// UnpackArchive unpacks the archive. The target archive to unpack is
// set for the command during parameter parsing.
func (self *TarGzUnpackCommand) UnpackArchive() error {
// get a reader for the source file
f, _, tarReader, err := archive.TarGzReader(self.Source)
if err != nil {
return fmt.Errorf("error opening tar file %v for reading: %v",
self.Source, err)
}
defer f.Close()
// extract the actual tarball into the destination directory
if err := os.MkdirAll(self.DestDir, 0755); err != nil {
return fmt.Errorf("error creating destination dir %v: %v", self.DestDir,
err)
}
return archive.Extract(tarReader, self.DestDir)
}
// Fetch the specified resource from s3.
func (self *S3GetCommand) Get() error {
// get the appropriate session and bucket
auth := &aws.Auth{
AccessKey: self.AwsKey,
SecretKey: self.AwsSecret,
}
session := thirdparty.NewS3Session(auth, aws.USEast)
bucket := session.Bucket(self.Bucket)
// get a reader for the bucket
reader, err := bucket.GetReader(self.RemoteFile)
if err != nil {
return fmt.Errorf("error getting bucket reader for file %v: %v",
self.RemoteFile, err)
}
defer reader.Close()
// either untar the remote, or just write to a file
if self.LocalFile != "" {
// remove the file, if it exists
exists, err := util.FileExists(self.LocalFile)
if err != nil {
return fmt.Errorf("error checking existence of local file %v: %v",
self.LocalFile, err)
}
if exists {
if err := os.RemoveAll(self.LocalFile); err != nil {
return fmt.Errorf("error clearing local file %v: %v",
self.LocalFile, err)
}
}
// open the local file
file, err := os.Create(self.LocalFile)
if err != nil {
return fmt.Errorf("error opening local file %v: %v", self.LocalFile,
err)
}
defer file.Close()
_, err = io.Copy(file, reader)
return err
} else {
// wrap the reader in a gzip reader and a tar reader
gzipReader, err := gzip.NewReader(reader)
if err != nil {
return fmt.Errorf("error creating gzip reader for %v: %v",
self.RemoteFile, err)
}
tarReader := tar.NewReader(gzipReader)
err = archive.Extract(tarReader, self.ExtractTo)
if err != nil {
return fmt.Errorf("error extracting %v to %v: %v", self.RemoteFile,
self.ExtractTo, err)
}
}
return nil
}