dagger/dagger · error

patch did not reproduce changeset content: modified %v, rena

Error message

patch did not reproduce changeset content: modified %v, renamed %v

What it means

reconcileDirsAfterPatch verification failure: the patched tree still differs from the expected changeset — files remain modified or renamed that the patch should have reproduced. The patch application produced wrong content for regular files.

Source

Thrown at core/mcp.go:955

	}
	dirChanged := slices.ContainsFunc(
		slices.Concat(origPaths.Added, origPaths.AllRemoved),
		func(p string) bool { return strings.HasSuffix(p, "/") },
	)
	if !dirChanged {
		return patched, nil
	}

	residual, err := NewChangeset(ctx, patched, changes.Self().After)
	if err != nil {
		return patched, err
	}
	paths, err := residual.ComputePaths(ctx)
	if err != nil {
		return patched, fmt.Errorf("compute patch residue: %w", err)
	}
	if len(paths.Modified) > 0 || len(paths.Renamed) > 0 {
		return patched, fmt.Errorf("patch did not reproduce changeset content: modified %v, renamed %v", paths.Modified, paths.Renamed)
	}
	for _, p := range slices.Concat(paths.Added, paths.AllRemoved) {
		if !strings.HasSuffix(p, "/") {
			return patched, fmt.Errorf("patch did not reproduce changeset file %q", p)
		}
	}
	// Recorded as selectors on the overlay chain, so they are pure data like
	// the patch itself, and replay tolerantly: withNewDirectory is mkdir -p,
	// withoutDirectory ignores an already-missing path.
	for _, dir := range paths.Added {
		if err := srv.Select(ctx, patched, &patched, dagql.Selector{
			View:  srv.View,
			Field: "withNewDirectory",
			Args: []dagql.NamedInput{
				{Name: "path", Value: dagql.NewString(strings.TrimSuffix(dir, "/"))},
			},
		}); err != nil {
			return patched, fmt.Errorf("restore directory %q: %w", dir, err)

View on GitHub (pinned to 82ba2681db)

Solutions

1. Regenerate the patch from the current diff rather than reusing a stale one
2. Check the patch applies cleanly (context lines, line endings)
3. Verify the 'after' tree recorded in the changeset matches expectations

When it happens

Trigger: Thrown at core/mcp.go:955 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of dagger/dagger@82ba2681db (2026-09-05). Data as JSON: /api/errors/a8d0c2fb5db1e06c. Report an issue: GitHub.