Clipboard sync in Waydroid using WSL

clipboard_sync.md

Install the following dependencies:

sudo apt install wl-clipboard python3-pip
sudo pip3 install --break-system-packages pyclip

Add into ~/.config/weston.ini:

[autolaunch]
path=~/.local/bin/weston-clip-bridge

Create the following file into ~/.local/bin/weston-clip-bridge:

#!/bin/sh
export XDG_RUNTIME_DIR="${XDG_RUNTIME_DIR:-/run/user/$(id -u)}"

# Single instance only because concurrent bridges corrupt each other's transfers
exec 9>"$XDG_RUNTIME_DIR/weston-clip-bridge.lock"
flock -n 9 || exit 0

PS=/mnt/c/Windows/System32/WindowsPowerShell/v1.0/powershell.exe
CLIP=/mnt/c/Windows/System32/clip.exe

read_win() { "$PS" -NoProfile -NonInteractive -Command "Get-Clipboard -Raw" 2/dev/null | tr -d "\r"; }
read_w0()  { WAYLAND_DISPLAY=wayland-0 wl-paste -n 2>/dev/null; }
read_w1()  { WAYLAND_DISPLAY=wayland-1 wl-paste -n 2>/dev/null; }

# Baseline per source, no propagation at startup - a change is only
# a value that differs from what THAT source held last time we looked.
last_w=$(read_win)
last_a=$(read_w0)
last_b=$(read_w1)

tick=0
while sleep 1; do
    tick=$((tick + 1))
    a=$(read_w0)
    b=$(read_w1)
    w=$last_w
    [ $((tick % 2)) -eq 0 ] && w=$(read_win)

    new=""
    if [ -n "$w" ] && [ "$w" != "$last_w" ]; then
        new=$w
    elif [ -n "$a" ] && [ "$a" != "$last_a" ]; then
        new=$a
    elif [ -n "$b" ] && [ "$b" != "$last_b" ]; then
        new=$b
    fi

    if [ -n "$new" ]; then
        [ "$new" != "$a" ] && printf %s "$new" | WAYLAND_DISPLAY=wayland-0 wl-copy 2>/dev/null
        [ "$new" != "$b" ] && printf %s "$new" | WAYLAND_DISPLAY=wayland-1 wl-copy 2>/dev/null
        [ "$new" != "$w" ] && printf %s "$new" | "$CLIP" 2>/dev/null
        last_w=$new
        last_a=$new
        last_b=$new
    else
        last_w=$w
        last_a=$a
        last_b=$b
    fi
done

Example of full ~/.config/weston.ini. Use LF line endings.

[core]
backend=wayland-backend.so

[output]
name=wayland0
mode=1600x900

[shell]
binding-modifier=ctrl

[autolaunch]
path=/home/martin/.local/bin/weston-clip-bridge