Merge pull request #281 from saphid/fix/framey-stale-installed-receipt

Framey: reject stale plugin update and remove requests

app/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "frame-control",
-  "version": "0.4.38",
+  "version": "0.4.39",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "frame-control",
-      "version": "0.4.38",
+      "version": "0.4.39",
       "license": "MIT",
       "devDependencies": {
         "electron": "^44.4.5",

app/package.json

@@ -1,7 +1,7 @@
 {
   "name": "frame-control",
   "productName": "Frame Control",
-  "version": "0.4.38",
+  "version": "0.4.39",
   "description": "Desktop app for managing a Valve Steam Frame over SSH",
   "private": true,
   "main": "main.js",

docs/current-support-matrix.md

@@ -1,11 +1,11 @@
 # What we have tested
 
-Current for Frame Control **v0.4.38**, 26 October 2026. “Real Frame + physical PC” means an actual headset and a non-virtual computer. “VM only” means a Windows virtual machine, sometimes connected to the real Frame. A CI test or a simulated device is **not** a physical hardware test. The date/version column is the last relevant check, not a promise that every new release was retested on that platform. See each link for the exact procedure and limits.
+Current for Frame Control **v0.4.39**, 26 October 2026. “Real Frame + physical PC” means an actual headset and a non-virtual computer. “VM only” means a Windows virtual machine, sometimes connected to the real Frame. A CI test or a simulated device is **not** a physical hardware test. The date/version column is the last relevant check, not a promise that every new release was retested on that platform. See each link for the exact procedure and limits.
 
