$ git clone -n https://src.fedoraproject.org/rpms/rust2rpm-helper.git /var/lib/mock/f38-build-side-42-init-devel-1411921-31434/root/chroot_tmpdir/scmroot/rust2rpm-helper
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1411921-31434/root/chroot_tmpdir/scmroot/rust2rpm-helper'...
$ git fetch origin 97f52172e38a15adfe00833d5bf04d240f4e65a4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust2rpm-helper
 * [new ref]         97f52172e38a15adfe00833d5bf04d240f4e65a4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 97f5217 Initial import (#2242017)