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39 lines
1.2 KiB
Python
39 lines
1.2 KiB
Python
""" Os detection facilities. """
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def os_select(
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ctx = None,
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*,
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linux = None,
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windows = None,
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macos = None,
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default = None):
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"""
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This can work both in a macro and a rule context to choose something based on the current OS.
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If used in a rule implementation, you need to pass `ctx` and add `OS_DETECTION_ATTRS` to the
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rule attributes.
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"""
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choices = {
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"linux": linux or default,
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"windows": windows or default,
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"macos": macos or default,
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}
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if not ctx:
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return select({
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"@platforms//os:%s" % os: v
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for os, v in choices.items()
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if v != None
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})
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for os, v in choices.items():
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if ctx.target_platform_has_constraint(getattr(ctx.attr, "_%s_constraint" % os)[platform_common.ConstraintValueInfo]):
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if v == None:
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fail("%s not supported by %s" % (os, ctx.label))
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return v
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fail("Unknown OS detected")
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OS_DETECTION_ATTRS = {
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"_windows_constraint": attr.label(default = "@platforms//os:windows"),
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"_macos_constraint": attr.label(default = "@platforms//os:macos"),
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"_linux_constraint": attr.label(default = "@platforms//os:linux"),
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}
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