MPC Add-Ins patch for 3.10

On MPC OS 3.10 (Gen2), addins load through a systemd drop-in in /run (tmpfs) that is lost after every reboot. This patch installs a Lua device script on the persistent content drive that MPC runs at every start. If addins in /data/mpc-addins are not loaded, it writes the /run drop-in and restarts MPC once. The user sees one automatic restart after a reboot; after that, all addins work. Does not modify the system image. Tested on a Live III (MPC OS 3.10, 2026-11-03): survives a full reboot, five addins restored.

Restore MPC add-ins (LD_PRELOAD addins in /data/mpc-addins) after a reboot on MPC OS 3.10 (Gen2 / aarch64).

The problem

On MPC OS 3.10, addins load through a systemd drop-in in /run (tmpfs). After every reboot that drop-in is gone, so the addins do not load until someone writes it again. This means SSH'ing in and re-running install scripts after every power cycle.

What this patch does

Installs a Lua device script on the persistent content drive (/nvme on a Live III, /sdcard on others). MPC loads device scripts from MPC Documents/Devices/ at every start. The script:

Checks /data/mpc-addins/ for installed addins
Checks MPC's LD_PRELOAD to see if they are loaded
If any are missing: writes the /run/systemd/system/acvs.service.d/90-mpc-addins.conf drop-in
Schedules a single detached systemctl restart acvs (8-second delay)
A guard file (/run/addin-restore-done) prevents restart loops

The user sees one automatic MPC restart after a reboot. After that, all addins work.

Usage

# Copy to the device
scp addin-restore-patch.sh root@<device-ip>:/tmp/

# SSH in
ssh root@<device-ip>

# Check the current state
sh /tmp/addin-restore-patch.sh status

# Install
sh /tmp/addin-restore-patch.sh install

# Remove
sh /tmp/addin-restore-patch.sh uninstall

Or install through the Plugin Manager app's patches section.

Requirements

Gen2 device (aarch64): Live III, MPC Key 61/37, etc.
MPC OS 3.10
At least one addin installed in /data/mpc-addins/

What it installs

Three files in <content root>/MPC Documents/Devices/Addin Restore/:

File	Purpose
`addin_restore.ini`	Device script registration (device name, checksum)
`addin_restore.lua`	Lua script: discovers the .so path, calls it via `package.loadlib()`
`addin_restore.so`	Native aarch64 library: reads addins, checks LD_PRELOAD, writes drop-in, restarts

All files are on the persistent content drive. They survive reboots and firmware updates. The system image is not modified.

Uninstall

sh addin-restore-patch.sh uninstall removes the three files. Addins already loaded in the current session are not affected. After the next reboot, addins will not be restored automatically.

All device patches