stream_layered_image: Clarify assertion failure
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@ -146,7 +146,9 @@ def add_layer_dir(tar, paths, mtime, add_nix=True, filter=None):
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the layer added.
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"""
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assert all(i.startswith("/nix/store/") for i in paths)
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invalid_paths = [i for i in paths if not i.startswith("/nix/store/")]
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assert len(invalid_paths) == 0, \
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"Expecting absolute store paths, but got: {invalid_paths}"
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# First, calculate the tarball checksum and the size.
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extract_checksum = ExtractChecksum()
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