Updating NSS integration tests lib build logic

Instead of ignoring the tests during packaging, we can now override the
binary responsible to build the library.
This allows us to use the cargo wrapper (offered by dh-cargo) to build
the library offline, without automatically querying crates.io for the
dependencies.

debian/rules

@@ -12,11 +12,6 @@ export DPKG_GENSYMBOLS_CHECK_LEVEL := 4
 # Copy in build directory all content to embed
 export DH_GOLANG_INSTALL_ALL := 1
 
-# The NSS integration tests require building the Rust lib, which turns to crates.io by default.
-# Since specifying the --offline flag also does not work, we must skip the integration tests when
-# building the package.
-export AAD_SKIP_INTEGRATION_TESTS := 1
-
 # The following definitions are necessary because of the manual steps
 # we need to do to work around some issues with either dh-cargo,
 # the wrapper, or cargo
@@ -68,6 +63,14 @@ override_dh_auto_build:
 
 override_dh_auto_test:
 	dh_auto_test --buildsystem=cargo -- test --all
+
+	# We need to specify these Rust related variables to the Go tests in order to build the NSS lib
+	# with the cargo wrapper in the integration tests in order to force cargo to use vendored deps
+	# instead of querying crates.io for them.
+	DEB_HOST_GNU_TYPE=$(DEB_HOST_GNU_TYPE) \
+	DEB_HOST_RUST_TYPE=$(DEB_HOST_RUST_TYPE) \
+	CARGO_HOME=$(CURDIR)/debian/cargo_home \
+	CARGO_PATH=$(CARGO) \
 	dh_auto_test
 
 override_dh_auto_install:

nss/integration-tests/helper_test.go

@@ -11,7 +11,7 @@ import (
 	"testing"
 )
 
-var libPath string
+var targetDir, libPath string
 
 // outNSSCommandForLib returns the specific part for the nss command, filtering originOut.
 // It uses the locally build aad nss module for the integration tests.
@@ -65,19 +65,23 @@ func buildRustNSSLib() error {
 		return err
 	}
 	// Builds the nss library.
-	args := []string{"build", "--features", "integration-tests"}
-	cmd := exec.Command("cargo", args...)
+	args := []string{"build", "--verbose", "--features", "integration-tests", "--target-dir", targetDir}
+
+	cargo := os.Getenv("CARGO_PATH")
+	if cargo == "" {
+		cargo = "cargo"
+	}
+	// #nosec:G204 - we control the command arguments in tests
+	cmd := exec.Command(cargo, args...)
 	cmd.Dir = aadPath
 	if out, err := cmd.CombinedOutput(); err != nil {
 		return fmt.Errorf("could not build rust nss library (%s): %w", out, err)
 	}
+	targetDir = filepath.Join(targetDir, os.Getenv("DEB_HOST_RUST_TYPE"))
 
-	// Moves the compiled library to the expected path.
-	args = []string{filepath.Join(aadPath, "target", "debug", "libnss_aad.so"), libPath}
-	cmd = exec.Command("cp", args...)
-	if out, err := cmd.CombinedOutput(); err != nil {
-		return fmt.Errorf("could not copy the compiled rust nss library (%s): %w", out, err)
+	// Renames the compiled library to have the expected versioned name.
+	if err = os.Rename(filepath.Join(targetDir, "debug", "libnss_aad.so"), libPath); err != nil {
+		return fmt.Errorf("Setup: could not rename the Rust NSS library: %w", err)
 	}
-
 	return nil
 }

nss/integration-tests/integration_test.go

@@ -153,19 +153,14 @@ func TestIntegration(t *testing.T) {
 }
 
 func TestMain(m *testing.M) {
-	if os.Getenv("AAD_SKIP_INTEGRATION_TESTS") != "" {
-		fmt.Println("Integration tests skipped as requested")
-		return
-	}
-
 	// Build the NSS library and executable in a temporary directory and allow linking to it.
 	tmpDir, cleanup, err := createTempDir()
 	if err != nil {
 		os.Exit(1)
 	}
 	defer cleanup()
 
-	libPath = filepath.Join(tmpDir, "libnss_aad.so.2")
+	targetDir, libPath = tmpDir, filepath.Join(tmpDir, "libnss_aad.so.2")
 	// Builds the NSS Library.
 	if err = buildRustNSSLib(); err != nil {
 		cleanup()