package main

  import (
      "fmt"
      "os"
      "os/exec"
      "path/filepath"
      "time"

      "github.com/go-git/go-git/v6"
      "github.com/go-git/go-git/v6/plumbing/object"
  )

  func main() {
      // Create test structure
      tmpDir := "/tmp/gogit-worktree-test"
      os.RemoveAll(tmpDir)
      os.MkdirAll(tmpDir, 0755)

      mainRepoDir := filepath.Join(tmpDir, "main-repo")
      worktreeDir := filepath.Join(tmpDir, "worktree")

      // Init main repo
      exec.Command("git", "init", mainRepoDir).Run()

      // Create initial commit
      os.WriteFile(filepath.Join(mainRepoDir, "file.txt"), []byte("test"), 0644)
      exec.Command("git", "-C", mainRepoDir, "add", ".").Run()
      exec.Command("git", "-C", mainRepoDir, "commit", "-m", "initial").Run()

      // Create worktree
      exec.Command("git", "-C", mainRepoDir, "worktree", "add", worktreeDir, "-b", "test-branch").Run()

      // Change to worktree directory
      os.Chdir(worktreeDir)

      // Open with go-git v6
      repo, err := git.PlainOpenWithOptions(".", &git.PlainOpenOptions{
          EnableDotGitCommonDir: true,
      })
      if err != nil {
          fmt.Printf("Open failed: %v\n", err)
          return
      }

      wt, _ := repo.Worktree()

      // Create a new file
      os.WriteFile(filepath.Join(worktreeDir, "newfile.txt"), []byte("content"), 0644)

      // Try to add it - THIS FAILS
      _, err = wt.Add("newfile.txt")
      if err != nil {
          fmt.Printf("Add failed: %v\n", err)
          return
      }

      // Try to commit
      _, err = wt.Commit("test commit", &git.CommitOptions{
          Author: &object.Signature{Name: "Test", Email: "[email protected]", When: time.Now()},
      })
      if err != nil {
          fmt.Printf("Commit failed: %v\n", err)
          return
      }

      fmt.Println("Success!")
  }