34 lines
1.0 KiB
Python
34 lines
1.0 KiB
Python
"""Utility to diff nix derivations."""
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import logging
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import shutil
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from flupdt.common import bash_wrapper
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def compare_derivations(
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path_to_flake: str, path_to_pre_drv: str, path_to_post_drv: str, *, soft_failure: bool = True
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) -> str:
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"""Gets all derivations present in a flake.
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:param path_to_flake: path to flake to be checked
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:returns a list of all valid derivations in the flake
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:raises RuntimeError: fails if nix is not present in the PATH
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"""
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nvd_path = shutil.which("nvd")
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if nvd_path is None:
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status_msg = "nvd is not available in the PATH, please verify that it is installed"
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raise RuntimeError(status_msg)
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stdout, stderr, returncode = bash_wrapper(
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f"{nvd_path} diff {path_to_pre_drv} {path_to_post_drv}", path=path_to_flake
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)
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if returncode != 0:
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log_func = logging.error
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if soft_failure:
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log_func = logging.warning
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logging.warning(f"diff failed for {path_to_pre_drv} and {path_to_post_drv}")
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log_func(stderr)
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return stdout
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