#!/usr/bin/env bash

# Runs the Desktop Head Unit loopback against the Pixel 8: adb forward,

# fresh logcat capture, and the DHU in its own window.

#

# Usage:

# ./dhu # full loop, log to analysis/dhu-<timestamp>.log

# ./dhu --no-log # skip the logcat capture (DHU only)

# ./dhu --device-id 44050DLJH001PC # target a different device

#

# Notes:

# DHU is interactive: piping its stdout closes stdin and it exits, so it

# always launches detached. `adb logcat -d` has proven unreliable (stale

# buffer); this captures live to a file instead.

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

DEVICE_ID="44050DLJH001PC"

NO_LOG=0

while [[ $# -gt 0 ]]; do

case "$1" in

-h|--help|help)

sed -n '2,/^set -euo/p' "$SCRIPT_DIR/dhu" | sed 's/^# \{0,1\}//' | head -n -1; exit 0;;

--no-log|--nolog|-NoLog) NO_LOG=1; shift;;

--device-id|-DeviceId) DEVICE_ID="${2:?--device-id needs a value}"; shift 2;;

--device-id=*) DEVICE_ID="${1#--device-id=}"; shift;;

*) echo "Error: unknown arg '$1'. Usage: ./dhu [--no-log] [--device-id SERIAL]" >&2; exit 1;;

esac

done

# SDK location: prefer env, then the usual per-OS defaults.

DHU_EXE=""

for base in "${ANDROID_HOME:-}" "${ANDROID_SDK_ROOT:-}" "$HOME/Android/Sdk" "$HOME/Library/Android/sdk" "/c/Android/Sdk" "C:/Android/Sdk"; do

[[ -n "$base" && -x "$base/extras/google/auto/desktop-head-unit" ]] && { DHU_EXE="$base/extras/google/auto/desktop-head-unit"; break; }

[[ -n "$base" && -x "$base/extras/google/auto/desktop-head-unit.exe" ]] && { DHU_EXE="$base/extras/google/auto/desktop-head-unit.exe"; break; }

done

if [[ -z "$DHU_EXE" ]]; then

echo "Error: DHU not found (looked under ANDROID_HOME, ~/Android/Sdk, ~/Library/Android/sdk, /c/Android/Sdk)." >&2

exit 1

fi

# The phone listens; the DHU reaches it through the forward.

adb -s "$DEVICE_ID" forward tcp:5277 tcp:5277

echo "forward tcp:5277 -> $DEVICE_ID"

if [[ $NO_LOG -eq 0 ]]; then

adb -s "$DEVICE_ID" logcat -c

stamp="$(date +%Y%m%d-%H%M%S)"

logfile="$SCRIPT_DIR/analysis/dhu-$stamp.log"

mkdir -p "$SCRIPT_DIR/analysis"

nohup adb -s "$DEVICE_ID" logcat -v time \

MaAuto.Service:V MaAuto.Server:V MaAuto.Video:V MaAuto.Sensors:V \

MaAuto.Input:V MaAuto.HostManager:V MaAuto.HostSession:V '*:S' \

>"$logfile" 2>&1 &

echo "logcat -> $logfile (pid $!)"

fi

if [[ "${OS:-}" == "Windows_NT" ]]; then

# git-bash: `start` detaches the GUI like Start-Process did.

start "" "$DHU_EXE"

else

nohup "$DHU_EXE" >/dev/null 2>&1 &

fi

echo "DHU launched (detached)"