Merge pull request #3 from Mic92/ci

.github/workflows/test-flakes.yml

@@ -26,4 +26,8 @@ jobs:
     - name: List flake structure
       run: nix flake show
     - name: Build
-      run: nix build
+      run: nix build --out-link result
+    - name: Run tests
+      run: |
+        nix develop -c install -D ./result/bin/hydra-eval-jobs ./build/src/hydra-eval-jobs
+        nix develop -c pytest ./tests

.gitignore

@@ -42,3 +42,13 @@ tmp/
 /build
 # nix-build
 /result
+
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json

flake.nix

@@ -5,10 +5,19 @@
   inputs.flake-utils.url = "github:numtide/flake-utils";
 
   outputs = { self, nixpkgs, flake-utils }:
-    flake-utils.lib.eachDefaultSystem (system: {
+    flake-utils.lib.eachDefaultSystem (system:
-      packages.hydra-eval-jobs = nixpkgs.legacyPackages.${system}.callPackage ./hydra.nix {
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+      in
+      rec {
+        packages.hydra-eval-jobs = pkgs.callPackage ./hydra.nix {
           srcDir = self;
         };
         defaultPackage = self.packages.${system}.hydra-eval-jobs;
+        devShell = defaultPackage.overrideAttrs (old: {
+          nativeBuildInputs = old.nativeBuildInputs ++ [
+            pkgs.python3.pkgs.pytest
+          ];
+        });
       });
 }

src/hydra-eval-jobs.cc

@@ -25,15 +25,16 @@
 
 using namespace nix;
 
-static Path gcRootsDir;
+typedef enum { evalAuto, evalImpure, evalPure } pureEval;
 
 struct MyArgs : MixEvalArgs, MixCommonArgs
 {
     Path releaseExpr;
+    Path gcRootsDir;
     bool flake = false;
-    bool dryRun = false;
     size_t nrWorkers = 1;
     size_t maxMemorySize = 4096;
+    pureEval evalMode = evalAuto;
 
     MyArgs() : MixCommonArgs("hydra-eval-jobs")
     {
@@ -48,6 +49,15 @@ struct MyArgs : MixEvalArgs, MixCommonArgs
                     }
                     printf("  --%-20s %s\n", name.c_str(), flag->description.c_str());
                 }
+                ::exit(0);
+            }},
+        });
+
+        addFlag({
+            .longName = "impure",
+            .description = "set evaluation mode",
+            .handler = {[&]() {
+                evalMode = evalImpure;
             }},
         });
 
@@ -76,12 +86,6 @@ struct MyArgs : MixEvalArgs, MixCommonArgs
             }}
         });
 
-        addFlag({
-            .longName = "dry-run",
-            .description = "don't create store derivations",
-            .handler = {&dryRun, true}
-        });
-
         addFlag({
             .longName = "flake",
             .description = "build a flake",
@@ -119,11 +123,20 @@ static std::string queryMetaStrings(EvalState & state, DrvInfo & drv, const stri
     return concatStringsSep(", ", res);
 }
 
+static nlohmann::json serializeStorePathSet(StorePathSet &paths, LocalFSStore &store) {
+    auto array = nlohmann::json::array();
+    for (auto & p : paths) {
+        array.push_back(store.printStorePath(p));
+    }
+    return array;
+}
+
 static void worker(
     EvalState & state,
     Bindings & autoArgs,
     AutoCloseFD & to,
-    AutoCloseFD & from)
+    AutoCloseFD & from,
+    const Path &gcRootsDir)
 {
     Value vTop;
 
@@ -233,17 +246,40 @@ static void worker(
                    registers roots for jobs that we may have already
                    done. */
                 auto localStore = state.store.dynamic_pointer_cast<LocalFSStore>();
+                auto storePath = localStore->parseStorePath(drvPath);
                 if (gcRootsDir != "" && localStore) {
                     Path root = gcRootsDir + "/" + std::string(baseNameOf(drvPath));
                     if (!pathExists(root))
-                        localStore->addPermRoot(localStore->parseStorePath(drvPath), root);
+                        localStore->addPermRoot(storePath, root);
                 }
 
+                uint64_t downloadSize, narSize;
+                StorePathSet willBuild, willSubstitute, unknown;
+                std::vector<nix::StorePathWithOutputs> paths;
+                StringSet outputNames;
+
+                for (auto & output : outputs) {
+                    outputNames.insert(output.first);
+                }
+                paths.push_back({storePath, outputNames});
+
+                localStore->queryMissing(paths,
+                                         willBuild,
+                                         willSubstitute,
+                                         unknown,
+                                         downloadSize,
+                                         narSize);
+
                 nlohmann::json out;
-                for (auto & j : outputs)
+                for (auto & p : outputs) {
-                    out[j.first] = j.second;
+                    out[p.first] = p.second;
+                }
                 job["outputs"] = std::move(out);
 
