test(3p/nix): Partially enable evaluator success tests r/1397

Enables the `eval-okay-` test suite, with some caveats:

* The output is not yet checked against the expected value, so the
  tests only check that pure evaluation succeeds
* A handful of tests have been disabled as they are causing failures
  that may be related to the DummyStore implementation.

Both of these will be addressed in followup commits, but there is
already some value in having the pure evaluation tests pass.

Change-Id: I62236c95ebffb06dc64a45455a8ee04344c400b7
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1284
Tested-by: BuildkiteCI
Reviewed-by: isomer <isomer@tvl.fyi>
Reviewed-by: glittershark <grfn@gws.fyi>

6 files changed, 58 insertions, 0 deletions

diff --git a/third_party/nix/src/tests/lang/disabled/README.txt b/third_party/nix/src/tests/lang/disabled/README.txt
new file mode 100644
index 000000000000..3dbcbf4f0dd9
--- /dev/null
+++ b/third_party/nix/src/tests/lang/disabled/README.txt
@@ -0,0 +1,7 @@
+These tests are disabeld primarily because the DummyStore used for
+tests does not interact with real files on disk at the moment, but the
+tests expect it to.
+
+Once we have a solution for this (potentially just reading & hashing
+the files, but not writing them anywhere) these tests will be enabled
+again.
diff --git a/third_party/nix/src/tests/lang/disabled/eval-okay-context-introspection.nix b/third_party/nix/src/tests/lang/disabled/eval-okay-context-introspection.nix
new file mode 100644
index 000000000000..43178bd2eef9
--- /dev/null
+++ b/third_party/nix/src/tests/lang/disabled/eval-okay-context-introspection.nix
@@ -0,0 +1,24 @@
+let
+  drv = derivation {
+    name = "fail";
+    builder = "/bin/false";
+    system = "x86_64-linux";
+    outputs = [ "out" "foo" ];
+  };
+
+  path = "${./eval-okay-context-introspection.nix}";
+
+  desired-context = {
+    "${builtins.unsafeDiscardStringContext path}" = {
+      path = true;
+    };
+    "${builtins.unsafeDiscardStringContext drv.drvPath}" = {
+      outputs = [ "foo" "out" ];
+      allOutputs = true;
+    };
+  };
+
+  legit-context = builtins.getContext "${path}${drv.outPath}${drv.foo.outPath}${drv.drvPath}";
+
+  constructed-context = builtins.getContext (builtins.appendContext "" desired-context);
+in legit-context == constructed-context
diff --git a/third_party/nix/src/tests/lang/disabled/eval-okay-context.nix b/third_party/nix/src/tests/lang/disabled/eval-okay-context.nix
new file mode 100644
index 000000000000..7b9531cfe9e1
--- /dev/null
+++ b/third_party/nix/src/tests/lang/disabled/eval-okay-context.nix
@@ -0,0 +1,6 @@
+let s = "foo ${builtins.substring 33 100 (baseNameOf "${./eval-okay-context.nix}")} bar";
+in
+  if s != "foo eval-okay-context.nix bar"
+  then abort "context not discarded"
+  else builtins.unsafeDiscardStringContext s
+
diff --git a/third_party/nix/src/tests/lang/disabled/eval-okay-path.nix b/third_party/nix/src/tests/lang/disabled/eval-okay-path.nix
new file mode 100644
index 000000000000..e67168cf3edf
--- /dev/null
+++ b/third_party/nix/src/tests/lang/disabled/eval-okay-path.nix
@@ -0,0 +1,7 @@
+builtins.path
+  { path = ./.;
+    filter = path: _: baseNameOf path == "data";
+    recursive = true;
+    sha256 = "1yhm3gwvg5a41yylymgblsclk95fs6jy72w0wv925mmidlhcq4sw";
+    name = "output";
+  }
diff --git a/third_party/nix/src/tests/lang/disabled/eval-okay-search-path.nix b/third_party/nix/src/tests/lang/disabled/eval-okay-search-path.nix
new file mode 100644
index 000000000000..cca41f821f83
--- /dev/null
+++ b/third_party/nix/src/tests/lang/disabled/eval-okay-search-path.nix
@@ -0,0 +1,11 @@
+with import ./lib.nix;
+with builtins;
+
+assert pathExists <nix/buildenv.nix>;
+
+assert length __nixPath == 6;
+assert length (filter (x: x.prefix == "nix") __nixPath) == 1;
+assert length (filter (x: baseNameOf x.path == "dir4") __nixPath) == 1;
+
+import <a.nix> + import <b.nix> + import <c.nix> + import <dir5/c.nix>
+  + (let __nixPath = [ { path = ./dir2; } { path = ./dir1; } ]; in import <a.nix>)
diff --git a/third_party/nix/src/tests/lang/disabled/eval-okay-tail-call-1.nix b/third_party/nix/src/tests/lang/disabled/eval-okay-tail-call-1.nix
new file mode 100644
index 000000000000..a3962ce3fdb5
--- /dev/null
+++ b/third_party/nix/src/tests/lang/disabled/eval-okay-tail-call-1.nix
@@ -0,0 +1,3 @@
+let
+  f = n: if n == 100000 then n else f (n + 1);
+in f 0