$ git clone -n https://src.fedoraproject.org/rpms/rust-duct.git /var/lib/mock/f45-build-41379-782/root/chroot_tmpdir/scmroot/rust-duct
Cloning into '/var/lib/mock/f45-build-41379-782/root/chroot_tmpdir/scmroot/rust-duct'...
$ git fetch origin cd2a742b4ad06f0f5727da6c61022832afa1d331:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-duct
 * [new ref]         cd2a742b4ad06f0f5727da6c61022832afa1d331 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cd2a742 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild