Reimplement (named) constituent jobs (+globbing) based on nix-eval-jobs

Depends on https://github.com/nix-community/nix-eval-jobs/pull/349 & #1421.

Almost equivalent to #1425, but with a small change: when having e.g. an
aggregate job with a glob that matches nothing, the jobset evaluation is
failed now. This was the intended behavior before (hydra-eval-jobset
fails hard if an aggregate is broken), the code-path was never reached
however since the aggregate was never marked as broken in this case
before.

t/jobs/config.nix

@@ -0,0 +1,14 @@
+rec {
+  path = "/nix/store/l9mg93sgx50y88p5rr6x1vib6j1rjsds-coreutils-9.1/bin";
+
+  mkDerivation = args:
+    derivation ({
+      system = builtins.currentSystem;
+      PATH = path;
+    } // args);
+  mkContentAddressedDerivation = args: mkDerivation ({
+    __contentAddressed = true;
+    outputHashMode = "recursive";
+    outputHashAlgo = "sha256";
+  } // args);
+}

t/jobs/constituents-cycle-glob.nix

@@ -0,0 +1,34 @@
+with import ./config.nix;
+{
+  packages.constituentA = mkDerivation {
+    name = "empty-dir-A";
+    builder = ./empty-dir-builder.sh;
+    _hydraAggregate = true;
+    _hydraGlobConstituents = true;
+    constituents = [ "*_aggregate" ];
+  };
+
+  packages.constituentB = mkDerivation {
+    name = "empty-dir-B";
+    builder = ./empty-dir-builder.sh;
+  };
+
+  ok_aggregate = mkDerivation {
+    name = "direct_aggregate";
+    _hydraAggregate = true;
+    _hydraGlobConstituents = true;
+    constituents = [
+      "packages.*"
+    ];
+    builder = ./empty-dir-builder.sh;
+  };
+
+  indirect_aggregate = mkDerivation {
+    name = "indirect_aggregate";
+    _hydraAggregate = true;
+    constituents = [
+      "ok_aggregate"
+    ];
+    builder = ./empty-dir-builder.sh;
+  };
+}

t/jobs/constituents-cycle.nix

@@ -0,0 +1,21 @@
+with import ./config.nix;
+{
+  ok_aggregate = mkDerivation {
+    name = "direct_aggregate";
+    _hydraAggregate = true;
+    _hydraGlobConstituents = true;
+    constituents = [
+      "indirect_aggregate"
+    ];
+    builder = ./empty-dir-builder.sh;
+  };
+
+  indirect_aggregate = mkDerivation {
+    name = "indirect_aggregate";
+    _hydraAggregate = true;
+    constituents = [
+      "ok_aggregate"
+    ];
+    builder = ./empty-dir-builder.sh;
+  };
+}

t/jobs/constituents-glob-all.nix

@@ -0,0 +1,22 @@
+with import ./config.nix;
+{
+  packages.constituentA = mkDerivation {
+    name = "empty-dir-A";
+    builder = ./empty-dir-builder.sh;
+  };
+
+  packages.constituentB = mkDerivation {
+    name = "empty-dir-B";
+    builder = ./empty-dir-builder.sh;
+  };
+
+  ok_aggregate = mkDerivation {
+    name = "direct_aggregate";
+    _hydraAggregate = true;
+    _hydraGlobConstituents = true;
+    constituents = [
+      "*"
+    ];
+    builder = ./empty-dir-builder.sh;
+  };
+}

t/jobs/constituents-glob.nix

@@ -0,0 +1,31 @@
+with import ./config.nix;
+{
+  packages.constituentA = mkDerivation {
+    name = "empty-dir-A";
+    builder = ./empty-dir-builder.sh;
+  };
+
+  packages.constituentB = mkDerivation {
+    name = "empty-dir-B";
+    builder = ./empty-dir-builder.sh;
+  };
+
+  ok_aggregate = mkDerivation {
+    name = "direct_aggregate";
+    _hydraAggregate = true;
+    _hydraGlobConstituents = true;
+    constituents = [
+      "packages.*"
+    ];
+    builder = ./empty-dir-builder.sh;
+  };
+
+  indirect_aggregate = mkDerivation {
+    name = "indirect_aggregate";
+    _hydraAggregate = true;
+    constituents = [
+      "ok_aggregate"
+    ];
+    builder = ./empty-dir-builder.sh;
+  };
+}

t/jobs/constituents-no-matches.nix

@@ -0,0 +1,20 @@
+with import ./config.nix;
+{
+  non_match_aggregate = mkDerivation {
+    name = "mixed_aggregate";
+    _hydraAggregate = true;
+    _hydraGlobConstituents = true;
+    constituents = [
+      "tests.*"
+    ];
+    builder = ./empty-dir-builder.sh;
+  };
+
+  # Without a second job no jobset is attempted to be created
+  # (the only job would be broken)
+  # and thus the constituent validation is never reached.
+  dummy = mkDerivation {
+    name = "dummy";
+    builder = ./empty-dir-builder.sh;
+  };
+}

t/jobs/declarative/project.json

@@ -0,0 +1,24 @@
+{
+    "enabled": 1,
+    "hidden": false,
+    "description": "declarative-jobset-example",
+    "nixexprinput": "src",
+    "nixexprpath": "declarative/generator.nix",
+    "checkinterval": 300,
+    "schedulingshares": 100,
+    "enableemail": false,
+    "emailoverride": "",
+    "keepnr": 3,
+    "inputs": {
+        "src": {
+            "type": "path",
+            "value": "/home/ma27/Projects/hydra-cppnix/t/jobs",
+            "emailresponsible": false
+        },
+        "jobspath": {
+            "type": "string",
+            "value": "/home/ma27/Projects/hydra-cppnix/t/jobs",
+            "emailresponsible": false
+        }
+    }
+}