From ca73360bb710b9975d63e07058e565c828dfdebf Mon Sep 17 00:00:00 2001
From: Sergei Trofimovich <slyich@gmail.com>
Date: Thu, 2 Nov 2023 17:20:32 +0000
Subject: [PATCH] net-snmp: drop build-only references from the closure

Before the change `net-snmp` embedded it's `./configure` options as is
and retained unneeded dependencies:

    $ nix path-info -rSh $(nix-build -A net-snmp.lib) | nl |& unnix
     1  /<<NIX>>/libunistring-1.1          1.8M
     2  /<<NIX>>/xgcc-12.3.0-libgcc      139.1K
     3  /<<NIX>>/libidn2-2.3.4             2.1M
     4  /<<NIX>>/glibc-2.38-23            31.1M
     5  /<<NIX>>/net-snmp-5.9.4            1.7M
     6  /<<NIX>>/bash-5.2-p15             32.6M
     7  /<<NIX>>/openssl-3.0.11           37.3M
     8  /<<NIX>>/openssl-3.0.11-bin       39.8M
     9  /<<NIX>>/openssl-3.0.11-dev       41.7M
    10  /<<NIX>>/net-snmp-5.9.4-lib       46.2M

After the change the closure skips `openssl.dev` input and gets rid of
5MB of closure:

    $ nix path-info -rSh $(nix-build -A net-snmp.lib) | nl |& unnix
     1  /<<NIX>>/libunistring-1.1          1.8M
     2  /<<NIX>>/xgcc-12.3.0-libgcc      139.1K
     3  /<<NIX>>/libidn2-2.3.4             2.1M
     4  /<<NIX>>/glibc-2.38-23            31.1M
     5  /<<NIX>>/net-snmp-5.9.4            1.7M
     6  /<<NIX>>/openssl-3.0.11           37.3M
     7  /<<NIX>>/net-snmp-5.9.4-lib       41.8M
---
 pkgs/servers/monitoring/net-snmp/default.nix | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/pkgs/servers/monitoring/net-snmp/default.nix b/pkgs/servers/monitoring/net-snmp/default.nix
index 638d7fad330c..8961bc549535 100644
--- a/pkgs/servers/monitoring/net-snmp/default.nix
+++ b/pkgs/servers/monitoring/net-snmp/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, fetchpatch, removeReferencesTo
+{ lib, stdenv, fetchurl, fetchpatch
 , file, openssl, perl, perlPackages, nettools
 , withPerlTools ? false }: let
 
@@ -45,7 +45,14 @@ in stdenv.mkDerivation rec {
     substituteInPlace testing/fulltests/support/simple_TESTCONF.sh --replace "/bin/netstat" "${nettools}/bin/netstat"
   '';
 
-  nativeBuildInputs = [ nettools removeReferencesTo file ];
+  postConfigure = ''
+    # libraries contain configure options. Mangle store paths out from
+    # ./configure-generated file.
+    sed -i include/net-snmp/net-snmp-config.h \
+      -e "/NETSNMP_CONFIGURE_OPTIONS/ s|$NIX_STORE/[a-z0-9]\{32\}-|$NIX_STORE/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-|g"
+  '';
+
+  nativeBuildInputs = [ nettools file ];
   buildInputs = [ openssl ]
     ++ lib.optional withPerlTools perlWithPkgs;
 
@@ -61,9 +68,6 @@ in stdenv.mkDerivation rec {
     done
     mkdir $dev/bin
     mv $bin/bin/net-snmp-config $dev/bin
-    # libraries contain configure options
-    find $lib/lib -type f -exec remove-references-to -t $bin '{}' +
-    find $lib/lib -type f -exec remove-references-to -t $dev '{}' +
   '';
 
   meta = with lib; {