06 - atomic update

examples/simulations/interrupted-installation/main.cpp

@@ -0,0 +1,49 @@
+#include "simulation.hpp"
+
+#include <exception>
+#include <iostream>
+#include <stdexcept>
+#include <string>
+
+namespace model = ota::installation;
+
+int main(int argc, char **argv) {
+    if (argc == 2 && std::string(argv[1]) == "--help") {
+        std::cout << "Usage: installation-simulate [all|--help]\n";
+        return 0;
+    }
+    if (argc > 2 || (argc == 2 && std::string(argv[1]) != "all")) {
+        std::cerr << "Usage: installation-simulate [all|--help]\n";
+        return 1;
+    }
+    try {
+        for (int cut = 0; cut <= model::installation_steps; ++cut) {
+            model::Storage storage;
+            {
+                model::Installer installer(storage);
+                for (int step = 0; step < cut; ++step) model::perform_step(installer, step);
+            }
+            model::Installer restarted(storage);
+            const auto action = restarted.recover();
+            std::cout << "Reset after " << cut << " steps: boot=" << model::boot_choice(storage.boot)
+                      << "; " << model::name(action) << '\n';
+        }
+        for (const auto result: {model::WriteResult::OldRecord, model::WriteResult::NewRecord, model::WriteResult::InvalidRecord}) {
+            model::Storage storage;
+            {
+                model::Installer installer(storage);
+                for (int step = 0; step < 5; ++step) model::perform_step(installer, step);
+                try {
+                    installer.request_trial(result);
+                } catch (const std::runtime_error &error) {
+                    std::cout << error.what() << '\n';
+                }
+            }
+            model::Installer restarted(storage);
+            std::cout << "Boot-state write outcome: " << model::name(restarted.recover()) << '\n';
+        }
+    } catch (const std::exception &error) {
+        std::cerr << error.what() << '\n';
+        return 1;
+    }
+}