message: include file name in error messages
diff: @@ -92,13 +92,17 @@ impl PoolService {
  // and copying permissions can be problem for some cases
  let mut gt_fin = fs::File::open(&pool_config.genesis_txn)
  - .to_indy(IndyErrorKind::IOError, "Can't copy genesis txn file")?;
  + .to_indy(IndyErrorKind::IOError,
  + format!("Can't open genesis txn file {:?}", &pool_config.genesis_txn))?;
  let mut gt_fout = fs::File::create(path.as_path())
  - .to_indy(IndyErrorKind::IOError, "Can't copy genesis txn file")?;
  + .to_indy(IndyErrorKind::IOError,
  + format!("Can't create genesis txn file {:?}", path.as_path()))?;
  io::copy(&mut gt_fin, &mut gt_fout)
  - .to_indy(IndyErrorKind::IOError, "Can't copy genesis txn file")?;
  + .to_indy(IndyErrorKind::IOError,
  + format!("Can't copy genesis txn file from {:?} to {:?}",
  + &pool_config.genesis_txn, path.as_path()))?;
  }
  path.pop();
  