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package repository
import (
"errors"
"fmt"
"os"
"codeberg.org/lindenii/furgit/objectid"
"codeberg.org/lindenii/furgit/refstore"
refchain "codeberg.org/lindenii/furgit/refstore/chain"
refloose "codeberg.org/lindenii/furgit/refstore/loose"
refpacked "codeberg.org/lindenii/furgit/refstore/packed"
reftable "codeberg.org/lindenii/furgit/refstore/reftable"
)
func openRefStore(root *os.Root, algo objectid.Algorithm) (out refstore.Store, err error) {
hasReftable, err := hasReftableStack(root)
if err != nil {
return nil, err
}
if hasReftable {
reftableRoot, err := root.OpenRoot("reftable")
if err != nil {
return nil, fmt.Errorf("repository: open reftable: %w", err)
}
reftableStore, err := reftable.New(reftableRoot, algo)
if err != nil {
_ = reftableRoot.Close()
return nil, err
}
return reftableStore, nil
}
looseRoot, err := root.OpenRoot(".")
if err != nil {
return nil, fmt.Errorf("repository: open root for loose refs: %w", err)
}
looseStore, err := refloose.New(looseRoot, algo)
if err != nil {
_ = looseRoot.Close()
return nil, err
}
backends := []refstore.Store{looseStore}
_, err = root.Stat("packed-refs")
if err == nil {
packedStore, packedErr := refpacked.New(root, algo)
if packedErr != nil {
_ = looseStore.Close()
return nil, packedErr
}
backends = append(backends, packedStore)
} else if !errors.Is(err, os.ErrNotExist) {
_ = looseStore.Close()
return nil, fmt.Errorf("repository: stat packed-refs: %w", err)
}
return refchain.New(backends...), nil
}
func hasReftableStack(root *os.Root) (bool, error) {
_, err := root.Stat("reftable/tables.list")
if err == nil {
return true, nil
}
if errors.Is(err, os.ErrNotExist) {
return false, nil
}
return false, fmt.Errorf("repository: stat reftable/tables.list: %w", err)
}
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