windows tests: exit 0 on success, fix $FAIL escaping

artiq/windows/default.nix

@@ -1,3 +1,5 @@
+# This runs `run-test.nix` with `nix-build`
+
 { pkgs ? import <nixpkgs> {},
   diskImage ? "/opt/windows/c.img",
   qemuMem ? "2G",

artiq/windows/run-test.nix

@@ -57,7 +57,7 @@ stdenv.mkDerivation {
       ${ssh "anaconda\\scripts\\activate ${condaEnv} && conda install artiq.tar.bz2"}
     done
 
-    # Allow tests to run for 2 minutes
+    # Schedule a timed shutdown against hanging test runs
     ${ssh "shutdown -s -t ${toString testTimeout}"}
 
     FAIL=n
@@ -69,8 +69,11 @@ stdenv.mkDerivation {
     ${ssh "shutdown -p -f"}
     wait
 
-    [ "\\\$FAIL" = "y" ] && exit 1
-
+    if [ "\$FAIL" = "y" ]; then
+      exit 1
+    else
+      exit 0
+    fi
     EOF
     chmod a+x $out/bin/run.sh
   '';

main.nix

@@ -51,6 +51,18 @@ in
       constituents = builtins.attrValues jobs;
     };
 
+    windows-no-hardware-tests = pkgs.stdenv.mkDerivation {
+      name = "windows-no-hardware-tests";
+      # dummy src
+      src = generatedNix;
+      buildInputs = [ (windowsRunner {}) ];
+      phases = [ "buildPhase" ];
+      buildPhase = ''
+        ${windowsRunner {}}/bin/run.sh
+        touch $out
+      '';
+    };
+
     # HACK: Abuse fixed-output derivations to escape the sandbox and run the hardware
     # unit tests, all integrated in the Hydra interface.
     # One major downside of this hack is the tests are only run when generateTestOkHash
@@ -89,7 +101,7 @@ in
       export ARTIQ_LOW_LATENCY=1
       python -m unittest discover -v artiq.test.coredevice
 
-      ${windowsRunner { testCommand = "set ARTIQ_ROOT=%cd%\\anaconda\\envs\\artiq-env\\Lib\\site-packages\\artiq\\examples\\kc705_nist_clock&&set ARTIQ_LOW_LATENCY=1&&python -m unittest discover -v artiq.test"; }}/bin/run.sh
+      ${windowsRunner { testCommand = "set ARTIQ_ROOT=%cd%\\anaconda\\envs\\artiq-env\\Lib\\site-packages\\artiq\\examples\\kc705_nist_clock&&set ARTIQ_LOW_LATENCY=1&&python -m unittest discover -v artiq.test.coredevice"; }}/bin/run.sh
 
       mkdir $out
       cp ${generatedNix}/pkgs/artiq-version.nix $out/passed