From fadf93033af7314bb0bb34ea94b3f565a2bf34c0 Mon Sep 17 00:00:00 2001
From: Michael Biebl <biebl@debian.org>
Date: Sun, 11 Apr 2021 18:11:58 +0200
Subject: [PATCH] udev-udeb: setup /dev/fd, /dev/std{in,out,err} symlinks

As systemd-udevd no longer sets them up itself, we create them manually
after mounting devtmpfs. This avoids breaking applications which expect
those symlinks.

Closes: #975018
---
 debian/extra/start-udev | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/debian/extra/start-udev b/debian/extra/start-udev
index 60489258e..0a8b284ad 100755
--- a/debian/extra/start-udev
+++ b/debian/extra/start-udev
@@ -6,6 +6,11 @@ fi
 
 if ! grep -E -q "^[^[:space:]]+ /dev devtmpfs" /proc/mounts; then
     mount -n -o mode=0755 -t devtmpfs devtmpfs /dev
+    # Setup a few /dev symlinks, see #975018
+    [ ! -h /dev/fd ] && ln -s /proc/self/fd /dev/fd
+    [ ! -h /dev/stdin ] && ln -s /proc/self/fd/0 /dev/stdin
+    [ ! -h /dev/stdout ] && ln -s /proc/self/fd/1 /dev/stdout
+    [ ! -h /dev/stderr ] && ln -s /proc/self/fd/2 /dev/stderr
 fi
 
 SYSTEMD_LOG_LEVEL=notice /lib/systemd/systemd-udevd --daemon --resolve-names=never