slapos/obs.cfg: supports the newer version of cmmi and add some comments

component/slapos/obs.cfg

 [buildout]
 # You need to define rootdir and destdir on an upper level
+#
+# rootdir is where the parts will be installed by the debian package (e.g. /opt/slapos)
+# destdir is where we can put the files during compilation (e.g. /tmp/build-slapos)
+# buildout MUST BE launched in $destdir/$rootdir (this is enforced by an assert)
+#
+# in this file, we teach many packages to use prefix = $rootdir/parts/package and we
+# set DESTDIR = $destdir so in reality the files land in $destdir/$rootdir/parts/package
+# which is EXACTLY what cmmi recipe uses by default (buildout run dir/parts/package)
+# that's why everything is working
+#
+# please be careful when touching this file
+
 #rootdir = %TARGET_DIRECTORY%
-#destdir = %BUILD_ROOT_DIRECTORY% 
-#builddir = %BUILD_DIRECTORY%
+#destdir = %BUILD_ROOT_DIRECTORY%
+
 extends =
   buildout.cfg
 
@@ -13,34 +25,24 @@ extensions =
 extends-cache = extends-cache
 download-cache = download-cache
 
-# Uguu, upstream buildout.cfg must be patched as it works the other way
-# around from a packager point of view at least, thus at the end static
-# path, such as Python HOME directory, are wrong...
-#
-# Currently:
-# ./configure --prefix=BUILD_DIRECTORY && make install
-# Instead of:
-# ./configure --prefix=INSTALL_DIRECTORY && make install DESTDIR=BUILD_DIRECTORY
+[python]
+init +=
+  buildout = self.buildout['buildout']
+  assert buildout['directory'] == buildout['destdir'] + buildout['rootdir'], (
+    "Buildout MUST BE launched in destdir/rootdir (currently launched in %s but should be launched in %s)",
+	 buildout['directory'], buildout['destdir'] + buildout['rootdir'])
+
 [python2.7]
 configure-options +=
   --prefix=${buildout:rootdir}/parts/${:_buildout_section_name_}
 environment +=
   DESTDIR=${buildout:destdir}
 
-[gettext]
-# Add gettext library path to RPATH as its binaries are used to build
-# glib for example
-environment =
-  PATH=${perl:location}/bin:${lunzip:location}/bin:%(PATH)s
-  CPPFLAGS=-I${libxml2:location}/include -I${zlib:location}/include -I${ncurses:location}/include
-  LDFLAGS=-L${libxml2:location}/lib -Wl,-rpath=${libxml2:location}/lib -L${zlib:location}/lib -Wl,-rpath=${zlib:location}/lib -L${ncurses:location}/lib -Wl,-rpath=${ncurses:location}/lib -Wl,-rpath=${buildout:builddir}/parts/${:_buildout_section_name_}/lib
-
 [bison]
 configure-options +=
   --prefix=${buildout:rootdir}/parts/${:_buildout_section_name_}
 make-options +=
   DESTDIR=${buildout:destdir}
-
 environment +=
   PERL5LIB=${perl:location}/lib/5.28.1/
 
@@ -62,7 +64,6 @@ environment +=
 
 
 [dbus]
-location = ${buildout:parts-directory}/${:_buildout_section_name_}
 configure-options +=
   --prefix=${buildout:rootdir}/parts/${:_buildout_section_name_}
 make-options +=
@@ -74,7 +75,6 @@ post-install =
   mkdir -p ${buildout:destdir}/parts/${:_buildout_section_name_}/var/run/dbus
 
 [dbus-glib]
-location = ${buildout:parts-directory}/${:_buildout_section_name_}
 environment +=
   LD_LIBRARY_PATH=${dbus:location}/lib
   DBUS_CFLAGS=-I${dbus:location}/include/dbus-1.0 -I${dbus:location}/lib/dbus-1.0/include
@@ -92,21 +92,13 @@ post-install =
   sed -i 's#${dbus:location}/lib/libdbus-1.la#/opt/slapos/parts/dbus/lib/libdbus-1.la#' ${dbus-glib:location}/lib/libdbus-glib-1.la
 
 [openssl]
+shared = false
 prefix = ${buildout:rootdir}/parts/${:_buildout_section_name_}
-location = ${buildout:parts-directory}/${:_buildout_section_name_}
 make-options +=
   INSTALL_PREFIX=${buildout:destdir}
   DESTDIR=${buildout:destdir}
- 
-environment =
+environment +=
   PERL5LIB=${perl:location}/lib/5.28.1/
-  PERL=${perl:location}/bin/perl
-
-[bison-go]
-<= bison
-configure-options =
-  --prefix=${buildout:parts-directory}/${:_buildout_section_name_}
-make-options =
 
 [gobject-introspection]
 pre-configure =
@@ -115,10 +107,8 @@ configure-options +=
   --enable-shared
 environment +=
   PERL5LIB=${perl:location}/lib/5.28.1/
-
-post-install = 
+post-install =
   sed -i 's#!${python:location}/bin/python${python:version}#!/opt/slapos/parts/python${python:version}/bin/python${python:version}#' ${python:location}/bin/python${python:version}-config
-  rm -rf ${bison-go:location}
 
 [pygobject3]
 pre-configure +=
@@ -126,18 +116,6 @@ pre-configure +=
 post-install =
   sed -i 's#!${python:location}/bin/python${python:version}#!/opt/slapos/parts/python${python:version}/bin/python${python:version}#' ${python:location}/bin/python${python:version}-config
 
-[ncurses]
-configure-options =
-  --prefix=${buildout:parts-directory}/${:_buildout_section_name_}
-  --with-shared
-  --without-ada
-  --without-manpages
-  --without-tests
-  --without-normal
-  --without-debug
-  --without-gpm
-  --enable-rpath
-
 [flex]
 environment +=
  BISON_PKGDATADIR=${bison:location}/share/bison/
@@ -154,7 +132,6 @@ post-install =
   sed -i "s#'${buildout:destdir}/parts/site_perl#'/opt/slapos/parts/site_perl#" ${perl:location}/lib/5.28.1/*-linux-thread-multi/Config.pm
 
 [perl]
-location = ${buildout:destdir}/parts/perl
 configure-command =
   sh Configure -des \
     -Dprefix=${buildout:rootdir}/parts/${:_buildout_section_name_} \