1 files changed, 81 insertions, 0 deletions
diff --git a/node_modules/node-gyp/lib/util.js b/node_modules/node-gyp/lib/util.js
new file mode 100644
index 0000000..3f6aeeb
--- /dev/null
+++ b/node_modules/node-gyp/lib/util.js
@@ -0,0 +1,81 @@
+'use strict'
+
+const cp = require('child_process')
+const path = require('path')
+const { openSync, closeSync } = require('graceful-fs')
+const log = require('./log')
+
+const execFile = async (...args) => new Promise((resolve) => {
+  const child = cp.execFile(...args, (...a) => resolve(a))
+  child.stdin.end()
+})
+
+async function regGetValue (key, value, addOpts) {
+  const outReValue = value.replace(/\W/g, '.')
+  const outRe = new RegExp(`^\\s+${outReValue}\\s+REG_\\w+\\s+(\\S.*)$`, 'im')
+  const reg = path.join(process.env.SystemRoot, 'System32', 'reg.exe')
+  const regArgs = ['query', key, '/v', value].concat(addOpts)
+
+  log.silly('reg', 'running', reg, regArgs)
+  const [err, stdout, stderr] = await execFile(reg, regArgs, { encoding: 'utf8' })
+
+  log.silly('reg', 'reg.exe stdout = %j', stdout)
+  if (err || stderr.trim() !== '') {
+    log.silly('reg', 'reg.exe err = %j', err && (err.stack || err))
+    log.silly('reg', 'reg.exe stderr = %j', stderr)
+    if (err) {
+      throw err
+    }
+    throw new Error(stderr)
+  }
+
+  const result = outRe.exec(stdout)
+  if (!result) {
+    log.silly('reg', 'error parsing stdout')
+    throw new Error('Could not parse output of reg.exe')
+  }
+
+  log.silly('reg', 'found: %j', result[1])
+  return result[1]
+}
+
+async function regSearchKeys (keys, value, addOpts) {
+  for (const key of keys) {
+    try {
+      return await regGetValue(key, value, addOpts)
+    } catch {
+      continue
+    }
+  }
+}
+
+/**
+ * Returns the first file or directory from an array of candidates that is
+ * readable by the current user, or undefined if none of the candidates are
+ * readable.
+ */
+function findAccessibleSync (logprefix, dir, candidates) {
+  for (let next = 0; next < candidates.length; next++) {
+    const candidate = path.resolve(dir, candidates[next])
+    let fd
+    try {
+      fd = openSync(candidate, 'r')
+    } catch (e) {
+      // this candidate was not found or not readable, do nothing
+      log.silly(logprefix, 'Could not open %s: %s', candidate, e.message)
+      continue
+    }
+    closeSync(fd)
+    log.silly(logprefix, 'Found readable %s', candidate)
+    return candidate
+  }
+
+  return undefined
+}
+
+module.exports = {
+  execFile,
+  regGetValue,
+  regSearchKeys,
+  findAccessibleSync
+}