$ git clone -n https://src.fedoraproject.org/rpms/rust-mcf.git /var/lib/mock/f45-build-43161-800/root/chroot_tmpdir/scmroot/rust-mcf
Cloning into '/var/lib/mock/f45-build-43161-800/root/chroot_tmpdir/scmroot/rust-mcf'...
$ git fetch origin f710f030b9e115602ecb569523f60037230c2a81:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-mcf
 * [new ref]         f710f030b9e115602ecb569523f60037230c2a81 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f710f03 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild