shared cmmi TODO: apache apr and slapos.recipe.build:download-unpacked

Because apr / apr-util are using slapos.recipe.build:download-unpacked
(which does not use shared cache), they cannot be cached.

We workaround this by using slapos.recipe.ccmi without actually
compiling, but just copying the files to the expected location.

component/apache/buildout.cfg

@@ -17,18 +17,26 @@ extends =
   ../sqlite3/buildout.cfg
   ../zlib/buildout.cfg
 
+
+[apr-download-only]
+recipe = slapos.recipe.cmmi
+shared = true
+# XXX download-only, but benefit from cache of cmmi
+# XXX we probably need a recipe for that
+configure-command = :
+make-binary = cp -ra $(pwd) @@LOCATION@@
+make-targets =
+
 [apr]
-recipe = slapos.recipe.build:download-unpacked
-strip-top-level-dir = false
+<= apr-download-only
+url = https://archive.apache.org/dist/apr/apr-${:version}.tar.bz2
 version = 1.5.2
 md5sum = 4e9769f3349fe11fc0a5e1b224c236aa
-url = https://archive.apache.org/dist/apr/apr-${:version}.tar.bz2
 
 [apr-util]
-recipe = slapos.recipe.build:download-unpacked
-strip-top-level-dir = false
-version = 1.5.4
+<= apr-download-only
 url = https://archive.apache.org/dist/apr/apr-util-${:version}.tar.bz2
+version = 1.5.4
 md5sum = 2202b18f269ad606d70e1864857ed93c
 
 [apache]