$ git clone -n https://src.fedoraproject.org/rpms/phrog.git /var/lib/mock/f45-build-39729-751/root/chroot_tmpdir/scmroot/phrog
Cloning into '/var/lib/mock/f45-build-39729-751/root/chroot_tmpdir/scmroot/phrog'...
$ git fetch origin 16d740d357d1297883e8837b125de55db5e888c4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/phrog
 * [new ref]         16d740d357d1297883e8837b125de55db5e888c4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 16d740d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild