func packIt(a archive.Archive, srcs []string, dst string) (error, error) {
reader, writer := io.Pipe()
defer reader.Close()
cw := make(chan error, 1)
defer close(cw)
go func() {
defer writer.Close()
cw <- a.Pack(srcs, writer)
}()
bytes, err := ioutil.ReadAll(reader)
ioutil.WriteFile(dst, bytes, 0644)
werr := <-cw
return err, werr
}
func rebuildCache(srcs []string, dst string, s storage.Storage, a archive.Archive) error {
log.Infof("Rebuilding cache at %s to %s", srcs, dst)
reader, writer := io.Pipe()
defer reader.Close()
cw := make(chan error, 1)
defer close(cw)
go func() {
defer writer.Close()
cw <- a.Pack(srcs, writer)
}()
err := s.Put(dst, reader)
werr := <-cw
if werr != nil {
return werr
}
return err
}