func unpackIt(a archive.Archive, src string) error {
reader, writer := io.Pipe()
cw := make(chan error, 1)
defer close(cw)
f, err := os.Open(src)
if err != nil {
return err
}
go func() {
defer writer.Close()
_, err = io.Copy(writer, f)
if err != nil {
cw <- err
return
}
}()
return a.Unpack("/tmp/extracted", reader)
}
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 restoreCache(src string, s storage.Storage, a archive.Archive) error {
reader, writer := io.Pipe()
cw := make(chan error, 1)
defer close(cw)
go func() {
defer writer.Close()
cw <- s.Get(src, writer)
}()
err := a.Unpack("", reader)
werr := <-cw
if werr != nil {
return werr
}
return err
}
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
}