_frontend/cli.py: Reinstate support for guessing targetsjuerg/source-guess-target

Moving fetch and track to the source command group accidentally dropped
the support for guessing targets for these commands when invoked from a
workspace directory. This brings it back.

1 files changed, 10 insertions, 0 deletions

diff --git a/buildstream/_frontend/cli.py b/buildstream/_frontend/cli.py
index 29fc4cf54..bdcf3ca27 100644
--- a/buildstream/_frontend/cli.py
+++ b/buildstream/_frontend/cli.py
@@ -719,6 +719,11 @@ def source_fetch(app, elements, deps, track_, except_, track_cross_junctions):
         deps = PipelineSelection.ALL
 
     with app.initialized(session_name="Fetch"):
+        if not elements:
+            guessed_target = app.context.guess_element()
+            if guessed_target:
+                elements = (guessed_target,)
+
         app.stream.fetch(elements,
                          selection=deps,
                          except_targets=except_,
@@ -755,6 +760,11 @@ def source_track(app, elements, deps, except_, cross_junctions):
         all:   All dependencies of all specified elements
     """
     with app.initialized(session_name="Track"):
+        if not elements:
+            guessed_target = app.context.guess_element()
+            if guessed_target:
+                elements = (guessed_target,)
+
         # Substitute 'none' for 'redirect' so that element redirections
         # will be done
         if deps == 'none':