From 6fd6795bc4faed644c5f3abafdcb21638a119342 Mon Sep 17 00:00:00 2001
From: Tom Hubrecht <github@mail.hubrecht.ovh>
Date: Tue, 28 May 2024 10:50:54 +0200
Subject: util.{hh,cc}: Split out environment-variables.{hh,cc}

Change-Id: Icff0aa33fda5147bd5dbe256a0b9d6a6c8a2c3f6
---
 src/libutil/environment-variables.hh | 42 ++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 src/libutil/environment-variables.hh

(limited to 'src/libutil/environment-variables.hh')

diff --git a/src/libutil/environment-variables.hh b/src/libutil/environment-variables.hh
new file mode 100644
index 000000000..784b95921
--- /dev/null
+++ b/src/libutil/environment-variables.hh
@@ -0,0 +1,42 @@
+#pragma once
+/**
+ * @file
+ *
+ * Utilities for working with the current process's environment
+ * variables.
+ */
+
+#include <map>
+#include <optional>
+#include <string>
+
+
+namespace nix {
+
+/**
+ * @return an environment variable.
+ */
+std::optional<std::string> getEnv(const std::string & key);
+
+/**
+ * @return a non empty environment variable. Returns nullopt if the env
+ * variable is set to ""
+ */
+std::optional<std::string> getEnvNonEmpty(const std::string & key);
+
+/**
+ * Get the entire environment.
+ */
+std::map<std::string, std::string> getEnv();
+
+/**
+ * Clear the environment.
+ */
+void clearEnv();
+
+/**
+ * Replace the entire environment with the given one.
+ */
+void replaceEnv(const std::map<std::string, std::string> & newEnv);
+
+}
-- 
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