$ git clone -n https://src.fedoraproject.org/rpms/gnome-online-accounts.git /var/lib/mock/f40-build-2218175-52593/root/chroot_tmpdir/scmroot/gnome-online-accounts
Cloning into '/var/lib/mock/f40-build-2218175-52593/root/chroot_tmpdir/scmroot/gnome-online-accounts'...
$ git fetch origin 4ce2abaf4e499234a60128d7d93be591be8b2a39:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-online-accounts
 * [new ref]         4ce2abaf4e499234a60128d7d93be591be8b2a39 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4ce2aba Fix build with libxml2 2.12