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GitHub Documentation Previewer

Web service that publishes a preview of a GitHub project documentation.

The documentation itself has to be built during the project continuous integration and published as a GitHub actions artifact.

Client installation

To be able to use this service in your project, you need to have a CI job that looks like this:

on: [ push, pull_request ]

jobs:
  doc:
    name: Build Documentation
    runs-on: ubuntu-latest
    steps:
      # Instead of this step you may have a step to check out the repository,
      # another to call `sphinx-build`, or anything that generates a directory
      # with the html version of your website or documentation
      - run: mkdir docs_dir && echo "Preview is working!" > docs_dir/index.html

      - uses: actions/upload-artifact@v4
        with:
          name: docs_artifact
          path: docs_dir

Then, you can add one action in your CI to for example publish the website or documentation of a pull request when a user writes a comment with the content /preview:

on:
  issue_comment:
    types: created

jobs:
  previewer:
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
    if: github.event.issue.pull_request && github.event.comment.body == '/preview'
    steps:
      - uses: pandas-dev/github-doc-previewer@master
        with:
          # The server specified here has to explicitly allow your GitHub organization
          previewer-server: "https://pandas.pydata.org"

          # Note that this has to match with the name of the job where the
          # `upload-artifact` action is called
          artifact-job: "Build Documentation"

Server Installation

Currently only packages for Debian are provided. The package can be installed using the next command:

curl -sLO https://github.com/pandas-dev/github-doc-previewer/releases/download/v0.3.1/doc-previewer_0.3.1-1_amd64.deb \
    && sudo dpkg -i doc-previewer_0.3.1-1_amd64.deb \
    && rm doc-previewer_0.3.1-1_amd64.deb

To start the service:

sudo systemctl enable doc-previewer.service
sudo systemctl start doc-previewer.service

Configuration

A sample configuration file is next:

previews_path = "/var/doc-previewer"
retention_days = 14
max_artifact_size = 524288000

[server]
address = "0.0.0.0"
port = 8000
url = "https://doc-previewer.pydata.org/"

[github]
entrypoint = "https://api.github.com/repos/"
token = "xxxxx"
allowed_owners = [ "pandas-dev", "pydata" ]

[log]
level = "info"

All the fields are optional except for the GitHub token, which is required.

Logging

When a problem exists, the service will in general report it to the client. Checking the logs of the github-doc-previewer action run that failed may provide information on the cause of the problem. Errors will also be logged in the server, and can be checked using the standard journal logs:

journalctl -u doc-previewer.service