component/yarn: Make yarn shared

component/yarn/buildout.cfg

@@ -24,14 +24,19 @@ yarn-download = ${yarn-download-1.16.0:location}
 yarn-download = ${yarn-download-1.3.2:location}
 
 [yarn-wrapper]
-recipe = slapos.recipe.template:jinja2
-rendered = ${:location}/bin/yarn
-template = inline:
+recipe = slapos.recipe.build
+shared = true
+content =
   #!/bin/sh
   PATH=${nodejs:location}/bin/:$PATH
   exec ${:yarn-download}/bin/yarn $@
-location = ${buildout:parts-directory}/${:_buildout_section_name_}
-bin-yarn = ${:rendered}
+install =
+  import os
+  bin = os.path.join(options['location'], 'bin')
+  os.makedirs(bin)
+  with open(os.path.join(bin, 'yarn'), 'w') as f:
+    os.fchmod(f.fileno(), 0o755)
+    f.write(options['content'])
 
 [yarn-download]
 recipe = slapos.recipe.build:download-unpacked