$ git clone -n https://src.fedoraproject.org/rpms/rust-sval_test.git /var/lib/mock/f41-build-side-1-3134937-39764/root/chroot_tmpdir/scmroot/rust-sval_test
Cloning into '/var/lib/mock/f41-build-side-1-3134937-39764/root/chroot_tmpdir/scmroot/rust-sval_test'...
$ git fetch origin fb3dcfb0f95d1497e943e4e64dced1b19fb7c704:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-sval_test
 * [new ref]         fb3dcfb0f95d1497e943e4e64dced1b19fb7c704 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fb3dcfb no longer needed