$ git clone -n https://src.fedoraproject.org/rpms/lyx.git /var/lib/mock/f42-build-59176637-6571499/root/chroot_tmpdir/scmroot/lyx
Cloning into '/var/lib/mock/f42-build-59176637-6571499/root/chroot_tmpdir/scmroot/lyx'...
$ git fetch origin 54bb1814757fa24ed14808d2fbdbbfb315108550:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lyx
 * [new ref]         54bb1814757fa24ed14808d2fbdbbfb315108550 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 54bb181 Update to 2.4.3