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/*
* Copyright 2020 Intel Corporation, Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package utils
import (
"archive/tar"
"compress/gzip"
"io"
pkgerrors "github.com/pkg/errors"
)
func IsTarGz(r io.Reader) error {
//Check if it is a valid gz
gzf, err := gzip.NewReader(r)
if err != nil {
return pkgerrors.Wrap(err, "Invalid gzip format")
}
//Check if it is a valid tar file
//Unfortunately this can only be done by inspecting all the tar contents
tarR := tar.NewReader(gzf)
first := true
for true {
header, err := tarR.Next()
if err == io.EOF {
//Check if we have just a gzip file without a tar archive inside
if first {
return pkgerrors.New("Empty or non-existant Tar file found")
}
//End of archive
break
}
if err != nil {
return pkgerrors.Errorf("Error reading tar file %s", err.Error())
}
//Check if files are of type directory and regular file
if header.Typeflag != tar.TypeDir &&
header.Typeflag != tar.TypeReg {
return pkgerrors.Errorf("Unknown header in tar %s, %s",
header.Name, string(header.Typeflag))
}
first = false
}
return nil
}
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