1 files changed, 61 insertions, 0 deletions
diff --git a/node_modules/pacote/lib/extract-stream.js b/node_modules/pacote/lib/extract-stream.js
new file mode 100644
index 000000000..f6f68bc1e
--- /dev/null
+++ b/node_modules/pacote/lib/extract-stream.js
@@ -0,0 +1,61 @@
+'use strict'
+
+const gunzip = require('./util/gunzip-maybe')
+const path = require('path')
+const pipeline = require('mississippi').pipeline
+const tar = require('tar-fs')
+
+module.exports = extractStream
+function extractStream (dest, opts) {
+  opts = opts || {}
+  const sawIgnores = {}
+  return pipeline(gunzip(), tar.extract(dest, {
+    map: (header) => {
+      if (process.platform !== 'win32') {
+        header.uid = opts.uid == null ? header.uid : opts.uid
+        header.gid = opts.gid == null ? header.gid : opts.gid
+      }
+      // Note: This mirrors logic in the fs read operations that are
+      // employed during tarball creation, in the fstream-npm module.
+      // It is duplicated here to handle tarballs that are created
+      // using other means, such as system tar or git archive.
+      if (header.type === 'file') {
+        const base = path.basename(header.name)
+        if (base === '.npmignore') {
+          sawIgnores[header.name] = true
+        } else if (base === '.gitignore') {
+          const npmignore = header.name.replace(/\.gitignore$/, '.npmignore')
+          if (!sawIgnores[npmignore]) {
+            // Rename, may be clobbered later.
+            header.name = npmignore
+          }
+        }
+      }
+      return header
+    },
+    ignore: makeIgnore(opts.log),
+    dmode: opts.dmode,
+    fmode: opts.fmode,
+    umask: opts.umask,
+    strip: 1
+  }))
+}
+
+function makeIgnore (log) {
+  const sawIgnores = {}
+  return (name, header) => _ignore(name, header, sawIgnores, log)
+}
+
+function _ignore (name, header, sawIgnores, logger) {
+  if (header.type.match(/^.*link$/)) {
+    if (logger) {
+      logger.warn(
+        'extract-stream',
+        'excluding symbolic link',
+        header.name, '->', header.linkname)
+    }
+    return true
+  }
+
+  return false
+}