#!/usr/bin/env bash
# Install or update the gitlab-runner binary on a base VM that jobs' VMs are
# copied from. From https://exe.dev/deploy/gitlab-runner. Jobs need it on
# their PATH for caches and artifacts; nothing here registers or starts a
# runner, so copies of this VM never ask GitLab for jobs themselves.
set -euo pipefail

dl=https://s3.dualstack.us-east-1.amazonaws.com/gitlab-runner-downloads/latest
cd "$(mktemp -d)"
curl -fsSL -o gitlab-runner-linux-amd64 "$dl/binaries/gitlab-runner-linux-amd64"
curl -fsSL "$dl/release.sha256" \
  | awk '$2 == "binaries/gitlab-runner-linux-amd64" {print $1 "  gitlab-runner-linux-amd64"}' \
  | sha256sum -c -
sudo install -m 755 gitlab-runner-linux-amd64 /usr/local/bin/gitlab-runner

# Git LFS, which GitLab Runner expects next to git.
command -v git-lfs >/dev/null ||
  sudo DEBIAN_FRONTEND=noninteractive apt-get install -y -qq git-lfs >/dev/null 2>&1
# Containers in jobs: start Docker with the VM rather than on first use.
sudo systemctl enable --now docker.service >/dev/null 2>&1
mkdir -p ~/builds ~/cache
sync
gitlab-runner --version | head -1