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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"
"io/ioutil"
"os"
"path"
"path/filepath"
pkgerrors "github.com/pkg/errors"
)
//ExtractTarBall provides functionality to extract a tar.gz file
//into a temporary location for later use.
//It returns the path to the new location
func ExtractTarBall(r io.Reader) (string, 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
outDir, _ := ioutil.TempDir("", "k8s-ext-")
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.Wrap(err, "Error reading tar file")
}
target := filepath.Join(outDir, header.Name)
switch header.Typeflag {
case tar.TypeDir:
if _, err := os.Stat(target); err != nil {
// Using 755 read, write, execute for owner
// groups and others get read and execute permissions
// on the folder.
if err := os.MkdirAll(target, 0755); err != nil {
return "", pkgerrors.Wrap(err, "Creating directory")
}
}
case tar.TypeReg:
if target == outDir { // Handle '.' substituted to '' entry
continue
}
err = EnsureDirectory(target)
if err != nil {
return "", pkgerrors.Wrap(err, "Creating Directory")
}
f, err := os.OpenFile(target, os.O_CREATE|os.O_RDWR, os.FileMode(header.Mode))
if err != nil {
return "", pkgerrors.Wrap(err, "Creating file")
}
// copy over contents
if _, err := io.Copy(f, tarR); err != nil {
return "", pkgerrors.Wrap(err, "Copying file content")
}
// close for each file instead of a defer for all
// at the end of the function
f.Close()
}
first = false
}
return outDir, nil
}
//EnsureDirectory makes sure that the directories specified in the path exist
//If not, it will create them, if possible.
func EnsureDirectory(f string) error {
base := path.Dir(f)
_, err := os.Stat(base)
if err != nil && !os.IsNotExist(err) {
return err
}
return os.MkdirAll(base, 0755)
}
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