Index: node_modules/prebuild-install/util.js
===================================================================
--- node_modules/prebuild-install/util.js	(revision 81bc7da776d8cda42939ef4ab350c88d13b4941f)
+++ node_modules/prebuild-install/util.js	(revision 81bc7da776d8cda42939ef4ab350c88d13b4941f)
@@ -0,0 +1,143 @@
+const path = require('path')
+const github = require('github-from-package')
+const home = require('os').homedir
+const crypto = require('crypto')
+const expandTemplate = require('expand-template')()
+
+function getDownloadUrl (opts) {
+  const pkgName = opts.pkg.name.replace(/^@[a-zA-Z0-9_\-.~]+\//, '')
+  return expandTemplate(urlTemplate(opts), {
+    name: pkgName,
+    package_name: pkgName,
+    version: opts.pkg.version,
+    major: opts.pkg.version.split('.')[0],
+    minor: opts.pkg.version.split('.')[1],
+    patch: opts.pkg.version.split('.')[2],
+    prerelease: opts.pkg.version.split('-')[1],
+    build: opts.pkg.version.split('+')[1],
+    abi: opts.abi || process.versions.modules,
+    node_abi: process.versions.modules,
+    runtime: opts.runtime || 'node',
+    platform: opts.platform,
+    arch: opts.arch,
+    libc: opts.libc || '',
+    configuration: (opts.debug ? 'Debug' : 'Release'),
+    module_name: opts.pkg.binary && opts.pkg.binary.module_name,
+    tag_prefix: opts['tag-prefix']
+  })
+}
+
+function getApiUrl (opts) {
+  return github(opts.pkg).replace('github.com', 'api.github.com/repos') + '/releases'
+}
+
+function getAssetUrl (opts, assetId) {
+  return getApiUrl(opts) + '/assets/' + assetId
+}
+
+function urlTemplate (opts) {
+  if (typeof opts.download === 'string') {
+    return opts.download
+  }
+
+  const packageName = '{name}-v{version}-{runtime}-v{abi}-{platform}{libc}-{arch}.tar.gz'
+  const hostMirrorUrl = getHostMirrorUrl(opts)
+
+  if (hostMirrorUrl) {
+    return hostMirrorUrl + '/{tag_prefix}{version}/' + packageName
+  }
+
+  if (opts.pkg.binary && opts.pkg.binary.host) {
+    return [
+      opts.pkg.binary.host,
+      opts.pkg.binary.remote_path,
+      opts.pkg.binary.package_name || packageName
+    ].map(function (path) {
+      return trimSlashes(path)
+    }).filter(Boolean).join('/')
+  }
+
+  return github(opts.pkg) + '/releases/download/{tag_prefix}{version}/' + packageName
+}
+
+function getEnvPrefix (pkgName) {
+  return 'npm_config_' + (pkgName || '').replace(/[^a-zA-Z0-9]/g, '_').replace(/^_/, '')
+}
+
+function getHostMirrorUrl (opts) {
+  const propName = getEnvPrefix(opts.pkg.name) + '_binary_host'
+  return process.env[propName] || process.env[propName + '_mirror']
+}
+
+function trimSlashes (str) {
+  if (str) return str.replace(/^\.\/|^\/|\/$/g, '')
+}
+
+function cachedPrebuild (url) {
+  const digest = crypto.createHash('sha512').update(url).digest('hex').slice(0, 6)
+  return path.join(prebuildCache(), digest + '-' + path.basename(url).replace(/[^a-zA-Z0-9.]+/g, '-'))
+}
+
+function npmCache () {
+  const env = process.env
+  return env.npm_config_cache || (env.APPDATA ? path.join(env.APPDATA, 'npm-cache') : path.join(home(), '.npm'))
+}
+
+function prebuildCache () {
+  return path.join(npmCache(), '_prebuilds')
+}
+
+function tempFile (cached) {
+  return cached + '.' + process.pid + '-' + Math.random().toString(16).slice(2) + '.tmp'
+}
+
+function packageOrigin (env, pkg) {
+  // npm <= 6: metadata is stored on disk in node_modules
+  if (pkg._from) {
+    return pkg._from
+  }
+
+  // npm 7: metadata is exposed to environment by arborist
+  if (env.npm_package_from) {
+    // NOTE: seems undefined atm (npm 7.0.2)
+    return env.npm_package_from
+  }
+
+  if (env.npm_package_resolved) {
+    // NOTE: not sure about the difference with _from, but it's all we have
+    return env.npm_package_resolved
+  }
+}
+
+function localPrebuild (url, opts) {
+  const propName = getEnvPrefix(opts.pkg.name) + '_local_prebuilds'
+  const prefix = process.env[propName] || opts['local-prebuilds'] || 'prebuilds'
+  return path.join(prefix, path.basename(url))
+}
+
+const noopLogger = {
+  http: function () {},
+  silly: function () {},
+  debug: function () {},
+  info: function () {},
+  warn: function () {},
+  error: function () {},
+  critical: function () {},
+  alert: function () {},
+  emergency: function () {},
+  notice: function () {},
+  verbose: function () {},
+  fatal: function () {}
+}
+
+exports.getDownloadUrl = getDownloadUrl
+exports.getApiUrl = getApiUrl
+exports.getAssetUrl = getAssetUrl
+exports.urlTemplate = urlTemplate
+exports.cachedPrebuild = cachedPrebuild
+exports.localPrebuild = localPrebuild
+exports.prebuildCache = prebuildCache
+exports.npmCache = npmCache
+exports.tempFile = tempFile
+exports.packageOrigin = packageOrigin
+exports.noopLogger = noopLogger