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✏️ Editing: detect-libc.js

// Copyright 2017 Lovell Fuller and others.
// SPDX-License-Identifier: Apache-2.0

'use strict';

const childProcess = require('child_process');
const { isLinux, getReport } = require('./process');
const { LDD_PATH, readFile, readFileSync } = require('./filesystem');

let cachedFamilyFilesystem;
let cachedVersionFilesystem;

const command = 'getconf GNU_LIBC_VERSION 2>&1 || true; ldd --version 2>&1 || true';
let commandOut = '';

/**
 * A String constant containing the value `glibc`.
 * @type {string}
 * @public
 */
const GLIBC = 'glibc';

/**
 * A Regexp constant to get the GLIBC Version.
 * @type {string}
 */
const RE_GLIBC_VERSION = /LIBC[a-z0-9 \-).]*?(\d+\.\d+)/i;

/**
 * A String constant containing the value `musl`.
 * @type {string}
 * @public
 */
const MUSL = 'musl';

const isFileMusl = (f) => f.includes('libc.musl-') || f.includes('ld-musl-');

const getFamilyFromLddContent = (content) => {
  if (content.includes('musl')) {
    return MUSL;
  }
  if (content.includes('GNU C Library')) {
    return GLIBC;
  }
  return null;
};

/**
 * Resolves with the libc family when it can be determined, `null` otherwise.
 * @returns {Promise<?string>}
 */
const family = async () => {
  let family = null;
  if (isLinux()) {
    family = await familyFromFilesystem();
    if (!family) {
      family = familyFromReport();
    }
    if (!family) {
      const out = await safeCommand();
      family = familyFromCommand(out);
    }
  }
  return family;
};

/**
 * Returns the libc family when it can be determined, `null` otherwise.
 * @returns {?string}
 */
const familySync = () => {
  let family = null;
  if (isLinux()) {
    family = familyFromFilesystemSync();
    if (!family) {
      family = familyFromReport();
    }
    if (!family) {
      const out = safeCommandSync();
      family = familyFromCommand(out);
    }
  }
  return family;
};

/**
 * Resolves `true` only when the platform is Linux and the libc family is not `glibc`.
 * @returns {Promise<boolean>}
 */
const isNonGlibcLinux = async () => isLinux() && await family() !== GLIBC;

/**
 * Returns `true` only when the platform is Linux and the libc family is not `glibc`.
 * @returns {boolean}
 */
const isNonGlibcLinuxSync = () => isLinux() && familySync() !== GLIBC;

const versionFromReport = () => {
  const report = getReport();
  if (report.header && report.header.glibcVersionRuntime) {
    return report.header.glibcVersionRuntime;
  }
  return null;
};

const versionSuffix = (s) => s.trim().split(/\s+/)[1];

/**
 * Resolves with the libc version when it can be determined, `null` otherwise.
 * @returns {Promise<?string>}
 */
const version = async () => {
  let version = null;
  if (isLinux()) {
    version = await versionFromFilesystem();
    if (!version) {
      version = versionFromReport();
    }
    if (!version) {
      const out = await safeCommand();
      version = versionFromCommand(out);
    }
  }
  return version;
};

/**
 * Returns the libc version when it can be determined, `null` otherwise.
 * @returns {?string}
 */
const versionSync = () => {
  let version = null;
  if (isLinux()) {
    version = versionFromFilesystemSync();
    if (!version) {
      version = versionFromReport();
    }
    if (!version) {
      const out = safeCommandSync();
      version = versionFromCommand(out);
    }
  }
  return version;
};

module.exports = {
  GLIBC,
  MUSL,
  family,
  familySync,
  isNonGlibcLinux,
  isNonGlibcLinuxSync,
  version,
  versionSync
};

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