$ git clone -n https://src.fedoraproject.org/rpms/libnotify.git /var/lib/mock/f39-build-1591968-38305/root/chroot_tmpdir/scmroot/libnotify
Cloning into '/var/lib/mock/f39-build-1591968-38305/root/chroot_tmpdir/scmroot/libnotify'...
$ git fetch origin bdd86642f3397b36a8c4002e30efde7f11b4f06f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libnotify
 * [new ref]         bdd86642f3397b36a8c4002e30efde7f11b4f06f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bdd8664 Update to 0.8.3