build: Accept --patch option to apply patches to the Ruby source

Author: kateinoigakukun

lib/ruby_wasm/cli.rb

@@ -53,7 +53,8 @@ def build(args)
         target_triplet: "wasm32-unknown-wasi",
         profile: "full",
         stdlib: true,
-        disable_gems: false
+        disable_gems: false,
+        patches: [],
       }
       OptionParser
         .new do |opts|
@@ -106,6 +107,10 @@ def build(args)
             options[:disable_gems] = true
           end
 
+          opts.on("-p", "--patch PATCH", "Apply a patch") do |patch|
+            options[:patches] << patch
+          end
+
           opts.on("--format FORMAT", "Output format") do |format|
             options[:format] = format
           end
@@ -174,10 +179,15 @@ def build_config(options)
     def compute_build_source(options)
       src_name = options[:ruby_version]
       aliases = self.class.build_source_aliases(root)
-      aliases[src_name] ||
+      source = aliases[src_name]
+      unless source
         raise(
           "Unknown Ruby source: #{src_name} (available: #{aliases.keys.join(", ")})"
         )
+      end
+      # Apply user-specified patches in addition to <root>/patches.
+      source[:patches].concat(options[:patches])
+      source
     end
 
     # Retrieves the alias definitions for the Ruby sources.
@@ -210,7 +220,10 @@ def self.build_source_aliases(root)
         begin
           manifest = JSON.parse(File.read(build_manifest))
           manifest["ruby_revisions"].each do |name, rev|
-            sources[name][:rev] = rev
+            source = sources[name]
+            next unless source[:type] == "github"
+            # @type var source: RubyWasm::Packager::build_source_github
+            source[:rev] = rev
           end
         rescue StandardError => e
           RubyWasm.logger.warn "Failed to load build_manifest.json: #{e}"

sig/ruby_wasm/cli.rbs

@@ -15,8 +15,10 @@ module RubyWasm
       profile: String,
       stdlib: bool,
       disable_gems: bool,
+      patches: Array[String],
       format: String,
     }
+
     DEFAULT_RUBIES_DIR: string
 
     @stdout: IO

sig/ruby_wasm/packager.rbs

@@ -1,6 +1,23 @@
 
 class RubyWasm::Packager
-  type build_source = Hash[Symbol, (string | Array[String])]
+  type build_source_github = {
+    type: "github",
+    repo: String,
+    rev: String,
+  }
+  type build_source_tarball = {
+    type: "tarball",
+    url: String,
+  }
+  type build_source_local = {
+    type: "local",
+    path: String,
+  }
+  type build_source = (build_source_github | build_source_tarball | build_source_local) & {
+    name: string,
+    patches: Array[String],
+  }
+
   type build_config = Hash[untyped, untyped]
 
   @definition: untyped