 | Feature | Real Frame + physical PC tested | VM only | Untested or limited | Last check and proof |
 |---|---|---|---|---|
 | Mac desktop release — tested on a real Mac | Physical MacBook Air (MacBookAir9,1), Intel Core i3, macOS 15.7.7 (24G720): v0.4.35/v0.4.36 DMGs verified and installed; both fail to launch because they are ARM64-only. Separate Intel candidate launched: UI, native preference read/write (restored), bundled Python logs, latest-version check and offline OBS Start/Stop checked; released UI browsed 116 Decky store entries | No | Candidate results are not released-build acceptance. Native Open at Login state, Gatekeeper override, real OBS/Frame stream, native settings across restart, headset transfer and wearer interaction remain unverified | 26 Oct, v0.4.35/v0.4.36 and Intel candidate `6ea9eb2`: [real-Mac evidence](evidence/mac-desktop-2026-10-26.md) |
-| Core title smoke test | Linux lxso2 installed and removed reserved native/Proton titles on the real Frame; all 13 steps passed. ARM64 and Windows titles launched | No | The x86_64 title could not launch because Steam Linux Runtime 4.0 was not installed. The headset was unworn; visible rendering and controller input were not checked. Other feature paths retain their separate limits below | 26 Oct, v0.4.37 tag `5239dae`, Frame OS 0.5.6 build `20261022.6153909`: [release smoke evidence](evidence/v0437-release-smoke-2026-10-26.md); [earlier detailed results](evidence/round2-smoke-2026-10-25.json) |
+| Core title smoke test | Linux lxso2 installed and removed reserved native/Proton titles on the real Frame; all 13 steps passed. ARM64 and Windows titles launched | No | The x86_64 title could not launch because Steam Linux Runtime 4.0 was not installed. The headset was unworn; visible rendering and controller input were not checked. Other feature paths retain their separate limits below | 26 Oct, v0.4.38 exact tag `d87b863`, Frame OS 0.5.6 build `20261022.6153909`: [latest release smoke](evidence/v0438-release-smoke-2026-10-26.md); [earlier detailed results](evidence/round2-smoke-2026-10-25.json) |
 | Windows desktop in the headset | No physical Windows PC test | Windows 11 VM sent a whole desktop to a real Frame; this used an intermediate fix, not the final native DLL | Physical GPU, capture and controller input; individual windows unavailable in bundled DXGI build | 24 Oct, v0.4.10 installer + candidate fix: [VM log](evidence/windows-vm-2026-10-24.md), [PC guide](pc-in-headset.md) |
 | Linux desktop in the headset | No | No | Native Linux PC capture is disabled; lxso2 lacked a desktop portal and PipeWire session. The separate Steam `-pipewire` helper is not Frame Control's PC capture | 24 Oct, v0.4.17: [host audit](evidence/linux-pc-host-lxso2-2026-10-24.md), [Steam helper PR #163](https://github.com/saphid/frame-control/pull/163) |
 | Mac desktop in the headset | A physical Mac sent its screen/window to a real Frame | No | Current v0.4.26 Mac installer and worn-headset controller input have not been repeated | 28 Sep, pre-v0.4 / Frame OS 0.4.1: [Mac guide and measurement](streaming.md#b-show-the-macs-desktop-inside-the-frame) |
@@ -23,8 +23,8 @@ Current for Frame Control **v0.4.38**, 26 October 2026. “Real Frame + physical
 | Passthrough in recordings | Real room pixels in OBS and a production MP4 after safe SteamVR wake | No | **Yes** for the checked 0.5.6 mirror. Raw cameras are not opened. Other games/modes and Steam clips may differ | 25 Oct: [validation](evidence/obs-validation-2026-10-25.md), [recording guide](recording.md#does-record-include-passthrough) |
 | Open at login | No Frame needed; Linux autostart file toggled on a physical Linux host with an isolated config directory | No | A full login session and physical Windows/macOS host login have not been checked; OS API calls were unit tested | 25 Oct, v0.4.26: [PR #189](https://github.com/saphid/frame-control/pull/189) |
 | Local Frame Control extensions | Example panel displayed live Frame status in a browser preview; the real Frame served a read-only example in the experimental headset panel | No | No wearer-visible extension view; third-party extensions and physical Windows/macOS extension folders untested | 25 Oct, v0.4.29: [PR #194](https://github.com/saphid/frame-control/pull/194), [PR #201](https://github.com/saphid/frame-control/pull/201), [extension guide](extensions.md) |
-| Experimental Frame Control SteamVR panel | Frame OS 0.5.6 registered and served the opt-in overlay. A later unattended check safely woke SteamVR and found the panel in stereo compositor and mirror captures; it removed its temporary service and restored power settings | No | No person wore the headset for that check. Physical controller input, scrolling, VR keyboard, comfort and legibility remain unverified. The large status view has browser and packaging checks, not a wearer review | 25 Oct, v0.4.29–0.4.37: [panel PR #201](https://github.com/saphid/frame-control/pull/201), [unattended evidence](evidence/framey-vr-2026-10-25/README.md), [worn checklist](framey-vr-check.md) |
-| Experimental Decky Loader manager | Frame OS 0.5.6 ARM64 user-service install/status/update/remove and managed ProtonDB install/update/remove passed earlier. A private Decky 3.3.0 service returned read-only ProtonDB and Steam Status setting RPCs; a later locked check verified the official Notebook default drawing/save/reopen flow and Simple Timer backend events in local Chromium | No | The loader remains opt-in. Installs/updates reject an archive whose Decky name collides with another installed plugin before download and under the headset transaction lock; this safety path has host/fake Frame tests, not a new real-headset collision test. The exact-version official catalog covers 116 plugins: 1 works (Notebook default flow only), 44 partial, 60 broken and 11 not applicable. Most official backends and VR controls remain unverified. Physical controller use and wearer-visible official panels remain unverified | 26 Oct, v0.4.31–0.4.38: [managed store PR #208](https://github.com/saphid/frame-control/pull/208), [name-collision PR #269](https://github.com/saphid/frame-control/pull/269), [catalog PR #266](https://github.com/saphid/frame-control/pull/266), [backend event evidence](evidence/framey-events-backend-2026-10-26.json), [compatibility table](framey-compatibility.md) |
-| Experimental Framey VR plugin panels and store | An unattended Frame OS 0.5.6 run showed the Framey sample panel in stereo compositor and mirror captures. Synthetic OpenVR clicks changed a live sample setting, read its Decky backend file and confirmed it after a fresh iframe reopen | No | This was the repository sample, not an official store plugin. Physical controllers, native scrolling, VR keyboard, wearer comfort and legibility remain unverified. CSS Loader and SteamGridDB exact archives passed fake Frame install/remove and panel packing; this does not establish theme or artwork controls in VR. Panel-local backend events and React toasts have local/real-backend checks, but no wearer review. Pause Games and Tailscale Control settings render in local Chromium; their live actions are unverified. The 116-plugin catalog had 60 fake installs/removals and 56 expected blocks; 98 local Chromium initializers were ready and 18 failed. Notebook is marked works only for its default drawing/save/reopen flow | 26 Oct, v0.4.38: [unattended sample evidence](evidence/framey-vr-2026-10-25/README.md), [backend event PR #270](https://github.com/saphid/frame-control/pull/270), [settings/cache PR #271](https://github.com/saphid/frame-control/pull/271), [worn checklist](framey-vr-check.md) |
+| Experimental Frame Control SteamVR panel | Frame OS 0.5.6 registered and served the opt-in overlay. A later unattended check safely woke SteamVR and found the panel in stereo compositor and mirror captures; it removed its temporary service and restored power settings | No | No person wore the headset for that check. Physical controller input, scrolling, VR keyboard, comfort and legibility remain unverified. The large status view has browser and packaging checks, not a wearer review | 26 Oct, v0.4.29–0.4.39: [panel PR #201](https://github.com/saphid/frame-control/pull/201), [unattended evidence](evidence/framey-vr-2026-10-25/README.md), [new standby-gated exercise](evidence/framey-vr-standby-gate-2026-10-26.md), [worn checklist](framey-vr-check.md) |
+| Experimental Decky Loader manager | Frame OS 0.5.6 ARM64 user-service install/status/update/remove and managed ProtonDB install/update/remove passed earlier. A private Decky 3.3.0 service returned read-only ProtonDB and Steam Status setting RPCs; a later locked check verified the official Notebook default drawing/save/reopen flow and Simple Timer backend events in local Chromium | No | The loader remains opt-in. Installs/updates reject an archive whose Decky name collides with another installed plugin before download and under the headset transaction lock; this safety path has host/fake Frame tests, not a new real-headset collision test. The exact-version official catalog covers 116 plugins: 1 works (Notebook default flow only), 45 partial, 59 broken and 11 not applicable. A read-only Steam bridge returned the Frame country, install folders and system information; IsThereAnyDeal selected that country in local Chromium, but its deployed HTTP endpoint and deal lookup remain unverified. An isolated ARM64 LocalSend core answered its info endpoint, but the official x86-only plugin archive and file transfers remain blocked. Three official audio plugins had local real-backend controls and independent virtual-audio readbacks, but their ARM64 Frame audio sessions and physical output remain unverified. Most official backends and VR controls remain unverified. Physical controller use and wearer-visible official panels remain unverified | 26 Oct, v0.4.31–0.4.39: [managed store PR #208](https://github.com/saphid/frame-control/pull/208), [name-collision PR #269](https://github.com/saphid/frame-control/pull/269), [catalog PR #266](https://github.com/saphid/frame-control/pull/266), [backend event evidence](evidence/framey-events-backend-2026-10-26.json), [Steam read PR #274](https://github.com/saphid/frame-control/pull/274), [LocalSend evidence PR #275](https://github.com/saphid/frame-control/pull/275), [local audio evidence](evidence/framey-audio-backends-2026-10-26.md), [compatibility table](framey-compatibility.md) |
+| Experimental Framey VR plugin panels and store | Unattended Frame OS 0.5.6 runs showed the Framey sample panel in stereo compositor and mirror captures. The latest standby-gated exercise restored the original power settings and released its shared lock. Synthetic OpenVR clicks changed a live sample setting, read its Decky backend file and confirmed it after a fresh iframe reopen | No | This was the repository sample, not an official store plugin. Physical controllers, native scrolling, VR keyboard, wearer comfort and legibility remain unverified. CSS Loader and SteamGridDB exact archives passed fake Frame install/remove and panel packing; this does not establish theme or artwork controls in VR. Panel-local backend events and React toasts have local/real-backend checks, but no wearer review. Pause Games and Tailscale Control settings render in local Chromium; their live actions are unverified. The 116-plugin catalog had 60 fake installs/removals and 56 expected blocks; 98 local Chromium initializers were ready and 18 failed. Notebook is marked works only for its default drawing/save/reopen flow | 26 Oct, v0.4.38–0.4.39: [latest unworn sample evidence](evidence/framey-vr-standby-gate-2026-10-26.md), [backend event PR #270](https://github.com/saphid/frame-control/pull/270), [settings/cache PR #271](https://github.com/saphid/frame-control/pull/271), [worn checklist](framey-vr-check.md) |
 
 Release notes must preserve these limits until a newer recorded check changes them. When a feature is retested, add its date, exact app/Frame version, host type and proof here. The older [v0.3.1 matrix](support-matrix.html) is a historical snapshot and does not describe current coverage.

docs/decky-frame.md

@@ -91,6 +91,11 @@ hash and archive paths, blocks root plugins and non-ARM64 binaries, and rolls
 back an update if the service restart fails. An update is also refused if its
 new plugin name is already used by another installed plugin, because Decky
 routes backend calls by name. This collision check has local tests only.
+For a managed plugin with a valid recorded SHA-256, Update and Remove recheck
+that installed receipt under the headset transaction lock. If another store
+action changed it after the list was read, refresh the installed list and
+review the action again. This race check has local transaction tests; older
+receipts without a valid hash still use the existing ownership check.
 The current VR shell does not provide Decky's Steam Deck Quick Access Menu.
 Frame Control's headset panel
 shows installed plugins and store actions. Its separate Framey iframe hosts

docs/evidence/framey-vr-standby-gate-2026-10-26.json

@@ -0,0 +1,120 @@
+{
+  "timeUtc": "2026-10-26T01:52:44.513151+00:00",
+  "testedMainCommit": "c62bffc8efe88e107a82e2f2ef481228021acc88",
+  "change": "uncommitted standby/proximity preflight in this PR",
+  "preflight": {
+    "activity": 3,
+    "proximityRaw": [
+      6.3125
+    ],
+    "batteryPercent": [
+      99
+    ],
+    "pause": "power.pauseCompositorOnStandby=false",
+    "screenTimeout": "power.turnOffScreensTimeout=5.000000"
+  },
+  "result": {
+    "passed": true,
+    "overlayVisible": true,
+    "stereoChanged": true,
+    "mirrorCaptured": true,
+    "trustedSyntheticOpenVRPointer": true,
+    "liveDeckySavedSetting": {
+      "enabled": true
+    },
+    "settingPersistedAfterReopen": true,
+    "quickActionObserved": true,
+    "sliderValue": "50",
+    "textValue": "framey-ci",
+    "nativeScrollMoved": false
+  },
+  "cleanup": {
+    "batteryPercent": [
+      99
+    ],
+    "proximityRaw": [
+      6.1875
+    ],
+    "pause": "power.pauseCompositorOnStandby=false",
+    "screenTimeout": "power.turnOffScreensTimeout=5.000000",
+    "powerRecoveryRemoved": true,
+    "lockReleased": true,
+    "errors": []
+  },
+  "limits": {
+    "controllerHardwareVerified": false,
+    "wornVisualComfortVerified": false,
+    "vrKeyboardVerified": false
+  },
+  "combinedHeadChecks": [
+    {
+      "timeUtc": "2026-10-26T02:01:05.938830+00:00",
+      "head": "bc72c41be5aa4bc80192145afefb1c6fe31a47fc",
+      "passed": false,
+      "overlayVisible": false,
+      "inputPassed": false,
+      "reason": "Timed out waiting for live UI: 0",
+      "retaggedTestWindow": true,
+      "batteryBefore": [
+        100
+      ],
+      "batteryAfter": [
+        99
+      ],
+      "powerRestored": true,
+      "lockReleased": true
+    },
+    {
+      "timeUtc": "2026-10-26T02:02:44.600755+00:00",
+      "head": "bc72c41be5aa4bc80192145afefb1c6fe31a47fc",
+      "passed": false,
+      "overlayVisible": false,
+      "inputPassed": false,
+      "reason": "Timed out waiting for live UI: 0",
+      "retaggedTestWindow": true,
+      "batteryBefore": [
+        99
+      ],
+      "batteryAfter": [
+        99
+      ],
+      "powerRestored": true,
+      "lockReleased": true
+    },
+    {
+      "timeUtc": "2026-10-26T02:05:00.560460+00:00",
+      "head": "bc72c41be5aa4bc80192145afefb1c6fe31a47fc",
+      "passed": true,
+      "overlayVisible": true,
+      "inputPassed": true,
+      "reason": null,
+      "retaggedTestWindow": false,
+      "batteryBefore": [
+        99
+      ],
+      "batteryAfter": [
+        99
+      ],
+      "powerRestored": true,
+      "lockReleased": true
+    },
+    {
+      "timeUtc": "2026-10-26T02:07:28.654641+00:00",
+      "head": "db079eec9f64a865fca8a1a51b5304e071596383",
+      "localChange": "bounded overlay wait on this PR branch",
+      "passed": true,
+      "overlayVisible": true,
+      "inputPassed": true,
+      "reason": null,
+      "retaggedTestWindow": false,
+      "batteryBefore": [
+        100
+      ],
+      "batteryAfter": [
+        99
+      ],
+      "powerRestored": true,
+      "lockReleased": true
+    }
+  ]
+}

docs/evidence/framey-vr-standby-gate-2026-10-26.md

@@ -0,0 +1,50 @@
+# Framey unworn exercise with standby gate
+
+At 2026-10-26 01:52 UTC, this PR's `scripts/framey-vr-check.py --exercise`
+acquired the shared lock on a real Frame running the `c62bffc8` main bundle.
+The new read-only preflight found SteamVR activity 3 (standby), proximity raw
+6.3125 and battery 99% before allowing temporary installation or power changes.
+The lock owner was unique to this run.
+
+The documented unworn exercise passed: the Frame Control overlay was visible,
+stereo compositor pixels changed, `/dev/video99` was captured, a synthetic
+trusted OpenVR pointer reached the sample, a live Decky setting was saved and
+persisted after a fresh panel reopen, and the quick action, slider and text
+field produced their expected values. Native scroll did not move. The test
+retagged only its temporary panel window once to recover focus. Public numeric
+results are in [framey-vr-standby-gate-2026-10-26.json](framey-vr-standby-gate-2026-10-26.json).
+Room-containing stereo and mirror captures remain private in `/tmp`.
+
+Cleanup returned battery 99%, `power.pauseCompositorOnStandby=false` and
+`power.turnOffScreensTimeout=5.000000`, matching the preflight. The temporary
+power recovery unit was removed, no cleanup errors were reported, and only
+this run's lock was released. Local tests also checked that activity 1, 2 or
+unknown refuses both `--wake` and `--exercise` before any installation or
+power change.
+
+Synthetic pointer events and captures do not prove physical controller use,
+wearer-visible readability, optical comfort or VR keyboard behavior. Those
+remain unverified.
+
+## Combined v0.4.39 candidate reruns
+
+After #278 and #279 joined main, the combined `bc72c41` branch ran the same
+locked exercise three times. The first two runs (02:01 and 02:02 UTC) loaded
+the sample UI in Chromium, but SteamVR kept its overlay hidden even after the
+existing test-window focus retry. Synthetic input reached no panel control;
+both runs failed. The third run (02:05 UTC) showed the overlay without that
+retry and passed the sample setting, input, stereo and mirror checks. Every run
+restored the original power settings, removed its recovery timer and released
+its own lock with no cleanup errors. The [numeric summary](framey-vr-standby-gate-2026-10-26.json)
+records all three outcomes.
+
+The intermittent hidden-overlay condition remains a reliability limit. The
+runner now records a small read-only diagnostic and refuses to send synthetic
+input if the overlay stays hidden after its focus retry. A successful Chromium
+panel alone is not treated as VR visibility.
+
+At 02:07 UTC, a fourth combined-head run with a bounded overlay wait passed
+without a focus retry. The sample setting/input and stereo checks passed; power
+settings were restored, the recovery timer was removed, and the owned lock was
+released. This single pass does not prove that the wait eliminates intermittent
+hidden overlays. Battery changed from 100% to 99% during the run.

docs/evidence/v0438-release-smoke-2026-10-26.json

@@ -0,0 +1,32 @@
+{
+  "tag": "v0.4.38",
+  "commit": "d87b863aa3c61c9833045b29ba79c7534a351ef4",
+  "startedUtc": "2026-10-26T01:47:23Z",
+  "frameOSVersion": "0.5.6",
+  "frameOSBuild": "20261022.6153909",
+  "preflight": {
+    "steamVRActivity": 3,
+    "proximityRaw": 6.3125,
+    "batteryPercent": 100
+  },
+  "postflight": {
+    "steamVRActivity": 3,
+    "proximityRaw": 6.25,
+    "batteryPercent": 100
+  },
+  "smoke": {
+    "passed": 13,
+    "failed": 0,
+    "arm64": "running",
+    "x86_64": "runtime missing",
+    "windowsExe": "running",
+    "finalCleanupPassed": true,
+    "ownedProcessesAfterCleanup": 0
+  },
+  "sharedLock": "unique owner released",
+  "limits": [
+    "No worn headset",
+    "No physical controller input",
+    "No official Decky panel tested in this smoke"
+  ]
+}

docs/evidence/v0438-release-smoke-2026-10-26.md

@@ -0,0 +1,27 @@
+# v0.4.38 real Frame release smoke
+
+On 2026-10-26 at 01:47 UTC, the exact `v0.4.38` tag
+`d87b863aa3c61c9833045b29ba79c7534a351ef4` passed `scripts/frame-smoke.sh`
+on a real Frame running SteamOS 0.5.6 build `20261022.6153909`. The wrapper
+atomically acquired `/tmp/frame-test.lock` with a unique owner, then read
+SteamVR activity 3 (standby), proximity raw 6.3125 and battery 100%. It ran
+the smoke only after that preflight.
+
+All 13 smoke steps passed. The ARM64 test title ran. The x86_64 title correctly
+reported its runtime missing. The Windows executable ran through the ARM64
+Proton path. The final cleanup found no test processes and removed the reserved
+smoke titles. The read-only postflight still found activity 3 and battery 100%;
+the wrapper released only its own lock. The public numeric summary is
+[v0438-release-smoke-2026-10-26.json](v0438-release-smoke-2026-10-26.json).
+Private raw logs and process paths remain in `/tmp` and were not published.
+
+The new built-in shared-lock preflight on this PR's branch separately passed
+the same 13/13 smoke steps at 01:46 UTC, with activity 3, proximity raw 6.3125
+and battery 100% before the run. The lock was released after cleanup. The local
+`tests.test_smoke_cleanup` suite passed 20 tests, including refusal on a busy
+lock and release after a failed preflight. The built-in preflight was **not**
+part of the v0.4.38 tag; that release used the external lock wrapper described
+above.
+
+These checks did not involve a worn headset or prove Framey panel visibility,
+physical controller interaction, or optical comfort.

docs/framey-vr-check.md

@@ -16,8 +16,10 @@ pixels. Review/redact them before committing or sharing. JSON reports have
 screenshot hashes and no UI access keys.
 
 The runner acquires `/tmp/frame-test.lock` by atomic `mkdir`, writes a random
-owner, then reads battery and SteamVR state. A foreign lock prevents sensor
-reads, wake, installation and input. Unknown battery or below 20% aborts.
+owner, then reads battery, proximity and SteamVR state. A foreign lock prevents
+sensor reads, wake, installation and input. Unknown battery or below 20% aborts.
+`--wake` and `--exercise` also require SteamVR activity 3 (standby); awake or
+unknown activity exits before power changes, service installation or input.
 Battery is read again before release. The default check never wakes or
 installs anything; it returns nonzero when the panel is absent/hidden.
 
@@ -58,9 +60,12 @@ CDP `Input.insertText` after OpenVR pointer focus. This is synthetic input,
 not proof of a physical controller or the SteamVR virtual keyboard.
 
 SteamVR can leave a recreated panel hidden with a stale focus request. The
-exercise retries once by removing and reapplying `STEAM_GAME` on its own test
+exercise waits briefly for the new overlay, then retries once by removing and
+reapplying `STEAM_GAME` on its own test
 browser window, then requests focus again. It never retags another application.
-The report records whether this recovery was needed. Registration, dashboard
+If the overlay stays hidden, it records a small read-only registration/service
+diagnostic and stops before synthetic input. The report records whether this
+recovery was needed. Registration, dashboard
 visibility, actual panel visibility, and pixel capture are separate checks.
 A visible docked panel can report `IsDashboardVisible=false` and
 `IsActiveDashboardOverlay=false`. A zero-sized main texture or failed image

docs/testing.md

@@ -208,6 +208,13 @@ It resolves the checkout path independently of the current working directory.
 `/path/to/checkout/scripts/frame-smoke.sh --help` is safe to run offline and
 does not contact the headset.
 
+Before reading headset status or changing titles, the smoke script atomically
+acquires the shared `/tmp/frame-test.lock` with a unique owner token. It reads
+SteamVR activity, proximity and battery while locked. An awake headset, unknown
+activity, battery below 20%, or a busy lock stops the run without installing
+anything. It releases only its own lock after cleanup. The JSON result includes
+the read-only preflight for completed smoke runs.
+
 It checks `properties.json` and the status, then installs, launches and
 removes three tiny titles built from bytes by `tests/smoke/tiny_programs.py`
 (an ARM64 and an x86-64 static Linux program that sleep for ten seconds, and

scripts/framey-vr-check.py

@@ -66,12 +66,16 @@ finally: lib.VR_ShutdownInternal()
 battery=[]
 for p in pathlib.Path('/sys/class/power_supply').glob('*/capacity'):
     if (p.parent/'type').read_text().strip()=='Battery': battery.append(int(p.read_text()))
+proximity=[]
+for p in pathlib.Path('/sys/bus/iio/devices').glob('iio:device*/in_proximity_raw'):
+    try: proximity.append(float(p.read_text().strip()))
+    except (OSError,ValueError): pass
 def cmd(*args):
     p=subprocess.run(args,capture_output=True,text=True,timeout=8)
     if p.returncode: raise RuntimeError(p.stderr or p.stdout)
     return p.stdout.strip()
 vr='/opt/steamvr/bin/linuxarm64/vrcmd'
-print(json.dumps({'battery':battery,'dashboardVisible':dashboard,'stats':json.loads(cmd(vr,'--stats')),
+print(json.dumps({'battery':battery,'proximity':proximity,'dashboardVisible':dashboard,'stats':json.loads(cmd(vr,'--stats')),
  'overlays':cmd(vr,'--overlays'),
  'pause':cmd(vr,'--settings-bool','power.pauseCompositorOnStandby'),
  'timeout':cmd(vr,'--settings-float','power.turnOffScreensTimeout')}))
@@ -95,6 +99,33 @@ finally: vr.close()
 '''
 
 
+def wait_overlay(remote, attempts=8):
+    """Give SteamVR a bounded moment to expose its newly registered panel."""
+    for attempt in range(attempts):
+        snapshot = remote.python(diagnostic_source())
+        if snapshot['state']['visible']:
+            return snapshot
+        if attempt < attempts - 1:
+            time.sleep(1)
+    return snapshot
+
+
+HIDDEN_OVERLAY_DIAGNOSTIC = '''
+import json,pathlib,subprocess
+key='valve.steam.desktopgame.2001947813'
+p=subprocess.run(['/opt/steamvr/bin/linuxarm64/vrcmd','--overlays'],
+                 capture_output=True,text=True,timeout=8)
+lines=[line.strip() for line in p.stdout.splitlines() if "'"+key+"'" in line]
+service=subprocess.run(['systemctl','--user','is-active','frame-control-headset.service'],
+                       capture_output=True,text=True,timeout=8)
+state=pathlib.Path.home()/'.local/share/frame-control/headset/state.json'
+try: window=json.loads(state.read_text()).get('window')
+except (OSError,ValueError): window=None
+print(json.dumps({'overlayLines':lines[:2], 'overlayCommandExit':p.returncode,
+                  'serviceActive':service.stdout.strip()=='active', 'windowRegistered':bool(window)}))
+'''
+
+
 def debug_bundle(original, profile):
     """Only the test-owned browser gets CDP and a disposable profile."""
     out = io.BytesIO()
@@ -151,6 +182,11 @@ def main(argv=None):
         pause, timeout = settings(before)
         if not before['battery'] or min(before['battery']) < 20:
             raise RuntimeError('Battery unknown or below 20%')
+        if args.wake or args.exercise:
+            stats = before.get('stats')
+            if (not isinstance(stats, list) or not stats or
+                    not isinstance(stats[0], dict) or stats[0].get('activity_level') != 3):
+                raise RuntimeError('Frame is awake or SteamVR activity is unknown; active session untouched')
         if args.wake or args.exercise:
             # Independent systemd timer restores power even if the controller is
             # killed or SSH disappears. It retains the test lock for recovery.
@@ -202,7 +238,7 @@ print(json.dumps({'created':True}))
             remote(VRCMD + ' --handlewakeup')
             remote(VRCMD + ' --showdashboard ' + KEY)
             time.sleep(2)
-        report['overlay'] = remote.python(diagnostic_source())
+        report['overlay'] = wait_overlay(remote) if args.wake or args.exercise else remote.python(diagnostic_source())
         if args.exercise and not report['overlay']['state']['visible']:
             report['retaggedTestWindow'] = True
             remote.python('''
@@ -217,7 +253,13 @@ subprocess.run(['/opt/steamvr/bin/linuxarm64/vrcmd','--showdashboard','valve.ste
 time.sleep(2)
 print('{}')
 ''')
-            report['overlay'] = remote.python(diagnostic_source())
+            report['overlay'] = wait_overlay(remote)
+        if args.exercise and not report['overlay']['state']['visible']:
+            try:
+                report['hiddenOverlay'] = remote.python(HIDDEN_OVERLAY_DIAGNOSTIC)
+            except Exception as exc:
+                report['hiddenOverlayError'] = str(exc)
+            raise RuntimeError('Frame Control overlay stayed hidden after focus retry; no input sent')
         if args.wake or args.exercise:
             shot = remote.python((ROOT/'ui/frame_vrshot.py').read_text(), timeout=20)['path']
             try:

tests/smoke/frame_smoke.py

@@ -4,6 +4,11 @@ Runs on your computer through the `frame` SSH alias (or FRAME_ALIAS), with
 Frame Control's own modules, and records what happened with the headset's
 BUILD_ID in tests/smoke/results/<time>-<BUILD_ID>.json (git-ignored):
 
+Before any status read or title change, it atomically owns /tmp/frame-test.lock
+on the Frame and checks SteamVR standby, proximity and battery read-only. A
+busy lock, awake headset or battery below 20% stops the run. Only this run's
+lock is released, including after test failures.
+
 - properties.json from Valve's devkit service names the login user;
 - status (ui/frame_status.py) reads the build, battery and storage;
 - three tiny titles (tests/smoke/tiny_programs.py: ARM64 and x86-64 static
@@ -28,6 +33,7 @@ import argparse
 import json
 import os
 import platform
+import secrets
 import shlex
 import subprocess
 import sys
@@ -50,6 +56,60 @@ import stop_processes  # noqa: E402
 
 RESULTS = Path(os.environ.get('FRAME_SMOKE_RESULTS') or HERE / 'results')
 PREFIX = 'fc_smoke_'
+LOCK = '/tmp/frame-test.lock'
+
+
+def remote(command, *, input=None):
+    """Use a bounded SSH call for shared-lock operations."""
+    return subprocess.run(['ssh', '-o', 'BatchMode=yes', '-o', 'ConnectTimeout=8', ALIAS, command],
+                          input=input, capture_output=True, text=True, timeout=20)
+
+
+def acquire_lock(token):
+    """Atomically reserve the Frame before reading its state or changing titles."""
+    command = (f'mkdir {LOCK} && {{ printf %s {shlex.quote(token)} > {LOCK}/owner || '
+               f'{{ rmdir {LOCK}; exit 1; }}; }}')
+    return remote(command).returncode == 0
+
+
+def release_lock(token):
+    """Never remove a lock if its owner changed."""
+    command = (f'test "$(cat {LOCK}/owner)" = {shlex.quote(token)} && '
+               f'rm {LOCK}/owner && rmdir {LOCK}')
+    return remote(command).returncode == 0
+
+
+PREFLIGHT = r'''
+import json, pathlib, subprocess
+r = subprocess.run(['/opt/steamvr/bin/linuxarm64/vrcmd', '--stats'],
+                   capture_output=True, text=True, timeout=8)
+try: activity = json.loads(r.stdout)[0]['activity_level'] if r.returncode == 0 else None
+except (ValueError, KeyError, IndexError, TypeError): activity = None
+proximity = []
+for path in pathlib.Path('/sys/bus/iio/devices').glob('iio:device*/in_proximity_raw'):
+    try: proximity.append(float(path.read_text().strip()))
+    except (OSError, ValueError): pass
+battery = []
+for path in pathlib.Path('/sys/class/power_supply').glob('*/capacity'):
+    try:
+        if (path.parent/'type').read_text().strip() == 'Battery':
+            battery.append(int(path.read_text().strip()))
+    except (OSError, ValueError): pass
+print(json.dumps({'activity': activity, 'proximity': proximity, 'battery': battery}))
+'''
+
+
+def preflight():
+    result = remote('python3 -', input=PREFLIGHT)
+    if result.returncode:
+        raise RuntimeError('Locked SteamVR and battery preflight failed: ' + result.stderr.strip())
+    state = json.loads(result.stdout)
+    if state.get('activity') != 3:
+        raise RuntimeError('Frame is awake or SteamVR activity is unknown; active session untouched')
+    battery = state.get('battery')
+    if not battery or min(battery) < 20:
+        raise RuntimeError('Frame battery is unavailable or below the smoke threshold')
+    return state
 
 
 def stop_titles(ids):
@@ -308,17 +368,8 @@ def pair(folder):
         print(f'    removed the smoke key from authorized_keys ({dropped} line(s))', flush=True)
 
 
-def main():
-    ap = argparse.ArgumentParser(description=__doc__.splitlines()[0])
-    ap.add_argument('--pair', action='store_true', help='also pair through the devkit service (needs you in the headset)')
-    args = ap.parse_args()
-
-    r = subprocess.run(['ssh', '-o', 'ConnectTimeout=5', '-o', 'BatchMode=yes', ALIAS, 'true'],
-                       capture_output=True, text=True)
-    if r.returncode != 0:
-        print(f'{ALIAS} is not reachable over SSH: {r.stderr.strip()}', file=sys.stderr)
-        return 2
-
+def run_smoke(args, before):
+    """Run only after the shared lock and read-only preflight succeeded."""
     smoke = Smoke()
     started = time.strftime('%Y-%m-%dT%H:%M:%SZ', time.gmtime())
     release = os_release()
@@ -347,12 +398,45 @@ def main():
     passed = sum(s['ok'] for s in smoke.steps)
     RESULTS.mkdir(exist_ok=True)
     out = RESULTS / f"{started.replace(':', '')}-{build}.json"
-    out.write_text(json.dumps({'started': started, 'alias': ALIAS, 'os_release': release, 'paired': args.pair,
+    out.write_text(json.dumps({'started': started, 'alias': ALIAS, 'preflight': before,
+                               'os_release': release, 'paired': args.pair,
                                'passed': passed, 'failed': len(smoke.steps) - passed,
                                'devkit_utils_there_before': had_utils, 'steps': smoke.steps}, indent=1))
     print(f'==> {passed}/{len(smoke.steps)} steps passed on build {build}; results in {out}')
     return 0 if passed == len(smoke.steps) else 1
 
 
+def main():
+    ap = argparse.ArgumentParser(description=__doc__.splitlines()[0])
+    ap.add_argument('--pair', action='store_true', help='also pair through the devkit service (needs you in the headset)')
+    args = ap.parse_args()
+    token = 'frame-smoke-' + secrets.token_hex(10)
+    try:
+        locked = acquire_lock(token)
+    except (OSError, subprocess.TimeoutExpired):
+        locked = False
+    if not locked:
+        print('Shared Frame lock busy or unreachable; no headset status read or smoke run.', file=sys.stderr)
+        return 2
+    result = 1
+    try:
+        try:
+            before = preflight()
+            print('Locked read-only preflight: ' + json.dumps(before), flush=True)
+            result = run_smoke(args, before)
+        except (OSError, ValueError, RuntimeError, subprocess.TimeoutExpired) as failure:
+            print(str(failure), file=sys.stderr)
+            result = 2
+    finally:
+        try:
+            released = release_lock(token)
+        except (OSError, subprocess.TimeoutExpired):
+            released = False
+        if not released:
+            print('ERROR: could not release owned Frame lock.', file=sys.stderr)
+            result = 1
+    return result
+
+
 if __name__ == '__main__':
     sys.exit(main())

tests/test_frame_decky_store.py

@@ -98,14 +98,14 @@ class StoreTransaction(unittest.TestCase):
         self.folder = home / '.local/share/frame-control/decky/plugins/Example'
         self.folder.parent.mkdir(parents=True)
 
-    def apply(self, action, data=None):
+    def apply(self, action, data=None, expected='-'):
         token = secrets.token_hex(12)
         source = Path('/tmp/frame-control-decky-plugin-' + token)
         if data is not None:
             source.write_bytes(data)
         digest = hashlib.sha256(data or b'').hexdigest()
         try:
-            return subprocess.run([sys.executable, '-', action, token, '42', digest, 'Example', '1.0'],
+            return subprocess.run([sys.executable, '-', action, token, '42', digest, 'Example', '1.0', expected],
                                   input=frame_decky_store.APPLY, text=True, capture_output=True,
                                   env=self.env, timeout=15)
         finally:
@@ -202,6 +202,29 @@ class StoreTransaction(unittest.TestCase):
         self.assertTrue(self.folder.exists())
         self.assertEqual(list(self.folder.parent.glob('.frame-control-stage-*')), [])
 
