Troubleshooting your migration with GitHub Enterprise Importer

If your migration fails or produces unexpected results, you can try common troubleshooting steps.

In this article

About troubleshooting steps for GitHub Enterprise Importer

If your migration fails or produces unexpected results, try the first steps for troubleshooting below, which commonly resolve a variety of issues. If these first steps do not resolve your issue, check for error messages in the logs for your migration. Then, locate the error message in this article and try the steps for resolution.

If you're unable to resolve your issue after trying the troubleshooting steps for the error message, you can contact GitHub Support.

First steps for troubleshooting

Before you investigate further, try these troubleshooting steps that commonly resolve a variety of issues.

  1. Verify that you're using the latest version of the GitHub CLI extension you're using to migrate. If you're not, upgrade to the latest version.

  2. Verify that you meet all the access requirements. For more information, see the appropriate article for your migration path.

  3. Try running the migration again. Some migrations issues are transient, and a second attempt may work.

  4. Try running a migration on a different repository with similar data. This will help determine whether the issue is unique to the repository or represents a broader data shape problem.

If these steps do not resolve your issue, review the migration logs for error messages. The log you need to check will depend on whether your migration failed or succeeded.

Troubleshooting failed migrations

If your migration fails, review the verbose log entries produced by the GitHub CLI for each migration. The log file is saved in the same directory where you ran the migration.

The log contains a record of each command you issued and all of the API requests that the GitHub CLI made in response. Failures and error messages normally appear towards the end of the log.

Unable to run migrations

If you see an error like No access to createMigrationMutation or Missing permissions, your personal account does not have the required access to run the migration. Make sure you're either an organization owner or have been granted the migrator role. For more information about granting the migrator role, see About GitHub Enterprise Importer.

Note

If you're migrating between GitHub products, make sure you're an organization owner or have been granted the migrator role for both the source and target organizations.

Resource is protected by organization SAML enforcement

This error indicates that a personal access token you provided to the GitHub CLI needs to be authorized for use with SAML single sign-on. For more information, see Authorizing a personal access token for use with SAML single sign-on.

401 Unauthorized response

Failures that include a 401 status code usually indicate that the personal access token you provided to the GitHub CLI does not have the required scopes. Verify the scopes on the personal access tokens you provided. For more information about required scopes, see the appropriate article for your migration path.

404 Not Found response

Failures that include a 404 status code usually indicate a typo in one of your commands. Review the migration log for the exact command you entered, and check for typos in the source repository, organization, or project.

Archive generation failed response

If you receive a Archive generation failed... response when migrating from GitHub Enterprise Server, your repository is probably too large. For more information about repository size limits, see About migrations between GitHub products.

First, try excluding releases from the migration by using the --skip-releases flag with the migrate-repo command.

If that doesn't work, we'd recommend upgrading to GitHub Enterprise Server 3.8.0 or later. If you're unable to upgrade, another option is to generate your repository archives manually using ghe-migrator:

  1. Generate a migration archive for your repository. You must only export one repository at a time. For instructions, see "Exporting migration data from your enterprise."
  2. Upload your migration archive to your choice of blob storage provider.
  3. Generate a short-lived URL for your migration archive which is accessible to GitHub, such as an AWS S3 pre-signed URL or Azure Blob Storage SAS URL.
  4. Call the migrate-repo command with the --git-archive-url and --metadata-archive-url flags both set to the URL of your archive from the previous step.

cipher name is not supported error

If you're migrating from Bitbucket Server and receive an error like cipher name aes256-ctr for openssh key file is not supported when running a migration, your SSH private key uses an unsupported cipher. For more information about supported ciphers, see Managing access for a migration from Bitbucket Server.

To generate a new, compatible SSH keypair, run the following command:

Shell
ssh-keygen -t ed25519 -Z aes256-cbc -C "your_email@example.com"

After generating a new SSH keypair, before you can use the key, you must add the public key to your Bitbucket Server instance's authorized_keys.

Subsystem 'sftp' could not be executed error

If you're migrating from Bitbucket Server and receive an error like Subsystem 'sftp' could not be executed, SFTP is not enabled on your server or your user account does not have SFTP access.

You should contact your server administrator and ask them to enable SFTP access for your user account.

Source export archive... does not exist error

If you're migrating from Bitbucket Server and you receive an error like Source export archive (/var/atlassian/application-data/bitbucket/shared/migration/export/Bitbucket_export_1.tar) does not exist, the GitHub CLI is looking for your migration archive in the wrong place on your Bitbucket Server instance.

