GitHub Actions Importer を使った Travis CI からの移行

About migrating from Travis CI with GitHub Actions Importer

The instructions below will guide you through configuring your environment to use GitHub Actions Importer to migrate Travis CI pipelines to GitHub Actions.

Prerequisites

A Travis CI account or organization with pipelines and jobs that you want to convert to GitHub Actions workflows.
Access to create a Travis CI API access token for your account or organization.
An environment where you can run Linux-based containers, and can install the necessary tools.
- Docker is installed and running.
- GitHub CLI is installed.
Note: The GitHub Actions Importer container and CLI do not need to be installed on the same server as your CI platform.

Limitations

There are some limitations when migrating from Travis CI pipelines to GitHub Actions with GitHub Actions Importer.

Manual tasks

Certain Travis CI constructs must be migrated manually. These include:

Secrets
Unknown job properties

For more information on manual migrations, see "Migrating from Travis CI to GitHub Actions."

GitHub Actions Importer transforms Travis CI project languages by adding a set of preconfigured build tools and a default build script to the transformed workflow. If no language is explicitly declared, GitHub Actions Importer assumes a project language is Ruby.

For a list of the project languages supported by GitHub Actions Importer, see "Supported project languages."

Installing the GitHub Actions Importer CLI extension

Install the GitHub Actions Importer CLI extension:

Bash

gh extension install github/gh-actions-importer

gh extension install github/gh-actions-importer

Verify that the extension is installed:

$ gh actions-importer -h
Options:
  -?, -h, --help  Show help and usage information

Commands:
  update     Update to the latest version of GitHub Actions Importer.
  version    Display the version of GitHub Actions Importer.
  configure  Start an interactive prompt to configure credentials used to authenticate with your CI server(s).
  audit      Plan your CI/CD migration by analyzing your current CI/CD footprint.
  forecast   Forecast GitHub Actions usage from historical pipeline utilization.
  dry-run    Convert a pipeline to a GitHub Actions workflow and output its yaml file.
  migrate    Convert a pipeline to a GitHub Actions workflow and open a pull request with the changes.

Configuring credentials

The configure CLI command is used to set required credentials and options for GitHub Actions Importer when working with Travis CI and GitHub.

Create a GitHub personal access token (classic). For more information, see "Managing your personal access tokens."

Your token must have the workflow scope.

After creating the token, copy it and save it in a safe location for later use.
Create a Travis CI API access token. For more information, see Get your Travis CI API token in the Travis CI documentation.

After creating the token, copy it and save it in a safe location for later use.
In your terminal, run the GitHub Actions Importer configure CLI command:
```
gh actions-importer configure
```
The configure command will prompt you for the following information:
- For "Which CI providers are you configuring?", use the arrow keys to select Travis CI, press Space to select it, then press Enter.
- For "Personal access token for GitHub", enter the value of the personal access token (classic) that you created earlier, and press Enter.
- For "Base url of the GitHub instance", enter the URL for your GitHub Enterprise Server instance, and press Enter.
- For "Personal access token for Travis CI", enter the value for the Travis CI API access token that you created earlier, and press Enter.
- For "Base url of the Travis CI instance", enter the URL of your Travis CI instance, and press Enter.
- For "Travis CI organization name", enter the name of your Travis CI organization, and press Enter.
An example of the output of the configure command is shown below.
```
$ gh actions-importer configure
✔ Which CI providers are you configuring?: Travis CI
Enter the following values (leave empty to omit):
✔ Personal access token for GitHub: ***************
✔ Base url of the GitHub instance: https://github.com
✔ Personal access token for Travis CI: ***************
✔ Base url of the Travis CI instance: https://travis-ci.com
✔ Travis CI organization name: actions-importer-labs
Environment variables successfully updated.
```
In your terminal, run the GitHub Actions Importer update CLI command to connect to GitHub Packages Container registry and ensure that the container image is updated to the latest version:
```
gh actions-importer update
```
The output of the command should be similar to below:
```
Updating ghcr.io/actions-importer/cli:latest...
ghcr.io/actions-importer/cli:latest up-to-date
```

Perform an audit of Travis CI

You can use the audit command to get a high-level view of all pipelines in a Travis CI server.

The audit command performs the following steps:

Fetches all of the projects defined in a Travis CI server.
Converts each pipeline to its equivalent GitHub Actions workflow.
Generates a report that summarizes how complete and complex of a migration is possible with GitHub Actions Importer.

Running the audit command

To perform an audit of a Travis CI server, run the following command in your terminal:

gh actions-importer audit travis-ci --output-dir tmp/audit

Inspecting the audit results

The files in the specified output directory contain the results of the audit. See the audit_summary.md file for a summary of the audit results.

