package image

import (
	"metis/pkg/inject"
	"os"
	"os/exec"
	"path/filepath"
	"testing"
)

// Use a disposable filesystem image to verify actual debugfs symlink semantics.
func TestSystemdSymlinkOnExt4(t *testing.T) {
	for _, tool := range []string{"mkfs.ext4", "debugfs"} {
		if _, err := exec.LookPath(tool); err != nil {
			t.Skip("filesystem tools unavailable")
		}
	}
	fs := filepath.Join(t.TempDir(), "test.ext4")
	f, err := os.Create(fs)
	if err != nil {
		t.Fatal(err)
	}
	if err = f.Truncate(16 * 1024 * 1024); err != nil {
		t.Fatal(err)
	}
	if err = f.Close(); err != nil {
		t.Fatal(err)
	}
	if out, err := exec.Command("mkfs.ext4", "-q", "-F", fs).CombinedOutput(); err != nil {
		t.Fatalf("mkfs: %v %s", err, out)
	}
	files := []inject.FileSpec{
		{Path: "etc/systemd/system/metis-node-identity.service", Content: []byte("[Unit]\nDescription=Test\n"), Mode: 0644, RootFS: true},
		{Path: "etc/systemd/system/multi-user.target.wants/metis-node-identity.service", Symlink: "../metis-node-identity.service", RootFS: true},
	}
	for i := 0; i < 2; i++ {
		if err := writeExt4Files(fs, files); err != nil {
			t.Fatal(err)
		}
	}
	if err := verifyExt4File(fs, inject.FileSpec{Path: files[1].Path, Symlink: "../wrong.service"}, t.TempDir()); err == nil {
		t.Fatal("wrong target accepted")
	}
}