git-ecosystem/git-credential-manager · warning · Trace2Exception

User cancelled dialog.

Error message

User cancelled dialog.

What it means

CredentialsCommand (the GUI credential dialog) shows a window and inspects viewModel.WindowResult after it closes. If the user dismissed/cancelled the dialog, WindowResult is false and a Trace2Exception('User cancelled dialog.') is thrown so the cancellation is recorded in Git's trace2 output rather than treated as a success with no data.

Solutions

1. Complete the dialog and click OK/Submit instead of cancelling.
2. If cancellation is intentional, let the host handle it — git treats the helper's failure as 'no credential' and may fall back to another helper.
3. Avoid repeated prompts by storing credentials after first successful auth (GCM's cache/OS stores) or use a PAT in the remote URL/credential store.
4. In automation, prevent the dialog entirely: GCM_INTERACTIVE=never or GUI=never so a non-interactive path is used.

Example fix

// before (CI invoking GUI helper)
git fetch   // dialog appears, auto-cancelled -> Trace2Exception
// after
set GCM_INTERACTIVE=never
set GCM_GUI=never

// Don't open the dialog if the session can't interact with it:
bool guiUsable = Environment.UserInteractive && !Console.IsOutputRedirected;

try { await credentialsCommand.ExecuteAsync(...); }
catch (Trace2Exception ex) when (ex.Message == "User cancelled dialog.")
{ // treat as 'no credential provided', not a hard failure
  return Result.Cancelled(); }

When it happens

Trigger: Showing the credential dialog via ExecuteAsync (git credential fill routing to the GUI helper) and the user clicks Cancel, closes the window, or presses Escape, making WindowResult false.

Common situations: Users hitting Escape or the X button on the credential prompt; dialogs killed by focus/automation tools; headless-with-GUI setups where the dialog cannot be interacted with and gets dismissed.

Related errors

• User cancelled dialog.
• Cannot show prompt because GUI prompts have been disabled.
• Failed to search for credentials
• Failed to store credentials
• -1

AI-assisted analysis of git-ecosystem/git-credential-manager@e8ce762cd0 (2026-09-11). Data as JSON: /api/errors/d7ee01af5f201d2c. Report an issue: GitHub.

Appendix: source

Thrown at src/Core/UI/Commands/CredentialsCommand.cs:53

                viewModel.Title = title;
            }

            viewModel.Description = !string.IsNullOrWhiteSpace(resource)
                ? $"Enter your credentials for '{resource}'"
                : "Enter your credentials";

            if (!string.IsNullOrWhiteSpace(userName))
            {
                viewModel.UserName = userName;
            }

            viewModel.ShowProductHeader = !noLogo;

            await ShowAsync(viewModel, CancellationToken.None);

            if (!viewModel.WindowResult)
            {
                throw new Trace2Exception(Context.Trace2, "User cancelled dialog.");
            }

            WriteResult(
                new Dictionary<string, string>
                {
                    ["username"] = viewModel.UserName,
                    ["password"] = viewModel.Password
                }
            );
            return 0;
        }

        protected abstract Task ShowAsync(CredentialsViewModel viewModel, CancellationToken ct);
    }
}

View on GitHub (pinned to e8ce762cd0)