$ git clone -n https://src.fedoraproject.org/rpms/autoconf.git /var/lib/mock/f40-build-2225735-52856/root/chroot_tmpdir/scmroot/autoconf
Cloning into '/var/lib/mock/f40-build-2225735-52856/root/chroot_tmpdir/scmroot/autoconf'...
$ git fetch origin 866c47f6dbe657b6d63611965f97ef56efdc1bf9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/autoconf
 * [new ref]         866c47f6dbe657b6d63611965f97ef56efdc1bf9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 866c47f Add support for autoconf-latest