CircleCI で hubコマンド (GitHub CLI) をインストールする方法

結論

以下のような config.yml を書きます。

version: 2
jobs:
  build:
    docker:
      - image: circleci/ruby:2.6.5
    working_directory: ~/repo
    steps:
（省略）
      - run:
          name: Install hub command 2.13.0
          command: |
            cd /tmp && wget https://github.com/github/hub/releases/download/v2.13.0/hub-linux-amd64-2.13.0.tgz
            tar xzf hub-linux-amd64-2.13.0.tgz
            cd hub-linux-amd64-2.13.0
            sudo ./install
      - run:
          name: Check whether hub command has been installed or not
          command: |
            hub --version
            which hub

上記によるコンソールの出力

上記のコマンド群が実行されると以下のようにコンソールに出力されます。ローカルの CLI で CircleCI を走らせた場合です。

====>> Install hub command 2.13.0
  #!/bin/bash -eo pipefail
cd /tmp && wget https://github.com/github/hub/releases/download/v2.13.0/hub-linux-amd64-2.13.0.tgz
tar xzf hub-linux-amd64-2.13.0.tgz
cd hub-linux-amd64-2.13.0
sudo ./install

--2019-11-21 06:21:13--  https://github.com/github/hub/releases/download/v2.13.0/hub-linux-amd64-2.13.0.tgz
Resolving github.com (github.com)... 52.69.186.44
Connecting to github.com (github.com)|52.69.186.44|:443... connected.
HTTP request sent, awaiting response... 302 Found
Location: https://github-production-release-asset-2e65be.s3.amazonaws.com/401025/b3445500-00b2-11ea-8cb5-c17a75fea13f?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIWNJYAX4CSVEH53A%2F20191121%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20191121T062114Z&X-Amz-Expires=300&X-Amz-Signature=82f447660799b23ab6df380f23fc9191a42be7418bba8fd896be74636198291a&X-Amz-SignedHeaders=host&actor_id=0&response-content-disposition=attachment%3B%20filename%3Dhub-linux-amd64-2.13.0.tgz&response-content-type=application%2Foctet-stream [following]
--2019-11-21 06:21:14--  https://github-production-release-asset-2e65be.s3.amazonaws.com/401025/b3445500-00b2-11ea-8cb5-c17a75fea13f?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIWNJYAX4CSVEH53A%2F20191121%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20191121T062114Z&X-Amz-Expires=300&X-Amz-Signature=82f447660799b23ab6df380f23fc9191a42be7418bba8fd896be74636198291a&X-Amz-SignedHeaders=host&actor_id=0&response-content-disposition=attachment%3B%20filename%3Dhub-linux-amd64-2.13.0.tgz&response-content-type=application%2Foctet-stream
Resolving github-production-release-asset-2e65be.s3.amazonaws.com (github-production-release-asset-2e65be.s3.amazonaws.com)... 54.231.49.170
Connecting to github-production-release-asset-2e65be.s3.amazonaws.com (github-production-release-asset-2e65be.s3.amazonaws.com)|54.231.49.170|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 5094920 (4.9M) [application/octet-stream]
Saving to: ‘hub-linux-amd64-2.13.0.tgz’

hub-linux-amd64-2.1 100%[===================>]   4.86M  3.42MB/s    in 1.4s

2019-11-21 06:21:16 (3.42 MB/s) - ‘hub-linux-amd64-2.13.0.tgz’ saved [5094920/5094920]

====>> Check whether hub command has been installed or not
  #!/bin/bash -eo pipefail
hub --version
which hub

git version 2.20.1
hub version 2.13.0
/usr/local/bin/hub
Success!

補足

• tarball を落として展開する場所は上記では /tmp ですが、まあ一時的なのでどこでも構いません
• ./install を実行することで hub がインストールされます
  • インストールされる場所は /usr/local/bin/hub です
  • したがって、./install の実行の際には sudo が必要です
• 上記ではバージョンが 2.13.0 で決め打ちしていますので、適宜バージョン番号を変更しましょう