chore: initial project import

backend/agent/src/Monitor.Agent/Program.cs

@@ -0,0 +1,42 @@
+using Fleet.Core;
+using Fleet.Hosting;
+using Monitor.Agent;
+
+TimeProvider time = TimeProvider.System;
+INodeLog log = new ConsoleNodeLog(time);
+
+if (PlatformCheck.VerifyCrypto() is { } problem)
+{
+    log.Error("startup failed", ("err", problem));
+    return 1;
+}
+
+string configPath = "/etc/monitor/agent.json";
+for (int i = 0; i < args.Length - 1; i++)
+{
+    if (args[i] == "--config")
+    {
+        configPath = args[i + 1];
+    }
+}
+
+AgentConfig config;
+LoadedNodeIdentity identity;
+try
+{
+    config = NodeConfig.Load(configPath, AgentConfigContext.Default.AgentConfig);
+    identity = LoadedNodeIdentity.Load(config.Fleet.IdentityDir);
+}
+catch (Exception ex) when (ex is IOException or InvalidDataException or InvalidOperationException or System.Text.Json.JsonException or System.Security.Cryptography.CryptographicException)
+{
+    log.Error("startup failed", ("err", ex.Message));
+    return 1;
+}
+
+using (identity)
+{
+    using var app = new AgentApp(config, identity, time, log);
+    await ServiceShell.RunAsync(app.RunAsync, log);
+}
+
+return 0;