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About default setup

Default setup for code scanning is the quickest, easiest, most low-maintenance way to enable code scanning for your repository. Based on the code in your repository, default setup will automatically create a custom code scanning configuration. After enabling default setup, the code written in CodeQL-supported languages in your repository will be scanned:

• On each push to the repository's default branch, or any protected branch. For more information on protected branches, see About protected branches.
• When creating or committing to a pull request based against the repository's default branch, or any protected branch, excluding pull requests from forks.
• On a weekly schedule.

You can also enable default setup for multiple or all repositories in an organization at the same time. For information on bulk enablement, see Configuring default setup for code scanning at scale.

If you need more granular control over your code scanning configuration, you should instead configure advanced setup. For more information, see Configuring advanced setup for code scanning.

Requirements for using default setup

Your repository is eligible for default setup for code scanning if:

• GitHub Actions are enabled.
• It is publicly visible, or GitHub Code Security is enabled.

We recommend enabling default setup for eligible repositories if there is any chance the repositories will include at least one CodeQL-supported language in the future. If you enable default setup on a repository that does not include any CodeQL-supported languages, default setup will not run any scans or use any GitHub Actions minutes. If CodeQL-supported languages are added to the repository's default branch, default setup will automatically begin scanning CodeQL-supported languages and using GitHub Actions minutes. For more information on CodeQL-supported languages, see About code scanning with CodeQL.

You can use default setup for all CodeQL-supported languages for self-hosted runners or GitHub-hosted runners. See Assigning labels to runners, later in this article.

Default setup uses the none build mode for C/C++, C# and Java and uses the autobuild build mode for other compiled languages. You should configure your self-hosted runners to make sure they can run all the necessary commands for C/C++, C#, and Swift analysis. Analysis of JavaScript/TypeScript, Go, Ruby, Python, and Kotlin code does not currently require special configuration.

Customizing default setup

We recommend that you start using code scanning with default setup. After you've initially configured default setup, you can evaluate code scanning to see how it's working for you. If you find that something isn't working as you expect, you can customize default setup to better meet your needs. For more information, see Evaluating default setup for code scanning.

About adding non-compiled and compiled languages to your default setup

If the code in a repository changes to include Go, JavaScript/TypeScript, Python, or Ruby, GitHub will automatically update the code scanning configuration to include the new language. If code scanning fails with the new configuration, GitHub will resume the previous configuration automatically so the repository does not lose code scanning coverage.

Compiled languages are not automatically included in default setup configuration because they often require more advanced configuration, but you can manually select any CodeQL-supported compiled language for analysis.

Configuring default setup for a repository

1. On GitHub, navigate to the main page of the repository.

   Note

   If you are configuring default setup on a fork, you must first enable GitHub Actions. To enable GitHub Actions, under your repository name, click Actions, then click I understand my workflows, go ahead and enable them. Be aware that this will enable all existing workflows on your fork.

2. Under your repository name, click Settings. If you cannot see the "Settings" tab, select the dropdown menu, then click Settings.

   

3. In the "Security" section of the sidebar, click Advanced Security.

4. To the right of "Code Security", click Enable.

5. Under "Code Security", to the right of "CodeQL analysis", select Set up , then click Default.

   

   You will then see a "CodeQL default configuration" dialog summarizing the code scanning configuration automatically created by default setup.

   Note

   If your repository contains only compiled CodeQL-supported languages (for example, Java), you will be taken to the settings page to select the languages you want to add to your default setup configuration.

6. Optionally, to customize your code scanning setup, click Edit.

   • To add or remove a language from the analysis performed by default setup, select or deselect that language in the "Languages" section. If you would like to analyze a CodeQL-supported compiled language with default setup, select that language here.
   • To specify the CodeQL query suite you would like to use, select your preferred query suite in the "Query suites" section.

7. Review the settings for default setup on your repository, then click Enable CodeQL. This will trigger a workflow that tests the new, automatically generated configuration.

   Note

   If you are switching to default setup from advanced setup, you will see a warning informing you that default setup will override existing code scanning configurations. This warning means default setup will disable the existing workflow file and block any CodeQL analysis API uploads.

8. Optionally, to view your default setup configuration after enablement, select , then click View CodeQL configuration.

Assigning labels to runners

You can also assign self-hosted runners with the default code-scanning label, or you can optionally give them custom labels so that individual repositories can use different runners. For information about assigning labels to self-hosted runners, see Using labels with self-hosted runners.

Specifying custom labels for self-hosted runners is optional. Unless you have a specific use case, we recommend that you only assign runners with the default code-scanning label. For example, you may want to:

• Assign more powerful self-hosted runners to critical repositories for faster code scanning analysis.
• Run your code scanning analyses on a particular platform (for example, macOS).
• Have granular control over the workload for your GitHub-hosted runners and self-hosted runners.

Once you've assigned custom labels to self-hosted runners, your repositories can use those runners for code scanning default setup. For more information, see Configuring default setup for a repository, earlier in this article.

You can also use security configurations to assign labels to self-hosted runners for code scanning. See Creating a custom security configuration.

Assigning larger runners

To assign a larger runner, name the runner code-scanning. This will automatically add the code-scanning label to the larger runner. An organization can only have one larger runner with the code-scanning label, and that runner will handle all code scanning jobs from repositories within your organization with access to the runner's group. See Configuring larger runners for default setup.

Next steps

After your configuration runs successfully at least once, you can start examining and resolving code scanning alerts. For more information on code scanning alerts, see About code scanning alerts and Assessing code scanning alerts for your repository.

After you've configured default setup for code scanning, you can read about evaluating how it's working for you and the next steps you can take to customize it. For more information, see Evaluating default setup for code scanning.

You can find detailed information about your code scanning configuration, including timestamps for each scan and the percentage of files scanned, on the tool status page. For more information, see About the tool status page for code scanning.

When you configure default setup, you may encounter an error. For information on troubleshooting specific errors, see Troubleshooting code scanning.