$ git clone -n https://src.fedoraproject.org/rpms/extremetuxracer.git /var/lib/mock/f45-build-8797-396/root/chroot_tmpdir/scmroot/extremetuxracer
Cloning into '/var/lib/mock/f45-build-8797-396/root/chroot_tmpdir/scmroot/extremetuxracer'...
$ git fetch origin 2cae8d5a81e10faf23a2a43f2437039b67d354f5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/extremetuxracer
 * [new ref]         2cae8d5a81e10faf23a2a43f2437039b67d354f5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2cae8d5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild