From 14edb7097f189ad8c400d1e8bfc36b3ffc67f67e Mon Sep 17 00:00:00 2001
From: Daniel Pfeifer <daniel@pfeifer-mail.de>
Date: Thu, 5 Mar 2026 23:14:45 +0100
Subject: [PATCH] cmUVProcessChain: Add support for Environment

---
 Source/cmUVProcessChain.cxx | 17 +++++++++++++++++
 Source/cmUVProcessChain.h   |  2 ++
 2 files changed, 19 insertions(+)

diff --git a/Source/cmUVProcessChain.cxx b/Source/cmUVProcessChain.cxx
index 05d93613e4..44fd85251e 100644
--- a/Source/cmUVProcessChain.cxx
+++ b/Source/cmUVProcessChain.cxx
@@ -159,6 +159,13 @@ cmUVProcessChainBuilder& cmUVProcessChainBuilder::SetWorkingDirectory(
   return *this;
 }
 
+cmUVProcessChainBuilder& cmUVProcessChainBuilder::SetEnvironment(
+  std::vector<std::string> env)
+{
+  this->Environment = std::move(env);
+  return *this;
+}
+
 cmUVProcessChainBuilder& cmUVProcessChainBuilder::SetDetached()
 {
   this->Detached = true;
@@ -370,6 +377,16 @@ void cmUVProcessChain::InternalData::SpawnProcess(
     options.cwd = this->Builder->WorkingDirectory.c_str();
   }
 
+  auto env = std::vector<char const*>{};
+  if (!this->Builder->Environment.empty()) {
+    env.reserve(this->Builder->Environment.size() + 1);
+    for (auto const& var : this->Builder->Environment) {
+      env.push_back(var.c_str());
+    }
+    env.push_back(nullptr);
+    options.env = const_cast<char**>(env.data());
+  }
+
   std::array<uv_stdio_container_t, 3> stdio;
   if (first) {
     stdio[0] = this->InputStreamData.Stdio;
diff --git a/Source/cmUVProcessChain.h b/Source/cmUVProcessChain.h
index 2116eb2658..2b9671f7b3 100644
--- a/Source/cmUVProcessChain.h
+++ b/Source/cmUVProcessChain.h
@@ -38,6 +38,7 @@ public:
   cmUVProcessChainBuilder& SetExternalStream(Stream stdio, int fd);
   cmUVProcessChainBuilder& SetExternalStream(Stream stdio, FILE* stream);
   cmUVProcessChainBuilder& SetWorkingDirectory(std::string dir);
+  cmUVProcessChainBuilder& SetEnvironment(std::vector<std::string> env);
   cmUVProcessChainBuilder& SetDetached();
 
   uv_loop_t* GetLoop() const;
@@ -68,6 +69,7 @@ private:
   std::array<StdioConfiguration, 3> Stdio;
   std::vector<ProcessConfiguration> Processes;
   std::string WorkingDirectory;
+  std::vector<std::string> Environment;
   bool MergedBuiltinStreams = false;
   bool Detached = false;
   uv_loop_t* Loop = nullptr;