$ git clone -n https://src.fedoraproject.org/rpms/regextester.git /var/lib/mock/f45-build-34434-686/root/chroot_tmpdir/scmroot/regextester
Cloning into '/var/lib/mock/f45-build-34434-686/root/chroot_tmpdir/scmroot/regextester'...
$ git fetch origin 29b99c4032c1e6b0f38422b4585908a1df86353c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/regextester
 * [new ref]         29b99c4032c1e6b0f38422b4585908a1df86353c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 29b99c4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild