From cb5cbc4d84d84e8199d58740e0e7ed3c6d3ba473 Mon Sep 17 00:00:00 2001
From: Robert Schumacher <roschuma@microsoft.com>
Date: Mon, 3 Apr 2017 10:44:14 -0700
Subject: [PATCH] [vcpkg-env] Added internal 'env' command to help diagnose
 environment issues.

---
 toolsrc/include/vcpkg_Commands.h            |  7 +++++++
 toolsrc/src/commands_available_commands.cpp |  1 +
 toolsrc/src/commands_build.cpp              |  9 ++++++++-
 toolsrc/src/commands_env.cpp                | 17 +++++++++++++++++
 toolsrc/vcpkglib/vcpkglib.vcxproj           |  1 +
 toolsrc/vcpkglib/vcpkglib.vcxproj.filters   |  3 +++
 6 files changed, 37 insertions(+), 1 deletion(-)
 create mode 100644 toolsrc/src/commands_env.cpp

diff --git a/toolsrc/include/vcpkg_Commands.h b/toolsrc/include/vcpkg_Commands.h
index d73181bf4f..23575ca234 100644
--- a/toolsrc/include/vcpkg_Commands.h
+++ b/toolsrc/include/vcpkg_Commands.h
@@ -29,6 +29,8 @@ namespace vcpkg::Commands
         std::string create_error_message(const BuildResult build_result, const package_spec& spec);
         std::string create_user_troubleshooting_message(const package_spec& spec);
 
+        std::wstring make_build_env_cmd(const triplet& target_triplet, const toolset_t& toolset);
+
         BuildResult build_package(const SourceParagraph& source_paragraph, const package_spec& spec, const vcpkg_paths& paths, const fs::path& port_dir, const StatusParagraphs& status_db);
         void perform_and_exit(const package_spec& spec, const fs::path& port_dir, const std::unordered_set<std::string>& options, const vcpkg_paths& paths);
         void perform_and_exit(const vcpkg_cmd_arguments& args, const vcpkg_paths& paths, const triplet& default_target_triplet);
@@ -69,6 +71,11 @@ namespace vcpkg::Commands
         void perform_and_exit(const vcpkg_cmd_arguments& args, const vcpkg_paths& paths);
     }
 
+    namespace Env
+    {
+        void perform_and_exit(const vcpkg_cmd_arguments& args, const vcpkg_paths& paths, const triplet& default_triplet);
+    }
+
     namespace Create
     {
         void perform_and_exit(const vcpkg_cmd_arguments& args, const vcpkg_paths& paths);
diff --git a/toolsrc/src/commands_available_commands.cpp b/toolsrc/src/commands_available_commands.cpp
index 4c7e0df2c6..70e528704a 100644
--- a/toolsrc/src/commands_available_commands.cpp
+++ b/toolsrc/src/commands_available_commands.cpp
@@ -10,6 +10,7 @@ namespace vcpkg::Commands
             { "ci", &CI::perform_and_exit },
             {"remove", &Remove::perform_and_exit},
             {"build", &Build::perform_and_exit},
+            {"env", &Env::perform_and_exit},
             {"build_external", &BuildExternal::perform_and_exit}
         };
         return t;
diff --git a/toolsrc/src/commands_build.cpp b/toolsrc/src/commands_build.cpp
index 8791ef1c10..3c3fbeb662 100644
--- a/toolsrc/src/commands_build.cpp
+++ b/toolsrc/src/commands_build.cpp
@@ -25,6 +25,13 @@ namespace vcpkg::Commands::Build
         std::ofstream(binary_control_file) << bpgh;
     }
 
+    std::wstring make_build_env_cmd(const triplet& target_triplet, const toolset_t& toolset)
+    {
+        return Strings::wformat(LR"("%s" %s >nul 2>&1)",
+            toolset.vcvarsall.native(),
+            Strings::utf8_to_utf16(target_triplet.architecture()));
+    }
+
     BuildResult build_package(const SourceParagraph& source_paragraph, const package_spec& spec, const vcpkg_paths& paths, const fs::path& port_dir, const StatusParagraphs& status_db)
     {
         Checks::check_exit(VCPKG_LINE_INFO, spec.name() == source_paragraph.name, "inconsistent arguments to build_package()");
@@ -43,7 +50,7 @@ namespace vcpkg::Commands::Build
 
         const fs::path ports_cmake_script_path = paths.ports_cmake;
         const toolset_t& toolset = paths.get_toolset();
-        const std::wstring cmd_set_environment = Strings::wformat(LR"("%s" %s >nul 2>&1)", toolset.vcvarsall.native(), Strings::utf8_to_utf16(target_triplet.architecture()));
+        const auto cmd_set_environment = make_build_env_cmd(target_triplet, toolset);
 
         const std::wstring cmd_launch_cmake = make_cmake_cmd(cmake_exe_path, ports_cmake_script_path,
                                                              {
diff --git a/toolsrc/src/commands_env.cpp b/toolsrc/src/commands_env.cpp
new file mode 100644
index 0000000000..314afb779b
--- /dev/null
+++ b/toolsrc/src/commands_env.cpp
@@ -0,0 +1,17 @@
+#include "pch.h"
+#include "vcpkg_Commands.h"
+#include "vcpkg_System.h"
+
+namespace vcpkg::Commands::Env
+{
+    void perform_and_exit(const vcpkg_cmd_arguments& args, const vcpkg_paths& paths, const triplet& default_triplet)
+    {
+        static const std::string example = Commands::Help::create_example_string(R"(env --triplet x64-windows)");
+        args.check_exact_arg_count(0, example);
+        args.check_and_get_optional_command_arguments({});
+
+        System::cmd_execute_clean(Build::make_build_env_cmd(default_triplet, paths.get_toolset()) + L" && cmd");
+
+        Checks::exit_success(VCPKG_LINE_INFO);
+    }
+}
diff --git a/toolsrc/vcpkglib/vcpkglib.vcxproj b/toolsrc/vcpkglib/vcpkglib.vcxproj
index d79c77a940..9234f9c773 100644
--- a/toolsrc/vcpkglib/vcpkglib.vcxproj
+++ b/toolsrc/vcpkglib/vcpkglib.vcxproj
@@ -185,6 +185,7 @@
     <ClCompile Include="..\include\version_t.cpp" />
     <ClCompile Include="..\src\BinaryParagraph.cpp" />
     <ClCompile Include="..\src\commands_ci.cpp" />
+    <ClCompile Include="..\src\commands_env.cpp" />
     <ClCompile Include="..\src\LineInfo.cpp" />
     <ClCompile Include="..\src\paragraph_parse_result.cpp" />
     <ClCompile Include="..\src\PostBuildLint_BuildInfo.cpp" />
diff --git a/toolsrc/vcpkglib/vcpkglib.vcxproj.filters b/toolsrc/vcpkglib/vcpkglib.vcxproj.filters
index acfecbcc50..9901bcd953 100644
--- a/toolsrc/vcpkglib/vcpkglib.vcxproj.filters
+++ b/toolsrc/vcpkglib/vcpkglib.vcxproj.filters
@@ -177,6 +177,9 @@
     <ClCompile Include="..\include\version_t.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="..\src\commands_env.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\include\package_spec.h">