image building: fix comment for relPath
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@ -52,7 +52,7 @@ in
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(builtins.substring 0 (builtins.stringLength sub) super) == sub
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);
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# return the (string) path to get from `stem` to `path`
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# XXX: not sure how this behaves if the path doesn't contain the stem.
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# or errors if not a sub-path
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relPath = stem: path: (
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builtins.head (builtins.match "^${stem}(.+)" path)
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);
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