Index: node_modules/tar/lib/mode-fix.js
===================================================================
--- node_modules/tar/lib/mode-fix.js	(revision 81bc7da776d8cda42939ef4ab350c88d13b4941f)
+++ node_modules/tar/lib/mode-fix.js	(revision 81bc7da776d8cda42939ef4ab350c88d13b4941f)
@@ -0,0 +1,27 @@
+'use strict'
+module.exports = (mode, isDir, portable) => {
+  mode &= 0o7777
+
+  // in portable mode, use the minimum reasonable umask
+  // if this system creates files with 0o664 by default
+  // (as some linux distros do), then we'll write the
+  // archive with 0o644 instead.  Also, don't ever create
+  // a file that is not readable/writable by the owner.
+  if (portable) {
+    mode = (mode | 0o600) & ~0o22
+  }
+
+  // if dirs are readable, then they should be listable
+  if (isDir) {
+    if (mode & 0o400) {
+      mode |= 0o100
+    }
+    if (mode & 0o40) {
+      mode |= 0o10
+    }
+    if (mode & 0o4) {
+      mode |= 0o1
+    }
+  }
+  return mode
+}