$ git clone -n https://src.fedoraproject.org/rpms/xkeycaps.git /var/lib/mock/f45-build-38900-730/root/chroot_tmpdir/scmroot/xkeycaps
Cloning into '/var/lib/mock/f45-build-38900-730/root/chroot_tmpdir/scmroot/xkeycaps'...
$ git fetch origin e7aa71ff6c2eabc87d2902a003d18168b47eb0bf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xkeycaps
 * [new ref]         e7aa71ff6c2eabc87d2902a003d18168b47eb0bf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e7aa71f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild