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package fetch
import (
giterrors "codeberg.org/lindenii/furgit/errors"
objectid "codeberg.org/lindenii/furgit/object/id"
objecttype "codeberg.org/lindenii/furgit/object/type"
)
// PeelToBlobID peels tags until it reaches a blob object ID.
func (r *Fetcher) PeelToBlobID(id objectid.ObjectID) (objectid.ObjectID, error) {
for {
ty, _, err := r.Header(id)
if err != nil {
return objectid.ObjectID{}, err
}
switch ty {
case objecttype.TypeBlob:
return id, nil
case objecttype.TypeTag:
tag, err := r.ExactTag(id)
if err != nil {
return objectid.ObjectID{}, err
}
id = tag.Object().Target
case objecttype.TypeInvalid,
objecttype.TypeCommit,
objecttype.TypeTree,
objecttype.TypeFuture,
objecttype.TypeOfsDelta,
objecttype.TypeRefDelta:
return objectid.ObjectID{}, &giterrors.ObjectTypeError{OID: id, Got: ty, Want: objecttype.TypeBlob}
default:
return objectid.ObjectID{}, &giterrors.ObjectTypeError{OID: id, Got: ty, Want: objecttype.TypeBlob}
}
}
}
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