$ git clone -n https://src.fedoraproject.org/rpms/rust-rtoolbox.git /var/lib/mock/f45-build-44512-814/root/chroot_tmpdir/scmroot/rust-rtoolbox
Cloning into '/var/lib/mock/f45-build-44512-814/root/chroot_tmpdir/scmroot/rust-rtoolbox'...
$ git fetch origin 1b9e4b1ef8ac4eaaacf43d772341342630c906ef:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rtoolbox
 * [new ref]         1b9e4b1ef8ac4eaaacf43d772341342630c906ef -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1b9e4b1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild