// Untar files from input channel and pass the result to the output channel.
func Untar(opt Options) gonzo.Stage {
return func(ctx context.Context, in <-chan gonzo.File, out chan<- gonzo.File) error {
//Check patterns.
pluck := len(opt.Pluck) > 0
if pluck {
err := match.Good(opt.Pluck...)
if err != nil {
return err
}
}
for {
select {
case file, ok := <-in:
if !ok {
return nil
}
context.WithValue(ctx, "archive", file.FileInfo().Name()).Debug("Untaring")
tr := tar.NewReader(file)
defer file.Close()
// Iterate through the files in the archive.
for {
hdr, err := tr.Next()
if err == io.EOF {
// end of tar archive
break
}
if err != nil {
return err
}
name := strip(opt.StripComponenets, hdr.Name)
if pluck && !match.Any(name, opt.Pluck...) {
continue
}
context.WithValue(ctx, "file", name).Debug("Untaring")
content := new(bytes.Buffer)
n, err := content.ReadFrom(tr)
if err != nil {
return err
}
fs := gonzo.NewFile(ioutil.NopCloser(content), gonzo.FileInfoFrom(hdr.FileInfo()))
fs.FileInfo().SetName(name)
fs.FileInfo().SetSize(int64(n))
out <- fs
}
case <-ctx.Done():
return ctx.Err()
}
}
}
}
// Drop files that match at least one of te patterns.
func Drop(patterns ...string) gonzo.Stage {
return func(ctx context.Context, in <-chan gonzo.File, out chan<- gonzo.File) error {
//Check patterns.
err := match.Good(patterns...)
if err != nil {
return err
}
stage := Filter(func(file gonzo.File) bool { return !match.Any(file.FileInfo().Name(), patterns...) })
return stage(ctx, in, out)
}
}