$ git clone -n https://src.fedoraproject.org/rpms/rust-arboard.git /var/lib/mock/f45-build-40117-768/root/chroot_tmpdir/scmroot/rust-arboard
Cloning into '/var/lib/mock/f45-build-40117-768/root/chroot_tmpdir/scmroot/rust-arboard'...
$ git fetch origin 81b6982883e5e070aa1d8ffa048a451cffe3c403:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-arboard
 * [new ref]         81b6982883e5e070aa1d8ffa048a451cffe3c403 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 81b6982 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild