$ git clone -n https://src.fedoraproject.org/rpms/openexr2.git /var/lib/mock/f38-build-side-42-init-devel-1392662-30946/root/chroot_tmpdir/scmroot/openexr2
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1392662-30946/root/chroot_tmpdir/scmroot/openexr2'...
$ git fetch origin 21dcb9edc4cf4f6a525107b9133d463d25b3b9e3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/openexr2
 * [new ref]         21dcb9edc4cf4f6a525107b9133d463d25b3b9e3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 21dcb9e sources