$ git clone -n https://src.fedoraproject.org/rpms/rust-uu_test.git /var/lib/mock/f41-build-810895-146981/root/chroot_tmpdir/scmroot/rust-uu_test
Cloning into '/var/lib/mock/f41-build-810895-146981/root/chroot_tmpdir/scmroot/rust-uu_test'...
$ git fetch origin 78e695a1a809918e0b83a5f30963cbf1863418ee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uu_test
 * [new ref]         78e695a1a809918e0b83a5f30963cbf1863418ee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 78e695a Rebuild with Rust 1.78 to fix incomplete debuginfo and backtraces