a783e4645d
Now environment variable overrides no longer infect the build scripts. _toolchain.overrides is dropped as probably misguided in the first place. Fixes #251.
38 lines
1 KiB
Python
38 lines
1 KiB
Python
import os
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import shutil
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__all__ = ["ToolNotFound", "tool_env_var", "has_tool", "require_tool"]
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class ToolNotFound(Exception):
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pass
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def tool_env_var(name):
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return name.upper().replace("-", "_")
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def _get_tool(name):
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return os.environ.get(tool_env_var(name), name)
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def has_tool(name):
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return shutil.which(_get_tool(name)) is not None
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def require_tool(name):
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env_var = tool_env_var(name)
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path = _get_tool(name)
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if shutil.which(path) is None:
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if env_var in os.environ:
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raise ToolNotFound("Could not find required tool {} in {} as "
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"specified via the {} environment variable".
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format(name, path, env_var))
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else:
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raise ToolNotFound("Could not find required tool {} in PATH. Place "
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"it directly in PATH or specify path explicitly "
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"via the {} environment variable".
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format(name, env_var))
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return path
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