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package packed
import "fmt"
// 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
}
// verifyPackMatchesIndexes checks that one opened pack's trailer hash matches
// every loaded index that references the same pack name.
func (store *Store) verifyPackMatchesIndexes(pack *packFile) error {
err := store.ensureCandidates()
if err != nil {
return err
}
candidate, ok := store.candidateForPack(pack.name)
if !ok {
return fmt.Errorf("objectstore/packed: missing index for pack %q", pack.name)
}
index, err := store.openIndex(candidate)
if err != nil {
return err
}
err = verifyMappedPackMatchesMappedIdx(pack.data, index.data, store.algo)
if err != nil {
return fmt.Errorf("objectstore/packed: pack %q does not match idx %q: %w", pack.name, index.idxName, err)
}
return nil
}
// entryMetaAt parses one pack entry header at location.
func (store *Store) entryMetaAt(loc location) (*packFile, entryMeta, error) {
pack, err := store.openPack(loc.packName)
if err != nil {
return nil, entryMeta{}, err
}
meta, err := parseEntryMeta(pack, store.algo, loc.offset)
if err != nil {
return nil, entryMeta{}, err
}
return pack, meta, nil
}
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