From a004c84e85fa03137afeb08d8f93a6c0df7ed6bf Mon Sep 17 00:00:00 2001
From: Sergei Zimmerman <145775305+xokdvium@users.noreply.github.com>
Date: Tue, 18 Feb 2025 13:01:39 +0300
Subject: [PATCH] Don't override default man search paths

By appending a colon to MANPATH NIX_MAN_DIR gets prepended to the
final MANPATH before default search paths.
This makes man still consider default search paths, but prefers
NIX_MAN_DIR (if it exists).

It still makes sense to point NIX_MAN_DIR to a correct location
by moving man pages build from nix-manual.man to nix-cli.man, but
this should fix most common use-cases where nix is installed globally.

(cherry picked from commit 95f16a3275a3d23afe4f311cb793d7a5d47222e1)
---
 src/nix/man-pages.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/nix/man-pages.cc b/src/nix/man-pages.cc
index a98a771cc..e9e89bb62 100644
--- a/src/nix/man-pages.cc
+++ b/src/nix/man-pages.cc
@@ -13,7 +13,7 @@ std::filesystem::path getNixManDir()
 void showManPage(const std::string & name)
 {
     restoreProcessContext();
-    setEnv("MANPATH", getNixManDir().c_str());
+    setEnv("MANPATH", (getNixManDir().string() + ":").c_str());
     execlp("man", "man", name.c_str(), nullptr);
     if (errno == ENOENT) {
         // Not SysError because we don't want to suffix the errno, aka No such file or directory.