$ git clone -n https://src.fedoraproject.org/rpms/pyjokes.git /var/lib/mock/f45-build-29162-636/root/chroot_tmpdir/scmroot/pyjokes
Cloning into '/var/lib/mock/f45-build-29162-636/root/chroot_tmpdir/scmroot/pyjokes'...
$ git fetch origin 849ac5bdb3df787417c869d2cf533c16dbc3fa93:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pyjokes
 * [new ref]         849ac5bdb3df787417c869d2cf533c16dbc3fa93 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 849ac5b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild