62 lines
2.9 KiB
C#
62 lines
2.9 KiB
C#
 
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using System.Diagnostics;
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using System.Reflection;
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namespace RemSound.App;
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/// <summary>
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/// Lets the running Windows service pick up an app update on its own. The interactive auto-updater
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/// swaps the install files in place (rename-aside, which a running service tolerates) but has no admin
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/// rights to restart the service — so instead the SERVICE, which runs as SYSTEM and DOES have the rights,
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/// notices that a newer RemSound.exe has landed next to it and restarts itself onto the new binary.
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///
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/// <para>Loop-safe by construction: it only restarts when the on-disk version is STRICTLY newer than the
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/// running one, and any uncertainty (file missing mid-swap, unparseable version) means "don't restart".
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/// After the restart the new process's on-disk == running, so it never re-triggers.</para>
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/// </summary>
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internal static class ServiceUpdate
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{
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/// <summary>Pure version comparison, unit-testable: is the on-disk version strictly newer than the
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/// running one? False on any missing/unparseable input (so we never restart on uncertainty).</summary>
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internal static bool IsNewer(Version? running, string? onDiskFileVersion)
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{
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if (running is null || string.IsNullOrWhiteSpace(onDiskFileVersion)) return false;
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return Version.TryParse(onDiskFileVersion, out var onDisk) && onDisk > running;
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}
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/// <summary>True when a strictly-newer RemSound.exe sits next to the running service binary (i.e. an
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/// update landed). Reads the on-disk exe's file version; never throws.</summary>
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public static bool UpdateLanded()
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{
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try
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{
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var onDiskExe = Path.Combine(AppContext.BaseDirectory, "RemSound.exe");
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if (!File.Exists(onDiskExe)) return false;
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var running = Assembly.GetExecutingAssembly().GetName().Version;
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var onDisk = FileVersionInfo.GetVersionInfo(onDiskExe).FileVersion;
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return IsNewer(running, onDisk);
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}
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catch { return false; }
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}
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/// <summary>Restart the service onto the new binary. Spawns a DETACHED PowerShell (as SYSTEM, inherited
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/// from the service) that stops this service — which exits this process — then starts it again, so the
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/// SCM launches the freshly-installed exe. Never throws.</summary>
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public static void RestartSelf()
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{
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try
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{
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var psi = new ProcessStartInfo
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{
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FileName = "powershell.exe",
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Arguments = "-NonInteractive -WindowStyle Hidden -Command " +
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$"\"Stop-Service -Name {ServiceControl.ServiceName} -Force -ErrorAction SilentlyContinue; " +
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$"Start-Service -Name {ServiceControl.ServiceName} -ErrorAction SilentlyContinue\"",
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UseShellExecute = false,
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CreateNoWindow = true,
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};
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Process.Start(psi);
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}
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catch { /* best-effort; worst case the service picks up the update on next reboot */ }
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}
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}
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