The audit summary has the following sections.

Pipelines

The "Pipelines" section contains a high-level statistics regarding the conversion rate done by GitHub Actions Importer.

Listed below are some key terms that can appear in the "Pipelines" section:

Successful pipelines had 100% of the pipeline constructs and individual items converted automatically to their GitHub Actions equivalent.
Partially successful pipelines had all of the pipeline constructs converted, however, there were some individual items that were not converted automatically to their GitHub Actions equivalent.
Unsupported pipelines are definition types that are not supported by GitHub Actions Importer.
Failed pipelines encountered a fatal error when being converted. This can occur for one of three reasons:
- The pipeline was originally misconfigured and not valid.
- GitHub Actions Importer encountered an internal error when converting it.
- There was an unsuccessful network response that caused the pipeline to be inaccessible, which is often due to invalid credentials.

Build steps

The "Build steps" section contains an overview of individual build steps that are used across all pipelines, and how many were automatically converted by GitHub Actions Importer.

Listed below are some key terms that can appear in the "Build steps" section:

A known build step is a step that was automatically converted to an equivalent action.
An unknown build step is a step that was not automatically converted to an equivalent action.
An unsupported build step is a step that is either:
- Fundamentally not supported by GitHub Actions.
- Configured in a way that is incompatible with GitHub Actions.
An action is a list of the actions that were used in the converted workflows. This can be important for:
- If you use GitHub Enterprise Server, gathering the list of actions to sync to your instance.
- Defining an organization-level allowlist of actions that are used. This list of actions is a comprehensive list of actions that your security or compliance teams may need to review.

Manual tasks

The "Manual tasks" section contains an overview of tasks that GitHub Actions Importer is not able to complete automatically, and that you must complete manually.

Listed below are some key terms that can appear in the "Manual tasks" section:

A secret is a repository or organization-level secret that is used in the converted pipelines. These secrets must be created manually in GitHub Actions for these pipelines to function properly. For more information, see "Using secrets in GitHub Actions."
A self-hosted runner refers to a label of a runner that is referenced in a converted pipeline that is not a GitHub-hosted runner. You will need to manually define these runners for these pipelines to function properly.

Files

The final section of the audit report provides a manifest of all the files that were written to disk during the audit.

Each pipeline file has a variety of files included in the audit, including:

The original pipeline as it was defined in GitHub.
Any network responses used to convert the pipeline.
The converted workflow file.
Stack traces that can be used to troubleshoot a failed pipeline conversion.

Additionally, the workflow_usage.csv file contains a comma-separated list of all actions, secrets, and runners that are used by each successfully converted pipeline. This can be useful for determining which workflows use which actions, secrets, or runners, and can be useful for performing security reviews.

Forecast potential build runner usage

You can use the forecast command to forecast potential GitHub Actions usage by computing metrics from completed pipeline runs in your Travis CI server.

Running the forecast command

To perform a forecast of potential GitHub Actions usage, run the following command in your terminal. By default, GitHub Actions Importer includes the previous seven days in the forecast report.

gh actions-importer forecast travis-ci --output-dir tmp/forecast

Inspecting the forecast report

The forecast_report.md file in the specified output directory contains the results of the forecast.

Listed below are some key terms that can appear in the forecast report:

The job count is the total number of completed jobs.
The pipeline count is the number of unique pipelines used.
Execution time describes the amount of time a runner spent on a job. This metric can be used to help plan for the cost of GitHub-hosted runners.
- This metric is correlated to how much you should expect to spend in GitHub Actions. This will vary depending on the hardware used for these minutes. You can use the GitHub Actions pricing calculator to estimate the costs.
Queue time metrics describe the amount of time a job spent waiting for a runner to be available to execute it.
Concurrent jobs metrics describe the amount of jobs running at any given time. This metric can be used to define the number of runners you should configure.

Additionally, these metrics are defined for each queue of runners in Travis CI. This is especially useful if there is a mix of hosted or self-hosted runners, or high or low spec machines, so you can see metrics specific to different types of runners.

Perform a dry-run migration of a Travis CI pipeline

You can use the dry-run command to convert a Travis CI pipeline to an equivalent GitHub Actions workflow. A dry-run creates the output files in a specified directory, but does not open a pull request to migrate the pipeline.

To perform a dry run of migrating your Travis CI pipelines to GitHub Actions, run the following command in your terminal, replacing my-travis-ci-repository with the name of your Travis CI repository.

gh actions-importer dry-run travis-ci --travis-ci-repository my-travis-ci-repository --output-dir tmp/dry-run

You can view the logs of the dry run and the converted workflow files in the specified output directory.

