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package reading
// openPack returns one opened and validated pack handle.
func (store *Store) openPack(name string) (*packFile, error) {
store.stateMu.RLock()
pack, ok := store.packs[name]
if ok {
store.stateMu.RUnlock()
return pack, nil
}
store.stateMu.RUnlock()
file, err := store.root.Open(name)
if err != nil {
return nil, err
}
info, err := file.Stat()
if err != nil {
_ = file.Close()
return nil, err
}
pack, err = openPackFile(name, file, info.Size())
if err != nil {
_ = file.Close()
return nil, err
}
err = store.verifyPackMatchesIndexes(pack)
if err != nil {
_ = pack.close()
return nil, err
}
store.stateMu.Lock()
existing, ok := store.packs[name]
if ok {
store.stateMu.Unlock()
_ = pack.close()
return existing, nil
}
store.packs[name] = pack
store.stateMu.Unlock()
return pack, nil
}
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