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Service: pick up app updates by self-restarting onto the new binary

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Local checkpoint - NOT for public release. Ed: an update should tear down the service,
update it, and restart it. It didn't - the updater has no service awareness.

Current (unchanged, verified correct): the auto-updater renames the install files aside
and copies the new ones in, which a running service TOLERATES (no failed swap). The old
version keeps streaming; the new files sit in place.

New: the service now adopts the update itself. Because it runs as SYSTEM (which has the
rights the non-elevated updater lacks), a 45s timer notices when a strictly-newer
RemSound.exe has landed next to it and restarts itself onto the new binary (detached
PowerShell Stop-Service+Start-Service). Loop-safe: only fires on a strictly-newer on-disk
version; any uncertainty (file mid-swap, unparseable version) means don't restart, and
after the restart on-disk == running so it never re-triggers.

Test "Service registration args" now also covers the version-comparison logic (newer =>
restart; same/older/missing => no restart). Gate 27/27.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Ednunp
2026-07-13 09:38:52 +01:00
co-authored by Claude Opus 4.8
parent 941e0df99f
commit 56dbd0b80f
3 changed files with 88 additions and 1 deletions
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src/RemSound.App/SelfTest.cs
+10 -1
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@@ -682,7 +682,16 @@ internal static class SelfTest
var fail = ServiceControl.BuildFailureArgs();
Check(fail.StartsWith($"failure {ServiceControl.ServiceName} ") && fail.Contains("actions= restart/"),
$"failure args must configure auto-restart (got: {fail})");
return "sc create + failure args are well-formed";
// Self-update version comparison — the service restarts itself ONLY on a strictly-newer on-disk
// version; any other case must be false so it can never loop.
var v = new Version(5, 2, 0, 0);
Check(ServiceUpdate.IsNewer(v, "5.3.0.0"), "a strictly-newer on-disk version must trigger a self-update");
Check(!ServiceUpdate.IsNewer(v, "5.2.0.0"), "the same version must NOT trigger a restart (loop-safe)");
Check(!ServiceUpdate.IsNewer(v, "5.1.0.0"), "an older on-disk version must NOT trigger a restart");
Check(!ServiceUpdate.IsNewer(v, null) && !ServiceUpdate.IsNewer(v, "garbage") && !ServiceUpdate.IsNewer(null, "5.3"),
"missing/unparseable versions must NOT trigger a restart");
return "sc create + failure args well-formed; self-update comparison loop-safe";
}
/// <summary>The service profile is fully isolated from the normal profile machinery: it lives in a