From 17768c9a02310eb586a4620132a4464990ffdee5 Mon Sep 17 00:00:00 2001
From: Ryan Trinkle <ryan.trinkle@gmail.com>
Date: Sat, 17 Nov 2018 18:43:22 -0500
Subject: [PATCH] Add jobsets.nix

---
 jobsets.nix | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 jobsets.nix

diff --git a/jobsets.nix b/jobsets.nix
new file mode 100644
index 0000000..9d8bf16
--- /dev/null
+++ b/jobsets.nix
@@ -0,0 +1,66 @@
+{ prs }:
+
+let
+  self = import ./. {};
+  pkgs = self.nixpkgs;
+  mkFetchGithub = value: {
+    inherit value;
+    type = "git";
+    emailresponsible = false;
+  };
+in
+with pkgs.lib;
+let
+  defaults = jobs: {
+    inherit (jobs) description;
+    enabled = 1;
+    hidden = false;
+    keepnr = 10;
+    schedulingshares = 100;
+    checkinterval = 120;
+    enableemail = false;
+    emailoverride = "";
+    nixexprinput = "hnix";
+    nixexprpath = "release.nix";
+    inputs = jobs.inputs // {
+      nixpkgs = {
+        type = "git";
+        value = "https://github.com/NixOS/nixpkgs-channels nixos-unstable";
+        emailresponsible = false;
+      };
+    };
+  };
+  branchJobset = branch: defaults {
+    description = "hnix-${branch}";
+    inputs = {
+      hnix = {
+        value = "https://github.com/haskell-nix/hnix ${branch}";
+        type = "git";
+        emailresponsible = false;
+      };
+    };
+  };
+  makePr = num: info: {
+    name = "hnix-pr-${num}";
+    value = defaults {
+      description = "#${num}: ${info.title}";
+      inputs = {
+        hnix = {
+          #NOTE: This should really use "pull/${num}/merge"; however, GitHub's
+          #status checks only operate on PR heads.  This creates a race
+          #condition, which can currently only be solved by requiring PRs to be
+          #up to date before they're merged.  See
+          #https://github.com/isaacs/github/issues/1002
+          value = "https://github.com/haskell-nix/hnix pull/${num}/head 1";
+          type = "git";
+          emailresponsible = false;
+        };
+      };
+    };
+  };
+  processedPrs = mapAttrs' makePr (builtins.fromJSON (builtins.readFile prs));
+  jobsetsAttrs = processedPrs //
+    genAttrs ["master"] branchJobset;
+in {
+  jobsets = pkgs.writeText "spec.json" (builtins.toJSON jobsetsAttrs);
+}