$ git clone -n https://src.fedoraproject.org/rpms/libevent.git /var/lib/mock/f40-build-777770-129511/root/chroot_tmpdir/scmroot/libevent
Cloning into '/var/lib/mock/f40-build-777770-129511/root/chroot_tmpdir/scmroot/libevent'...
$ git fetch origin 90cc61fc41c79f4a437d46bccd139435352383e0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libevent
 * [new ref]         90cc61fc41c79f4a437d46bccd139435352383e0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 90cc61f use autosetup