Add morph cross-bootstrap

Cross-bootstrap is a way to build baserock on an architecture that
does not currently have Baserock. It can be used by `morph
cross-bootstrap <ARCH> <REPO> <REF> <MORPH>`, and will build an artifact
that can be used as a root filesystem with a basic build environment
with a script named `native-bootstrap` which will build and install
every chunk in the system.

If done with a devel system, this will give you a suitable environment
for building a proper Baserock system.

This does not currently provide a kernel for the target architecture.

Apart from adding the cross-bootstrap plugin, it also makes the
following changes:

* Moves the lit of valid_archs into morphlib (instead of locally-scoped
  in MorphologyFactory)
* BuildCommand takes an extra argument, build_env
* split BuildCommand's get_artifact_object into create_source_pool and
  resolve_artifacts (plus changes things that use get_artifact_object to
  use the new way)
* setup_mounts finds out whether to do so by whether build_mode is
 'staging', instead of by whether the setting 'staging-chroot' is true.
* Makes ChunkBuilder's get_sources use the
  morphlib.builder2.extract_sources() method, and moved
  set_mtime_recursively into morphlib.builder2, since it's not currently
  used anywhere else.
* moved ChunkBuilder's get_commands into the Morphology class (plus
  changes to anything that used get_commands)

1 files changed, 1 insertions, 118 deletions

diff --git a/tests.build/bootstrap-mode.script b/tests.build/bootstrap-mode.script
index f4ff0a36..923fb21f 100755
--- a/tests.build/bootstrap-mode.script
+++ b/tests.build/bootstrap-mode.script
@@ -23,124 +23,7 @@
 set -eu
 
 # Create a fake 'compiler' chunk to go into build-essential stratum
-
-mkdir -p "$DATADIR/cc-repo"
-cd "$DATADIR/cc-repo"
-
-cat <<EOF > "morph-test-cc"
-#!/bin/sh
-echo "I'm a compiler!"
-EOF
-chmod +x morph-test-cc
-
-cat <<EOF > "stage1-cc.morph"
-{
-    "name": "stage1-cc",
-    "kind": "chunk",
-    "install-commands": [
-        "install -d \"\$DESTDIR\$PREFIX/bin\"",
-        "install -m 755 morph-test-cc \"\$DESTDIR\$PREFIX/bin/morph-test-cc\""
-    ]
-}
-EOF
-
-cat <<EOF > "cc.morph"
-{
-    "name": "cc",
-    "kind": "chunk",
-    "configure-commands": [
-        "[ -e ../tools/bin/morph-test-cc ]"
-    ],
-    "install-commands": [
-        "install -d \"\$DESTDIR\$PREFIX/bin\"",
-        "install -m 755 morph-test-cc \"\$DESTDIR\$PREFIX/bin/morph-test-cc\""
-    ]
-}
-EOF
-
-git init -q
-git add morph-test-cc cc.morph stage1-cc.morph
-git commit -q -m "Create compiler chunk"
-
-# Require 'cc' in hello-chunk. We should have the second version available
-# but *not* the first one.
-cd "$DATADIR/chunk-repo"
-git checkout -q farrokh
-cat <<EOF > "hello.morph"
-{
-    "name": "hello",
-    "kind": "chunk",
-    "configure-commands": [
-        "[ ! -e ../tools/bin/morph-test-cc ]",
-        "[ -e ../usr/bin/morph-test-cc ]"
-    ],
-    "build-commands": [
-        "../usr/bin/morph-test-cc > hello"
-    ],
-    "install-commands": [
-        "install -d \"\$DESTDIR\$PREFIX/bin\"",
-        "install hello \"\$DESTDIR\$PREFIX/bin/hello\""
-    ]
-}
-EOF
-git add hello.morph
-git commit -q -m "Make 'hello' require our mock compiler"
-
-# Add 'build-essential' stratum and make hello-stratum depend upon it. Only
-# the *second* 'cc' chunk should make it into the build-essential stratum
-# artifact, and neither should make it into the system.
-cd "$DATADIR/morphs-repo"
-cat <<EOF > "build-essential.morph"
-{
-    "name": "build-essential",
-    "kind": "stratum",
-    "chunks": [
-        {
-            "name": "stage1-cc",
-            "repo": "test:cc-repo",
-            "ref": "master",
-            "build-depends": [],
-            "build-mode": "bootstrap",
-            "prefix": "/tools"
-        },
-        {
-            "name": "cc",
-            "repo": "test:cc-repo",
-            "ref": "master",
-            "build-depends": [
-                "stage1-cc"
-            ],
-            "build-mode": "test"
-        }
-    ]
-}
-EOF
-
-cat <<EOF > "hello-stratum.morph"
-{
-    "name": "hello-stratum",
-    "kind": "stratum",
-    "build-depends": [
-        {
-            "morph": "build-essential",
-            "repo": "test:morphs-repo",
-            "ref": "master"
-        }
-    ],
-    "chunks": [
-        {
-            "name": "hello",
-            "repo": "test:chunk-repo",
-            "ref": "farrokh",
-            "build-depends": [],
-            "build-mode": "test"
-        }
-    ]
-}
-EOF
-
-git add build-essential.morph hello-stratum.morph hello-system.morph
-git commit -q -m "Add fake build-essential stratum"
+"$SRCDIR/tests.build/setup-build-essential"
 
 "$SRCDIR/scripts/test-morph" build-morphology \
     test:morphs-repo master hello-system