# SPDX-License-Identifier: MIT
name: 'Forgejo Actions to setup Go and cache dependencies'
author: 'Forgejo authors'
description: |
  Wrap the setup-go with improved dependency caching.
inputs:
  username:
    description: 'User for which to manage the dependency cache'
    default: root

runs:
  using: "composite"
  steps:
    - name: "Install zstd for faster caching"
      run: |
        apt-get update -qq
        apt-get -q install -qq -y zstd

    - name: "Set up Go using setup-go"
      uses: https://data.forgejo.org/actions/setup-go@v5
      id: go-version
      with:
        go-version-file: "go.mod"
        # do not cache dependencies, we do this manually
        cache: false

    - name: "Get go environment information"
      id: go-environment
      run: |
        chmod 755 $HOME # ensure ${RUN_AS_USER} has permission when go is located in $HOME
        export GOROOT="$(go env GOROOT)"
        echo "modcache=$(su ${RUN_AS_USER} -c '${GOROOT}/bin/go env GOMODCACHE')" >> "$GITHUB_OUTPUT"
        echo "cache=$(su ${RUN_AS_USER} -c '${GOROOT}/bin/go env GOCACHE')" >> "$GITHUB_OUTPUT"
      env:
        RUN_AS_USER: ${{ inputs.username }}
        GO_VERSION: ${{ steps.go-version.outputs.go-version }}

    - name: "Create cache folders with correct permissions (for non-root users)"
      if: inputs.username != 'root'
      # when the cache is restored, only the permissions of the last part are restored
      # so assuming that /home/user exists and we are restoring /home/user/go/pkg/mod,
      # both folders will have the correct permissions, but
      # /home/user/go and /home/user/go/pkg might be owned by root
      run: |
        su ${RUN_AS_USER} -c 'mkdir -p "${MODCACHE_DIR}" "${CACHE_DIR}"'
      env:
        RUN_AS_USER: ${{ inputs.username }}
        MODCACHE_DIR: ${{ steps.go-environment.outputs.modcache }}
        CACHE_DIR: ${{ steps.go-environment.outputs.cache }}

    - name: "Restore Go dependencies from cache or mark for later caching"
      id: cache-deps
      uses: https://data.forgejo.org/actions/cache@v4
      with:
        key: setup-cache-go-deps-${{ runner.os }}-${{ inputs.username }}-${{ steps.go-version.outputs.go_version }}-${{ hashFiles('go.sum', 'go.mod') }}
        restore-keys: |
          setup-cache-go-deps-${{ runner.os }}-${{ inputs.username }}-${{ steps.go-version.outputs.go_version }}-
          setup-cache-go-deps-${{ runner.os }}-${{ inputs.username }}-
        path: |
          ${{ steps.go-environment.outputs.modcache }}
          ${{ steps.go-environment.outputs.cache }}
