26 lines
817 B
Python
26 lines
817 B
Python
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#!/usr/bin/env python3
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import logging
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from typing import Optional
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from flupdt.common import bash_wrapper
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import re
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drv_re = re.compile(r'.*(/nix/store/.*\.drv).*')
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def evaluate_output(path:str, output: str) -> Optional[str]:
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logging.info(f"evaluating {output}")
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out = bash_wrapper(f"nix eval {path}#{output}")
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logging.debug(out[0])
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logging.debug(out[1])
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logging.debug(out[2])
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if out[2] != 0:
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logging.warning(f"output {output} did not evaluate correctly")
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return None
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else:
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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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logging.debug(f"derivation evaluated to {drv}")
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