Add extracted tools: CitrineOS, OpenOCPP, ShapeShifter

- CitrineOS core extracted (CSMS OCPP 2.0.1)
- OpenOCPP extracted (firmware OCPP 1.6J/2.0.1)
- ShapeShifter library installed (pip install -e)
- ShapeShifter specification extracted
- EVerest extracted

TODO updated with progress

tools/EVerest-main/lib/everest/framework/src/system_unix.hpp

@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright 2020 - 2023 Pionix GmbH and Contributors to EVerest
+
+#pragma once
+
+#include <cstddef>
+#include <string>
+#include <vector>
+
+#include <sys/types.h>
+
+namespace Everest::system {
+
+class SubProcess {
+public:
+    static SubProcess create(const std::string& run_as_user, const std::vector<std::string>& capabilities = {});
+    bool is_child() const {
+        return this->pid == 0;
+    }
+
+    void send_error_and_exit(const std::string& message);
+
+    pid_t check_child_executed();
+
+private:
+    const std::size_t MAX_PIPE_MESSAGE_SIZE = 1024;
+    SubProcess(int fd, pid_t pid) : fd(fd), pid(pid){};
+    int fd{};
+    pid_t pid{0};
+    bool check_child_executed_done{false};
+};
+
+bool keep_caps();
+
+std::string set_caps(const std::vector<std::string>& capabilities);
+
+std::string set_real_user(const std::string& user_name);
+
+std::string set_user_and_capabilities(const std::string& run_as_user, const std::vector<std::string>& capabilities);
+
+} // namespace Everest::system