fix ruff checks (mostly documentation and dead code)

flupdt/flake_build.py

@@ -0,0 +1,31 @@
+"""Provides components to build nix components and process the result."""
+
+from __future__ import annotations
+
+import logging
+import re
+
+from flupdt.common import bash_wrapper
+
+drv_re = re.compile(r".*(/nix/store/.*\.drv).*")
+
+
+def build_output(path: str, output: str) -> str | None:
+    """Builds a given output in a flake.
+
+    :param path: path to flake
+    :param output: flake output to be built
+    :returns the .drv path on success or None on failure
+    """
+    logging.info(f"build {output}")
+    out = bash_wrapper(f"nix build {path}#{output} -o {output}.nixoutput")
+    logging.debug("output")
+    logging.debug(out[0])
+    logging.debug("error")
+    logging.debug(out[1])
+    logging.debug("statuscode")
+    logging.debug(out[2])
+    if out[2] != 0:
+        logging.warning(f"output {output} did not build correctly")
+        return None
+    return ""