overlays: add underpinnings for a pr tracking mechanism

lib/default.nix

@@ -1,5 +1,12 @@
 { lib, ... }:
 let
+  prStatus = builtins.fromJSON (builtins.readFile ../pr_status.json);
+  prIsOpen = pr: overlay:
+    if prStatus."${builtins.toString pr}".status == "open" then
+      overlay
+    else
+      null;
+
   mkCronScript = name: src: ''
     . /etc/profile;
     set -x
@@ -31,6 +38,7 @@ let
         deadnix
         git
         git-bug
+        jo
         jq
         nil
         nix-diff
@@ -54,7 +62,7 @@ let
     };
 
   xinlib = {
-    inherit buildVer mkCronScript jobToUserService jobToService buildShell;
+    inherit buildVer mkCronScript jobToUserService jobToService buildShell prStatus prIsOpen;
   };
 
 in xinlib

overlays/default.nix

@@ -1,8 +1,9 @@
-{ isUnstable, lib, ... }:
+{ isUnstable, lib, xinlib, ... }:
 let
   openssh = import ./openssh.nix;
-  tailscale = import ./tailscale.nix;
-
+  tailscale = xinlib.prIsOpen 231281 (import ./tailscale.nix);
+  jetbrains = xinlib.prIsOpen 232308 (import ./jetbrains.nix);
+  tidal-hifi = xinlib.prIsOpen 228552 (import ./tidal-hifi.nix { inherit lib; });
 in {
   nixpkgs.overlays = if isUnstable then [
     (_: super: {
@@ -12,8 +13,8 @@ in {
         });
       };
     })
-    (import ./jetbrains.nix)
-    (import ./tidal-hifi.nix { inherit lib; })
+    jetbrains
+    tidal-hifi
     openssh
     tailscale
   ] else [

pr_status.json

@@ -1 +1,17 @@
-{"232308":{"status":"open","link":"https://github.com/NixOS/nixpkgs/pull/232308"}}
+{
+  "232308": {
+    "status": "open",
+    "target": "unstable",
+    "link": "https://github.com/NixOS/nixpkgs/pull/232308"
+  },
+  "228552": {
+    "status": "open",
+    "target": "unstable",
+    "link": "https://github.com/NixOS/nixpkgs/pull/228552"
+  },
+  "231281": {
+    "status": "open",
+    "target": "stable",
+    "link": "https://github.com/NixOS/nixpkgs/pull/231281"
+  }
+}