$ git clone -n https://src.fedoraproject.org/rpms/catch.git /var/lib/mock/f40-build-2208895-52147/root/chroot_tmpdir/scmroot/catch
Cloning into '/var/lib/mock/f40-build-2208895-52147/root/chroot_tmpdir/scmroot/catch'...
$ git fetch origin 9088b16f3efb8ecd31d19a4719172c2540dd1c77:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/catch
 * [new ref]         9088b16f3efb8ecd31d19a4719172c2540dd1c77 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9088b16 Update to 3.5.1 upstream release