+                job["builds"] = serializeStorePathSet(willBuild, *localStore);
+                job["substitutes"] = serializeStorePathSet(willSubstitute, *localStore);
+                job["unknown"] = serializeStorePathSet(unknown, *localStore);
+
                 reply["job"] = std::move(job);
             }
 
@@ -309,13 +345,11 @@ int main(int argc, char * * argv)
 
         /* When building a flake, use pure evaluation (no access to
            'getEnv', 'currentSystem' etc. */
-        evalSettings.pureEval = myArgs.flake;
+        evalSettings.pureEval = myArgs.evalMode == evalAuto ? myArgs.flake : myArgs.evalMode == evalPure;
-
-        if (myArgs.dryRun) settings.readOnlyMode = true;
 
         if (myArgs.releaseExpr == "") throw UsageError("no expression specified");
 
-        if (gcRootsDir == "") printMsg(lvlError, "warning: `--gc-roots-dir' not specified");
+        if (myArgs.gcRootsDir == "") printMsg(lvlError, "warning: `--gc-roots-dir' not specified");
 
         struct State
         {
@@ -352,7 +386,7 @@ int main(int argc, char * * argv)
                                 try {
                                     EvalState state(myArgs.searchPath, openStore());
                                     Bindings & autoArgs = *myArgs.getAutoArgs(state);
-                                    worker(state, autoArgs, *to, *from);
+                                    worker(state, autoArgs, *to, *from, myArgs.gcRootsDir);
                                 } catch (Error & e) {
                                     nlohmann::json err;
                                     auto msg = e.msg();
@@ -466,15 +500,6 @@ int main(int argc, char * * argv)
             auto named = job.find("namedConstituents");
             if (named == job.end()) continue;
 
-            if (myArgs.dryRun) {
-                for (std::string jobName2 : *named) {
-                    auto job2 = state->jobs.find(jobName2);
-                    if (job2 == state->jobs.end())
-                        throw Error("aggregate job '%s' references non-existent job '%s'", jobName, jobName2);
-                    std::string drvPath2 = (*job2)["drvPath"];
-                    job["constituents"].push_back(drvPath2);
-                }
-            } else {
             auto drvPath = store->parseStorePath((std::string) job["drvPath"]);
             auto drv = store->readDerivation(drvPath);
 
@@ -501,7 +526,6 @@ int main(int argc, char * * argv)
 
             job["drvPath"] = newDrvPath;
             job["outputs"]["out"] = store->printStorePath(outPath);
-            }
 
             job.erase("namedConstituents");
         }

tests/assets/ci.nix

@@ -0,0 +1,7 @@
+let
+  pkgs = import (builtins.getFlake (toString ./.)).inputs.nixpkgs {};
+in
+{
+  builtJob = pkgs.writeText "job1" "job1";
+  substitutedJob = pkgs.hello;
+}

tests/assets/flake.lock

@@ -0,0 +1,26 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1616345250,
+        "narHash": "sha256-WLbLFIJyKCklGyEMGwh9XDTzafafyO95s4+rJHOc/Ag=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "5e4a4e0c32f0ca0a5bd4ebbbf17aedd347de7f3e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

tests/assets/flake.nix

@@ -0,0 +1,12 @@
+{
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs";
+
+  outputs = { self, nixpkgs }: let
+    pkgs = nixpkgs.legacyPackages.x86_64-linux;
+  in {
+    hydraJobs = {
+      builtJob = pkgs.writeText "job1" "job1";
+      substitutedJob = pkgs.hello;
+    };
+  };
+}

tests/test_eval.py

@@ -0,0 +1,34 @@
+#!/usr/bin/env python3
+
+import subprocess
+import json
+from tempfile import TemporaryDirectory
+from pathlib import Path
+from typing import List
+
+TEST_ROOT = Path(__file__).parent.resolve()
+PROJECT_ROOT = TEST_ROOT.parent
+BIN = PROJECT_ROOT.joinpath("build", "src", "hydra-eval-jobs")
+
+
+def common_test(extra_args: List[str]) -> None:
+    with TemporaryDirectory() as tempdir:
+        cmd = [str(BIN), "--gc-roots-dir", tempdir] + extra_args
+        res = subprocess.run(
+            cmd,
+            cwd=TEST_ROOT.joinpath("assets"),
+            text=True,
+            check=True,
+            stdout=subprocess.PIPE,
+        )
+        data = json.loads(res.stdout)
+        assert len(data["builtJob"]["builds"]) == 1
+        assert len(data["substitutedJob"]["substitutes"]) >= 1
+
+
+def test_flake() -> None:
+    common_test(["--flake", ".#"])
+
+
+def test_expression() -> None:
+    common_test(["ci.nix"])