test mountBpfPinPath with a privileged test

pkg/internal/discover/attacher_linux_privileged_test.go

@@ -0,0 +1,55 @@
+//go:build linux
+
+package discover
+
+import (
+	"log/slog"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestMountBpfPinPath(t *testing.T) {
+	if os.Getenv(privilegedEnv) == "" {
+		t.Skipf("Set %s to run this test", privilegedEnv)
+	}
+	tmpDir := "path"
+	ta := &TraceAttacher{
+		log:     slog.With("component", "discover.TraceAttacher"),
+		pinPath: tmpDir,
+	}
+
+	// Nothing there to start the test
+	mounted, matched, err := IsMountFS(FilesystemTypeBPFFS, tmpDir)
+	assert.NoError(t, err)
+	assert.False(t, mounted)
+	assert.False(t, matched)
+
+	err = ta.mountBpfPinPath()
+	assert.NoError(t, err)
+
+	// Check that it is mounted
+	mounted, matched, err = IsMountFS(FilesystemTypeBPFFS, tmpDir)
+	assert.NoError(t, err)
+	assert.True(t, mounted)
+	assert.True(t, matched)
+
+	// Ensure mounting the same path twice does not fail
+	err = ta.mountBpfPinPath()
+	assert.NoError(t, err)
+
+	// Check that it is mounted
+	mounted, matched, err = IsMountFS(FilesystemTypeBPFFS, tmpDir)
+	assert.NoError(t, err)
+	assert.True(t, mounted)
+	assert.True(t, matched)
+
+	ta.unmountBpfPinPath()
+
+	// Check that it is cleaned up
+	mounted, matched, err = IsMountFS(FilesystemTypeBPFFS, tmpDir)
+	assert.NoError(t, err)
+	assert.False(t, mounted)
+	assert.False(t, matched)
+}