1 files changed, 79 insertions, 0 deletions
diff --git a/morphlib/plugins/show_dependencies_plugin.py b/morphlib/plugins/show_dependencies_plugin.py
new file mode 100644
index 00000000..e70f6bfb
--- /dev/null
+++ b/morphlib/plugins/show_dependencies_plugin.py
@@ -0,0 +1,79 @@
+# Copyright (C) 2012-2014  Codethink Limited
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+
+import cliapp
+import os
+
+import morphlib
+
+
+class ShowDependenciesPlugin(cliapp.Plugin):
+
+    def enable(self):
+        self.app.add_subcommand('show-dependencies',
+                                self.show_dependencies,
+                                arg_synopsis='(REPO REF MORPHOLOGY)...')
+
+    def disable(self):
+        pass
+
+    def show_dependencies(self, args):
+        '''Dumps the dependency tree of all input morphologies.
+
+        Command line arguments:
+
+        * `REPO` is a git repository URL.
+        * `REF` is a branch or other commit reference in that repository.
+        * `FILENAME` is a morphology filename at that ref.
+
+        This command analyses a system morphology and produces a listing
+        of build dependencies of the constituent components.
+
+        '''
+
+        if not os.path.exists(self.app.settings['cachedir']):
+            os.mkdir(self.app.settings['cachedir'])
+        cachedir = os.path.join(self.app.settings['cachedir'], 'gits')
+        tarball_base_url = self.app.settings['tarball-server']
+        repo_resolver = morphlib.repoaliasresolver.RepoAliasResolver(
+            self.app.settings['repo-alias'])
+        lrc = morphlib.localrepocache.LocalRepoCache(
+            self.app, cachedir, repo_resolver, tarball_base_url)
+
+        remote_url = morphlib.util.get_git_resolve_cache_server(
+            self.app.settings)
+        if remote_url:
+            rrc = morphlib.remoterepocache.RemoteRepoCache(
+                remote_url, repo_resolver)
+        else:
+            rrc = None
+            
+        build_command = morphlib.buildcommand.BuildCommand(self.app)
+
+        # traverse the morphs to list all the sources
+        for repo, ref, filename in self.app.itertriplets(args):
+            morph = morphlib.util.sanitise_morphology_path(filename)
+            self.app.output.write('dependency graph for %s|%s|%s:\n' %
+                                  (repo, ref, morph))
+
+            srcpool = build_command.create_source_pool(repo, ref, filename)
+            root_artifact = build_command.resolve_artifacts(srcpool)
+
+            for artifact in reversed(root_artifact.walk()):
+                self.app.output.write('  %s\n' % artifact)
+                for dep in sorted(artifact.source.dependencies, key=str):
+                    self.app.output.write('    -> %s\n' % dep)
+