$ git clone -n https://src.fedoraproject.org/rpms/rust-below-common.git /var/lib/mock/f39-build-1658307-40580/root/chroot_tmpdir/scmroot/rust-below-common
Cloning into '/var/lib/mock/f39-build-1658307-40580/root/chroot_tmpdir/scmroot/rust-below-common'...
$ git fetch origin bf122505b0db7504dc7228e9ce65af03043213e9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-below-common
 * [new ref]         bf122505b0db7504dc7228e9ce65af03043213e9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bf12250 Update to 0.7.1