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|
package backup
import (
"archive/tar"
"compress/gzip"
"context"
"fmt"
"io"
"os"
"path/filepath"
)
// ArchiveFS walks the filesystem starting from basedir writing files encountered
// tarred and gzipped to the provided writer
func ArchiveFS(ctx context.Context, basedir string, w io.Writer) error {
gz := gzip.NewWriter(w)
tarball := tar.NewWriter(gz)
errChan := make(chan error, 1)
walkFn := func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
hdr, err := tar.FileInfoHeader(info, "")
if err != nil {
return err
}
hdr.Name = path
err = tarball.WriteHeader(hdr)
if err != nil {
return err
}
if !info.IsDir() {
src, err := os.Open(path)
if err != nil {
return err
}
defer src.Close()
_, err = io.Copy(tarball, src)
if err != nil {
return err
}
err = tarball.Flush()
if err != nil {
return err
}
err = gz.Flush()
if err != nil {
return err
}
}
return nil
}
// stop processing if we get a cancellation signal
err := filepath.Walk(basedir, func(path string, info os.FileInfo, err error) error {
go func() { errChan <- walkFn(path, info, err) }()
select {
case <-ctx.Done():
if err := ctx.Err(); err != nil {
return err
}
case err := <-errChan:
if err != nil {
return err
}
}
return nil
})
if err != nil {
fmt.Println(err)
return err
}
err = gz.Close()
if err != nil {
return err
}
err = tarball.Close()
if err != nil {
return err
}
return nil
}
|
