$ git clone -n https://src.fedoraproject.org/rpms/lsb_release.git /var/lib/mock/f39-build-1966868-43295/root/chroot_tmpdir/scmroot/lsb_release
Cloning into '/var/lib/mock/f39-build-1966868-43295/root/chroot_tmpdir/scmroot/lsb_release'...
$ git fetch origin 1b12e8f04fd6aea447664d133ef964ba32305934:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lsb_release
 * [new ref]         1b12e8f04fd6aea447664d133ef964ba32305934 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1b12e8f Update to 3.3