$ git clone -n https://src.fedoraproject.org/rpms/maturin.git /var/lib/mock/f40-build-2010178-45567/root/chroot_tmpdir/scmroot/maturin
Cloning into '/var/lib/mock/f40-build-2010178-45567/root/chroot_tmpdir/scmroot/maturin'...
$ git fetch origin 761375359d3299fed1d50417c4cdc85b30c79e3e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/maturin
 * [new ref]         761375359d3299fed1d50417c4cdc85b30c79e3e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7613753 Update to version 1.4.0; Fixes RHBZ#2252654