$ git clone -n https://src.fedoraproject.org/rpms/gtk-doc.git /var/lib/mock/f39-build-1535454-36247/root/chroot_tmpdir/scmroot/gtk-doc
Cloning into '/var/lib/mock/f39-build-1535454-36247/root/chroot_tmpdir/scmroot/gtk-doc'...
$ git fetch origin ab6bf729d864621a08b5c360c7e809603af3979a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gtk-doc
 * [new ref]         ab6bf729d864621a08b5c360c7e809603af3979a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ab6bf72 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild