def all_roots(self):
"""Return all known source roots.
Returns a generator over (source root, list of langs, category) triples.
Note: Requires a directory walk to match actual directories against patterns.
However we don't descend into source roots, once found, so this should be fast in practice.
Note: Does not follow symlinks.
"""
project_tree = FileSystemProjectTree(get_buildroot(),
self._options.pants_ignore)
fixed_roots = set()
for root, langs, category in self._trie.fixed():
if project_tree.exists(root):
yield self._source_root_factory.create(root, langs, category)
fixed_roots.add(root)
for relpath, dirnames, _ in project_tree.walk("", topdown=True):
match = self._trie.find(relpath)
if match:
if not any(
fixed_root.startswith(relpath)
for fixed_root in fixed_roots):
yield match # Found a source root not a prefix of any fixed roots.
del dirnames[:] # Don't continue to walk into it.
