/// <summary>
/// Constructs an importer instance for a previously uploaded manifest. The manifest is downloaded using
/// a new Amazon S3 client constructed for the specified region and deserialized, ready for use in
/// constructing the appropriate ImportInstance or ImportVolume request to Amazon EC2.
/// </summary>
/// <param name="credentials">
/// The AWS credentials for the account that owns or has access to the bucket containing the manifest file.
/// </param>
/// <param name="region">The region in which the Amazon S3 client used for download will be constructed.</param>
/// <param name="bucketName">The name of the bucket containing the manifest file.</param>
/// <param name="manifestFileKey">The S3 object key of the manifest file.</param>
/// <param name="resumingUpload">
/// Set this to true if a previous upload failed part-way through processing and RetainArtifactsOnUploadError
/// was set to true so the partially uploaded content was retained. The existing manifest will
/// be inspected and uploads can then resume to process the retaining content.
/// </param>
/// <returns>Initialized importer instance containing a deserialized manifest</returns>
public static DiskImageImporter FromManifest(AWSCredentials credentials,
RegionEndpoint region,
string bucketName,
string manifestFileKey,
bool resumingUpload)
{
try
{
var importer = new DiskImageImporter(credentials, region, bucketName)
{
ManifestFileKey = manifestFileKey
};
importer.DeserializeManifestFromS3();
if (resumingUpload)
importer.DetermineRemainingUploads();
return importer;
}
catch (AmazonS3Exception e)
{
var msg = string.Format(CultureInfo.InvariantCulture,
"Failed to download the specified manifest from bucket {0} with key {1}",
bucketName,
manifestFileKey);
throw new DiskImageImporterException(DiskImportErrorStage.ManifestInspection, msg, e);
}
catch (XmlException e)
{
throw new DiskImageImporterException(DiskImportErrorStage.ManifestInspection,
"Failed to deserialize the downloaded manifest",
e);
}
}
