tailscale/.github/actions/go-cache/action.sh

#!/usr/bin/env bash
#
# This script sets up cigocacher, but should never fail the build if unsuccessful.
# It expects to run on a GitHub-hosted runner, and connects to cigocached over a
# private Azure network that is configured at the runner group level in GitHub.
#
# Usage: ./action.sh
# Inputs:
#   URL: The cigocached server URL.
#   HOST: The cigocached server host to dial.
# Outputs:
#   success: Whether cigocacher was set up successfully.

set -euo pipefail

if [ -z "${GITHUB_ACTIONS:-}" ]; then
    echo "This script is intended to run within GitHub Actions"
    exit 1
fi

if [ -z "${URL:-}" ]; then
    echo "No cigocached URL is set, skipping cigocacher setup"
    exit 0
fi

GOPATH=$(command -v go || true)
if [ -z "${GOPATH}" ]; then
  if [ ! -f "tool/go" ]; then
    echo "Go not available, unable to proceed"
    exit 1
  fi
  GOPATH="./tool/go"
fi

BIN_PATH="${RUNNER_TEMP:-/tmp}/cigocacher$(${GOPATH} env GOEXE)"
if [ -d "cmd/cigocacher" ]; then
  echo "cmd/cigocacher found locally, building from local source"
  "${GOPATH}" build -o "${BIN_PATH}" ./cmd/cigocacher
else
  echo "cmd/cigocacher not found locally, fetching from tailscale.com/cmd/cigocacher"
  "${GOPATH}" build -o "${BIN_PATH}" tailscale.com/cmd/cigocacher
fi

CIGOCACHER_TOKEN="$("${BIN_PATH}" --auth --cigocached-url "${URL}" --cigocached-host "${HOST}" )"
if [ -z "${CIGOCACHER_TOKEN:-}" ]; then
    echo "Failed to fetch cigocacher token, skipping cigocacher setup"
    exit 0
fi

echo "Fetched cigocacher token successfully"
echo "::add-mask::${CIGOCACHER_TOKEN}"

echo "GOCACHEPROG=${BIN_PATH} --cache-dir ${CACHE_DIR} --cigocached-url ${URL} --cigocached-host ${HOST} --token ${CIGOCACHER_TOKEN}" >> "${GITHUB_ENV}"
echo "success=true" >> "${GITHUB_OUTPUT}"