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/* Create tests that run in the nix sandbox with additional access to selected host paths
This is for example useful for testing hardware where a tests needs access to
/sys and optionally more.
The following example shows a test that accesses the GPU:
Example:
makeImpureTest {
name = "opencl";
testedPackage = "mypackage"; # Or testPath = "mypackage.impureTests.opencl.testDerivation"
sandboxPaths = [ "/sys" "/dev/dri" ]; # Defaults to ["/sys"]
prepareRunCommands = ""; # (Optional) Setup for the runScript
nixFlags = []; # (Optional) nix-build options for the runScript
testScript = "...";
}
Save as `test.nix` next to a package and reference it from the package:
passthru.impureTests = { opencl = callPackage ./test.nix {}; };
`makeImpureTest` will return here a script that contains the actual nix-build command including all necessary sandbox flags.
It can be executed like this:
$(nix-build -A mypackage.impureTests)
Rerun an already cached test:
$(nix-build -A mypackage.impureTests) --check
*/
{ lib
, stdenv
, writeShellScript
, name
, testedPackage ? null
, testPath ? "${testedPackage}.impureTests.${name}.testDerivation"
, sandboxPaths ? [ "/sys" ]
, prepareRunCommands ? ""
, nixFlags ? [ ]
, testScript
, ...
} @ args:
let
sandboxPathsTests = builtins.map (path: "[[ ! -e '${path}' ]]") sandboxPaths;
sandboxPathsTest = lib.concatStringsSep " || " sandboxPathsTests;
sandboxPathsList = lib.concatStringsSep " " sandboxPaths;
testDerivation = stdenv.mkDerivation (lib.recursiveUpdate
{
name = "test-run-${name}";
requiredSystemFeatures = [ "nixos-test" ];
buildCommand = ''
mkdir -p $out
if ${sandboxPathsTest}; then
echo 'Run this test as *root* with `--option extra-sandbox-paths '"'${sandboxPathsList}'"'`'
exit 1
fi
# Run test
${testScript}
'';
passthru.runScript = runScript;
}
(builtins.removeAttrs args [
"lib"
"stdenv"
"writeShellScript"
"name"
"testedPackage"
"testPath"
"sandboxPaths"
"prepareRunCommands"
"nixFlags"
"testScript"
])
);
runScript = writeShellScript "run-script-${name}" ''
set -euo pipefail
${prepareRunCommands}
sudo nix-build --option extra-sandbox-paths '${sandboxPathsList}' ${lib.escapeShellArgs nixFlags} -A ${testPath} "$@"
'';
in
# The main output is the run script, inject the derivation for the actual test
runScript.overrideAttrs (old: {
passthru = { inherit testDerivation; };
})
|
