func unpackIndex(ctx context.Context, pack *indexpack.Archive, dir string) error {
fetcher := pack.Fetcher(ctx)
return pack.ReadUnits(ctx, formatKey, func(u interface{}) error {
unit, ok := u.(*apb.CompilationUnit)
if !ok {
return fmt.Errorf("%T is not a CompilationUnit", u)
}
idx, err := kindex.FromUnit(unit, fetcher)
if err != nil {
return fmt.Errorf("error creating kindex: %v", err)
}
path := kindexPath(dir, idx)
if !*quiet {
log.Println("Writing compilation unit to", path)
}
f, err := vfs.Create(ctx, path)
if err != nil {
return fmt.Errorf("error creating output file: %v", err)
}
if _, err := idx.WriteTo(f); err != nil {
f.Close() // try to close file before returning
return fmt.Errorf("error writing output file: %v", err)
}
return f.Close()
})
}
