$ git clone -n https://src.fedoraproject.org/rpms/openexr.git /var/lib/mock/f39-build-1677293-40958/root/chroot_tmpdir/scmroot/openexr
Cloning into '/var/lib/mock/f39-build-1677293-40958/root/chroot_tmpdir/scmroot/openexr'...
$ git fetch origin c2153a3c374cbda088c483edf564c90c8a03a556:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/openexr
 * [new ref]         c2153a3c374cbda088c483edf564c90c8a03a556 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c2153a3 Fix build for x86-64-v3