action.yaml

# Copyright (c) Tailscale Inc & AUTHORS
# SPDX-License-Identifier: BSD-3-Clause
#
name: 'Connect Tailscale'
description: 'Connect your GitHub Action workflow to Tailscale'
branding:
  icon: 'arrow-right-circle'
  color: 'gray-dark'
inputs:
  authkey:
    description: 'Your Tailscale authentication key, from the admin panel.'
    required: false
    deprecationMessage: 'An OAuth API client https://tailscale.com/s/oauth-clients is recommended instead of an authkey'
  oauth-client-id:
    description: 'Your Tailscale OAuth Client ID.'
    required: false
  oauth-secret:
    description: 'Your Tailscale OAuth Client Secret.'
    required: false
  tags:
    description: 'Comma separated list of Tags to be applied to nodes. The OAuth client must have permission to apply these tags.'
    required: false
  version:
    description: 'Tailscale version to use.'
    required: true
    default: '1.68.1'
  sha256sum:
    description: 'Expected SHA256 checksum of the tarball.'
    required: false
    default: '18edc3067c41bfbcd6eeffeab45d93e10566219cb0ebb78a0f59eba56acc37e3'
  containerMode:
    description: 'This mode will use the Userspace networking mode (specially for container where tunnel VPN is not possible). DEPRECATED, not used anymore'
    type: boolean
    required: false
    default: true
  debug:
    description: 'This mode generate the tailscale bug report'
    type: boolean
    required: false
    default: false
  debugEnabled:
    description: 'This mode will allow to SSH to the runner. DEPRECATED, not used, replaced by github runner variable'
    type: boolean
    required: false
    default: false
  acceptDns:
    description: ''
    type: boolean
    required: false
    default: true
  acceptRoutes:
    description: ''
    type: boolean
    required: false
    default: true
  slackChannel:
    description: 'Provide Slack Channel to send SSH information'
    type: string
    required: false
  slackToken:
    description: 'Slack Token to send message'
    type: string
    required: false
  waitForSSH:
    description: 'You can use this action at the end of your job with waitForSSH=true to handle SSH connection in case of workflow failed'
    type: boolean
    required: false
    default: false
  sshTimeout:
    description: 'Number of minute to wait for SSH connection before ending the job'
    type: string
    required: false
    default: "5m"
  sshKeyId:
    description: 'Internal usage. when the SSH Key changed on tailscale, please update the default value. Its in use in this action, to take the following decisions'
    # - if this key is used on the WF, and debug mode is not enabled during action run, no need to connect to tailscale
    # - if tailscale is used for something else than SSH (like internal ressources access), so we are testing internal url access.
    type: string
    required: false
    default: "tskey-auth-kBgJJWKh3311CNTRL"
runs:
    using: 'composite'
    steps:
      - name: Check Runner OS
        if: ${{ runner.os != 'Linux' }}
        shell: bash
        run: |
          echo "::error title=⛔ error hint::Support Linux Only"
          exit 1
      - name: check debug
        #if: ${{ runner.debug == '1' }}
        shell: bash
        run: |
          if [ "${{ runner.debug }}" = "1" ]; then
            echo "debug"
          else
            echo "no debug"
          fi
          
      - name: Check Tailscale Action Usage mode (waitForSSH or Normal)
        id: tailscale-mode
        shell: bash
        run: |
          #if waitForSSH is enabled, we need to check if Tailscale is already connected or not (this parameter must be used for debugging usage when a step of worklfow failed)
          #if Tailscale is already connected, it means the action was already called at the start of the WF with all mandatory inputs, we just need to enable SSH and wait for connection.
          #if Tailscale is not yet connected, we need to execute the entire action (aka setup tailscale) and wait for SSH at the end
          if [ "${{ inputs['waitForSSH'] }}" = true ]; then
            if ! command -v tailscale &> /dev/null
            then
              echo "INSTALL=true"  >> $GITHUB_OUTPUT
              echo "WITHSSH=true"  >> $GITHUB_OUTPUT
              echo "WAITFORSSH=true"  >> $GITHUB_OUTPUT
            else
              echo "INSTALL=false"  >> $GITHUB_OUTPUT
              echo "WITHSSH=true"  >> $GITHUB_OUTPUT
              echo "WAITFORSSH=true"  >> $GITHUB_OUTPUT
            fi
          else
            #if Debug is not enabled, so we need to check why this action is called by checking AUTH_KEY : if the workflow is using SSH'ed key, and debug is not enabled, no need to execute Tailscale
            if [ "${{ runner.debug }}" = "1" ]; then #debug enabled, so connect to tailscale with SSH
              echo "INSTALL=true"  >> $GITHUB_OUTPUT
              echo "WITHSSH=true"  >> $GITHUB_OUTPUT
              echo "WAITFORSSH=false"  >> $GITHUB_OUTPUT
            else
              if [[ "${{ inputs['authkey'] }}" =~ "${{ inputs['sshKeyId'] }}" ]]; then  #debug not enabled, so if the Key is the SSH'ed one, no need to execute tailscale 
                echo "INSTALL=false"  >> $GITHUB_OUTPUT
                echo "WITHSSH=false"  >> $GITHUB_OUTPUT
                echo "WAITFORSSH=false"  >> $GITHUB_OUTPUT
              else #debug not enable, but need to execute tailscale because it's standard Tailscale Key
                echo "INSTALL=true"  >> $GITHUB_OUTPUT
                echo "WITHSSH=false"  >> $GITHUB_OUTPUT
                echo "WAITFORSSH=false"  >> $GITHUB_OUTPUT
              fi
            fi
          fi     
      - name: Check Auth Info Empty
        if: ${{ steps.tailscale-mode.outputs.INSTALL == 'true' && inputs.authkey == '' && (inputs['oauth-secret'] == '' || inputs.tags == '') }}
        shell: bash
        run: |
          echo "::error title=⛔ error hint::OAuth identity empty, Maybe you need to populate it in the Secrets for your workflow, see more in https://docs.github.com/en/actions/security-guides/encrypted-secrets and https://tailscale.com/s/oauth-clients"
          exit 1
          
