_context.py: Add 'dependencies' option to 'build' user config

This option sets the default value for the `--deps` option of
`bst build`.

3 files changed, 22 insertions, 2 deletions

diff --git a/src/buildstream/_context.py b/src/buildstream/_context.py
index ecdf6f97b..aab09b6d4 100644
--- a/src/buildstream/_context.py
+++ b/src/buildstream/_context.py
@@ -129,6 +129,9 @@ class Context():
         # Maximum jobs per build
         self.build_max_jobs = None
 
+        # Control which dependencies to build
+        self.build_dependencies = None
+
         # Size of the artifact cache in bytes
         self.config_cache_quota = None
 
@@ -347,9 +350,15 @@ class Context():
 
         # Load build config
         build = defaults.get_mapping('build')
-        build.validate_keys(['max-jobs'])
+        build.validate_keys(['max-jobs', 'dependencies'])
         self.build_max_jobs = build.get_int('max-jobs')
 
+        self.build_dependencies = build.get_str('dependencies')
+        if self.build_dependencies not in ['plan', 'all']:
+            provenance = build.get_scalar('dependencies').get_provenance()
+            raise LoadError("{}: Invalid value for 'dependencies'. Choose 'plan' or 'all'."
+                            .format(provenance), LoadErrorReason.INVALID_DATA)
+
         # Load per-projects overrides
         self._project_overrides = defaults.get_mapping('projects', default={})
 
diff --git a/src/buildstream/_frontend/cli.py b/src/buildstream/_frontend/cli.py
index 1fdbbdc58..3344c5c79 100644
--- a/src/buildstream/_frontend/cli.py
+++ b/src/buildstream/_frontend/cli.py
@@ -374,7 +374,7 @@ def init(app, project_name, format_version, element_path, force, target_director
 #                          Build Command                         #
 ##################################################################
 @cli.command(short_help="Build elements in a pipeline")
-@click.option('--deps', '-d', default='plan', show_default=True,
+@click.option('--deps', '-d', default=None,
               type=click.Choice(['plan', 'all']),
               help='The dependencies to build')
 @click.option('--track', 'track_', multiple=True,
@@ -423,6 +423,9 @@ def build(app, elements, deps, track_, track_save, track_all, track_except, trac
     with app.initialized(session_name="Build"):
         ignore_junction_targets = False
 
+        if deps is None:
+            deps = app.context.build_dependencies
+
         if not elements:
             elements = app.project.get_default_targets()
             # Junction elements cannot be built, exclude them from default targets
diff --git a/src/buildstream/data/userconfig.yaml b/src/buildstream/data/userconfig.yaml
index a73c1ce44..dc31c10ce 100644
--- a/src/buildstream/data/userconfig.yaml
+++ b/src/buildstream/data/userconfig.yaml
@@ -90,6 +90,14 @@ build:
   #
   max-jobs: 0
 
+  #
+  # Control which dependencies to build:
+  #
+  #  plan - Only dependencies required for the build plan
+  #  all  - All dependencies
+  #
+  dependencies: plan
+
 
 #
 #    Logging