$ git clone -n https://src.fedoraproject.org/rpms/openjpeg2.git /var/lib/mock/f41-build-side-1-2673872-29259/root/chroot_tmpdir/scmroot/openjpeg2
Cloning into '/var/lib/mock/f41-build-side-1-2673872-29259/root/chroot_tmpdir/scmroot/openjpeg2'...
$ git fetch origin c367b1c0b600bc387ca7bdf4eccda7f121360979:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/openjpeg2
 * [new ref]         c367b1c0b600bc387ca7bdf4eccda7f121360979 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c367b1c Moved to openjpeg