$ git clone -n https://src.fedoraproject.org/rpms/rust-interim.git /var/lib/mock/f45-build-42587-795/root/chroot_tmpdir/scmroot/rust-interim
Cloning into '/var/lib/mock/f45-build-42587-795/root/chroot_tmpdir/scmroot/rust-interim'...
$ git fetch origin 238e0ec7d126762ae8715b053e3a41a652e9cca6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-interim
 * [new ref]         238e0ec7d126762ae8715b053e3a41a652e9cca6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 238e0ec Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild