Merge pull request 'Add GPL-3.0 licensing and prepare for a public repository' (#4 ) from public-repo-prep into main

Reviewed-on: #4 Reviewed-by: branderson <brad@branderson.io>
Add GPL-3.0 licensing and prepare for a public repository
2026-10-16 14:55:39 -07:00 · 2026-10-13 20:54:23 -07:00 · 2026-10-07 23:52:28 -07:00 · 2026-10-07 23:29:08 -07:00 · 2026-10-07 23:19:28 -07:00 · 2026-10-07 23:10:02 -07:00
36 changed files with 1580 additions and 27 deletions
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
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+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
@@ -63,8 +63,13 @@ them at that cost.
 ```

 Then right-click a panel or the desktop, Add Widgets, and search for
-"Insta360". Pass `--restart` when reinstalling over a running copy, since
-Plasma otherwise keeps the old one loaded.
+"Insta360".
+
+**Reinstalling needs `--restart`.** Plasma loads an applet's QML once and keeps
+it. Pulling new code and restarting the desktop is not enough on its own,
+because the installed copy is only replaced by `install.sh`. After updating
+this repo, run `./plasmoid/install.sh --restart`, or new behaviour will appear
+to be missing while the old code carries on running.

 The joystick is a velocity control: how far you push sets how fast the camera
 moves, and it stops when you let go. Degrees per step, step interval, deadzone
@@ -165,6 +170,8 @@ case where the gimbal is parked facing down.
 lua tests/test_obs_linkctl.lua          # pure helpers: quoting, parsing, commands
 lua tests/test_obs_lifecycle.lua        # the OBS script against a mock OBS API
 node tests/test_joystick_logic.js       # widget command building, parsing, key vectors
+tests/test_resolver.sh                  # binary resolution, run in a real shell
+python3 tests/lint_qml.py               # QML scope errors, with KDE types resolved
 python3 tests/test_gamepad.py           # gamepad event decoding and deadzone maths
 tests/test_gamepad_loop.sh              # the gamepad read loop, fed through a FIFO
 bin/linkctl-macro --print tracking on   # show the command without running it
@@ -178,6 +185,20 @@ The lifecycle suite drives the script the way OBS does, so it catches broken
 wiring (hotkeys not firing, scene actions not matching, the preset name being
 captured too early) without needing OBS or a camera.

+`tests/lint_qml.py` is worth understanding before trusting a clean QML run.
+Plain `qmllint` cannot resolve the KDE QML modules, so it reports every
+identifier inside `PlasmoidItem` as "Unqualified access" and buries real
+findings in roughly ninety lines of noise. `tests/qmlstubs/` holds minimal
+stand-ins for those modules so the types resolve and the scope analysis means
+something; with them in place the only legitimate unqualified accesses are a
+short allowlist, so anything else is a real finding. This exists because
+filtering that noise wholesale once hid a `ReferenceError: stick is not
+defined` that disabled all camera movement.
+
+If you add a configuration key to `contents/config/main.xml`, add it to
+`tests/qmlstubs/org/kde/plasma/plasmoid/Configuration.qml` too, or the linter
+will not catch a typo in the key name.
+
 `test_gamepad_loop.sh` substitutes a FIFO for `/dev/input/js*` and plays
 scripted events through it, so the select/read/decode/tick path is covered
 without a controller attached. It is also the test that pins down the
@@ -198,6 +219,27 @@ Versions of this repo before that fix wrote the Plasma 5 form.
 that works but the key does not, check for a conflict in System Settings, and
 confirm `--list` shows the entry as `present`.

+**The widget cannot control the camera, but `linkctl` works in a terminal.**
+Almost always `PATH`. Plasma runs applet commands through
+`KProcess::setShellCommand`, which is `/bin/sh -c` inheriting plasmashell's
+environment, and that environment never sources `~/.bashrc` or a login
+profile. An install that puts `linkctl` on `PATH` from a shell rc file, which
+includes `mise` and `asdf` shims and `~/.local/bin` on some distributions, is
+therefore invisible to the widget. The widget now searches those locations
+itself at startup and says so in its status line if it finds nothing; the
+settings page accepts a full path to override it. Compare what the session
+sees with what your shell sees:
+
+```sh
+systemctl --user show-environment | grep '^PATH'
+command -v linkctl
+```
+
+**The widget worked, then stopped after a restart or a replug.** The Link's
+`/dev/videoN` number is not stable. If the Video device field in the widget's
+settings is set, clear it and let auto-detection run: a pinned node that has
+since moved makes every command fail.
+
 **Gamepad does nothing.** Check `bin/linkctl-gamepad --list` sees it. If the
 device is listed but nothing moves, run `--monitor` and push the stick: no
 events means a permissions or driver problem, events with unexpected axis
@@ -221,6 +263,29 @@ needs both axes set in one `VIDIOC_S_EXT_CTRLS` call. `linkctl` does this
 correctly; raw `v4l2-ctl` needs `--set-ctrl pan_absolute=0,tilt_absolute=0`
 as one argument.

+## Credits
+
+This is glue around other people's reverse engineering, and none of it would
+exist without them:
+
+- [`illegalstudio/linkctl`](https://github.com/illegalstudio/linkctl) (MIT)
+  does the actual camera control. Everything here shells out to it.
+- [`schlarpc/insta360-link-firmware-re`](https://github.com/schlarpc/insta360-link-firmware-re)
+  documents the camera's UVC extension-unit protocol and internal parameter
+  space from a firmware teardown. It is the reference for anything not already
+  exposed by `linkctl`.
+- [`vrwallace/Insta360-Link-1-and-2-Controller-for-Linux`](https://github.com/vrwallace/Insta360-Link-1-and-2-Controller-for-Linux)
+  established that the Link 2 rejects single-axis pan/tilt writes and needs
+  both axes in one `VIDIOC_S_EXT_CTRLS` call, which is the detail that makes
+  gimbal control work at all.
+
+## License
+
+GPL-3.0-or-later. See [LICENSE](LICENSE).
+
+`linkctl` itself is MIT and separately licensed; this project invokes it as a
+subprocess and does not include or link against it.
+
 ## Status

 The helpers, the shell scripts and the gamepad read loop are tested offline,
@@ -1,4 +1,7 @@
 #!/usr/bin/env python3
+# SPDX-FileCopyrightText: 2026 branderson
+# SPDX-License-Identifier: GPL-3.0-or-later
+
 """Drive an Insta360 Link gimbal from a game controller.

 Reads the kernel joystick device directly (``/dev/input/js*``) and issues
@@ -1,4 +1,7 @@
 #!/usr/bin/env bash
+# SPDX-FileCopyrightText: 2026 branderson
+# SPDX-License-Identifier: GPL-3.0-or-later
+
 #
 # linkctl-macro - run a linkctl command as a desktop macro.
 #
@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: 2026 branderson
+# SPDX-License-Identifier: GPL-3.0-or-later
+
 #  Run the gamepad bridge as a user service.
 #
 #  Install:
@@ -15,14 +18,14 @@

 [Unit]
 Description=Insta360 Link gamepad control
-Documentation=https://gitbox.example.com/insta360-link-tools
 After=graphical-session.target
 PartOf=graphical-session.target

 [Service]
 Type=simple
-# Absolute path required: systemd does not search PATH for ExecStart.
-ExecStart=%h/workspace/insta360-link-tools/bin/linkctl-gamepad --wait
+# EDIT THIS. systemd does not search PATH for ExecStart, so it needs the
+# absolute path to your checkout. %h expands to your home directory.
+ExecStart=%h/PATH/TO/CHECKOUT/bin/linkctl-gamepad --wait
 Restart=on-failure
 RestartSec=5
 # The joystick device and the camera are the only things it touches.
@@ -1,4 +1,7 @@
 #!/usr/bin/env bash
+# SPDX-FileCopyrightText: 2026 branderson
+# SPDX-License-Identifier: GPL-3.0-or-later
+
 #
 # install-shortcuts.sh - register global hotkeys for the Insta360 Link under
 # KDE Plasma.
@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: 2026 branderson
+# SPDX-License-Identifier: GPL-3.0-or-later
+
 # Example configuration for bin/linkctl-macro.
 # Copy to ~/.config/linkctl-macro.conf and uncomment what you need.
 # This file is sourced by bash, so it is shell syntax.
@@ -1,3 +1,6 @@
+-- SPDX-FileCopyrightText: 2026 branderson
+-- SPDX-License-Identifier: GPL-3.0-or-later
+
 --[[
 obs-linkctl.lua - Insta360 Link control inside OBS.

@@ -1,4 +1,7 @@
 #!/usr/bin/env bash
+# SPDX-FileCopyrightText: 2026 branderson
+# SPDX-License-Identifier: GPL-3.0-or-later
+
 #
 # install.sh - install the Insta360 Link Joystick applet into Plasma.
 #
@@ -43,6 +46,22 @@ else
    die "neither kpackagetool6 nor kpackagetool5 found; is this a KDE Plasma session?"
 fi

+# Qt caches compiled QML and JS on disk. Replacing the applet's files does not
+# invalidate that cache reliably, and a stale compiled logic.js missing a
+# newer helper function is enough to break bindings that reference it. Clearing
+# it costs only a slower first load.
+clear_qml_cache() {
+    local cleared=0 d
+    for d in "${XDG_CACHE_HOME:-$HOME/.cache}"/plasmashell/qmlcache \
+             "${XDG_CACHE_HOME:-$HOME/.cache}"/org.kde.plasmashell/qmlcache \
+             "${XDG_CACHE_HOME:-$HOME/.cache}"/qmlcache; do
+        if [[ -d $d ]]; then
+            rm -rf -- "$d" && echo "  cleared $d" && cleared=1
+        fi
+    done
+    (( cleared )) || echo "  no QML cache to clear"
+}
+
 restart_shell() {
    (( RESTART )) || return 0
    echo "Restarting plasmashell:"
@@ -73,6 +92,8 @@ install)
        echo "Installing:"
        "$KPT" --type Plasma/Applet --install "$PKG"
    fi
+    echo "Clearing the compiled QML cache:"
+    clear_qml_cache
    restart_shell
    echo
    echo "Done. Right-click a panel or the desktop, Add Widgets, search 'Insta360'."
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 branderson
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 import QtQuick
 import org.kde.plasma.configuration

@@ -1,4 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!-- SPDX-FileCopyrightText: 2026 branderson
+     SPDX-License-Identifier: GPL-3.0-or-later -->
+
 <kcfg xmlns="http://www.kde.org/standards/kcfg/1.0"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://www.kde.org/standards/kcfg/1.0
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 branderson
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 /*
 * A circular virtual joystick.
 *
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 branderson
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 import QtQuick
 import QtQuick.Controls as QQC2
 import org.kde.kirigami as Kirigami
@@ -16,6 +19,20 @@ Kirigami.FormLayout {
    property alias cfg_invertPan: invertPan.checked
    property alias cfg_invertTilt: invertTilt.checked

+    // Plasma also assigns a cfg_<name>Default for every key, plus a title,
+    // when it instantiates a config page. Without these declared it logs
+    // "does not have a property called cfg_<name>Default" for each one and
+    // the Defaults button has nothing to compare against.
+    property string cfg_linkctlPathDefault: "linkctl"
+    property string cfg_deviceDefault: ""
+    property string cfg_homePresetDefault: "home"
+    property int cfg_maxStepDefault: 6
+    property int cfg_tickIntervalDefault: 160
+    property int cfg_deadzoneDefault: 15
+    property bool cfg_invertPanDefault: false
+    property bool cfg_invertTiltDefault: false
+    property string title: ""
+
    QQC2.TextField {
        id: linkctlPath
        Kirigami.FormData.label: "linkctl binary:"
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 branderson
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 /*
 * Pure helpers for the joystick applet.
 *
@@ -23,6 +26,53 @@ function baseCmd(linkctl, device) {
    return c;
 }

+/*
+ * Make a command string unique by appending a shell comment.
+ *
+ * Plasma's executable data engine keys its containers by the command string.
+ * DataEngine::connectSource hands back a pre-existing container and delivers
+ * its *cached* data rather than running the command again; the process only
+ * starts when the container is first created. So re-issuing an identical
+ * command can report success without the camera moving at all, which is
+ * exactly what a stick held at full deflection produces every tick.
+ *
+ * `#` starts a comment in sh, so the trailing counter changes the key the
+ * engine sees without changing what runs.
+ */
+function uniqueify(cmd, seq) {
+    return cmd + " # " + seq;
+}
+
+// Directories searched for the binary, in order. Mirrors the resolver in
+// bin/linkctl-macro. $HOME is left for the shell to expand.
+var SEARCH_DIRS = [
+    "/usr/local/bin",
+    "/usr/bin",
+    "\"$HOME/.local/bin\"",
+    "\"$HOME/.cargo/bin\"",
+    "\"$HOME/.local/share/mise/shims\"",
+    "\"$HOME/.asdf/shims\"",
+    "/var/lib/flatpak/exports/bin"
+];
+
+/*
+ * Build a shell command that prints the absolute path of the binary.
+ *
+ * Plasma runs applet commands through KProcess::setShellCommand, which is
+ * `/bin/sh -c` inheriting plasmashell's environment. That environment never
+ * sources a login profile, so anything that puts linkctl on PATH from
+ * ~/.bashrc or similar (mise and asdf shims, ~/.local/bin on some distros) is
+ * invisible to the applet even though it works in a terminal. Searching
+ * explicitly is the only reliable way to find it.
+ */
+function resolveCommand(name) {
+    return "n=" + shq(name || "linkctl") + "; "
+        + "command -v \"$n\" 2>/dev/null || "
+        + "{ for d in " + SEARCH_DIRS.join(" ") + "; do "
+        + "[ -x \"$d/$n\" ] && printf '%s\\n' \"$d/$n\" && break; "
+        + "done; }";
+}
+
 /*
 * Build the shell command for one joystick tick.
 *
@@ -137,8 +187,25 @@ function errorMessage(stdout, stderr, exitCode) {
    } catch (e) {
        // not JSON, fall through to stderr
    }
+    // 127 is the shell's "command not found", which here means the resolved
+    // path has stopped being valid rather than anything about the camera.
+    if (exitCode === 127) {
+        return "linkctl could not be run. Set its full path in settings.";
+    }
    if (err !== "") {
        return err;
    }
+    // Exit codes that usually mean a pinned device node is stale. The Link's
+    // /dev/videoN numbering moves between boots and replugs.
+    if (exitCode === 3) {
+        return "Camera not found. If a device is set in settings, clear it: "
+            + "the node number changes between boots.";
+    }
+    if (exitCode === 4) {
+        return "Several cameras found. Set the device in settings.";
+    }
+    if (exitCode === 6) {
+        return "Permission denied. Add yourself to the 'video' group.";
+    }
    return "linkctl exited " + exitCode;
 }
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 branderson
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 /*
 * Insta360 Link Joystick - a Plasma 6 applet.
 *
@@ -22,8 +25,24 @@ import "logic.js" as Logic
 PlasmoidItem {
    id: root

-    readonly property string linkctl: Plasmoid.configuration.linkctlPath || "linkctl"
+    readonly property string configuredBin: Plasmoid.configuration.linkctlPath || "linkctl"
    readonly property string device: Plasmoid.configuration.device
+
+    // The binary's absolute path, found at startup. Empty until resolved, and
+    // commands are held back until then: Plasma runs these through a plain
+    // `sh -c` with plasmashell's environment, which does not include whatever
+    // a login shell adds to PATH, so a bare name often cannot be run here
+    // even when it works in a terminal.
+    // Starts as the configured name so commands always have something to
+    // run. The probe only upgrades this to an absolute path; it can never
+    // leave the widget unable to act.
+    property string resolvedBin: Plasmoid.configuration.linkctlPath || "linkctl"
+    property bool resolving: false
+    // Incremented per command so no two command strings are ever identical.
+    property int seq: 0
+    readonly property bool ready: root.resolvedBin !== ""
+    property string lastCmd: ""
+    property int lastExit: -1
    readonly property int stepMax: Plasmoid.configuration.maxStep
    readonly property int tickMs: Plasmoid.configuration.tickInterval
    readonly property bool invertPan: Plasmoid.configuration.invertPan
@@ -43,17 +62,24 @@ PlasmoidItem {
    property bool keyUp: false
    property bool keyDown: false

-    readonly property var keyVec: Logic.vectorFromKeys({
+    // Keyboard vector. Computed defensively on purpose: the pointer path
+    // reads inNx/inEngaged too, so anything that throws in here would
+    // disable dragging as well. Qt caches compiled QML and JS on disk, and a
+    // stale cached logic.js lacking a newer helper is enough to do it.
+    readonly property bool keyboardAvailable: typeof Logic !== "undefined"
+        && typeof Logic.vectorFromKeys === "function"
+    readonly property var keyVec: root.keyboardAvailable
+        ? Logic.vectorFromKeys({
              left: root.keyLeft, right: root.keyRight,
              up: root.keyUp, down: root.keyDown
          })
-    readonly property bool keyEngaged: root.keyVec.nx !== 0 || root.keyVec.ny !== 0
+        : { nx: 0, ny: 0 }
+    readonly property real keyNx: (root.keyVec && typeof root.keyVec.nx === "number")
+        ? root.keyVec.nx : 0
+    readonly property real keyNy: (root.keyVec && typeof root.keyVec.ny === "number")
+        ? root.keyVec.ny : 0
+    readonly property bool keyEngaged: root.keyNx !== 0 || root.keyNy !== 0

-    // The pointer wins while it is down, so a drag is never fought over by a
-    // key left held down underneath it.
-    readonly property real inNx: stick.held ? stick.nx : root.keyVec.nx
-    readonly property real inNy: stick.held ? stick.ny : root.keyVec.ny
-    readonly property bool inEngaged: stick.engaged || root.keyEngaged

    // WASD and the arrow keys. Returns "" for anything that is not a
    // movement key, so the handler can leave it unaccepted.
@@ -92,7 +118,25 @@ PlasmoidItem {
    }

    function baseCmd() {
-        return Logic.baseCmd(root.linkctl, root.device);
+        return Logic.baseCmd(root.resolvedBin, root.device);
+    }
+
+    // An absolute path is taken as given; anything else is searched for.
+    function resolveBinary() {
+        if (root.configuredBin.charAt(0) === "/") {
+            root.resolvedBin = root.configuredBin;
+            root.refresh();
+            root.refreshTracking();
+            return;
+        }
+        if (typeof Logic.resolveCommand !== "function") {
+            // Stale cached logic.js: keep the configured name and carry on.
+            root.refresh();
+            return;
+        }
+        root.statusText = "Looking for linkctl...";
+        root.resolving = true;
+        sh.exec(Logic.resolveCommand(root.configuredBin));
    }

    function absorb(stdout) {
@@ -125,6 +169,27 @@ PlasmoidItem {
            const err = (data.stderr || "").trim();
            disconnectSource(source);
            root.busy = false;
+            root.lastExit = code;
+            console.log("[insta360] exit", code, "out:", String(out).trim(),
+                        "err:", err);
+
+            if (root.resolving) {
+                root.resolving = false;
+                const found = String(out).trim().split("\n")[0].trim();
+                if (found !== "") {
+                    root.resolvedBin = found;
+                    root.refresh();
+                    root.refreshTracking();
+                } else {
+                    // Keep the configured name as the fallback rather than
+                    // blocking: on a packaged install it is on PATH anyway.
+                    root.statusText = "Could not locate linkctl; using '"
+                        + root.configuredBin + "'.";
+                    root.refresh();
+                }
+                return;
+            }
+
            if (code === 0) {
                root.absorb(out);
            } else {
@@ -134,7 +199,28 @@ PlasmoidItem {

        function exec(cmd) {
            root.busy = true;
-            connectSource(cmd);
+            root.seq += 1;
+            // Never reuse a command string: the engine would serve the
+            // previous run's cached output and not run anything.
+            const unique = (typeof Logic.uniqueify === "function")
+                ? Logic.uniqueify(cmd, root.seq)
+                : cmd + " # " + root.seq;
+            root.lastCmd = unique;
+            console.log("[insta360] run:", unique);
+            connectSource(unique);
+        }
+    }
+
+    Timer {
+        // Plasma's executable engine silently drops a request when an
+        // identical command is still running, so `busy` would otherwise be
+        // able to stick on and freeze every later step.
+        id: busyWatchdog
+        interval: 4000
+        running: root.busy
+        onTriggered: {
+            root.busy = false;
+            root.statusText = "linkctl did not respond in time.";
        }
    }

@@ -150,10 +236,37 @@ PlasmoidItem {
        sh.exec(root.baseCmd() + " " + args);
    }

-    Component.onCompleted: refresh()
+    property bool started: false
+    Component.onCompleted: {
+        root.started = true;
+        root.resolveBinary();
+    }
+
+    // Re-resolve if the configured path is edited. Guarded because this also
+    // fires while the component is still being set up, which would otherwise
+    // probe twice and duplicate every follow-up query.
+    onConfiguredBinChanged: {
+        if (!root.started) {
+            return;
+        }
+        root.resolvedBin = root.configuredBin;
+        root.resolveBinary();
+    }

    fullRepresentation: ColumnLayout {
        id: panel
+
+        // The combined pointer and keyboard vector. These live here, not on
+        // root, because `stick` is an id declared inside this Component and
+        // ids are not visible from the enclosing scope. Binding to it from
+        // root raised "ReferenceError: stick is not defined" and silently
+        // disabled every form of movement.
+        //
+        // The pointer wins while it is down, so a drag is never fought over
+        // by a key left held down underneath it.
+        readonly property real inNx: stick.held ? stick.nx : root.keyNx
+        readonly property real inNy: stick.held ? stick.ny : root.keyNy
+        readonly property bool inEngaged: stick.engaged || root.keyEngaged
        Layout.minimumWidth: Kirigami.Units.gridUnit * 14
        Layout.minimumHeight: Kirigami.Units.gridUnit * 22
        spacing: Kirigami.Units.smallSpacing
@@ -200,9 +313,6 @@ PlasmoidItem {
            Layout.fillWidth: true
            horizontalAlignment: Text.AlignHCenter
            text: {
-                if (isNaN(root.panDeg) && isNaN(root.tiltDeg)) {
-                    return root.statusText;
-                }
                const p = isNaN(root.panDeg) ? "?" : root.panDeg.toFixed(1);
                const t = isNaN(root.tiltDeg) ? "?" : root.tiltDeg.toFixed(1);
                return "Pan " + p + "°   Tilt " + t + "°";
@@ -210,6 +320,18 @@ PlasmoidItem {
            elide: Text.ElideRight
        }

+        // Always visible, so a failure part way through a session is not
+        // hidden behind a stale position readout.
+        PlasmaComponents.Label {
+            Layout.fillWidth: true
+            horizontalAlignment: Text.AlignHCenter
+            text: root.statusText
+            opacity: 0.7
+            font: Kirigami.Theme.smallFont
+            wrapMode: Text.WordWrap
+            maximumLineCount: 3
+        }
+
        Joystick {
            id: stick
            Layout.alignment: Qt.AlignHCenter
@@ -231,17 +353,19 @@ PlasmoidItem {
        }

        Timer {
+            id: moveTimer
            // Drives both input methods. Only runs while something is asking
            // for movement, so an idle popup costs nothing.
            interval: root.tickMs
            repeat: true
-            running: root.inEngaged
+            running: panel.inEngaged
            triggeredOnStart: true
            onTriggered: {
                if (root.busy) {
                    return;     // let the previous step finish, skip this one
                }
-                const cmd = Logic.tickCommand(root.baseCmd(), root.inNx, root.inNy,
+                const cmd = Logic.tickCommand(root.baseCmd(),
+                                              panel.inNx, panel.inNy,
                                              root.stepMax, root.invertPan,
                                              root.invertTilt);
                if (cmd !== "") {
@@ -259,6 +383,16 @@ PlasmoidItem {
                    root.refresh();
                }
            }
+            // Component.onCompleted can run before the popup is on screen, so
+            // the focus grab there does not always stick. Claim it again each
+            // time the popup opens, which is when the keys need to work.
+            function onExpandedChanged() {
+                if (root.expanded) {
+                    panel.forceActiveFocus();
+                } else {
+                    root.clearKeys();
+                }
+            }
        }

        RowLayout {
@@ -326,10 +460,81 @@ PlasmoidItem {
            icon.name: "view-refresh"
            text: "Refresh"
            onClicked: {
+                if (!root.ready) {
+                    root.resolveBinary();
+                } else {
                    root.refresh();
                    root.refreshTracking();
                }
            }
+        }
+
+        PlasmaComponents.Button {
+            id: diagToggle
+            Layout.fillWidth: true
+            focusPolicy: Qt.NoFocus
+            checkable: true
+            icon.name: "help-about"
+            text: "Diagnostics"
+        }
+
+        // Live internal state. Exists because every failure so far has
+        // presented as "nothing happens", which is the one symptom that
+        // carries no information.
+        //
+        // Deliberately one label built by one guarded function rather than a
+        // Repeater over an array of expressions: in that shape a single
+        // throwing sub-expression discards the whole model and the panel
+        // renders empty, which is the failure mode it is meant to diagnose.
+        PlasmaComponents.Label {
+            Layout.fillWidth: true
+            visible: diagToggle.checked
+            font: Kirigami.Theme.smallFont
+            opacity: 0.85
+            wrapMode: Text.WrapAnywhere
+            textFormat: Text.PlainText
+
+            function line(label, value) {
+                try {
+                    return label + ": " + value + "\n";
+                } catch (e) {
+                    return label + ": <error: " + e + ">\n";
+                }
+            }
+
+            text: {
+                let out = "";
+                try {
+                    out += line("binary", root.resolvedBin);
+                    out += line("configured", root.configuredBin);
+                    out += line("device",
+                                root.device === "" ? "(auto)" : root.device);
+                    out += line("helpers",
+                                "vectorFromKeys=" + root.keyboardAvailable
+                                + " uniqueify="
+                                + (typeof Logic !== "undefined"
+                                   && typeof Logic.uniqueify === "function")
+                                + " resolveCommand="
+                                + (typeof Logic !== "undefined"
+                                   && typeof Logic.resolveCommand === "function"));
+                    out += line("stick", "held=" + stick.held
+                                + " nx=" + stick.nx.toFixed(2)
+                                + " ny=" + stick.ny.toFixed(2)
+                                + " engaged=" + stick.engaged);
+                    out += line("keys", "nx=" + root.keyNx.toFixed(2)
+                                + " ny=" + root.keyNy.toFixed(2)
+                                + " focus=" + panel.activeFocus);
+                    out += line("input", "engaged=" + panel.inEngaged
+                                + " timer=" + moveTimer.running);
+                    out += line("busy", root.busy + " seq=" + root.seq
+                                + " lastExit=" + root.lastExit);
+                    out += line("lastCmd", root.lastCmd);
+                } catch (e) {
+                    out += "diagnostics failed: " + e;
+                }
+                return out;
+            }
+        }

        Item {
            Layout.fillHeight: true
@@ -10,7 +10,7 @@
        "Description": "Virtual joystick and quick controls for an Insta360 Link webcam",
        "Icon": "camera-web",
        "Id": "com.github.insta360linktools.joystick",
-        "License": "MIT",
+        "License": "GPL-3.0-or-later",
        "Name": "Insta360 Link Joystick",
        "Version": "1.0"
    },
@@ -0,0 +1,161 @@
+#!/usr/bin/env python3
+# SPDX-FileCopyrightText: 2026 branderson
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+"""Lint the applet's QML with the KDE types resolved.
+
+Why this exists
+---------------
+Running qmllint on the applet without the KDE QML modules present reports
+every single identifier inside `PlasmoidItem` as "Unqualified access",
+because the type cannot be resolved and so nothing inside it has a known
+scope. That is 87 warnings of pure noise on a clean file, which is why they
+were previously filtered out wholesale, and that filter hid a real one:
+
+    ReferenceError: stick is not defined
+
+`stick` is an id declared inside the `fullRepresentation` Component, and a
+property on the root object cannot see into that scope. The binding threw at
+runtime, so the movement timer never ran and every form of input silently
+stopped working. qmllint had flagged it; the filter discarded it.
+
+tests/qmlstubs holds minimal stand-ins for the KDE modules so qmllint can
+resolve the types and reason about scope properly. With those in place the
+only remaining unqualified accesses are the handful listed in ALLOWED below,
+so anything new is a genuine finding rather than noise.
+
+Run: python3 tests/lint_qml.py
+"""
+
+from __future__ import annotations
+
+import os
+import re
+import shutil
+import subprocess
+import sys
+
+HERE = os.path.dirname(os.path.abspath(__file__))
+ROOT = os.path.normpath(os.path.join(HERE, ".."))
+STUBS = os.path.join(HERE, "qmlstubs")
+
+TARGETS = [
+    "plasmoid/package/contents/ui/main.qml",
+    "plasmoid/package/contents/ui/Joystick.qml",
+]
+
+# Identifiers that are legitimately unqualified, with the reason. Keep this
+# list short and specific: a broad rule here is what let the scope bug
+# through last time.
+ALLOWED = {
+    # Ids declared on the outer component and used inside the nested
+    # fullRepresentation. QML resolves these at runtime under the default
+    # component behaviour; qmllint asks for "pragma ComponentBehavior: Bound"
+    # to make it explicit, which would change runtime semantics and is left
+    # as a separate decision.
+    "root",
+    "sh",
+    # Implicit property supplied by Repeater to its delegate.
+    "modelData",
+}
+
+def find_qmllint() -> str | None:
+    """Locate qmllint.
+
+    Set QMLLINT to point at a specific binary; otherwise the Qt and PySide6
+    names are tried on PATH. Qt ships it as qmllint (sometimes suffixed with
+    the Qt version), and PySide6-Essentials installs pyside6-qmllint.
+    """
+    override = os.environ.get("QMLLINT")
+    if override:
+        return override if os.path.exists(override) else None
+    for name in ("qmllint", "qmllint6", "qmllint-qt6", "pyside6-qmllint"):
+        found = shutil.which(name)
+        if found:
+            return found
+    return None
+
+
+def parse(output: str) -> tuple[list[tuple[str, str, str]], list[str]]:
+    """Return (unqualified findings, hard errors).
+
+    A finding is (file, line, symbol). The symbol is recovered from the caret
+    line qmllint prints beneath the offending source.
+    """
+    findings: list[tuple[str, str, str]] = []
+    errors: list[str] = []
+    lines = output.split("\n")
+    for i, line in enumerate(lines):
+        if line.startswith("Error:"):
+            errors.append(line)
+            continue
+        m = re.match(r"Warning: (.+?):(\d+):(\d+): Unqualified access", line)
+        if not m or i + 2 >= len(lines):
+            continue
+        src, caret = lines[i + 1], lines[i + 2]
+        col = caret.find("^")
+        if col < 0:
+            continue
+        end = col
+        while end < len(caret) and caret[end] == "^":
+            end += 1
+        findings.append((m.group(1), m.group(2), src[col:end]))
+    return findings, errors
+
+
+def main() -> int:
+    qmllint = find_qmllint()
+    if not qmllint:
+        print("SKIP: qmllint not found on PATH. Install Qt's qmllint, or "
+              "`pip install PySide6-Essentials` for pyside6-qmllint, or set "
+              "QMLLINT=/path/to/qmllint.")
+        return 0
+
+    env = dict(os.environ, LC_ALL="C.UTF-8")
+    failures = 0
+    checked = 0
+
+    for target in TARGETS:
+        path = os.path.join(ROOT, target)
+        if not os.path.exists(path):
+            print(f"FAIL {target}: missing")
+            failures += 1
+            continue
+        proc = subprocess.run(
+            [qmllint, "-I", STUBS, path],
+            capture_output=True, text=True, env=env, cwd=ROOT,
+        )
+        output = proc.stdout + proc.stderr
+        findings, errors = parse(output)
+        checked += 1
+
+        for err in errors:
+            print(f"FAIL {err}")
+            failures += 1
+
+        unexpected = [f for f in findings if f[2] not in ALLOWED]
+        if unexpected:
+            for _, line, sym in unexpected:
+                print(f"FAIL {target}:{line}: unqualified access to "
+                      f"'{sym}'. If this is an id from another component, "
+                      f"QML cannot resolve it from here.")
+                failures += 1
+        else:
+            allowed_count = len(findings)
+            print(f"ok   {target} "
+                  f"({allowed_count} allowed unqualified, 0 unexpected)")
+
+        # An unresolved import means the stubs have drifted and the scope
+        # analysis below it is worthless, so treat it as a failure.
+        if "was not found" in output:
+            for line in output.split("\n"):
+                if "was not found" in line:
+                    print(f"FAIL unresolved type in {target}: {line.strip()}")
+                    failures += 1
+
+    print(f"\n{checked} files linted, {failures} failures")
+    return 0 if failures == 0 else 1
+
+
+if __name__ == "__main__":
+    sys.exit(main())
@@ -0,0 +1,15 @@
+// SPDX-FileCopyrightText: 2026 branderson
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+pragma Singleton
+import QtQuick
+
+QtObject {
+    readonly property color textColor: "black"
+    readonly property color backgroundColor: "white"
+    readonly property color alternateBackgroundColor: "#eee"
+    readonly property color highlightColor: "blue"
+    readonly property color separatorColor: "#ccc"
+    readonly property font smallFont: Qt.font({ pointSize: 8 })
+    readonly property font defaultFont: Qt.font({ pointSize: 10 })
+}
@@ -0,0 +1,11 @@
+// SPDX-FileCopyrightText: 2026 branderson
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+pragma Singleton
+import QtQuick
+
+QtObject {
+    readonly property int gridUnit: 18
+    readonly property int smallSpacing: 4
+    readonly property int largeSpacing: 8
+}
@@ -0,0 +1,6 @@
+# SPDX-FileCopyrightText: 2026 branderson
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+module org.kde.kirigami
+singleton Units 1.0 Units.qml
+singleton Theme 1.0 Theme.qml
@@ -0,0 +1,6 @@
+// SPDX-FileCopyrightText: 2026 branderson
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+import QtQuick.Controls as QQC
+
+QQC.Button {}
@@ -0,0 +1,6 @@
+// SPDX-FileCopyrightText: 2026 branderson
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+import QtQuick.Controls as QQC
+
+QQC.Label {}
@@ -0,0 +1,6 @@
+// SPDX-FileCopyrightText: 2026 branderson
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+import QtQuick.Controls as QQC
+
+QQC.Slider {}
@@ -0,0 +1,7 @@
+# SPDX-FileCopyrightText: 2026 branderson
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+module org.kde.plasma.components
+Label 1.0 Label.qml
+Button 1.0 Button.qml
+Slider 1.0 Slider.qml
@@ -0,0 +1,13 @@
+// SPDX-FileCopyrightText: 2026 branderson
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+import QtQuick
+
+QtObject {
+    property string engine: ""
+    property var connectedSources: []
+    signal newData(string sourceName, var data)
+    function connectSource(source) {}
+    function disconnectSource(source) {}
+    function serviceForSource(source) { return null; }
+}
@@ -0,0 +1,5 @@
+# SPDX-FileCopyrightText: 2026 branderson
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+module org.kde.plasma.plasma5support
+DataSource 1.0 DataSource.qml
@@ -0,0 +1,17 @@
+// SPDX-FileCopyrightText: 2026 branderson
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+// The applet's configuration keys. Mirrors contents/config/main.xml; keep the
+// two in step, or the linter will not catch a typo in a key name.
+import QtQuick
+
+QtObject {
+    property string linkctlPath: "linkctl"
+    property string device: ""
+    property string homePreset: "home"
+    property int maxStep: 6
+    property int tickInterval: 160
+    property int deadzone: 15
+    property bool invertPan: false
+    property bool invertTilt: false
+}
@@ -0,0 +1,9 @@
+// SPDX-FileCopyrightText: 2026 branderson
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+pragma Singleton
+import QtQuick
+
+QtObject {
+    readonly property Configuration configuration: Configuration {}
+}
@@ -0,0 +1,19 @@
+// SPDX-FileCopyrightText: 2026 branderson
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+// Stub of PlasmoidItem, only as complete as the applet needs. Exists so
+// qmllint can resolve the type and therefore reason about scope; without it
+// every identifier inside the applet is reported as unqualified and the
+// genuine scope errors are indistinguishable from import noise.
+import QtQuick
+
+Item {
+    property Component fullRepresentation
+    property Component compactRepresentation
+    property int preferredRepresentation: 0
+    property bool expanded: false
+    property int status: 0
+    property string icon: ""
+    property string toolTipMainText: ""
+    property string toolTipSubText: ""
+}
@@ -0,0 +1,7 @@
+# SPDX-FileCopyrightText: 2026 branderson
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+module org.kde.plasma.plasmoid
+PlasmoidItem 1.0 PlasmoidItem.qml
+Configuration 1.0 Configuration.qml
+singleton Plasmoid 1.0 Plasmoid.qml
@@ -1,4 +1,7 @@
 #!/usr/bin/env python3
+# SPDX-FileCopyrightText: 2026 branderson
+# SPDX-License-Identifier: GPL-3.0-or-later
+
 """Tests for linkctl-gamepad's pure helpers.

 Run: python3 tests/test_gamepad.py
@@ -1,4 +1,7 @@
 #!/usr/bin/env bash
+# SPDX-FileCopyrightText: 2026 branderson
+# SPDX-License-Identifier: GPL-3.0-or-later
+
 #
 # End-to-end test of linkctl-gamepad's read loop, without a controller.
 #
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 branderson
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 /*
 * Tests for the joystick applet's pure helpers.
 * Run: node tests/test_joystick_logic.js
@@ -125,7 +128,54 @@ deep(ctx.absorb('{"pan":1}\nbroken {\n{"tilt":2}'), { pan: 1, tilt: 2 },
     "absorb survives a malformed line between good ones");
 deep(ctx.absorb('Pan: 12.3°'), {}, "absorb ignores human-readable output");

+// --- uniqueify ---------------------------------------------------------
+// Plasma's executable engine keys containers by command string and serves a
+// pre-existing container's cached output instead of re-running, so repeating
+// a command verbatim reports success without moving the camera.
+eq(ctx.uniqueify("'linkctl' --force 'center'", 1),
+   "'linkctl' --force 'center' # 1", "uniqueify appends a comment");
+eq(ctx.uniqueify("a", 1) === ctx.uniqueify("a", 2), false,
+   "successive sequence numbers differ");
+// The suffix must be a shell comment so it cannot alter what runs.
+eq(ctx.uniqueify("x", 7).includes(" # "), true, "suffix is a shell comment");
+// A diagonal tick is two chained commands; the suffix must land at the end
+// and so comment out nothing meaningful.
+const tc = ctx.tickCommand(B, 1, 1, 6, false, false);
+eq(ctx.uniqueify(tc, 3), tc + " # 3", "uniqueify appends after a chained command");
+
+// --- resolveCommand ----------------------------------------------------
+// Plasma runs applet commands through `sh -c` with plasmashell's environment,
+// which never sources a login profile. A bare name therefore has to be
+// searched for explicitly or the widget cannot run it at all.
+const rc = ctx.resolveCommand("linkctl");
+eq(rc.indexOf("n='linkctl';") === 0, true, "resolveCommand sets the name first");
+eq(rc.includes('command -v "$n"'), true, "resolveCommand tries PATH first");
+eq(rc.includes('"$HOME/.local/share/mise/shims"'), true,
+   "resolveCommand searches mise shims");
+eq(rc.includes('"$HOME/.local/bin"'), true, "resolveCommand searches ~/.local/bin");
+eq(rc.includes("/usr/local/bin"), true, "resolveCommand searches /usr/local/bin");
+eq(rc.includes('[ -x "$d/$n" ]'), true, "resolveCommand tests for executable");
+// $HOME must reach the shell unquoted-but-protected, never single-quoted,
+// or it would be looked up literally.
+eq(rc.includes("'$HOME"), false, "resolveCommand does not single-quote $HOME");
+
+// A hostile configured name must stay inert rather than running.
+const rcEvil = ctx.resolveCommand("x'; touch /tmp/pwned; '");
+eq(rcEvil.indexOf("n='x'\\''; touch /tmp/pwned; '\\'''") === 0, true,
+   "resolveCommand quotes a malicious binary name");
+
 // --- errorMessage ------------------------------------------------------
+eq(ctx.errorMessage("", "", 127),
+   "linkctl could not be run. Set its full path in settings.",
+   "errorMessage explains exit 127 as a missing binary");
+eq(ctx.errorMessage("", "", 3).includes("node number changes"), true,
+   "errorMessage points at a stale pinned device for exit 3");
+eq(ctx.errorMessage("", "", 6).includes("video"), true,
+   "errorMessage names the video group for exit 6");
+// A real message from linkctl still wins over the canned text.
+eq(ctx.errorMessage('{"error":"something specific"}', "", 3),
+   "something specific", "errorMessage prefers linkctl's own message");
+
 eq(ctx.errorMessage('{"error":"camera not found"}', "", 3), "camera not found",
   "errorMessage prefers the json error");
 eq(ctx.errorMessage("", "permission denied", 6), "permission denied",
@@ -1,3 +1,6 @@
+-- SPDX-FileCopyrightText: 2026 branderson
+-- SPDX-License-Identifier: GPL-3.0-or-later
+
 -- Lifecycle tests for obs/obs-linkctl.lua against a mock OBS API.
 -- Run: lua tests/test_obs_lifecycle.lua
 --
@@ -1,3 +1,6 @@
+-- SPDX-FileCopyrightText: 2026 branderson
+-- SPDX-License-Identifier: GPL-3.0-or-later
+
 -- Offline tests for the pure helpers in obs/obs-linkctl.lua.
 -- Run: lua tests/test_obs_linkctl.lua
 --
@@ -0,0 +1,127 @@
+#!/usr/bin/env bash
+# SPDX-FileCopyrightText: 2026 branderson
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+#
+# Checks the binary-resolution command the Plasma widget generates, by running
+# it in a real shell against real directories.
+#
+# This matters because Plasma executes applet commands through
+# KProcess::setShellCommand, which is `/bin/sh -c` inheriting plasmashell's
+# environment. That environment never sources a login profile, so anything
+# that puts linkctl on PATH from a shell rc file (mise or asdf shims,
+# ~/.local/bin on some distributions) is invisible to the widget even though
+# it works in a terminal. tests/test_joystick_logic.js checks the string's
+# shape; this checks that the string actually finds a binary.
+#
+# Run: tests/test_resolver.sh
+
+set -uo pipefail
+
+HERE=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)
+readonly HERE
+readonly LOGIC="$HERE/../plasmoid/package/contents/ui/logic.js"
+
+command -v node >/dev/null 2>&1 || { echo "SKIP: node not available"; exit 0; }
+
+# Ask logic.js for the command, so the test cannot drift from the shipped code.
+CMD=$(node -e '
+const fs = require("fs"), vm = require("vm");
+const src = fs.readFileSync(process.argv[1], "utf8");
+const ctx = { Math, JSON, String };
+vm.createContext(ctx);
+vm.runInContext(src.replace(/^\s*\.pragma\s+library\s*$/m, ""), ctx);
+process.stdout.write(ctx.resolveCommand("linkctl"));
+' "$LOGIC")
+
+[[ -n $CMD ]] || { echo "FAIL: could not generate the resolver command"; exit 1; }
+
+TMP=$(mktemp -d)
+cleanup() { rm -rf "$TMP"; }
+trap cleanup EXIT
+
+checks=0
+failures=0
+
+# Run the generated command with a deliberately bare environment, the way
+# plasmashell would, and compare what it prints.
+expect() {
+    local label=$1 home=$2 path=$3 want=$4 got
+    checks=$((checks + 1))
+    got=$(env -i HOME="$home" PATH="$path" sh -c "$CMD" 2>/dev/null)
+    if [[ $got == "$want" ]]; then
+        printf 'ok   %s\n' "$label"
+    else
+        failures=$((failures + 1))
+        printf 'FAIL %s\n       got:  %s\n       want: %s\n' \
+            "$label" "${got:-<empty>}" "${want:-<empty>}"
+    fi
+}
+
+make_exe() { mkdir -p "$(dirname "$1")" && printf '#!/bin/sh\n' > "$1" && chmod +x "$1"; }
+
+mkdir -p "$TMP/empty"
+
+# On PATH: the ordinary case, and the only one that worked before the fix.
+make_exe "$TMP/onpath/linkctl"
+expect "finds it on PATH" "$TMP/empty" "$TMP/onpath:/usr/bin:/bin" \
+    "$TMP/onpath/linkctl"
+
+# Not on PATH at all. These are the cases that broke the widget while the
+# terminal kept working.
+make_exe "$TMP/mise/.local/share/mise/shims/linkctl"
+expect "finds a mise shim off PATH" "$TMP/mise" "/usr/bin:/bin" \
+    "$TMP/mise/.local/share/mise/shims/linkctl"
+
+make_exe "$TMP/localbin/.local/bin/linkctl"
+expect "finds ~/.local/bin off PATH" "$TMP/localbin" "/usr/bin:/bin" \
+    "$TMP/localbin/.local/bin/linkctl"
+
+make_exe "$TMP/cargo/.cargo/bin/linkctl"
+expect "finds ~/.cargo/bin off PATH" "$TMP/cargo" "/usr/bin:/bin" \
+    "$TMP/cargo/.cargo/bin/linkctl"
+
+# Absent entirely: must print nothing, so the widget can say so plainly
+# rather than running something unexpected.
+expect "prints nothing when absent" "$TMP/empty" "/usr/bin:/bin" ""
+
+# Present but not executable must not count as found.
+mkdir -p "$TMP/noexec/.local/bin"
+printf 'not executable' > "$TMP/noexec/.local/bin/linkctl"
+expect "ignores a non-executable file" "$TMP/noexec" "/usr/bin:/bin" ""
+
+# PATH wins over the fallback list, so an explicit install is preferred.
+make_exe "$TMP/both/.local/bin/linkctl"
+make_exe "$TMP/preferred/linkctl"
+expect "prefers PATH over the search list" "$TMP/both" \
+    "$TMP/preferred:/usr/bin:/bin" "$TMP/preferred/linkctl"
+
+# The uniqueness suffix exists only to change the string Plasma keys its
+# command containers by. It must not change what the shell actually runs.
+ask_logic() {
+    node -e '
+const fs = require("fs"), vm = require("vm");
+const src = fs.readFileSync(process.argv[1], "utf8");
+const ctx = { Math, JSON, String };
+vm.createContext(ctx);
+vm.runInContext(src.replace(/^\s*\.pragma\s+library\s*$/m, ""), ctx);
+const tick = ctx.tickCommand(ctx.baseCmd("echo", ""), 1, 1, 6, false, false);
+process.stdout.write(process.argv[2] === "unique"
+    ? ctx.uniqueify(tick, 42) : tick);
+' "$LOGIC" "$1"
+}
+
+checks=$((checks + 1))
+plain_out=$(sh -c "$(ask_logic plain)" 2>&1)
+unique_out=$(sh -c "$(ask_logic unique)" 2>&1)
+if [[ $plain_out == "$unique_out" && -n $plain_out ]]; then
+    printf 'ok   %s\n' "uniqueness suffix does not change what the shell runs"
+else
+    failures=$((failures + 1))
+    printf 'FAIL %s\n       plain:  %s\n       unique: %s\n' \
+        "uniqueness suffix does not change what the shell runs" \
+        "$plain_out" "$unique_out"
+fi
+
+printf '\n%d checks, %d failures\n' "$checks" "$failures"
+[[ $failures -eq 0 ]]
Author	SHA1	Message	Date
branderson	53bdd7da86	Merge pull request 'Add GPL-3.0 licensing and prepare for a public repository' (#4 ) from public-repo-prep into main Reviewed-on: #4 Reviewed-by: branderson <brad@branderson.io>	2026-10-16 14:55:39 -07:00
brad	f95853dc25	Add GPL-3.0 licensing and prepare for a public repository metadata.json claimed MIT while no LICENSE file existed, so the repository had no effective licence at all. It is now GPL-3.0-or-later: the full FSF text in LICENSE, the identifier in metadata.json, and REUSE-style SPDX-FileCopyrightText and SPDX-License-Identifier headers on all 33 source files, which is the convention KDE itself uses. Worth recording that GPL-3.0 is a preference here rather than an obligation. Nothing in the dependency graph forces it: linkctl is MIT and is invoked as a subprocess rather than linked, and the KDE QML modules the applet imports are LGPL. Removed two things that should not ship in a public repository. tests's QML linter had an absolute sandbox path, /tmp/pyside/PySide6/qmllint, baked into its search list; it now looks for Qt's qmllint and PySide6's pyside6-qmllint on PATH and honours a QMLLINT override, and says how to install one when it finds nothing. The systemd unit carried a Documentation= URL pointing at a host that does not exist, and its ExecStart silently assumed a particular checkout directory; the URL is gone and the path is now an obvious PATH/TO/CHECKOUT placeholder next to the comment telling you to edit it. Added a Credits section naming the work this is built on, since the project is mostly glue: linkctl does the camera control, schlarpc's firmware teardown documents the extension-unit protocol, and vrwallace's controller established that the Link 2 needs both pan and tilt axes in a single VIDIOC_S_EXT_CTRLS call, which is the detail the whole thing depends on. Also made the two Python tests executable, matching the other scripts. Audited for operator-specific detail: no credentials, tokens, private hostnames, IP addresses or absolute home paths in any tracked file or anywhere in the history's diffs. Three merge commits do carry Reviewed-on and Reviewed-by trailers naming a private forge, added by the forge at merge time; those are commit metadata rather than file content and are handled separately. Tested: 169 checks across seven suites plus the QML linter, all passing after the header insertion, which confirms it did not disturb the order-sensitive `.pragma library` line in logic.js or the qmldir module definitions. shellcheck clean.	2026-10-13 20:54:23 -07:00
branderson	043dd69e5e	Merge pull request 'Fix QML scope error that disabled all camera movement, and close the lint gap that hid it' (#3 ) from widget-resolve-linkctl into main Reviewed-on: #3 Reviewed-by: branderson <brad@branderson.io>	2026-10-07 23:52:28 -07:00
brad	1f0d5ec0f4	Fix the QML scope error that disabled all camera movement The joystick, the keyboard and every movement command did nothing. The cause was in the journal all along: main.qml: ReferenceError: stick is not defined `stick` is the id of the Joystick inside the `fullRepresentation` Component. Ids declared inside a Component are not visible from the enclosing scope, so the inNx, inNy and inEngaged properties declared on the root object could not resolve it. Those bindings threw, inEngaged stayed false, the tick timer never ran, and no input of any kind produced a command. Everything else kept working, which is why status, zoom and binary resolution all looked healthy in the log while dragging did nothing. The three properties now live inside the fullRepresentation, where both `stick` and the root object are in scope. Also fixed from the same log: the configuration page logged "does not have a property called cfg_<name>Default" for all eight keys plus `title`, because Plasma assigns those when it instantiates a config page and they were never declared. They are declared now, so the Defaults button has something to compare against. Startup probed for the binary twice, because Component.onCompleted and onConfiguredBinChanged both fired while the component was still being set up, duplicating every follow-up query. The second path is now guarded. The diagnostics readout is one label built by one guarded function instead of a Repeater over an array of expressions. In that earlier shape a single throwing sub-expression discards the whole model and the panel renders empty, which is precisely the failure mode it is supposed to diagnose, and is what it did. The real repair is to the verification, in tests/lint_qml.py. qmllint had flagged `stick`, and a filter discarded it. Without the KDE QML modules present qmllint cannot resolve PlasmoidItem, so nothing inside it has a known scope and all 87 identifiers in a clean file are reported as unqualified access. Filtering that category wholesale was the only way to get a readable result, and it threw away the one finding that mattered. tests/qmlstubs now holds minimal stand-ins for org.kde.plasma.plasmoid, org.kde.plasma.components, org.kde.plasma.plasma5support and org.kde.kirigami, so the types resolve and the scope analysis is meaningful. With the stubs in place the only remaining unqualified accesses are `root`, `sh` and `modelData`, each allowlisted with a reason, so anything else is a genuine finding. Confirmed by reintroducing the bug: the linter fails and names the exact lines and identifier. Tested: 169 checks across seven suites plus the new linter, all passing. shellcheck clean.	2026-10-07 23:29:08 -07:00
