Make more commands work outside a system-branch/workspace

This makes `morph get-chunk-details`, `morph get-repo` and `morph
show-build-log` work in any Git checkout of definitions.git. These
are all of the commands outside of the deprecated
branch_and_merge_plugin that take notice of system branches.

The DefinitionsRepo.relative_path_to_chunk() function is changed a
bit. It actually only existed for the `get-repo` command to use, but
it turns out that it did the wrong thing by returning a long path for
the repo (e.g. baserock/baserock/fhs-dirs) instead of a short one
(fhs-dirs). The latter is less typing, and is the behaviour expected
by the `get-repo` yarn tests, so it now does that.

Change-Id: I430b540b3b0f309cf7018e0b8236f0e8a9042d89

1 files changed, 3 insertions, 2 deletions

diff --git a/morphlib/plugins/get_chunk_details_plugin.py b/morphlib/plugins/get_chunk_details_plugin.py
index 842b4afe..e58ed6c5 100644
--- a/morphlib/plugins/get_chunk_details_plugin.py
+++ b/morphlib/plugins/get_chunk_details_plugin.py
@@ -47,14 +47,15 @@ class GetChunkDetailsPlugin(cliapp.Plugin):
                 'Wrong number of arguments to get-chunk-details command '
                 '(see help)')
 
-        sb = morphlib.sysbranchdir.open_from_within('.')
+        definitions_repo = morphlib.definitions_repo.open(
+            '.', search_for_root=True, search_workspace=True, app=self.app)
         loader = morphlib.morphloader.MorphologyLoader()
 
         aliases = self.app.settings['repo-alias']
         self.resolver = morphlib.repoaliasresolver.RepoAliasResolver(aliases)
 
         found = 0
-        for morph in sb.load_all_morphologies(loader):
+        for morph in definitions_repo.load_all_morphologies(loader):
             if morph['kind'] == 'stratum':
                 if (stratum_name == None or
                         morph['name'] == stratum_name):