Reorganise morphologies for build-essential

This patch rewrites the Baserock morphologies so that they can be
built using a minimal "build-essential" staging filler, as described
in my previous patch mail.

The Baserock system is split up into three strata:

  - build-essential: the minimum set of tools that can rebuild
    itself (from tarballs)
  - core: the remaining set of components necessary to produce
    a Baserock system which can rebuild itself from source
  - tools: auxiliary development tools and libraries

The 'build-essential' stratum does not specify any build
dependencies, because it expects to be built with a staging filler
containing itself. In effect, the stratum has a circular dependency
on itself, which we solve by using a staging filler. The 'core'
stratum depends on only on 'build-essential'. This ensures that all
build dependencies between chunks in 'core' are explicit. These
strata can also be built with the staging filler from the water-bomb
release.

The distinction between a base and a devel system is no longer
defined by the 'foundation' and 'devel' strata (in practice these
had various hidden build dependencies between each other). The size
of a base system is larger than before, due to more development tools
being in 'core'.

1 files changed, 7 insertions, 0 deletions

diff --git a/bsp-x86_64-generic.morph b/bsp-x86_64-generic.morph
index 954b7b54..ae477fe2 100644
--- a/bsp-x86_64-generic.morph
+++ b/bsp-x86_64-generic.morph
@@ -2,6 +2,13 @@
     "name": "bsp-x86_64-generic",
     "description": "The set of platform specific components required for booting a 64-bit x86 based system.",
     "kind": "stratum",
+    "build-depends": [
+        {
+            "repo": "baserock:baserock/morphs",
+            "ref": "baserock/samthursfield/build-essential",
+            "morph": "core"
+        }
+    ],
     "chunks": [
         {
             "name": "linux",