$ git clone -n https://src.fedoraproject.org/rpms/rust-walkdir.git /var/lib/mock/f45-build-46128-831/root/chroot_tmpdir/scmroot/rust-walkdir
Cloning into '/var/lib/mock/f45-build-46128-831/root/chroot_tmpdir/scmroot/rust-walkdir'...
$ git fetch origin b04173d9dd6c9c0bd3c327409486251c689eead8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-walkdir
 * [new ref]         b04173d9dd6c9c0bd3c327409486251c689eead8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b04173d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild