first commit

Services/SuUserSwitcher.cs

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+using HanaToolbox.Services.Interfaces;
+
+namespace HanaToolbox.Services;
+
+/// <summary>
+/// Wraps a shell command to run as &lt;sid&gt;adm using `su - &lt;sid&gt;adm -c '...'`.
+/// If the current OS user is already &lt;sid&gt;adm, the command is executed directly.
+/// </summary>
+public sealed class SuUserSwitcher(IProcessRunner runner) : IUserSwitcher
+{
+    public async Task<ProcessResult> RunAsAsync(
+        string sid, string shellCommand,
+        CancellationToken ct = default)
+    {
+        var sidAdm = $"{sid.ToLowerInvariant()}adm";
+
+        if (string.Equals(Environment.UserName, sidAdm, StringComparison.OrdinalIgnoreCase))
+        {
+            // Already running as the correct user — run directly via bash
+            return await runner.RunAsync("/bin/bash", ["-c", shellCommand], ct);
+        }
+
+        // Use `su -` to inherit the user's environment (HOME, PATH, etc.)
+        return await runner.RunAsync("/bin/su", ["-", sidAdm, "-c", shellCommand], ct);
+    }
+}