$ git clone -n https://src.fedoraproject.org/rpms/gnome-online-accounts.git /var/lib/mock/f40-build-2253754-54219/root/chroot_tmpdir/scmroot/gnome-online-accounts
Cloning into '/var/lib/mock/f40-build-2253754-54219/root/chroot_tmpdir/scmroot/gnome-online-accounts'...
$ git fetch origin bc191625f91c606f20ad0edd2083805e8e89a472:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-online-accounts
 * [new ref]         bc191625f91c606f20ad0edd2083805e8e89a472 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bc19162 Bump release