$ git clone -n https://src.fedoraproject.org/rpms/rust-bigdecimal.git /var/lib/mock/f45-build-40445-772/root/chroot_tmpdir/scmroot/rust-bigdecimal
Cloning into '/var/lib/mock/f45-build-40445-772/root/chroot_tmpdir/scmroot/rust-bigdecimal'...
$ git fetch origin cd82ff5992f6dd5616d5b2baab40f44aebe4df71:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-bigdecimal
 * [new ref]         cd82ff5992f6dd5616d5b2baab40f44aebe4df71 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cd82ff5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild