$ git clone -n https://src.fedoraproject.org/rpms/texlive-base.git /var/lib/mock/f40-build-2648310-66765/root/chroot_tmpdir/scmroot/texlive-base
Cloning into '/var/lib/mock/f40-build-2648310-66765/root/chroot_tmpdir/scmroot/texlive-base'...
$ git fetch origin cfd7ebae20528f8e195a61ab9b5976abae4b7d0c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/texlive-base
 * [new ref]         cfd7ebae20528f8e195a61ab9b5976abae4b7d0c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cfd7eba fix bz#2269661, FTBFS due to libXaw 1.0.16