$ git clone -n https://src.fedoraproject.org/rpms/qjackctl.git /var/lib/mock/f45-build-33913-675/root/chroot_tmpdir/scmroot/qjackctl
Cloning into '/var/lib/mock/f45-build-33913-675/root/chroot_tmpdir/scmroot/qjackctl'...
$ git fetch origin cdc153998e1e82ef641bcf4b1ccfc50b4fc35e6d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qjackctl
 * [new ref]         cdc153998e1e82ef641bcf4b1ccfc50b4fc35e6d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cdc1539 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild