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node_modules/write-file-atomic/index.js

@@ -0,0 +1,222 @@
+'use strict'
+module.exports = writeFile
+module.exports.sync = writeFileSync
+module.exports._getTmpname = getTmpname // for testing
+module.exports._cleanupOnExit = cleanupOnExit
+
+var fs = require('graceful-fs')
+var MurmurHash3 = require('imurmurhash')
+var onExit = require('signal-exit')
+var path = require('path')
+var activeFiles = {}
+
+// if we run inside of a worker_thread, `process.pid` is not unique
+/* istanbul ignore next */
+var threadId = (function getId () {
+  try {
+    var workerThreads = require('worker_threads')
+
+    /// if we are in main thread, this is set to `0`
+    return workerThreads.threadId
+  } catch (e) {
+    // worker_threads are not available, fallback to 0
+    return 0
+  }
+})()
+
+var invocations = 0
+function getTmpname (filename) {
+  return filename + '.' +
+    MurmurHash3(__filename)
+      .hash(String(process.pid))
+      .hash(String(threadId))
+      .hash(String(++invocations))
+      .result()
+}
+
+function cleanupOnExit (tmpfile) {
+  return function () {
+    try {
+      fs.unlinkSync(typeof tmpfile === 'function' ? tmpfile() : tmpfile)
+    } catch (_) {}
+  }
+}
+
+function writeFile (filename, data, options, callback) {
+  if (options) {
+    if (options instanceof Function) {
+      callback = options
+      options = {}
+    } else if (typeof options === 'string') {
+      options = { encoding: options }
+    }
+  } else {
+    options = {}
+  }
+
+  var Promise = options.Promise || global.Promise
+  var truename
+  var fd
+  var tmpfile
+  /* istanbul ignore next -- The closure only gets called when onExit triggers */
+  var removeOnExitHandler = onExit(cleanupOnExit(() => tmpfile))
+  var absoluteName = path.resolve(filename)
+
+  new Promise(function serializeSameFile (resolve) {
+    // make a queue if it doesn't already exist
+    if (!activeFiles[absoluteName]) activeFiles[absoluteName] = []
+
+    activeFiles[absoluteName].push(resolve) // add this job to the queue
+    if (activeFiles[absoluteName].length === 1) resolve() // kick off the first one
+  }).then(function getRealPath () {
+    return new Promise(function (resolve) {
+      fs.realpath(filename, function (_, realname) {
+        truename = realname || filename
+        tmpfile = getTmpname(truename)
+        resolve()
+      })
+    })
+  }).then(function stat () {
+    return new Promise(function stat (resolve) {
+      if (options.mode && options.chown) resolve()
+      else {
+        // Either mode or chown is not explicitly set
+        // Default behavior is to copy it from original file
+        fs.stat(truename, function (err, stats) {
+          if (err || !stats) resolve()
+          else {
+            options = Object.assign({}, options)
+
+            if (options.mode == null) {
+              options.mode = stats.mode
+            }
+            if (options.chown == null && process.getuid) {
+              options.chown = { uid: stats.uid, gid: stats.gid }
+            }
+            resolve()
+          }
+        })
+      }
+    })
+  }).then(function thenWriteFile () {
+    return new Promise(function (resolve, reject) {
+      fs.open(tmpfile, 'w', options.mode, function (err, _fd) {
+        fd = _fd
+        if (err) reject(err)
+        else resolve()
+      })
+    })
+  }).then(function write () {
+    return new Promise(function (resolve, reject) {
+      if (Buffer.isBuffer(data)) {
+        fs.write(fd, data, 0, data.length, 0, function (err) {
+          if (err) reject(err)
+          else resolve()
+        })
+      } else if (data != null) {
+        fs.write(fd, String(data), 0, String(options.encoding || 'utf8'), function (err) {
+          if (err) reject(err)
+          else resolve()
+        })
+      } else resolve()
+    })
+  }).then(function syncAndClose () {
+    if (options.fsync !== false) {
+      return new Promise(function (resolve, reject) {
+        fs.fsync(fd, function (err) {
+          if (err) reject(err)
+          else fs.close(fd, resolve)
+        })
+      })
+    }
+  }).then(function chown () {
+    if (options.chown) {
+      return new Promise(function (resolve, reject) {
+        fs.chown(tmpfile, options.chown.uid, options.chown.gid, function (err) {
+          if (err) reject(err)
+          else resolve()
+        })
+      })
+    }
+  }).then(function chmod () {
+    if (options.mode) {
+      return new Promise(function (resolve, reject) {
+        fs.chmod(tmpfile, options.mode, function (err) {
+          if (err) reject(err)
+          else resolve()
+        })
+      })
+    }
+  }).then(function rename () {
+    return new Promise(function (resolve, reject) {
+      fs.rename(tmpfile, truename, function (err) {
+        if (err) reject(err)
+        else resolve()
+      })
+    })
+  }).then(function success () {
+    removeOnExitHandler()
+    callback()
+  }, function fail (err) {
+    removeOnExitHandler()
+    fs.unlink(tmpfile, function () {
+      callback(err)
+    })
+  }).then(function checkQueue () {
+    activeFiles[absoluteName].shift() // remove the element added by serializeSameFile
+    if (activeFiles[absoluteName].length > 0) {
+      activeFiles[absoluteName][0]() // start next job if one is pending
+    } else delete activeFiles[absoluteName]
+  })
+}
+
+function writeFileSync (filename, data, options) {
+  if (typeof options === 'string') options = { encoding: options }
+  else if (!options) options = {}
+  try {
+    filename = fs.realpathSync(filename)
+  } catch (ex) {
+    // it's ok, it'll happen on a not yet existing file
+  }
+  var tmpfile = getTmpname(filename)
+
+  try {
+    if (!options.mode || !options.chown) {
+      // Either mode or chown is not explicitly set
+      // Default behavior is to copy it from original file
+      try {
+        var stats = fs.statSync(filename)
+        options = Object.assign({}, options)
+        if (!options.mode) {
+          options.mode = stats.mode
+        }
+        if (!options.chown && process.getuid) {
+          options.chown = { uid: stats.uid, gid: stats.gid }
+        }
+      } catch (ex) {
+        // ignore stat errors
+      }
+    }
+
+    var cleanup = cleanupOnExit(tmpfile)
+    var removeOnExitHandler = onExit(cleanup)
+    var fd = fs.openSync(tmpfile, 'w', options.mode)
+    if (Buffer.isBuffer(data)) {
+      fs.writeSync(fd, data, 0, data.length, 0)
+    } else if (data != null) {
+      fs.writeSync(fd, String(data), 0, String(options.encoding || 'utf8'))
+    }
+    if (options.fsync !== false) {
+      fs.fsyncSync(fd)
+    }
+    fs.closeSync(fd)
+    if (options.chown) fs.chownSync(tmpfile, options.chown.uid, options.chown.gid)
+    if (options.mode) fs.chmodSync(tmpfile, options.mode)
+    fs.renameSync(tmpfile, filename)
+    removeOnExitHandler()
+  } catch (err) {
+    removeOnExitHandler()
+    cleanup()
+    throw err
+  }
+}