To resolve this issue, set the --bbs-shared-home argument for gh bbs2gh migrate-repo to your Bitbucket Server or Data Center's shared home directory. The default shared home directory is /var/atlassian/application-data/bitbucket/shared, but your configuration may be different.

You can identify the shared home directory in Bitbucket Server.

  1. Navigate to the Administration area of your Bitbucket Server or Data Center instance.
  2. In the sidebar, under "System," click Storage.
  3. Under "Shared directory," view the location of your server's shared home directory.

If you're running Bitbucket Data Center in cluster mode with multiple notes, your shared directory will be shared between cluster nodes and should be mounted in the same location on each node.

Repository rule violations found error

If you receive a Repository rule violations found error, such as GH013: Repository rule violations found for refs/heads/main, data in the origin repository conflicts with rulesets configured on the destination organization. For more information, see About rulesets.

You can temporarily disable your rulesets during your migration, or you can use bypass mode or the bypass list to exempt your migration from configured rules. For more information, see Managing rulesets for repositories in your organization.

Your push would publish a private email address error

If you receive a Git source migration failed error with GH007: Your push would publish a private email address, the Git source you're trying to migrate includes commits authored by an email address that you have blocked from being pushed to GitHub. For more information, see Blocking command line pushes that expose your personal email address in the GitHub Enterprise Cloud documentation.

To resolve this error, you can either rewrite the Git history to remove the email address, or you can disable the "Block command line pushes that expose my email" setting.

Understanding migration log warnings

Even if your migration succeeds, you should still review the migration log to check for warnings.

Warnings in the migration log point to specific items within the repository which could not be migrated. For more information, see Accessing your migration logs for GitHub Enterprise Importer.

Note

If the "Migration Log" issue includes "Migration completed" at the bottom, the repository was migrated. Warnings only indicate that specific items within the repository, such as a comment on a pull request, may not have migrated correctly.

Warning: "Repository metadata too big to migrate"

If you see "Repository metadata too big to migrate" in the "Migration Log" issue or the GitHub CLI, your repository exceeds the maximum archive size of 10 GB. This is often caused by large release assets. Try excluding releases from the migration with the --skip-releases flag for the migrate-repo command.

Warning: "Comment not in diff"

If you're migrating from Azure DevOps, pull request comments on lines that were never changed in the pull request cannot be migrated to GitHub. You'll see this warning for every comment that cannot be migrated for this reason.

Note

Only comments on lines that weren't changed in a pull request are affected by this limitation. Comments on lines that were changed in a pull request are migrated.

Be aware that the affected comments will not be in the migrated repository, but these warnings do not require further action from you.

Warning: "Pull Request Review...could not be imported due to REVIEW_THREAD_MISSING_END_COMMIT_OID error"

This warning occurs where a pull request review could not be migrated because the commit that the review is attached to no longer exists.

This usually happens where commits have been removed with a force push, or a branch has been deleted.

In this case, the comments are not lost, but are migrated as inline pull request comments to preserve history, rather than as a review attached to a specific commit.

Team references are broken after an organization migration

References to teams, such as @octo-org/octo-team, are not updated as part of an organization migration. This might cause problems in the destination organization, such as CODEOWNERS files not working as expected.

You can either update these references after the migration, or you can preserve your team names by renaming the source organization so that you can use the original name for your destination organization.

For example, if your source organization is @octo-org, and your CODEOWNERS file includes a reference to the team @octo-org/octo-team, you could rename the source organization to @octo-org-temp before your migration, allowing you to use @octo-org as the name of the new organization. Then, the migrated team would be called @octo-org/octo-team, and the CODEOWNERS file in the migrated repository will work as expected.

Locked repositories

After a migration, you may find that your source or destination repositories are locked, disabling access to the repository's code and all of its resources, such as issues and pull requests. For more information about locked repositories, see About locked repositories.

The process for unlocking a repository depends on the GitHub product where the repository is stored.

  • If the locked repository is on GitHub Enterprise Server, a site administrator can unlock the repository using the site admin dashboard. For more information, see Locking a repository.
  • If the locked repository is on GitHub.com, you can contact your site administrator to unlock the repository.

Note

If your migration failed, not all of your data was migrated. If you choose to unlock and use the repository, there will be data loss. Deleting the locked repository and retrying the migration may be a better option.

Contacting GitHub Support

If you're still unable to resolve your issue after trying the troubleshooting steps above, you can contact GitHub Support through the GitHub Support portal.