$ git clone -n https://src.fedoraproject.org/rpms/gnome-shell-extension-argos.git /var/lib/mock/f42-build-side-1-3533487-46362/root/chroot_tmpdir/scmroot/gnome-shell-extension-argos
Cloning into '/var/lib/mock/f42-build-side-1-3533487-46362/root/chroot_tmpdir/scmroot/gnome-shell-extension-argos'...
$ git fetch origin b588f92d250b4503bd46bbfe27b88dc9f3de49e5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-shell-extension-argos
 * [new ref]         b588f92d250b4503bd46bbfe27b88dc9f3de49e5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b588f92 Correct upper version bound