$ git clone -n https://src.fedoraproject.org/rpms/rust-temp_testdir.git /var/lib/mock/f45-build-45348-822/root/chroot_tmpdir/scmroot/rust-temp_testdir
Cloning into '/var/lib/mock/f45-build-45348-822/root/chroot_tmpdir/scmroot/rust-temp_testdir'...
$ git fetch origin 3d0f963680497389165ed98d4d1ab83bf17dd931:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-temp_testdir
 * [new ref]         3d0f963680497389165ed98d4d1ab83bf17dd931 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3d0f963 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild