$ git clone -n https://src.fedoraproject.org/rpms/gnome-online-accounts.git /var/lib/mock/f40-build-2696194-69581/root/chroot_tmpdir/scmroot/gnome-online-accounts
Cloning into '/var/lib/mock/f40-build-2696194-69581/root/chroot_tmpdir/scmroot/gnome-online-accounts'...
$ git fetch origin 8291a2b846411975abdce799fd452eef0894589f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-online-accounts
 * [new ref]         8291a2b846411975abdce799fd452eef0894589f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8291a2b Fix flatpak build