Merge changes from topic "libutil-split" into main

* changes:
  util.hh: Delete remaining file and clean up headers
  util.hh: Move nativeSystem to local-derivation-goal.cc
  util.hh: Move stuff to types.hh
  util.cc: Delete remaining file
  util.{hh,cc}: Move ignoreException to error.{hh,cc}
  util.{hh,cc}: Split out namespaces.{hh,cc}
  util.{hh,cc}: Split out users.{hh,cc}
  util.{hh,cc}: Split out strings.{hh,cc}
  util.{hh,cc}: Split out unix-domain-socket.{hh,cc}
  util.{hh,cc}: Split out child.{hh,cc}
  util.{hh,cc}: Split out current-process.{hh,cc}
  util.{hh,cc}: Split out processes.{hh,cc}
  util.{hh,cc}: Split out file-descriptor.{hh,cc}
  util.{hh,cc}: Split out file-system.{hh,cc}
  util.{hh,cc}: Split out terminal.{hh,cc}
  util.{hh,cc}: Split out environment-variables.{hh,cc}

7 files changed, 12 insertions, 9 deletions

diff --git a/tests/unit/libcmd/args.cc b/tests/unit/libcmd/args.cc
index 73550dacf..886467ea0 100644
--- a/tests/unit/libcmd/args.cc
+++ b/tests/unit/libcmd/args.cc
@@ -10,7 +10,6 @@
 #include "filetransfer.hh"
 #include "shared.hh"
 #include "store-api.hh"
-#include "util.hh"
 
 constexpr std::string_view INVALID_CHANNEL = "channel:example";
 constexpr std::string_view CHANNEL_URL = "https://nixos.org/channels/example/nixexprs.tar.xz";
diff --git a/tests/unit/libstore-support/tests/test-data.hh b/tests/unit/libstore-support/tests/test-data.hh
index 7aa1dd90d..1fec6f912 100644
--- a/tests/unit/libstore-support/tests/test-data.hh
+++ b/tests/unit/libstore-support/tests/test-data.hh
@@ -1,6 +1,6 @@
 #pragma once
 
-#include "util.hh"
+#include "environment-variables.hh"
 #include "types.hh"
 
 namespace nix {
diff --git a/tests/unit/libstore/machines.cc b/tests/unit/libstore/machines.cc
index 0277237bb..ba27d85b7 100644
--- a/tests/unit/libstore/machines.cc
+++ b/tests/unit/libstore/machines.cc
@@ -1,5 +1,7 @@
+#include "file-system.hh"
 #include "machines.hh"
 #include "globals.hh"
+#include "strings.hh"
 #include "tests/test-data.hh"
 
 #include <gmock/gmock-matchers.h>
diff --git a/tests/unit/libutil-support/tests/characterization.hh b/tests/unit/libutil-support/tests/characterization.hh
index 7f570f619..db82476da 100644
--- a/tests/unit/libutil-support/tests/characterization.hh
+++ b/tests/unit/libutil-support/tests/characterization.hh
@@ -1,11 +1,13 @@
 #pragma once
 ///@file
 
+#include "environment-variables.hh"
+#include "file-system.hh"
+
 #include <gtest/gtest.h>
 
 #include <filesystem>
 
-#include "util.hh"
 #include "types.hh"
 
 namespace nix {
diff --git a/tests/unit/libutil-support/tests/cli-literate-parser.cc b/tests/unit/libutil-support/tests/cli-literate-parser.cc
index 822f5e276..f74fe85eb 100644
--- a/tests/unit/libutil-support/tests/cli-literate-parser.cc
+++ b/tests/unit/libutil-support/tests/cli-literate-parser.cc
@@ -3,7 +3,6 @@
 #include "escape-char.hh"
 #include "libexpr/print.hh"
 #include "types.hh"
-#include "util.hh"
 #include <ranges>
 #include <boost/algorithm/string/replace.hpp>
 #include <boost/algorithm/string/trim.hpp>
@@ -18,7 +17,7 @@
 #include "libexpr/print.hh"
 #include "shlex.hh"
 #include "types.hh"
-#include "util.hh"
+#include "strings.hh"
 
 static constexpr const bool DEBUG_PARSER = false;
 
diff --git a/tests/unit/libutil/logging.cc b/tests/unit/libutil/logging.cc
index 94cbe9c51..f99f49527 100644
--- a/tests/unit/libutil/logging.cc
+++ b/tests/unit/libutil/logging.cc
@@ -2,7 +2,6 @@
 
 #include "logging.hh"
 #include "nixexpr.hh"
-#include "util.hh"
 #include <fstream>
 
 #include <gtest/gtest.h>
diff --git a/tests/unit/libutil/tests.cc b/tests/unit/libutil/tests.cc
index 720370066..9a44ad59b 100644
--- a/tests/unit/libutil/tests.cc
+++ b/tests/unit/libutil/tests.cc
@@ -1,14 +1,16 @@
-#include "util.hh"
+#include "file-system.hh"
+#include "processes.hh"
+#include "strings.hh"
 #include "types.hh"
+#include "terminal.hh"
 
-#include <limits.h>
 #include <gtest/gtest.h>
 
 #include <numeric>
 
 namespace nix {
 
-/* ----------- tests for util.hh ------------------------------------------------*/
+/* ----------- tests for libutil ------------------------------------------------*/
 
     /* ----------------------------------------------------------------------------
      * absPath