1 files changed, 66 insertions, 0 deletions
diff --git a/deps/npm/node_modules/gentle-fs/lib/link.js b/deps/npm/node_modules/gentle-fs/lib/link.js
new file mode 100644
index 0000000000..246d801479
--- /dev/null
+++ b/deps/npm/node_modules/gentle-fs/lib/link.js
@@ -0,0 +1,66 @@
+'use strict'
+
+const path = require('path')
+const fs = require('graceful-fs')
+const chain = require('slide').chain
+const mkdir = require('mkdirp')
+const rm = require('./rm.js')
+
+exports = module.exports = {
+  link: link,
+  linkIfExists: linkIfExists
+}
+
+function linkIfExists (from, to, opts, cb) {
+  fs.stat(from, function (er) {
+    if (er) return cb()
+    fs.readlink(to, function (er, fromOnDisk) {
+      // if the link already exists and matches what we would do,
+      // we don't need to do anything
+      if (!er) {
+        var toDir = path.dirname(to)
+        var absoluteFrom = path.resolve(toDir, from)
+        var absoluteFromOnDisk = path.resolve(toDir, fromOnDisk)
+        if (absoluteFrom === absoluteFromOnDisk) return cb()
+      }
+      link(from, to, opts, cb)
+    })
+  })
+}
+
+function resolveIfSymlink (maybeSymlinkPath, cb) {
+  fs.lstat(maybeSymlinkPath, function (err, stat) {
+    if (err) return cb.apply(this, arguments)
+    if (!stat.isSymbolicLink()) return cb(null, maybeSymlinkPath)
+    fs.readlink(maybeSymlinkPath, cb)
+  })
+}
+
+function ensureFromIsNotSource (from, to, cb) {
+  resolveIfSymlink(from, function (err, fromDestination) {
+    if (err) return cb.apply(this, arguments)
+    if (path.resolve(path.dirname(from), fromDestination) === path.resolve(to)) {
+      return cb(new Error('Link target resolves to the same directory as link source: ' + to))
+    }
+    cb.apply(this, arguments)
+  })
+}
+
+function link (from, to, opts, cb) {
+  to = path.resolve(to)
+  opts.base = path.dirname(to)
+  var absTarget = path.resolve(opts.base, from)
+  var relativeTarget = path.relative(opts.base, absTarget)
+  var target = opts.absolute ? absTarget : relativeTarget
+
+  chain(
+    [
+      [ensureFromIsNotSource, absTarget, to],
+      [fs, 'stat', absTarget],
+      [rm, to, opts],
+      [mkdir, path.dirname(to)],
+      [fs, 'symlink', target, to, 'junction']
+    ],
+    cb
+  )
+}