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/*
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 *  This file is part of CoCalc: Copyright © 2020 Sagemath, Inc.
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 *  License: MS-RSL – see LICENSE.md for details
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 */
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// path is assumed relative to the HOME directory
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// return value is also relative to HOME directory -- if it is
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// a symlink to something outside of the HOME directory, we just
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// return the input!  This is used for sync so this is the best
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// we can do for now (see https://github.com/sagemathinc/cocalc/issues/4732)
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import { realpath as fs_realpath } from "node:fs/promises";
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// SMC_LOCAL_HUB_HOME is used for developing cocalc inside cocalc...
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const HOME: string =
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  process.env.SMC_LOCAL_HUB_HOME ?? process.env.HOME ?? "/home/user";
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export async function realpath(path: string): Promise<string> {
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  const fullpath = HOME + "/" + path;
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  const rpath = await fs_realpath(fullpath);
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  if (rpath == fullpath || !rpath.startsWith(HOME + "/")) {
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    return path;
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  }
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  return rpath.slice((HOME + "/").length);
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}
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