[openwrt/openwrt] procd: create /dev/fd symlink

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch openwrt-23.05:
https://git.openwrt.org/2d812f0b72bdb2f2d4b70a4a9c91821ac42df489

commit 2d812f0b72bdb2f2d4b70a4a9c91821ac42df489
Author: Erik Karlsson <erik.karlsson at genexis.eu>
AuthorDate: Wed Sep 6 12:33:17 2023 +0200

    procd: create /dev/fd symlink
    
    This is needed for ksh/bash style process substitution such as
    <(command) and >(command) which was introduced in ash as of busybox
    version 1.34.0 to work.
    
    Signed-off-by: Erik Karlsson <erik.karlsson at genexis.eu>
    (cherry picked from commit fdce970dbb47a6f91b08bdac21a098e77926549f)
---
 package/system/procd/Makefile           | 2 +-
 package/system/procd/files/hotplug.json | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/package/system/procd/Makefile b/package/system/procd/Makefile
index 9e829a2159..d0576c1259 100644
--- a/package/system/procd/Makefile
+++ b/package/system/procd/Makefile
@@ -8,7 +8,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=procd
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(PROJECT_GIT)/project/procd.git
diff --git a/package/system/procd/files/hotplug.json b/package/system/procd/files/hotplug.json
index b930b307a4..9fecddae6b 100644
--- a/package/system/procd/files/hotplug.json
+++ b/package/system/procd/files/hotplug.json
@@ -11,6 +11,7 @@
 						[ "eq", "DEVNAME", "null" ],
 						[
 							[ "makedev", "/dev/%DEVNAME%", "0666" ],
+							[ "exec", "/bin/ln", "-s", "/proc/self/fd", "/dev/fd" ],
 							[ "exec", "/bin/ln", "-s", "/proc/self/fd/0", "/dev/stdin" ],
 							[ "exec", "/bin/ln", "-s", "/proc/self/fd/1", "/dev/stdout" ],
 							[ "exec", "/bin/ln", "-s", "/proc/self/fd/2", "/dev/stderr" ],