Queue-runner: Always produce a machines JSON object

Even if there are no machines, there should at least be an empty object.

hydra/jobsets.nix

@@ -0,0 +1,90 @@
+{ pulls, branches, ... }:
+let
+  # create the json spec for the jobset
+  makeSpec =
+    contents:
+    builtins.derivation {
+      name = "spec.json";
+      system = "x86_64-linux";
+      preferLocalBuild = true;
+      allowSubstitutes = false;
+      builder = "/bin/sh";
+      args = [
+        (builtins.toFile "builder.sh" ''
+          echo "$contents" > $out
+        '')
+      ];
+      contents = builtins.toJSON contents;
+    };
+
+  prs = readJSONFile pulls;
+  refs = readJSONFile branches;
+
+  # template for creating a job
+  makeJob =
+    {
+      schedulingshares ? 10,
+      keepnr ? 3,
+      description,
+      flake,
+      enabled ? 1,
+    }:
+    {
+      inherit
+        description
+        flake
+        schedulingshares
+        keepnr
+        enabled
+        ;
+      type = 1;
+      hidden = false;
+      checkinterval = 300; # every 5 minutes
+      enableemail = false;
+      emailoverride = "";
+    };
+
+  giteaHost = "ssh://gitea@nayeonie.com:2222";
+  repo = "ahuston-0/hydra";
+  # # Create a hydra job for a branch
+  jobOfRef =
+    name:
+    { ref, ... }:
+    if ((builtins.match "^refs/heads/(.*)$" ref) == null) then
+      null
+    else
+      {
+        name = builtins.replaceStrings [ "/" ] [ "-" ] "branch-${name}";
+        value = makeJob {
+          description = "Branch ${name}";
+          flake = "git+${giteaHost}/${repo}?ref=${ref}";
+        };
+      };
+
+  # Create a hydra job for a PR
+  jobOfPR = id: info: {
+    name = if info.draft then "draft-${id}" else "pr-${id}";
+    value = makeJob {
+      description = "PR ${id}: ${info.title}";
+      flake = "git+${giteaHost}/${repo}?ref=${info.head.ref}";
+      enabled = info.state == "open";
+    };
+  };
+
+  # some utility functions
+  # converts json to name/value dicts
+  attrsToList = l: builtins.attrValues (builtins.mapAttrs (name: value: { inherit name value; }) l);
+  # wrapper function for reading json from file
+  readJSONFile = f: builtins.fromJSON (builtins.readFile f);
+  # remove null values from a set, in-case of branches that don't exist
+  mapFilter = f: l: builtins.filter (x: (x != null)) (map f l);
+
+  # Create job set from PRs and branches
+  jobs = makeSpec (
+    builtins.listToAttrs (map ({ name, value }: jobOfPR name value) (attrsToList prs))
+    // builtins.listToAttrs (mapFilter ({ name, value }: jobOfRef name value) (attrsToList refs))
+  );
+in
+{
+  jobsets = jobs;
+}

hydra/spec.json

@@ -0,0 +1,35 @@
+{
+  "enabled": 1,
+  "hidden": false,
+  "description": "ahuston-0's fork of hydra",
+  "nixexprinput": "nixexpr",
+  "nixexprpath": "hydra/jobsets.nix",
+  "checkinterval": 60,
+  "schedulingshares": 100,
+  "enableemail": false,
+  "emailoverride": "",
+  "keepnr": 3,
+  "type": 0,
+  "inputs": {
+    "nixexpr": {
+      "value": "ssh://gitea@nayeonie.com:2222/ahuston-0/hydra.git add-gitea-pulls",
+      "type": "git",
+      "emailresponsible": false
+    },
+    "nixpkgs": {
+      "value": "https://github.com/NixOS/nixpkgs nixos-unstable",
+      "type": "git",
+      "emailresponsible": false
+    },
+    "pulls": {
+      "type": "giteapulls",
+      "value": "nayeonie.com ahuston-0 hydra https",
+      "emailresponsible": false
+    },
+    "branches": {
+      "type": "gitea_refs",
+      "value": "nayeonie.com ahuston-0 hydra heads https -",
+      "emailresponsible": false
+    }
+  }
+}