If there is anything that GitHub Actions Importer was not able to convert automatically, such as unknown build steps or a partially successful pipeline, you might want to create custom transformers to further customize the conversion process. For more information, see "Extending GitHub Actions Importer with custom transformers."

Perform a production migration of a Travis CI pipeline

You can use the migrate command to convert a Travis CI pipeline and open a pull request with the equivalent GitHub Actions workflow.

Running the migrate command

To migrate a Travis CI pipeline to GitHub Actions, run the following command in your terminal, replacing the target-url value with the URL for your GitHub repository, and my-travis-ci-repository with the name of your Travis CI repository.

gh actions-importer migrate travis-ci --target-url https://github.com/octo-org/octo-repo --output-dir tmp/migrate --travis-ci-repository my-travis-ci-repository

The command's output includes the URL to the pull request that adds the converted workflow to your repository. An example of a successful output is similar to the following:

$ gh actions-importer migrate travis-ci --target-url https://github.com/octo-org/octo-repo --output-dir tmp/migrate --travis-ci-repository my-travis-ci-repository
[2022-08-20 22:08:20] Logs: 'tmp/migrate/log/actions-importer-20220916-014033.log'
[2022-08-20 22:08:20] Pull request: 'https://github.com/octo-org/octo-repo/pull/1'

Inspecting the pull request

The output from a successful run of the migrate command contains a link to the new pull request that adds the converted workflow to your repository.

Some important elements of the pull request include:

In the pull request description, a section called Manual steps, which lists steps that you must manually complete before you can finish migrating your pipelines to GitHub Actions. For example, this section might tell you to create any secrets used in your workflows.
The converted workflows file. Select the Files changed tab in the pull request to view the workflow file that will be added to your GitHub Enterprise Server repository.

When you are finished inspecting the pull request, you can merge it to add the workflow to your GitHub Enterprise Server repository.

Reference

This section contains reference information on environment variables, optional arguments, and supported syntax when using GitHub Actions Importer to migrate from Travis CI.

Using environment variables

GitHub Actions Importer uses environment variables for its authentication configuration. These variables are set when following the configuration process using the configure command. For more information, see the "Configuring credentials" section.

GitHub Actions Importer uses the following environment variables to connect to your Travis CI instance:

GITHUB_ACCESS_TOKEN: The personal access token (classic) used to create pull requests with a converted workflow (requires the workflow scope).
GITHUB_INSTANCE_URL: The URL to the target GitHub instance (for example, https://github.com).
TRAVIS_CI_ACCESS_TOKEN: The Travis CI API access token used to view Travis CI resources.
TRAVIS_CI_ORGANIZATION: The organization name of your Travis CI instance.
TRAVIS_CI_INSTANCE_URL: The URL of the Travis CI instance.
TRAVIS_CI_SOURCE_GITHUB_ACCESS_TOKEN: (Optional) The personal access token used to authenticate with your source GitHub instance. If not provided, GITHUB_ACCESS_TOKEN will be used instead.
TRAVIS_CI_SOURCE_GITHUB_INSTANCE_URL: (Optional) The URL to the source GitHub instance, such as https://github.com. If not provided, GITHUB_INSTANCE_URL will be used instead.

These environment variables can be specified in a .env.local file that is loaded by GitHub Actions Importer when it is run.

Using optional arguments

There are optional arguments you can use with the GitHub Actions Importer subcommands to customize your migration.

`--source-file-path`

You can use the --source-file-path argument with the forecast, dry-run, or migrate subcommands.

By default, GitHub Actions Importer fetches pipeline contents from source control. The --source-file-path argument tells GitHub Actions Importer to use the specified source file path instead.

For example:

gh actions-importer dry-run travis-ci --output-dir ./path/to/output/ --travis-ci-repository my-travis-ci-repository --source-file-path ./path/to/.travis.yml

`--allow-inactive-repositories`

You can use this argument to specify whether GitHub Actions Importer should include inactive repositories in an audit. If this option is not set, inactive repositories are not included in audits.

gh actions-importer dry-run travis-ci --output-dir ./path/to/output/ --travis-ci-repository my-travis-ci-repository --allow-inactive-repositories

`--config-file-path`

You can use the --config-file-path argument with the audit, dry-run, and migrate subcommands.

By default, GitHub Actions Importer fetches pipeline contents from source control. The --config-file-path argument tells GitHub Actions Importer to use the specified source files instead.

