def assemble()

in src/buildstream/plugins/elements/compose.py [0:0]

• 53 lines of code
• 17 McCabe index (conditional complexity)

    def assemble(self, sandbox):
        manifest = set()

        require_split = self.include or self.exclude or not self.include_orphans
        if require_split:
            with self.timed_activity("Computing split", silent_nested=True):
                for dep in self.dependencies():
                    files = dep.compute_manifest(
                        include=self.include, exclude=self.exclude, orphans=self.include_orphans
                    )
                    manifest.update(files)

        # Make a snapshot of all the files.
        vbasedir = sandbox.get_virtual_directory()
        removed_files = set()
        added_files = set()

        # Run any integration commands provided by the dependencies
        # once they are all staged and ready
        if self.integration:
            with self.timed_activity("Integrating sandbox"):
                if require_split:

                    # Make a snapshot of all the files before integration-commands are run.
                    snapshot = set(vbasedir.list_relative_paths())

                with sandbox.batch():
                    for dep in self.dependencies():
                        dep.integrate(sandbox)

                if require_split:
                    # Calculate added and removed files
                    post_integration_snapshot = vbasedir.list_relative_paths()
                    basedir_contents = set(post_integration_snapshot)
                    for path in manifest:
                        if path in snapshot and path not in basedir_contents:
                            removed_files.add(path)

                    for path in basedir_contents:
                        if path not in snapshot:
                            added_files.add(path)
                    self.info("Integration added {} and removed {} files".format(len(added_files), len(removed_files)))

        # The remainder of this is expensive, make an early exit if
        # we're not being selective about what is to be included.
        if not require_split:
            return "/"

        # Update the manifest with files which were added/removed by integration commands
        #
        manifest.update(added_files)
        manifest.difference_update(removed_files)

        # XXX We should be moving things outside of the build sandbox
        # instead of into a subdir. The element assemble() method should
        # support this in some way.
        #
        installdir = vbasedir.open_directory("buildstream/install", create=True)

        # We already saved the manifest for created files in the integration phase,
        # now collect the rest of the manifest.
        #

        lines = []
        if self.include:
            lines.append("Including files from domains: " + ", ".join(self.include))
        else:
            lines.append("Including files from all domains")

        if self.exclude:
            lines.append("Excluding files from domains: " + ", ".join(self.exclude))

        if self.include_orphans:
            lines.append("Including orphaned files")
        else:
            lines.append("Excluding orphaned files")

        detail = "\n".join(lines)

        def import_filter(path):
            return path in manifest

        with self.timed_activity("Creating composition", detail=detail, silent_nested=True):
            self.info("Composing {} files".format(len(manifest)))
            installdir.import_files(vbasedir, filter_callback=import_filter, collect_result=False)

        # And we're done
        return os.path.join(os.sep, "buildstream", "install")