @see <a
* href="https://docs.docker.com/engine/reference/commandline/load/">https://docs.docker.com/engine/reference/commandline/load</a>
* @param imageTarball the built container tarball.
* @return stdout from {@code docker}.
* @throws InterruptedException if the 'docker load' process is interrupted.
* @throws IOException if streaming the blob to 'docker load' fails.
*/
public async Task <string> LoadAsync(IImageTarball imageTarball)
{
imageTarball = imageTarball ?? throw new ArgumentNullException(nameof(imageTarball));
// Runs 'docker load'.
IProcess dockerProcess = Docker("load");
using (Stream stdin = dockerProcess.GetOutputStream())
{
try
{
await imageTarball.WriteToAsync(stdin).ConfigureAwait(false);
}
catch (IOException ex)
{
// Tries to read from stderr.
string error;
try
{
using (TextReader stderr = dockerProcess.GetErrorReader())
{
error = await stderr.ReadToEndAsync().ConfigureAwait(false);
}
}
catch (IOException e)
{
// This ignores exceptions from reading stderr and throws the original exception from
// writing to stdin.
Debug.WriteLine(e);
error = null;
}
if (error is null)
{
throw;
}
throw new IOException("'docker load' command failed with error: " + error, ex);
}
}
using (Stream stdoutStream = dockerProcess.GetInputStream())
using (StreamReader stdout = new StreamReader(stdoutStream, Encoding.UTF8))
{
string output = await stdout.ReadToEndAsync().ConfigureAwait(false);
if (dockerProcess.WaitFor() != 0)
{
string errMessage = await GetErrorMessageAsync(dockerProcess).ConfigureAwait(false);
throw new IOException("'docker load' command failed with output: " + errMessage);
}
return(output);
}
}