Add a new 'morph build' for building from a system branch

This new command does a lot. First of all, its command line interface
has now changed to 'morph build SYSTEM' and it needs to be run from
a system branch.

When called, the new 'build' command will identify the repositories
and morphologies involved in building the system from the system branch,
create a build ref behind the scenes based on the system branch and add a
commit with all uncommitted changes to this build branch for every repo
involved. It will then push those build branches to the repository server
and kick off a build of BRANCH_ROOT BUILD_BRANCH SYSTEM.morph.

After building has finished, the remote build branches will be
deleted again.

1 files changed, 37 insertions, 0 deletions

diff --git a/tests.as-root/setup b/tests.as-root/setup
index 2ba0adf9..d4cb6d8a 100755
--- a/tests.as-root/setup
+++ b/tests.as-root/setup
@@ -31,6 +31,9 @@ set -eu
 # The $DATADIR should be empty at the beginnig of each test.
 find "$DATADIR" -mindepth 1 -delete
 
+# Create an empty directory to be used as a morph workspace
+mkdir "$DATADIR/workspace"
+
 # Create chunk repository.
 
 chunkrepo="$DATADIR/chunk-repo"
@@ -120,6 +123,40 @@ cat <<EOF > hello-system.morph
 EOF
 git add hello-system.morph
 
+cat <<EOF > linux-system.morph
+{
+    "name": "linux-system",
+    "kind": "system",
+    "system-kind": "syslinux-disk",
+    "arch": "$(uname -m)",
+    "disk-size": "1G",
+    "strata": [
+        {
+            "morph": "linux-stratum",
+            "repo": "test:morphs-repo",
+            "ref": "master"
+        }
+    ]
+}
+EOF
+git add linux-system.morph
+
+cat <<EOF > linux-stratum.morph
+{
+    "name": "linux-stratum",
+    "kind": "stratum",
+    "chunks": [
+        {
+            "name": "linux",
+            "repo": "test:kernel-repo",
+            "ref": "master",
+            "build-depends": []
+        }
+    ]
+}
+EOF
+git add linux-stratum.morph
+
 git commit --quiet -m "add morphs"
 
 # Make a dummy kernel chunk.