jschoubben
125929dbc4
Claude-Session: https://claude.ai/code/session_01JG73KJNrH5EgFXMKKYSrig
triggerhappy
The machine's hotkeys (novox/hq ADR 0212). triggerhappy is the daemon that sees the keys the window
manager never does, such as a laptop's vendor keys. This module holds node-hotkeys and owns the
daemon's configuration and service. The keys themselves belong to the modules they are for.
What it owns
/etc/triggerhappy/triggers.d/mesh.conf |
every module's trigger lines, placed with ${contribution:node-hotkeys:trigger} in module order, each module's under a # <module> line |
triggerhappy.service.d/mesh.conf |
the daemon reads only the mesh's file, and runs every trigger as the operator's account (--user), after opening the devices as root |
triggerhappy.service |
running and enabled; restarted when either file changes |
How a module adds a key
A module declares a contributions entry with seat node-hotkeys, kind trigger, and as
content one or more trigger lines in triggerhappy's own grammar: the key, its state (1 pressed,
2 held, 0 released), and the command. The command runs as the operator's account. It needs no
su and should name the contributing module's own scripts. The contribution depends on this seat
(ADR 0210), so a module with keys is refused on a machine without a hotkey holder.
To find a key's name, press it while triggerhappy_dump listens.
Tools
| tool | |
|---|---|
triggerhappy_keys |
every trigger in force: key, state, command, file and contributing module; warns about a key bound twice |
triggerhappy_devices |
the input devices, by name and event handler |
triggerhappy_dump |
listen for a few seconds and say which keys arrived (needs sudo -n) |
triggerhappy_check |
running, as the account, only the mesh's file, no duplicates |
Installed as found
triggerhappy is not in the distribution's repositories, so the host cannot install it, and the module declares no package. It depends on the machine having it: the service resource refuses loudly, by name, on a machine without it. How software from the user repository reaches the mesh, as a pinned archive (ADR 0205) or through a repository the mesh serves, is research 027's first question.
Migration
On the laptop, the model's module wrote asus-g14.conf and its own drop-in. Both move here: the
model's module now contributes its keys. When it is pushed, the host gives back the original
asus-g14.conf it kept, which still calls the predecessor's as-user scripts. Delete that file
afterwards. The daemon reads only mesh.conf from then on, so the file would not fire, but
triggerhappy_check flags any file besides the mesh's.
Files it does not know
Each directory or archive this module declares says how it treats a file it did not write (ADR 0422, ADR 0416).
/etc/systemd/system/triggerhappy.service.d: everything in it is the program's; the mesh moves nothing out (ADR 0422 §2)./etc/triggerhappy/triggers.d: everything in it is the program's; the mesh moves nothing out (ADR 0422 §2).