$ git clone -n https://src.fedoraproject.org/rpms/rust-rbspy-testdata /var/lib/mock/f42-build-3453405-45488/root/chroot_tmpdir/scmroot/rust-rbspy-testdata
Cloning into '/var/lib/mock/f42-build-3453405-45488/root/chroot_tmpdir/scmroot/rust-rbspy-testdata'...
$ git fetch origin 3db7865a3a6ed26768059e1291367c7a3df4cb78:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rbspy-testdata
 * [new ref]         3db7865a3a6ed26768059e1291367c7a3df4cb78 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3db7865 Update to version 0.2.2; Fixes RHBZ#2322877