From f6c122aaeb08cc3d9e89465b440b25c7e0c87d9e Mon Sep 17 00:00:00 2001
From: Daiderd Jordan <daiderd@gmail.com>
Date: Fri, 20 Mar 2020 21:58:45 +0100
Subject: [PATCH] sandbox: allow pty devices

Nix now runs builds with a pseudo-terminal to enable colored build
output.
---
 src/libstore/sandbox-defaults.sb | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/libstore/sandbox-defaults.sb b/src/libstore/sandbox-defaults.sb
index 0299d1ee45d..c09ce17296f 100644
--- a/src/libstore/sandbox-defaults.sb
+++ b/src/libstore/sandbox-defaults.sb
@@ -71,6 +71,12 @@
        (literal "/dev/zero")
        (subpath "/dev/fd"))
 
+; Allow pseudo-terminals.
+(allow file*
+       (literal "/dev/ptmx")
+       (regex #"^/dev/pty[a-z]+")
+       (regex #"^/dev/ttys[0-9]+"))
+
 ; Does nothing, but reduces build noise.
 (allow file* (literal "/dev/dtracehelper"))