$ git clone -n https://src.fedoraproject.org/rpms/crystal-dock.git /var/lib/mock/f45-build-5745-341/root/chroot_tmpdir/scmroot/crystal-dock
Cloning into '/var/lib/mock/f45-build-5745-341/root/chroot_tmpdir/scmroot/crystal-dock'...
$ git fetch origin 2782bb6e18fd5c8508a7fff9f9636e279920d760:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/crystal-dock
 * [new ref]         2782bb6e18fd5c8508a7fff9f9636e279920d760 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2782bb6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild