$ git clone -n https://src.fedoraproject.org/rpms/rust-spin_sleep.git /var/lib/mock/f45-build-45113-821/root/chroot_tmpdir/scmroot/rust-spin_sleep
Cloning into '/var/lib/mock/f45-build-45113-821/root/chroot_tmpdir/scmroot/rust-spin_sleep'...
$ git fetch origin 472a89f4e051b28d135cbe2a6879f29095d76f37:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-spin_sleep
 * [new ref]         472a89f4e051b28d135cbe2a6879f29095d76f37 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 472a89f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild