From 9c4c0f89a5208ed5e994c988cbae2ea47d3a45b3 Mon Sep 17 00:00:00 2001
From: Alyssa Ross <hi@alyssa.is>
Date: Tue, 7 Dec 2021 23:49:25 +0000
Subject: [PATCH] vmTools.runInLinuxVM: create fd symlinks in /dev

These are usually set up by systemd, but there's no systemd in the
VM.  /dev/fd is required for <(...) syntax in bash, and I'm sure lots
of things depend on the stdin/stdout/stderr links as well.
---
 pkgs/build-support/vm/default.nix | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkgs/build-support/vm/default.nix b/pkgs/build-support/vm/default.nix
index 7b517333d9e3..20df74d3666d 100644
--- a/pkgs/build-support/vm/default.nix
+++ b/pkgs/build-support/vm/default.nix
@@ -90,6 +90,10 @@ rec {
     done
 
     mount -t devtmpfs devtmpfs /dev
+    ln -s /proc/self/fd /dev/fd
+    ln -s /proc/self/fd/0 /dev/stdin
+    ln -s /proc/self/fd/1 /dev/stdout
+    ln -s /proc/self/fd/2 /dev/stderr
 
     ifconfig lo up