Cache ./rubies directory on CI

Author: kateinoigakukun

.github/workflows/build.yml

@@ -88,6 +88,11 @@ jobs:
       entries: ${{ steps.set-matrix.outputs.entries }}
     steps:
       - uses: actions/checkout@v3
+      - run: rake ci:pin_build_manifest
+      - uses: actions/upload-artifact@v3
+        with:
+          name: build-manifest
+          path: build-manifest.json
       - name: Set matrix
         id: set-matrix
         run: |
@@ -103,6 +108,13 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v3
+      - uses: actions/download-artifact@v3
+        with:
+          name: build-manifest
+      - uses: actions/cache@v3
+        with:
+          path: ./rubies
+          key: ${{ matrix.entry.rubies_cache_key }}
       - name: Fetch builder image
         uses: actions/download-artifact@v3
         with:

lib/ruby_wasm/build_system/product/ruby_source.rb

@@ -11,6 +11,17 @@ def name
       @params[:name]
     end
 
+    def cache_key
+      case @params[:type]
+      when "github"
+        @params[:rev]
+      when "local"
+        File.mtime(@params[:src]).to_i.to_s
+      else
+        raise "unknown source type: #{@params[:type]}"
+      end
+    end
+
     def src_dir
       File.join(@build_dir, "checkouts", @params[:name])
     end

lib/ruby_wasm/rake_task.rb

@@ -92,7 +92,7 @@ def initialize(
   def hexdigest
     require "digest"
     digest = Digest::SHA256.new
-    digest << @source.name
+    digest << @source.cache_key
     digest << @build_dir
     digest << @rubies_dir
     digest << @target

tasks/ci.rake

@@ -13,12 +13,17 @@ end
 namespace :ci do
   task :rake_task_matrix do
     require "pathname"
+    ruby_cache_keys = {}
+    BUILD_TASKS.each do |build|
+      ruby_cache_keys[build.name] = build.hexdigest
+    end
     entries = BUILD_TASKS.map do |build|
       {
         task: "build:#{build.name}",
         artifact: Pathname.new(build.crossruby.artifact).relative_path_from(LIB_ROOT).to_s,
         artifact_name: File.basename(build.crossruby.artifact, ".tar.gz"),
         builder: build.target,
+        rubies_cache_key: ruby_cache_keys[build.name],
       }
     end
     entries += NPM_PACKAGES.map do |pkg|
@@ -29,6 +34,7 @@ namespace :ci do
         artifact: "packages/npm-packages/#{pkg[:name]}/#{pkg[:name]}-*.tgz",
         artifact_name: "npm-#{pkg[:name]}",
         builder: pkg[:target],
+        rubies_cache_key: ruby_cache_keys[pkg[:build]],
       }
     end
     entries += WAPM_PACKAGES.map do |pkg|
@@ -37,12 +43,13 @@ namespace :ci do
         artifact: "packages/wapm-packages/#{pkg[:name]}/dist",
         artifact_name: "wapm-#{pkg[:name]}",
         builder: "wasm32-unknown-wasi",
+        rubies_cache_key: ruby_cache_keys[pkg[:build]],
       }
     end
     print JSON.generate(entries)
   end
 
-  task :build_manifest do
+  task :pin_build_manifest do
     content = JSON.generate({ ruby_revisions: latest_build_sources })
     File.write("build_manifest.json", content)
   end