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package main
import (
"archive/tar"
"compress/gzip"
"io"
"os"
"path/filepath"
"strings"
)
// From https://gist.github.com/mimoo/25fc9716e0f1353791f5908f94d6e726
// Modified to strip off top-level when compressing
func compress(src string, buf io.Writer) error {
// tar > gzip > buf
zr := gzip.NewWriter(buf)
tw := tar.NewWriter(zr)
// walk through every file in the folder
err := filepath.Walk(src, func(file string, fi os.FileInfo, e error) error {
// generate tar header
header, err := tar.FileInfoHeader(fi, file)
if err != nil {
return err
}
// must provide real name
// (see https://golang.org/src/archive/tar/common.go?#L626)
header.Name = strings.TrimPrefix(filepath.ToSlash(file), src+"/")
// write header
if err := tw.WriteHeader(header); err != nil {
return err
}
// if not a dir, write file content
if !fi.IsDir() {
data, err := os.Open(file)
if err != nil {
return err
}
if _, err = io.Copy(tw, data); err != nil {
return err
}
if err = data.Close(); err != nil {
return err
}
}
return nil
})
if err != nil {
return err
}
// produce tar
if err := tw.Close(); err != nil {
return err
}
// produce gzip
if err := zr.Close(); err != nil {
return err
}
//
return nil
}
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