$ git clone -n https://src.fedoraproject.org/rpms/timeline.git /var/lib/mock/f45-build-37115-711/root/chroot_tmpdir/scmroot/timeline
Cloning into '/var/lib/mock/f45-build-37115-711/root/chroot_tmpdir/scmroot/timeline'...
$ git fetch origin 3d41d4b6bb47e6b4be663a91b0d9763e4845196b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/timeline
 * [new ref]         3d41d4b6bb47e6b4be663a91b0d9763e4845196b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3d41d4b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild