$ git clone -n https://src.fedoraproject.org/rpms/rust-md4.git /var/lib/mock/f45-build-43164-800/root/chroot_tmpdir/scmroot/rust-md4
Cloning into '/var/lib/mock/f45-build-43164-800/root/chroot_tmpdir/scmroot/rust-md4'...
$ git fetch origin a044b0e70bf78ee883c082dca070b2c1d21f8f17:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-md4
 * [new ref]         a044b0e70bf78ee883c082dca070b2c1d21f8f17 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a044b0e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild