[Bug #19340] Fix bundle gems with test revision

Build temporary gem package from cloned repository if test revision is
set.

common.mk

@@ -1402,10 +1402,10 @@ extract-gems$(gnumake:yes=-sequential): PHONY
 	    -e 'gem, ver, _, rev = *$$F' \
 	    -e 'next if !ver or /^#/=~gem' \
 	    -e 'g = "#{gem}-#{ver}"' \
-	    -e 'if File.directory?("#{d}/#{g}")' \
-	    -e 'elsif rev and File.exist?(gs = "gems/src/#{gem}/#{gem}.gemspec")' \
-	    -e   'BundledGem.copy(gs, ".bundle")' \
-	    -e 'else' \
+	    -e 'unless File.directory?("#{d}/#{g}")' \
+	    -e   'if rev and File.exist?(gs = "gems/src/#{gem}/#{gem}.gemspec")' \
+	    -e     'BundledGem.build(gs, ver, "gems")' \
+	    -e   'end' \
 	    -e   'BundledGem.unpack("gems/#{g}.gem", ".bundle")' \
 	    -e 'end' \
 	    gems/bundled_gems

defs/gmake.mk

@@ -326,27 +326,28 @@ $(srcdir)/.bundle/gems/%: $(srcdir)/gems/%.gem | .bundle/gems
 	    -Itool/lib -rbundled_gem \
 	    -e 'BundledGem.unpack("gems/$(@F).gem", ".bundle")'
 
-define copy-gem
+define build-gem
 $(srcdir)/gems/src/$(1): | $(srcdir)/gems/src
 	$(ECHO) Cloning $(4)
 	$(Q) $(GIT) clone $(4) $$(@)
 
-$(srcdir)/.bundle/gems/$(1)-$(2): | $(srcdir)/gems/src/$(1) .bundle/gems
-	$(ECHO) Copying $(1)@$(3) to $$(@F)
+.PHONY: $(srcdir)/gems/$(1)-$(2).gem
+$(srcdir)/gems/$(1)-$(2).gem: | $(srcdir)/gems/src/$(1)
+	$(ECHO) Building $(1)@$(3) to $$(@F)
 	$(Q) $(CHDIR) "$(srcdir)/gems/src/$(1)" && \
 	    $(GIT) fetch origin $(3) && \
 	    $(GIT) checkout --detach $(3) && \
 	:
 	$(Q) $(BASERUBY) -C "$(srcdir)" \
 	    -Itool/lib -rbundled_gem \
-	    -e 'BundledGem.copy("gems/src/$(1)/$(1).gemspec", ".bundle")'
+	    -e 'BundledGem.build("gems/src/$(1)/$(1).gemspec", "$(2)", "gems")'
 
 endef
-define copy-gem-0
-$(eval $(call copy-gem,$(1),$(2),$(3),$(4)))
+define build-gem-0
+$(eval $(call build-gem,$(1),$(2),$(3),$(4)))
 endef
 
-$(call foreach-bundled-gems-rev,copy-gem-0)
+$(call foreach-bundled-gems-rev,build-gem-0)
 
 $(srcdir)/gems/src:
 	$(MAKEDIRS) $@

tool/lib/bundled_gem.rb

@@ -14,6 +14,19 @@ module BundledGem
     puts "Unpacked #{file}"
   end
 
+  def build(gemspec, version, outdir = ".", validation: true)
+    outdir = File.expand_path(outdir)
+    gemdir, gemfile = File.split(gemspec)
+    Dir.chdir(gemdir) do
+      spec = Gem::Specification.load(gemfile)
+      abort "Failed to load #{gemspec}" unless spec
+      abort "Unexpected version #{spec.version}" unless spec.version == Gem::Version.new(version)
+      output = File.join(outdir, spec.file_name)
+      FileUtils.rm_rf(output)
+      Gem::Package.build(spec, validation == false, validation, output)
+    end
+  end
+
   def copy(path, *rest)
     path, n = File.split(path)
     spec = Dir.chdir(path) {Gem::Specification.load(n)} or raise "Cannot load #{path}"