intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 69 insertions, 0 deletions

diff --git a/library/python/runtime_py3/sitecustomize.pyx b/library/python/runtime_py3/sitecustomize.pyx
new file mode 100644
index 0000000000..966bbe8ba6
--- /dev/null
+++ b/library/python/runtime_py3/sitecustomize.pyx
@@ -0,0 +1,69 @@
+import re
+import sys
+
+import __res
+
+from importlib.abc import ResourceReader
+from importlib.metadata import Distribution, DistributionFinder, PackageNotFoundError, Prepared
+
+ResourceReader.register(__res._ResfsResourceReader)
+
+METADATA_NAME = re.compile('^Name: (.*)$', re.MULTILINE)
+
+
+class ArcadiaDistribution(Distribution):
+
+    def __init__(self, prefix):
+        self.prefix = prefix
+
+    def read_text(self, filename):
+        data = __res.resfs_read(f'{self.prefix}{filename}')
+        if data:
+            return data.decode('utf-8')
+    read_text.__doc__ = Distribution.read_text.__doc__
+
+    def locate_file(self, path):
+        return f'{self.prefix}{path}'
+
+
+class ArcadiaMetadataFinder(DistributionFinder):
+
+    prefixes = {}
+
+    @classmethod
+    def find_distributions(cls, context=DistributionFinder.Context()):
+        found = cls._search_prefixes(context.name)
+        return map(ArcadiaDistribution, found)
+
+    @classmethod
+    def _init_prefixes(cls):
+        cls.prefixes.clear()
+
+        for resource in __res.resfs_files():
+            resource = resource.decode('utf-8')
+            if not resource.endswith('METADATA'):
+                continue
+            data = __res.resfs_read(resource).decode('utf-8')
+            metadata_name = METADATA_NAME.search(data)
+            if metadata_name:
+                metadata_name = Prepared(metadata_name.group(1))
+                cls.prefixes[metadata_name.normalized] = resource[:-len('METADATA')]
+
+    @classmethod
+    def _search_prefixes(cls, name):
+        if not cls.prefixes:
+            cls._init_prefixes()
+
+        if name:
+            try:
+                yield cls.prefixes[Prepared(name).normalized]
+            except KeyError:
+                raise PackageNotFoundError(name)
+        else:
+            for prefix in sorted(cls.prefixes.values()):
+                yield prefix
+
+
+# monkeypatch standart library
+import importlib.metadata
+importlib.metadata.MetadataPathFinder = ArcadiaMetadataFinder