$ git clone -n https://src.fedoraproject.org/rpms/zenity.git /var/lib/mock/f42-build-3305431-41426/root/chroot_tmpdir/scmroot/zenity
Cloning into '/var/lib/mock/f42-build-3305431-41426/root/chroot_tmpdir/scmroot/zenity'...
$ git fetch origin 8cdf20895b6c1b4f4344e0b922084fa56b034193:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/zenity
 * [new ref]         8cdf20895b6c1b4f4344e0b922084fa56b034193 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8cdf208 BuildRequires: mesa-libEGL