$ git clone -n https://src.fedoraproject.org/rpms/rust-twofish.git /var/lib/mock/f45-build-45821-828/root/chroot_tmpdir/scmroot/rust-twofish
Cloning into '/var/lib/mock/f45-build-45821-828/root/chroot_tmpdir/scmroot/rust-twofish'...
$ git fetch origin 7975b96cadcc4684dc9858da5db7279e5055a21c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-twofish
 * [new ref]         7975b96cadcc4684dc9858da5db7279e5055a21c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7975b96 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild