Take the emulator half out of run-android.sh
Which AVD this checkout means, creating it, booting it headless and refusing to start one the machine has no room for is the same sequence in ai-app, ai-app-2 and dev-updater. It now lives once, in ~/repos/emulator-tools, and this script is what is actually specific to this project: a build, an install and a launch. Three copies of "boot an emulator" was three places for the memory check none of them had -- starting one at 2.8 GB available invoked the OOM killer, and what it took first was another session's emulator. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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@@ -225,16 +225,19 @@ first if a remote spawn ever mangles an argument.
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The emulator app reaches it at `https://10.0.2.2:8443`; enroll it with
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`adb -s "$SERIAL" shell "am start -a android.intent.action.VIEW -d 'aiapp://enroll?host=10.0.2.2&port=8443&token=…'"`
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(quote so the device shell doesn't eat the `&`s).
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- **Name the device on every `adb` call.** This checkout runs its own
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emulator — `run-android.sh` derives the AVD name from the directory, so
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a second clone gets a second AVD rather than queueing for one shared
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machine-wide `tdep`. With more than one attached, a bare `adb shell` or
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`adb get-state` fails with `more than one device/emulator` and a bare
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`adb shell pm list packages` comes back **empty**, which reads as the app
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having been uninstalled rather than as the question being ambiguous.
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Get the serial the way `run-android.sh` does — match `adb -s <serial> emu
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avd name` against the AVD — or export `ANDROID_SERIAL`, which every
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`adb` call honours without `-s`.
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- **The emulator is `~/repos/emulator-tools`' business, not this repo's.**
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`emu up` creates and boots the AVD named after this checkout (`ai-app-2`),
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refusing when the machine has no room for one; `emu list` says what is
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attached and what it costs; `emu down` stops it. `run-android.sh` is that
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plus a build and an install. Run that repo's `install.sh` once if `emu` is
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missing.
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The `adb` on `PATH` after sourcing `android-env.sh` is that repo's wrapper,
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which fills in `-s` from the same rule — so a bare `adb shell` reaches this
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checkout's emulator and refuses to reach another one's. That defaulting is
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what makes the old advice unnecessary rather than wrong: with two attached
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and no `-s`, a bare `adb shell pm list packages` comes back **empty**,
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which reads as the app having been uninstalled rather than as the question
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being ambiguous.
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## Where things run (host vs this VM)
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+26
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@@ -1,7 +1,13 @@
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#!/bin/sh
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# Builds and runs this app on an emulator, creating/booting the AVD first if
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# it isn't already up. Same flow as dev-updater's run-android.sh; see that
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# script for the reasoning behind the avd handling.
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# Builds this app and runs it on this checkout's emulator.
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#
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# The emulator half of this -- which AVD this checkout means, creating it,
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# booting it headless, and refusing to start one the machine has no room for
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# -- lives in ~/repos/emulator-tools and is shared with every other Android
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# checkout here. This script kept its own copy of that sequence until
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# 2026-08-30, as did dev-updater's and ai-app's, and three copies of "boot an
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# emulator" is three places for the memory check that was missing from all of
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# them.
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#
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# Environment setup (SDK location, PATH, ...) lives in ./android-env.sh,
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# which can also be sourced directly for one-off commands.
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@@ -9,105 +15,34 @@ set -eu
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APP_ID="com.example.aiapp"
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DEVICE_PROFILE="${DEVICE_PROFILE:-pixel_10}"
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SYSTEM_IMAGE="${SYSTEM_IMAGE:-system-images;android-36;google_apis;x86_64}"
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SCRIPT_DIR=$(cd "$(dirname "$0")" && pwd)
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cd "$SCRIPT_DIR"
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# One AVD per checkout, named after it -- so two clones of this repo, or a
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# clone and a worktree, each get their own rather than fighting over one.
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# This used to default to a machine-wide "tdep", which made the emulator the
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# one thing here that could not be worked on in parallel: taking it meant
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# asking whoever had it, waiting, and handing it back, and installing onto a
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# running one steals the foreground from whatever they were looking at.
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# Derived rather than written down, so neither clone names the other's.
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# Override with AVD_NAME=... to share one deliberately.
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AVD_NAME="${AVD_NAME:-$(basename "$(dirname "$SCRIPT_DIR")")}"
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# shellcheck source=./android-env.sh
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. ./android-env.sh
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# Prints the adb serial of a running instance of AVD "$1", or nothing.
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avd_serial() {
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for s in $(adb devices | awk '$2 == "device" {print $1}'); do
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if [ "$(adb -s "$s" emu avd name 2>/dev/null | head -n1 | tr -d '\r')" = "$1" ]; then
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echo "$s"
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return 0
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fi
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done
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}
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echo "==> Ensuring emulator system image is installed"
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android sdk install emulator "$SYSTEM_IMAGE" || echo " (non-fatal: see above)"
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if [ ! -f "$ANDROID_AVD_HOME/$AVD_NAME.ini" ]; then
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echo "==> Creating AVD '$AVD_NAME' ($DEVICE_PROFILE, $SYSTEM_IMAGE)"
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echo no | avdmanager create avd \
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-n "$AVD_NAME" \
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-k "$SYSTEM_IMAGE" \
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--device "$DEVICE_PROFILE" \
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--sdcard 512M
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else
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echo "==> Reusing existing AVD '$AVD_NAME'"
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if ! command -v emu >/dev/null 2>&1; then
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echo "run-android.sh: no 'emu' command." >&2
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echo " It comes from ~/repos/emulator-tools; run that repo's ./install.sh." >&2
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exit 127
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fi
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# Host keyboard into the emulator -- this app has text fields.
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CONFIG_INI="$ANDROID_AVD_HOME/$AVD_NAME.avd/config.ini"
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if [ -f "$CONFIG_INI" ]; then
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grep -v '^hw\.keyboard=' "$CONFIG_INI" >"$CONFIG_INI.tmp"
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echo "hw.keyboard=yes" >>"$CONFIG_INI.tmp"
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mv "$CONFIG_INI.tmp" "$CONFIG_INI"
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fi
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SERIAL=$(avd_serial "$AVD_NAME")
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if [ -n "$SERIAL" ]; then
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echo "==> Emulator '$AVD_NAME' already running ($SERIAL)"
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else
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# Clean up a stray/crashed process for this AVD, if any. The bracketed
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# first character keeps the pattern from matching the shell running
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# this script -- unbracketed, this kills that shell mid-run.
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pkill -f "[e]mulator.*-avd $AVD_NAME" >/dev/null 2>&1 || true
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EMU_LOG="/tmp/$AVD_NAME-emulator.log"
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: >"$EMU_LOG"
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if [ -n "${DISPLAY:-}" ] || [ -n "${WAYLAND_DISPLAY:-}" ]; then
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echo "==> Starting emulator '$AVD_NAME' with GPU acceleration (-gpu host)"
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emulator -avd "$AVD_NAME" -gpu host -no-audio >"$EMU_LOG" 2>&1 &
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else
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echo "==> No display -- starting emulator '$AVD_NAME' headless (-gpu swiftshader_indirect)"
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emulator -avd "$AVD_NAME" -gpu swiftshader_indirect -no-audio -no-window \
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>"$EMU_LOG" 2>&1 &
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fi
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EMU_PID=$!
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i=0
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booted=""
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while [ "$i" -lt 150 ]; do
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if ! kill -0 "$EMU_PID" 2>/dev/null; then
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echo "Emulator process exited unexpectedly. Log output:" >&2
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cat "$EMU_LOG" >&2
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exit 1
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fi
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SERIAL=$(avd_serial "$AVD_NAME")
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if [ -n "$SERIAL" ]; then
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booted=$(adb -s "$SERIAL" shell getprop sys.boot_completed 2>/dev/null | tr -d '\r')
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[ "$booted" = "1" ] && break
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fi
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i=$((i + 1))
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sleep 2
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done
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if [ "$booted" != "1" ]; then
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echo "Emulator did not finish booting in time. Log output:" >&2
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cat "$EMU_LOG" >&2
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exit 1
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fi
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fi
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# Prints the serial, having created and booted the AVD if it had to. Named
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# after the checkout, so this cannot land on another session's emulator --
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# and refuses rather than starting one when the machine is short of memory,
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# because what an OOM kills is somebody else's work rather than the emulator
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# that asked for the memory.
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echo "==> Emulator"
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SERIAL=$(emu up)
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export ANDROID_SERIAL="$SERIAL"
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echo "==> Building debug APK"
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./gradlew :androidApp:assembleDebug
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APK="androidApp/build/outputs/apk/debug/androidApp-debug.apk"
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echo "==> Installing and launching $APK"
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adb -s "$SERIAL" install -r "$APK"
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adb -s "$SERIAL" shell am start -n "$APP_ID/.MainActivity"
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# ANDROID_SERIAL above is what aims these; the adb wrapper would work it out
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# from the checkout anyway, but a script that says which device it means does
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# not depend on being run from the right directory.
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adb install -r "$APK"
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adb shell am start -n "$APP_ID/.MainActivity"
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