      - name: Install prerequistes
        if: ${{ steps.tailscale-mode.outputs.INSTALL == 'true' }}
        shell: bash
        run: |
            if ! command -v sudo &> /dev/null
            then
                apt-get update
                apt-get install -y sudo
            else
                sudo apt-get update
            fi
            sudo apt-get install -y curl iptables
            
      - name: Download Tailscale
        if: ${{ steps.tailscale-mode.outputs.INSTALL == 'true' }}
        shell: bash
        id: download
        env:
          VERSION: ${{ inputs.version }}
          SHA256SUM: ${{ inputs.sha256sum }}
        run: |
          if [ ${{ runner.arch }} = "ARM64" ]; then
            TS_ARCH="arm64"
          elif [ ${{ runner.arch }} = "ARM" ]; then
            TS_ARCH="arm"
          elif [ ${{ runner.arch }} = "X86" ]; then
            TS_ARCH="386"
          elif [ ${{ runner.arch }} = "X64" ]; then
            TS_ARCH="amd64"
          else
            TS_ARCH="amd64"
          fi
          MINOR=$(echo "$VERSION" | awk -F '.' {'print $2'})
          if [ $((MINOR % 2)) -eq 0 ]; then
            URL="https://pkgs.tailscale.com/stable/tailscale_${VERSION}_${TS_ARCH}.tgz"
          else
            URL="https://pkgs.tailscale.com/unstable/tailscale_${VERSION}_${TS_ARCH}.tgz"
          fi
          if ! [[ "$SHA256SUM" ]] ; then
            SHA256SUM="$(curl -H user-agent:tailscale-github-action -L "${URL}.sha256")"
          fi
          curl -H user-agent:tailscale-github-action -L "$URL" -o tailscale.tgz --max-time 300
          echo "Expected sha256: $SHA256SUM"
          echo "Actual sha256: $(sha256sum tailscale.tgz)"
          echo "$SHA256SUM  tailscale.tgz" | sha256sum -c
          tar -C /tmp -xzf tailscale.tgz
          rm tailscale.tgz
          TSPATH=/tmp/tailscale_${VERSION}_${TS_ARCH}
          sudo mv "${TSPATH}/tailscale" "${TSPATH}/tailscaled" /usr/bin
          
      - name: Start Tailscale Daemon
        if: ${{ steps.tailscale-mode.outputs.INSTALL == 'true' }}
        shell: bash
        run: |
          sudo mkdir -p /dev/net
          if [ ! -e /dev/net/tun ]
          then
            sudo mknod /dev/net/tun c 10 200
          fi
          sudo -E tailscaled --state=mem: 2>~/tailscaled.log &
          # And check that tailscaled came up. The CLI will block for a bit waiting
          # for it. And --json will make it exit with status 0 even if we're logged
          # out (as we will be). Without --json it returns an error if we're not up.
          sudo -E tailscale status --json >/dev/null
          
