$ git clone -n https://src.fedoraproject.org/rpms/mingw-openexr.git /var/lib/mock/f39-build-1462301-33321/root/chroot_tmpdir/scmroot/mingw-openexr
Cloning into '/var/lib/mock/f39-build-1462301-33321/root/chroot_tmpdir/scmroot/mingw-openexr'...
$ git fetch origin 8c2791fc43c12f7f9fa3690d9ecffe78d8c39707:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mingw-openexr
 * [new ref]         8c2791fc43c12f7f9fa3690d9ecffe78d8c39707 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8c2791f Update to 3.1.10