s6-rc-round-robin

runs services in order, starting the next one when the previous one
dies or fails to start

pkgs/s6-rc-round-robin/default.nix

@@ -0,0 +1,21 @@
+{
+  lualinux,
+  writeFennel,
+  anoia,
+  linotify,
+  fennel,
+  stdenv,
+  s6-rc-up-tree,
+}:
+stdenv.mkDerivation {
+  name = "s6-rc-round-robin";
+  src = ./.;
+  propagatedBuildInputs = [ s6-rc-up-tree ];
+  installPhase = ''
+    mkdir -p $out/bin
+    cp -p ${writeFennel "uevent-watch" {
+      packages = [fennel anoia linotify lualinux s6-rc-up-tree] ;
+      mainFunction = "run";
+    } ./robin.fnl} $out/bin/s6-rc-round-robin
+  '';
+}