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package e2e
import (
"fmt"
"os"
"os/exec"
"path/filepath"
"testing"
)
// TestResourceExhaustion ensures that repeatedly starting and stopping
// tunnels does not leak mounts, file descriptors, or namespaces.
func TestResourceExhaustion(t *testing.T) {
binaryPath := EnsureBinary(t)
tmpRuntimeDir := t.TempDir()
tmpConfigDir := t.TempDir()
profile := "stress-test"
profilesDir := filepath.Join(tmpConfigDir, "wg-wrap", "profiles")
if err := os.MkdirAll(profilesDir, 0755); err != nil {
t.Fatal(err)
}
profileConfPath := filepath.Join(profilesDir, profile+".conf")
conf := `[Interface]
Address = 10.0.0.2/24
PrivateKey = 0000000000000000000000000000000000000000000000000000000000000000
[Peer]
PublicKey = 0000000000000000000000000000000000000000000000000000000000000000
AllowedIPs = 0.0.0.0/0
Endpoint = 1.1.1.1:51820
`
if err := os.WriteFile(profileConfPath, []byte(conf), 0644); err != nil {
t.Fatal(err)
}
// We run a burst of short-lived commands to stress the lock and cleanup logic.
iterations := 50
for i := 0; i < iterations; i++ {
cmd := exec.Command(binaryPath, "--profile", profile, "--", "true")
cmd.Env = append(os.Environ(),
fmt.Sprintf("XDG_RUNTIME_DIR=%s", tmpRuntimeDir),
fmt.Sprintf("XDG_CONFIG_HOME=%s", tmpConfigDir),
)
if err := cmd.Run(); err != nil {
t.Fatalf("Iteration %d failed: %v", i, err)
}
}
// After all iterations, the pin file should be gone.
nsPath := filepath.Join(tmpRuntimeDir, "profiles", profile+".ns")
if _, err := os.Stat(nsPath); err == nil {
t.Errorf("BUG: Namespace pin file %s still exists after %d iterations", nsPath, iterations)
}
// PIDs directory should be empty or gone.
pidsDir := filepath.Join(tmpRuntimeDir, "profiles", profile, "pids")
if files, err := os.ReadDir(pidsDir); err == nil && len(files) > 0 {
t.Errorf("BUG: PIDs directory not empty after stress test: %d files remaining", len(files))
}
}
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