$ git clone -n https://src.fedoraproject.org/rpms/maturin.git /var/lib/mock/f41-build-side-1-3131120-39608/root/chroot_tmpdir/scmroot/maturin
Cloning into '/var/lib/mock/f41-build-side-1-3131120-39608/root/chroot_tmpdir/scmroot/maturin'...
$ git fetch origin 7cb5be6fc945c00233b1137344a23a0414752a17:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/maturin
 * [new ref]         7cb5be6fc945c00233b1137344a23a0414752a17 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7cb5be6 Update goblin to 0.9