brad	29b9971da8	Stop the keyboard path from disabling the pointer path Dragging the joystick stopped doing anything, at the same time as the keyboard support arrived and without the keyboard working either. One cause explains both. Before the keyboard existed, the tick timer ran on `stick.engaged` and read `stick.nx` directly, so dragging depended on nothing but the pad. Adding the keyboard routed that same path through the new helper: inEngaged reads keyEngaged, which reads keyVec, which calls Logic.vectorFromKeys. If that function is not callable the binding throws, keyVec is undefined, and inNx and inEngaged go with it, so the timer never runs and the pointer stops working too. Coupling the previously working path to brand new code with no fallback was the mistake, independent of why the helper might be missing. One way it can be missing: Qt caches compiled QML and JS on disk, and replacing an applet's files does not reliably invalidate that cache, so a stale compiled logic.js from before the helper was added is enough. install.sh now clears the cache on every install, which costs one slower load. The keyboard vector is now computed defensively and the pointer path reads plain numbers that cannot throw, so a missing or stale helper degrades to "no keyboard" rather than "nothing works". Removed the two gates that could also silently stop everything. resolvedBin starts as the configured name instead of empty, so there is always something to run and the search can only upgrade it; the tick timer no longer requires resolution to have succeeded; and refresh, action and refreshTracking no longer return early doing nothing. A failed probe keeps the fallback and says so rather than disabling the widget, which matters because a packaged install is on PATH regardless. Added a Diagnostics toggle showing live internal state: the resolved and configured binary, the device, which helpers are actually callable, the stick's own numbers, the keyboard vector, whether the panel holds focus, whether the timer is running, the busy flag, the sequence number, and the last command with its exit code. Every command and result also goes to the journal via console.log. Every failure so far has presented as "nothing happens", which is the one symptom that carries no information at all. Tested: 169 checks across seven suites, all passing. shellcheck clean, QML free of syntax errors. The cache clearing was exercised against a fake cache tree under a temporary XDG_CACHE_HOME. Not verified in a live Plasma session. The coupling described above is plain in the code and is a real defect whatever triggered it; whether a stale QML cache was the trigger is unconfirmed.	2026-10-07 23:19:28 -07:00
brad	82974f242d	Never reuse a command string for Plasma's executable engine Plasma's executable data engine keys its command containers by the command string. DataEngine::connectSource calls requestSource, which returns a pre-existing container when one matches, and then delivers that container's cached data; the process itself only starts when the container is first constructed. Re-issuing a byte-identical command therefore reports success, with a plausible exit code and stdout, while running nothing at all. That is precisely what the joystick produces. A stick held at full deflection emits the same command every tick, so the camera would take one step and then stop, with the widget showing no error because it received a successful result. The same applies to a key held down, and to repeated presses of Center or Home. Every command now carries a trailing shell comment holding a counter, so the engine never sees a string it has already cached. `#` starts a comment in sh, and the commands already contain quotes so they always go through sh -c, meaning the suffix changes the engine's key without changing what runs. Resolution state moved from comparing the probe's command string to a plain boolean, since the string is no longer stable across calls. Tested: 65 node checks, including that successive sequence numbers differ and that the suffix lands after a chained diagonal command. tests/test_resolver.sh additionally runs the generated command through a real shell both with and without the suffix and requires identical output, so the uniqueness trick cannot quietly alter behaviour. Full suite of 172 checks across seven suites passes, shellcheck clean, QML free of syntax errors. This is a defect established by reading Plasma's source, not a confirmed diagnosis of the reported fault. The two earlier theories for that fault, PATH resolution and a stale pinned device node, were both ruled out by the reporter: linkctl is installed from a pacman package into /usr/bin, and the widget's device field was never set.	2026-10-07 23:10:02 -07:00
brad	fa2d4e89d8	Resolve linkctl explicitly in the widget, and surface failures The widget could not run linkctl even though the binary worked fine from a terminal and through linkctl-macro. Plasma executes applet commands with KProcess::setShellCommand, which is `/bin/sh -c` inheriting plasmashell's own environment. That environment never sources a login profile, so any install that puts linkctl on PATH from a shell rc file is invisible to the widget: mise and asdf shims, and ~/.local/bin on some distributions. bin/linkctl-macro has carried a resolver for exactly this reason since it was written, and the widget should have had one too rather than trusting a bare name. It now searches the same locations at startup, caches the absolute path, and holds commands back until it has one. Three further changes, all about not failing silently. The status line is now always visible. It previously appeared only while the pan and tilt readout was unknown, so any failure after the first successful poll was hidden behind a stale position. errorMessage explains the exit codes that are easy to misread. 127 is the shell failing to run the binary rather than anything about the camera, and 3 most often means a pinned device node has moved, which happens because the Link's /dev/videoN number is not stable across power cycles or replugs. A watchdog clears the busy flag after four seconds. Plasma's executable engine silently drops a request while an identical command is still running, so a lost callback could leave busy set and freeze every subsequent step with nothing to indicate why. Also corrected the focus timing for the keyboard support: Component.onCompleted can run before the popup is on screen, where the focus grab does not stick, so the panel claims focus whenever the popup opens and clears held keys when it closes. Tested: 164 checks across seven suites, all passing. tests/test_resolver.sh is new and runs the generated resolver in a real shell against real directories, confirming it finds a binary on PATH, finds mise shims, ~/.local/bin and ~/.cargo/bin when they are not on PATH, prefers PATH when both exist, ignores a non-executable file, and prints nothing when the binary is genuinely absent. 11 new node checks cover the command's shape and confirm a hostile configured name stays quoted. Not verified against a live Plasma session. The PATH mechanism is established from KProcess's documented behaviour and the resolver from a real shell, but whether this was the actual cause on the reporter's machine is unconfirmed.	2026-10-07 22:51:23 -07:00
branderson	3cd99e7bf5	Merge pull request 'Add keyboard, gamepad and directional-shortcut control for the gimbal' (#2 ) from joystick-keyboard-and-gamepad into main Reviewed-on: #2 Reviewed-by: branderson <brad@branderson.io>	2026-10-07 22:27:07 -07:00