// openSnapFile opens a snap blob returning both a snap.Info completed
// with sideInfo (if not nil) and a corresponding snap.File.
func openSnapFile(snapPath string, unsignedOk bool, sideInfo *snap.SideInfo) (*snap.Info, snap.File, error) {
// TODO: what precautions to take if unsignedOk == false ?
snapf, err := snap.Open(snapPath)
if err != nil {
return nil, nil, err
}
info, err := snapf.Info()
if err != nil {
return nil, nil, err
}
var snapInfo snap.Info
snapInfo = *info
if sideInfo != nil {
snapInfo.SideInfo = *sideInfo
}
return &snapInfo, snapf, nil
}