+    def test_update_and_remove_reject_stale_installed_receipt(self):
+        first, first_hash = archive()
+        second, _ = archive(extra=('Example/data.txt', 'new'))
+        self.assertEqual(self.apply('install', first).returncode, 0)
+        marker = self.folder / '.frame-control-store.json'
+        self.assertEqual(json.loads(marker.read_text())['sha256'], first_hash)
+
+        # A newer store operation wins before the caller reaches the lock.
+        current = json.loads(marker.read_text())
+        current['sha256'] = 'b' * 64
+        marker.write_text(json.dumps(current))
+        for action, data in [('update', second), ('remove', None)]:
+            with self.subTest(action=action):
+                result = self.apply(action, data, expected=first_hash)
+                self.assertNotEqual(result.returncode, 0)
+                self.assertIn('Installed plugin changed', result.stderr)
+                self.assertTrue(self.folder.exists())
+                self.assertEqual(json.loads(marker.read_text())['sha256'], 'b' * 64)
+        self.assertEqual(list(self.folder.parent.glob('.frame-control-stage-*')), [])
+        self.assertEqual(list(self.folder.parent.glob('.frame-control-old-*')), [])
+        self.assertEqual(self.apply('remove', expected='b' * 64).returncode, 0)
+        self.assertFalse(self.folder.exists())
+
 
 class StoreHost(unittest.TestCase):
     def test_reviewed_archive_changed_before_install_does_not_download(self):
@@ -218,7 +241,8 @@ class StoreHost(unittest.TestCase):
 
     def test_stopped_managed_service_allows_removing_owned_plugin(self):
         state = {'managed': True, 'running': False, 'plugins':
-                 [{'storeId': 42, 'folder': 'Example', 'name': 'Example', 'version': '1.0'}]}
+                 [{'storeId': 42, 'folder': 'Example', 'name': 'Example', 'version': '1.0',
+                   'sha256': 'a' * 64}]}
         calls = []
         with patch.object(frame_decky_store.frame_decky, 'status', return_value=state), \
              patch.object(frame_decky_store, 'catalog') as network:
@@ -226,6 +250,7 @@ class StoreHost(unittest.TestCase):
                                                'remove', 42)
         self.assertEqual(result, {})
         self.assertEqual(len(calls), 1)
+        self.assertTrue(calls[0].endswith(' ' + 'a' * 64))
         network.assert_not_called()
 
     def test_renamed_store_plugin_cannot_be_installed_twice(self):
@@ -257,7 +282,8 @@ class StoreHost(unittest.TestCase):
     def test_update_allows_its_own_existing_name(self):
         data, digest = archive()
         state = {'managed': True, 'running': True, 'plugins': [
-            {'storeId': 42, 'folder': 'Example', 'name': 'Example', 'version': '1.0'}]}
+            {'storeId': 42, 'folder': 'Example', 'name': 'Example', 'version': '1.0',
+             'sha256': 'a' * 64}]}
         catalog = [{'id': 42, 'name': 'Example', 'root': False,
                     'sha256': digest, 'version': '2.0'}]
         calls = []
@@ -269,6 +295,7 @@ class StoreHost(unittest.TestCase):
         self.assertEqual(result, {})
         self.assertEqual(len(calls), 3)  # Upload, apply, and temporary archive cleanup.
         self.assertIn('update', calls[1])
+        self.assertTrue(calls[1].endswith(' ' + 'a' * 64))
 
     def test_owned_plugin_can_be_removed_without_store_network(self):
         state = {'managed': True, 'running': True, 'plugins':

tests/test_framey_vr_check.py

@@ -15,6 +15,24 @@ spec.loader.exec_module(check)
 
 
 class Safety(unittest.TestCase):
+    def test_overlay_wait_is_bounded_and_stops_when_visible(self):
+        from unittest.mock import Mock
+        remote = Mock()
+        remote.python.side_effect = [{'state':{'visible':False}},
+                                     {'state':{'visible':False}},
+                                     {'state':{'visible':True}}]
+        with patch.object(check.time, 'sleep') as sleep:
+            self.assertTrue(check.wait_overlay(remote)['state']['visible'])
+        self.assertEqual(remote.python.call_count, 3)
+        self.assertEqual(sleep.call_count, 2)
+
+        remote.python.reset_mock(side_effect=True)
+        remote.python.return_value = {'state':{'visible':False}}
+        with patch.object(check.time, 'sleep') as sleep:
+            self.assertFalse(check.wait_overlay(remote, attempts=3)['state']['visible'])
+        self.assertEqual(remote.python.call_count, 3)
+        self.assertEqual(sleep.call_count, 2)
+
     def test_foreign_lock_prevents_sensor_reads_and_cleanup(self):
         with tempfile.TemporaryDirectory() as folder, patch.object(check, 'Remote') as factory:
             remote = factory.return_value
@@ -42,7 +60,8 @@ class Safety(unittest.TestCase):
 
     def test_power_restore_after_partial_setter_failure(self):
         state = {'battery':[99], 'pause':'power.pauseCompositorOnStandby=true',
-                 'timeout':'power.turnOffScreensTimeout=17.000000','dashboardVisible':False}
+                 'timeout':'power.turnOffScreensTimeout=17.000000','dashboardVisible':False,
+                 'stats':[{'activity_level':3}], 'proximity':[6.25]}
         with tempfile.TemporaryDirectory() as folder, patch.object(check, 'Remote') as factory:
             remote = factory.return_value
             remote.python.return_value = state
@@ -58,6 +77,28 @@ class Safety(unittest.TestCase):
             self.assertTrue(any('--set-settings-float power.turnOffScreensTimeout 17.000000' in c for c in commands))
             self.assertIn('rmdir /tmp/frame-test.lock', commands[-1])
 
+    def test_awake_or_unknown_activity_refuses_wake_and_install(self):
+        for stats in ([{'activity_level':1}], [{'activity_level':2}], [], None):
+            state = {'battery':[99], 'pause':'power.pauseCompositorOnStandby=true',
+                     'timeout':'power.turnOffScreensTimeout=17.000000',
+                     'dashboardVisible':False, 'stats':stats, 'proximity':[0.0]}
+            for mode in ('--wake', '--exercise'):
+                with self.subTest(stats=stats, mode=mode), \
+                     tempfile.TemporaryDirectory() as folder, \
+                     patch.object(check, 'Remote') as factory, \
+                     patch.object(check.frame_decky, 'change') as install:
+                    remote = factory.return_value
+                    remote.python.return_value = state
+                    with contextlib.redirect_stdout(io.StringIO()):
+                        self.assertEqual(check.main([mode,'--output',folder]), 1)
+                    install.assert_not_called()
+                    commands = [c.args[0] for c in remote.call_args_list]
+                    self.assertEqual(len(commands), 2)
+                    self.assertIn('mkdir /tmp/frame-test.lock', commands[0])
+                    self.assertIn('rmdir /tmp/frame-test.lock', commands[-1])
+                    report = json.loads((Path(folder)/'result.json').read_text())
+                    self.assertIn('active session untouched', report['error'])
+
     def test_exact_linux_event_abi_and_debug_profile(self):
         import ctypes
         overlay_spec = importlib.util.spec_from_file_location('framey_openvr', PATH.with_name('framey_openvr.py'))

tests/test_smoke_cleanup.py

@@ -1,5 +1,6 @@
 """Smoke cleanup against real local Linux processes, never a headset or SSH."""
 import sandbox  # noqa: F401
+import json
 import os
 from pathlib import Path
 import shutil
@@ -139,11 +140,61 @@ class Safety(unittest.TestCase):
                 mock.patch.object(frame_smoke, 'cleanup', side_effect=RuntimeError('cannot stop')), \
                 mock.patch.object(frame_smoke, 'title_cycle') as cycle, \
                 mock.patch('builtins.print'):
-            self.assertEqual(frame_smoke.main(), 1)
+            self.assertEqual(frame_smoke.run_smoke(mock.Mock(pair=False),
+                             {'activity':3,'proximity':[],'battery':[100]}), 1)
             cycle.assert_not_called()
             self.assertEqual(len(list(Path(folder).glob('*-fake.json'))), 1)
 
