$ git clone -n https://src.fedoraproject.org/rpms/rust-loop9.git /var/lib/mock/f45-build-43051-799/root/chroot_tmpdir/scmroot/rust-loop9
Cloning into '/var/lib/mock/f45-build-43051-799/root/chroot_tmpdir/scmroot/rust-loop9'...
$ git fetch origin a2b643d05951d01e9aca07b44ddea1c6327c6711:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-loop9
 * [new ref]         a2b643d05951d01e9aca07b44ddea1c6327c6711 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a2b643d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild