$ git clone -n https://src.fedoraproject.org/rpms/radiotray-ng.git /var/lib/mock/f45-build-34275-683/root/chroot_tmpdir/scmroot/radiotray-ng
Cloning into '/var/lib/mock/f45-build-34275-683/root/chroot_tmpdir/scmroot/radiotray-ng'...
$ git fetch origin 1b0644f3274830f5d1c3e19699422808578fd1c3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/radiotray-ng
 * [new ref]         1b0644f3274830f5d1c3e19699422808578fd1c3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1b0644f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild