Streamline repro_gioui_hang.sh
Shorter header (bug in two lines), one combined emulator wait loop, am start -S replaces the separate force-stop, fewer section comments. Same behavior: verified REPRODUCED (exit 0) on the emulator.
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#!/usr/bin/env bash
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# Reproduce the gioui Android activity-recreation hang with a STOCK gioui
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# example app (the "hello" example from gioui.org/example).
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# gioui v0.10.x Android bug: after the activity is recreated (relaunch,
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# config change), the second GioView.onCreateView sends its window-creation
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# ack on the UI thread with no receiver -> the UI thread deadlocks, the
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# window never gets an input channel, the app is black and unresponsive.
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#
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# What it does:
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# 1. Builds gioui.org/example's hello app (unmodified) with gogio.
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# 2. Installs it on an emulator (boots one if needed).
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# 3. Recreates the activity via `cmd uimode night yes` (uiMode is not in
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# gioui's configChanges mask, so Android destroys/recreates the
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# activity in the same process).
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# 4. Taps the app and checks logcat for NO_INPUT_CHANNEL.
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# This script runs the stock gioui "hello" example on an emulator, recreates
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# its activity with a uiMode toggle, taps it, and greps logcat.
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#
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# The bug (gioui v0.10.x, app/os_android.go onCreateView): on re-attach the
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# second onCreateView sends the window-creation ack
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# (mainWindow.windows <- struct{}{}) on the UI thread, but its only
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# receiver (newWindow in Window.init) never re-runs on Android — the driver
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# is never reset, so w.Event() never returns to re-init. The UI thread
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# blocks forever, the activity never attaches an input channel, and the app
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# is black and unresponsive (process still alive).
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#
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# Usage:
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# scripts/repro_gioui_hang.sh [avd-name] [path-to-apk]
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#
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# Exit codes: 0 = bug REPRODUCED, 1 = not reproduced, 2 = setup failure.
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# scripts/repro_gioui_hang.sh [avd] [apk] (apk omitted: build stock example)
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# exit 0 = REPRODUCED, 1 = clean, 2 = setup failure
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set -euo pipefail
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AVD=${1:-pad_avd}
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APK=${2:-}
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SDK=${ANDROID_HOME:-$HOME/android-sdk}
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export PATH=$PATH:$HOME/go/bin:$SDK/platform-tools:$SDK/build-tools/35.0.0
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say() { printf '\n=== %s\n' "$*"; }
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die() { say "FAIL: $*"; exit 2; }
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# --- 1. Build the stock hello example, unless an APK was supplied ---------
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# 1. Build the stock example, if an APK was not supplied
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if [ -z "$APK" ]; then
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say "building stock gioui.org/example hello (v0.10.3)"
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SRC=$(mktemp -d)
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trap 'rm -rf "$SRC"' EXIT
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say "building stock gioui.org/example hello app (v0.10.3)"
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go mod download gioui.org/example@v0.10.3
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cp "$HOME/go/pkg/mod/gioui.org/example@v0.10.3/hello/hello.go" "$SRC/main.go"
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cat > "$SRC/go.mod" <<'EOF'
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module hello
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go 1.23
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require gioui.org v0.10.3
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EOF
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(cd "$SRC" && go mod tidy && gogio -target android -targetsdk 34 -arch amd64 -o /tmp/hello-gioui-repro.apk .)
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APK=/tmp/hello-gioui-repro.apk
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printf 'module hello\n\ngo 1.23\n\nrequire gioui.org v0.10.3\n' > "$SRC/go.mod"
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(cd "$SRC" && go mod tidy && gogio -target android -targetsdk 34 -arch amd64 -o "$SRC/hello.apk" .)
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APK=$SRC/hello.apk
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fi
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[ -f "$APK" ] || die "APK not found: $APK"
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# --- 2. Emulator: reuse a booted one or start $AVD ------------------------
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say "waiting for emulator (avd $AVD)"
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# 2. Emulator: reuse a booted one, else boot $AVD
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say "emulator ($AVD)"
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EMU=""
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for _ in $(seq 1 60); do
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EMU=$(adb devices | awk '$1 ~ /^emulator-/ {print $1; exit}')
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[ -n "$EMU" ] && break
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emulator -avd "$AVD" -no-window -no-audio -no-boot-anim -gpu swiftshader_indirect >/dev/null 2>&1 &
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[ -n "$EMU" ] && [ "$(adb -s "$EMU" shell getprop sys.boot_completed 2>/dev/null | tr -d '\r')" = "1" ] && break
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[ -z "$EMU" ] && emulator -avd "$AVD" -no-window -no-audio -no-boot-anim -gpu swiftshader_indirect >/dev/null 2>&1 &
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sleep 5
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done
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[ -n "$EMU" ] || die "no emulator available"
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for _ in $(seq 1 60); do
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bc=$(adb -s "$EMU" shell getprop sys.boot_completed 2>/dev/null | tr -d '\r')
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[ "$bc" = "1" ] && break
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sleep 5
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done
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[ "$(adb -s "$EMU" shell getprop sys.boot_completed | tr -d '\r')" = "1" ] || die "emulator did not boot"
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[ -n "$EMU" ] || die "no booted emulator"
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say "emulator: $EMU"
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# --- 3. Install + launch ---------------------------------------------------
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# 3. Install + launch
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APPID=localhost.hello # gogio's default app id for module "hello"
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adb -s "$EMU" install -r "$APK" >/dev/null
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adb -s "$EMU" shell am force-stop "$APPID" >/dev/null 2>&1 || true
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adb -s "$EMU" logcat -c
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adb -s "$EMU" shell am start -n "$APPID/org.gioui.GioActivity" >/dev/null
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adb -s "$EMU" shell am start -S -n "$APPID/org.gioui.GioActivity" >/dev/null
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sleep 5
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adb -s "$EMU" shell pidof "$APPID" >/dev/null || die "app did not start"
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say "baseline: app running"
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# --- 4. Recreate the activity ----------------------------------------------
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# uiMode is not in gioui's configChanges mask -> Android recreates the
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# activity. Force a real state change (a no-op toggle recreates nothing).
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cur=$(adb -s "$EMU" shell cmd uimode night | tr -d '\r') # "Night mode: yes/no"
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case $cur in
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# 4. Recreate the activity, then tap and check logcat.
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# Toggle to the OPPOSITE uiMode: a no-op toggle recreates nothing.
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case $(adb -s "$EMU" shell cmd uimode night | tr -d '\r') in
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*yes*) adb -s "$EMU" shell cmd uimode night no >/dev/null ;;
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*) adb -s "$EMU" shell cmd uimode night yes >/dev/null ;;
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esac
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@ -92,11 +60,11 @@ adb -s "$EMU" logcat -c
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adb -s "$EMU" shell input tap 540 1200
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sleep 2
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# --- 5. Verdict -------------------------------------------------------------
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# 5. Verdict
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adb -s "$EMU" exec-out screencap -p > /tmp/gioui-hang-repro.png
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if adb -s "$EMU" logcat -d | grep -q NO_INPUT_CHANNEL; then
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say "REPRODUCED: activity recreation left the window with NO_INPUT_CHANNEL (see /tmp/gioui-hang-repro.png)"
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say "REPRODUCED: window has NO_INPUT_CHANNEL after recreation (screenshot: /tmp/gioui-hang-repro.png)"
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exit 0
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fi
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say "NOT reproduced: no NO_INPUT_CHANNEL after recreation (gioui handles re-attach correctly)"
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say "NOT reproduced: gioui handles re-attach cleanly"
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exit 1
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