Audit example

In this example, GitHub Actions Importer uses the specified YAML configuration file to perform an audit.

gh actions-importer audit travis-ci --output-dir ./path/to/output/ --config-file-path ./path/to/travis-ci/config.yml

To audit a Travis CI instance using a configuration file, the file must be in the following format and each repository_slug value must be unique:

source_files:
  - repository_slug: travis-org-name/travis-repo-name
    path: path/to/.travis.yml
  - repository_slug: travis-org-name/some-other-travis-repo-name
    path: path/to/.travis.yml

Dry run example

In this example, GitHub Actions Importer uses the specified YAML configuration file as the source file to perform a dry run.

The pipeline is selected by matching the repository_slug in the configuration file to the value of the --travis-ci-repository option. The path is then used to pull the specified source file.

gh actions-importer dry-run travis-ci --travis-ci-repository travis-org-name/travis-repo-name --output-dir ./output/ --config-file-path ./path/to/travis-ci/config.yml

Supported project languages

GitHub Actions Importer supports migrating Travis CI projects in the following languages.

android
bash
c
clojure
c++
crystal
c#
d
dart
elixir
erlang
generic
go
groovy
haskell
haxe
java
julia
matlab
minimal
nix
node_js
objective-c
perl
perl6
php
python
r
ruby
rust
scala
sh
shell
smalltalk
swift

Supported syntax for Travis CI pipelines

The following table shows the type of properties GitHub Actions Importer is currently able to convert. For more details about how Travis CI pipeline syntax aligns with GitHub Actions, see "Migrating from Travis CI to GitHub Actions".

Travis CI	GitHub Actions	Status
branches	`on.<push>.<branches>`	Supported
build_pull_requests	`on.<pull_request>`	Supported
env	`env` `jobs.<job_id>.env` `jobs.<job_id>.steps.env`	Supported
if	`jobs.<job_id>.if`	Supported
job	`jobs.<job_id>` `jobs.<job_id>.name`	Supported
matrix	`jobs.<job_id>.strategy` `jobs.<job_id>.strategy.fail-fast` `jobs.<job_id>.strategy.matrix`	Supported
os & dist	`runners`	Supported
scripts	`jobs.<job_id>.steps`	Supported
stages	`jobs`	Supported
env	`on`	Partially supported
branches	`on.<push>.<tags>` `on.<push>.paths`	Unsupported
build_pull_requests	`on.<pull_request>.<branches>` `on.<pull_request>.<tags>` `on.<pull_request>.paths`	Unsupported
cron triggers	`on.schedule` `on.workflow_run`	Unsupported
env	`jobs.<job_id>.timeout-minutes` `on.<event_name>.types`	Unsupported
job	`jobs.<job_id>.container`	Unsupported
os & dist	`self hosted runners`	Unsupported

For information about supported Travis CI constructs, see the github/gh-actions-importer repository.

Environment variables syntax

GitHub Actions Importer uses the mapping in the table below to convert default Travis CI environment variables to the closest equivalent in GitHub Actions.

Travis CI	GitHub Actions
`$CONTINUOUS_INTEGRATION`	`$CI`
`$USER`	`${{ github.actor }}`
`$HOME`	`${{ github.workspace }}`
`$TRAVIS_BRANCH`	`${{ github.ref }}`
`$TRAVIS_BUILD_DIR`	`${{ github.workspace }}`
`$TRAVIS_BUILD_ID`	`${{ github.run_number }}`
`$TRAVIS_BUILD_NUMBER`	`${{ github.run_id }}`
`$TRAVIS_COMMIT`	`${{ github.sha }}`
`$TRAVIS_EVENT_TYPE`	`${{ github.event_name }}`
`$TRAVIS_PULL_REQUEST_BRANCH`	`${{ github.base_ref }}`
`$TRAVIS_PULL_REQUEST`	`${{ github.event.number }}`
`$TRAVIS_PULL_REQUEST_SHA`	`${{ github.head.sha }}`
`$TRAVIS_PULL_REQUEST_SLUG`	`${{ github.repository }}`
`$TRAVIS_TAG`	`${{ github.ref }}`
`$TRAVIS_OS_NAME`	`${{ runner.os }}`
`$TRAVIS_JOB_ID`	`${{ github.job }}`
`$TRAVIS_REPO_SLUG`	`${{ github.repository_owner/github.repository }}`
`$TRAVIS_BUILD_WEB_URL`	`${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}`

Legal notice

Portions have been adapted from https://github.com/github/gh-actions-importer/ under the MIT license:

MIT License

Copyright (c) 2022 GitHub

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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SOFTWARE.

GitHub Actions Importer を使った Travis CI からの移行

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