ahuston-0
607f3f9f76
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Signed-off-by: ahuston-0 <aliceghuston@gmail.com>
39 lines
1.1 KiB
Python
39 lines
1.1 KiB
Python
"""Provides components to evaluate nix components and process the result."""
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from __future__ import annotations
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import logging
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import re
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from flupdt.common import bash_wrapper
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drv_re = re.compile(r".*(/nix/store/.*\.drv).*")
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logger = logging.getLogger(__name__)
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def evaluate_output(path: str, output: str) -> str | None:
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"""Evaluates a given output in a flake.
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:param path: path to flake
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:param output: flake output to be evaluated
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:returns the .drv path on success or None on failure
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:raises RuntimeError: evaluation succeeds but no derivation is found
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"""
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logger.info(f"evaluating {output}")
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out = bash_wrapper(f"nix eval {path}#{output}")
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logger.debug(out[0])
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logger.debug(out[1])
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logger.debug(out[2])
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if out[2] != 0:
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logger.warning(f"output {output} did not evaluate correctly")
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return None
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drv_match = drv_re.match(out[0])
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if drv_match is None:
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out_msg = "derivation succeeded but output derivation does not contain a derivation"
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raise RuntimeError(out_msg)
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drv = drv_match.group(1)
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logger.debug(f"derivation evaluated to {drv}")
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return drv
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