helloworld & helloweb: Go version

We added support for Go in the previous patch. Let's now illustrate how
to use the toolchain and build simple service based on it.

/cc @gabriel, @Camata

component/helloweb/buildout.cfg

@@ -3,10 +3,12 @@
 extends =
   ../git/buildout.cfg
   ../ruby/buildout.cfg
+  ../golang/buildout.cfg
 
 parts =
   helloweb-python
   helloweb-ruby
+  helloweb-go
 
 
 # repository with examples
@@ -14,7 +16,7 @@ parts =
 recipe  = slapos.recipe.build:gitclone
 git-executable = ${git:location}/bin/git
 repository = https://lab.nexedi.com/nexedi/helloweb.git
-revision = 7f5e49a541ae7b51da034dcdf20b91b64f4fb0e9
+revision = 0487fa7bc88e83ce8b97d784ab11354aa8fac603
 location = ${buildout:parts-directory}/helloweb
 
 
@@ -78,3 +80,17 @@ environment  =
     BUNDLE_GEMFILE = ${helloweb-ruby-bundle:path}/Gemfile
 command-line =
     ${bundler:bundle} exec sh -c 'helloweb.rb "$@"' ${:_buildout_section_name_}
+
+
+# -*- go -*-
+[helloweb-go]
+recipe  = slapos.recipe.cmmi
+path    = ${helloweb-repository:location}/go/
+
+go      = ${golang15:location}/bin/go
+configure-command = :
+make-binary =
+make-targets= cd ${:path} &&
+     ${:go} build
+        -o ${buildout:bin-directory}/${:_buildout_section_name_}
+        helloweb.go

software/helloworld/instance.cfg.in

@@ -110,6 +110,7 @@ port    = {{ port }}
 # services instantiation
 {{ hellowebsrv('python', 7777) }}
 {{ hellowebsrv('ruby',   7778) }}
+{{ hellowebsrv('go',     7779) }}
 
 
 # register all services/promises to buildout parts

software/helloworld/software.cfg

@@ -22,6 +22,7 @@ parts =
 # build helloweb programs
   helloweb-python
   helloweb-ruby
+  helloweb-go
 
 
 # Download instance.cfg.in (buildout profile used to deployment of instance),
@@ -32,7 +33,7 @@ recipe = slapos.recipe.template:jinja2
 template = ${:_profile_base_location_}/instance.cfg.in
 rendered = ${buildout:directory}/instance.cfg
 # MD5 checksum can be skipped for development (easier to develop), but must be filled for production
-md5sum = be7f930921376b3c8eb51c975e24721f
+md5sum = 6567f8dedb5cdd93542dc29e96edb547
 mode = 0644
 extensions = jinja2.ext.do
 context =