      - name: Connect to Tailscale
        if: ${{ steps.tailscale-mode.outputs.INSTALL == 'true' }}
        shell: bash
        env:
          TAILSCALE_AUTHKEY: ${{ inputs.authkey }}
          HOSTNAME: ${{ inputs.hostname }}
          TS_EXPERIMENT_OAUTH_AUTHKEY: true
          DNS: ${{ inputs.acceptDns }}
          ACCEPT_ROUTES: ${{ inputs.acceptRoutes }}
        run: |
          if [ -z "${HOSTNAME}" ]; then
            HOSTNAME="github-$(cat /etc/hostname)"
          fi
          if [ -n "${{ inputs['oauth-secret'] }}" ]; then
            TAILSCALE_AUTHKEY="${{ inputs['oauth-secret'] }}?preauthorized=true&ephemeral=true"
            TAGS_ARG="--advertise-tags=${{ inputs.tags }}"
          fi
          timeout 5m sudo -E tailscale up ${TAGS_ARG} --authkey=${TAILSCALE_AUTHKEY} --hostname=${HOSTNAME} --accept-dns=${DNS} --accept-routes=${ACCEPT_ROUTES} ${ADDITIONAL_ARGS}
          
      #we don't need network test anymore, because we are not using tailscale on CI for accessing registry    
      #- name: Network Test
      #  if: ${{ steps.tailscale-mode.outputs.INSTALL == 'true' }}
      #  shell: bash
      #  run: |
      #    if  [[ "${{ inputs['authkey'] }}" =~ "${{ inputs['sshKeyId'] }}" ]]; then 
      #      url=https://status.taildb5d.ts.net/status/default
      #    else
      #      url=https://registry.internal.huggingface.tech
      #    fi
      #    echo $url
      #    curl --head -X GET --retry 30 --retry-connrefused --retry-delay 1 $url
      #    echo "WAN IP:"
      #    curl ifconfig.me/ip
      - name: Store Slack infos
        #because the SSH can be enabled dynamically if the workflow failed, so we need to store slack infos to be able to retrieve them during the waitforssh step
        if: ${{  inputs.slackChannel != '' }}
        shell: bash
        run: |
          echo "SLACKCHANNEL=${{ inputs['slackChannel'] }}" >> $GITHUB_ENV
          echo "SLACKTOKEN=${{ inputs['slackToken'] }}" >> $GITHUB_ENV
      - name: Enable SSH
        id: ssh
        if: ${{ steps.tailscale-mode.outputs.WITHSSH == 'true' }}
        shell: bash
        run: |
          sudo apt-get -y install openssh-server >> /dev/null
          sudo tailscale set --ssh
          echo "TS_IP=$(tailscale ip --4)"  >> $GITHUB_OUTPUT
          echo "USER=$(whoami)"  >> $GITHUB_OUTPUT
          echo "warning message content : ${{ inputs['warningMessage'] }}"
          if [ "${{ runner.debug }}" = "1" ]; then
            echo "MESSAGEHEADER=New Job started in debug mode"  >> $GITHUB_OUTPUT
          else
            echo "MESSAGEHEADER=:x:JOB FAILED !"  >> $GITHUB_OUTPUT
          fi
      - name: Send SSH informations to Slack channel
        if: ${{ steps.tailscale-mode.outputs.WITHSSH == 'true' && env.SLACKCHANNEL != '' }}
        uses: slackapi/slack-github-action@6c661ce58804a1a20f6dc5fbee7f0381b469e001
        with:
          # Slack channel id, channel name, or user id to post message.
          # See also: https://api.slack.com/methods/chat.postMessage#channels
          channel-id: ${{ env.SLACKCHANNEL }}
          # For posting a rich message using Block Kit
          payload: |
            {
              "blocks": [
                {
                  "type": "header",
                  "text": {
                    "type": "plain_text",
                    "text": "${{ steps.ssh.outputs.MESSAGEHEADER }}",
                    "emoji": true
                  }
                },
                {
                  "type": "section",
                  "fields": [
                    {
                      "type": "mrkdwn",
                      "text": "*Repository:*\n `${{ github.repository }}`"
                    },
                    {
                      "type": "mrkdwn",
                      "text": "*Workflow:*\n `${{ github.workflow }}`"
                    },
                    {
                      "type": "mrkdwn",
                      "text": "*Started by:*\n ${{ github.actor }}"
                    },
                    {
                      "type": "mrkdwn",
                      "text": "*Job:*\n `${{ github.job}}`"
                    }
                  ]
                },
                {
                  "type": "section",
                  "text": {
                    "type": "mrkdwn",
                    "text": "start your VPN (tailscale) and : `ssh ${{ steps.ssh.outputs.USER }}@${{ steps.ssh.outputs.TS_IP }} `"
                  }
                }
              ]
            }
        env:
          SLACK_BOT_TOKEN: ${{ env.SLACKTOKEN }}
      
      - name: Wait for SSH
        if: ${{ steps.tailscale-mode.outputs.WAITFORSSH == 'true' }}
        shell: bash
        run: |
            sleep "${{ inputs['sshTimeout'] }}"
            while [ "$(last | grep '^\(ubuntu\|runner\|root\).*still logged in$')" ]; do sleep 1m; done