 
+class SharedSmokeLock(unittest.TestCase):
+    def test_busy_lock_prevents_any_status_read_or_title_change(self):
+        with mock.patch.object(frame_smoke.sys, 'argv', ['frame_smoke.py']), \
+             mock.patch.object(frame_smoke, 'acquire_lock', return_value=False), \
+             mock.patch.object(frame_smoke, 'preflight') as preflight, \
+             mock.patch.object(frame_smoke, 'run_smoke') as run, \
+             mock.patch.object(frame_smoke, 'release_lock') as release:
+            self.assertEqual(frame_smoke.main(), 2)
+            preflight.assert_not_called()
+            run.assert_not_called()
+            release.assert_not_called()
+
+    def test_preflight_requires_standby_and_sufficient_battery(self):
+        for state in ({'activity':1,'proximity':[1],'battery':[100]},
+                      {'activity':None,'proximity':[],'battery':[100]},
+                      {'activity':3,'proximity':[],'battery':[19]},
+                      {'activity':3,'proximity':[],'battery':[]}):
+            with self.subTest(state=state), mock.patch.object(frame_smoke, 'remote',
+                    return_value=mock.Mock(returncode=0, stdout=json.dumps(state))):
+                with self.assertRaises(RuntimeError):
+                    frame_smoke.preflight()
+        with mock.patch.object(frame_smoke, 'remote', return_value=mock.Mock(
+                returncode=0, stdout=json.dumps({'activity':3,'proximity':[0],'battery':[99]}))):
+            self.assertEqual(frame_smoke.preflight()['battery'], [99])
+
+    def test_owner_checked_on_release_and_preflight_failure_still_releases(self):
+        commands = []
+        def remote(command, **_):
+            commands.append(command)
+            return mock.Mock(returncode=0)
+        with mock.patch.object(frame_smoke, 'remote', side_effect=remote):
+            self.assertTrue(frame_smoke.acquire_lock('frame-smoke-test-token'))
+            self.assertTrue(frame_smoke.release_lock('frame-smoke-test-token'))
+        self.assertIn('mkdir /tmp/frame-test.lock', commands[0])
+        self.assertIn('> /tmp/frame-test.lock/owner', commands[0])
+        self.assertIn('test "$(cat /tmp/frame-test.lock/owner)" = frame-smoke-test-token', commands[1])
+        self.assertLess(commands[1].index('test '), commands[1].index('rm /tmp/frame-test.lock/owner'))
+
+        with mock.patch.object(frame_smoke.sys, 'argv', ['frame_smoke.py']), \
+             mock.patch.object(frame_smoke, 'acquire_lock', return_value=True), \
+             mock.patch.object(frame_smoke, 'preflight', side_effect=RuntimeError('awake')), \
+             mock.patch.object(frame_smoke, 'run_smoke') as run, \
+             mock.patch.object(frame_smoke, 'release_lock', return_value=True) as release:
+            self.assertEqual(frame_smoke.main(), 2)
+            run.assert_not_called()
+            release.assert_called_once()
+            self.assertTrue(release.call_args.args[0].startswith('frame-smoke-'))
+
+
 @unittest.skipUnless(os.name == 'posix', 'local POSIX shell required')
 class OrphanCleanup(unittest.TestCase):
     """Run the real cleanup shell commands in a throwaway home; mock Steam/SSH."""

ui/frame_decky_store.py

@@ -123,7 +123,7 @@ def archive_info(data, expected_hash, expected_name):
 
 APPLY = r'''
 import fcntl,hashlib,json,os,pathlib,shutil,subprocess,sys,zipfile
-action,token,plugin_id,digest,folder,version = sys.argv[1:]
+action,token,plugin_id,digest,folder,version,expected_installed = sys.argv[1:]
 base=pathlib.Path.home()/'.local/share/frame-control/decky/plugins'
 unit=pathlib.Path.home()/'.config/systemd/user/frame-control-decky.service'
 target=base/folder
@@ -151,6 +151,10 @@ try:
     if action not in ('install','update','remove'): raise RuntimeError('Invalid plugin action')
     if action=='install' and (target.exists() or target.is_symlink()): raise RuntimeError('Plugin folder already exists')
     if action in ('update','remove') and not owned(): raise RuntimeError('Only a Frame Control store plugin can be changed')
+    if action in ('update','remove') and expected_installed!='-':
+        current=json.loads((target/marker).read_text()).get('sha256')
+        if current!=expected_installed:
+            raise RuntimeError('Installed plugin changed; refresh the installed list and try again')
     running=subprocess.run(['systemctl','--user','is-active','--quiet','frame-control-decky.service']).returncode==0
     if action!='remove':
         data=archive.read_bytes()
@@ -261,6 +265,8 @@ def change(ssh, action, plugin_id, report=lambda stage, percent=None: None, revi
             raise ValueError('The store changed its plugin folder; remove the old version before installing')
     if not SAFE_FOLDER.fullmatch(folder):
         raise ValueError('Unsafe installed plugin folder')
+    previous = installed[0].get('sha256') if action != 'install' else None
+    expected_installed = previous if isinstance(previous, str) and SHA.fullmatch(previous) else '-'
     token = secrets.token_hex(12)
     remote = '/tmp/frame-control-decky-plugin-' + token
     try:
@@ -268,7 +274,7 @@ def change(ssh, action, plugin_id, report=lambda stage, percent=None: None, revi
             report('Sending archive to Frame', 65)
             ssh('umask 077; cat > ' + remote, stdin=data, text=False, timeout=120)
         report({'install':'Installing', 'update':'Updating', 'remove':'Removing'}[action] + ' plugin on Frame', 80)
-        return json.loads(ssh(f'python3 - {action} {token} {plugin_id} {plugin["sha256"]} {folder} {plugin["version"]}',
+        return json.loads(ssh(f'python3 - {action} {token} {plugin_id} {plugin["sha256"]} {folder} {plugin["version"]} {expected_installed}',
                               stdin=APPLY, timeout=90))
     finally:
         if data is not None: