$ git clone -n https://src.fedoraproject.org/rpms/gnome-online-accounts.git /var/lib/mock/f40-build-2226712-52941/root/chroot_tmpdir/scmroot/gnome-online-accounts
Cloning into '/var/lib/mock/f40-build-2226712-52941/root/chroot_tmpdir/scmroot/gnome-online-accounts'...
$ git fetch origin 84f3553dfda61ab4cf5ca842eec7243a83b49151:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-online-accounts
 * [new ref]         84f3553dfda61ab4cf5ca842eec7243a83b49151 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 84f3553 3.49.0