Make android/install-apk always stale

This effectively leaves the staleness checking to adb install, as it should be done: adb has insight into the state of the system, we don't. Newer versions of android can do incremental installs too, so reinstalling the same thing is essentially free.

Also invoke android/install-apk in the debug script to make sure that the app being debugged is up to date.

android/debug.sh

@@ -5,12 +5,22 @@
 set -euo pipefail
 IFS=$'\n\t'
 
+function get_buildoption() {
+	jq -r '.[] | select(.name == "'$1'") | .value' < meson-info/intro-buildoptions.json
+}
+
 # customize
 default_app_id=uk.co.powdertoy.tpt
+default_app_exe=powder
+in_build_site=no
 if which jq >/dev/null && [[ -f meson-info/intro-buildoptions.json ]]; then
-	default_app_id=$(jq -r '.[] | select(.name == "app_id") | .value' < meson-info/intro-buildoptions.json)
+	# pwd is most likely a build site
+	in_build_site=yes
+	default_app_id=$(get_buildoption app_id)
+	default_app_exe=$(get_buildoption app_exe)
 fi
 app_id=${APP_ID:-$default_app_id}
+app_exe=${APP_EXE:-$default_app_exe}
 lldb_server=${LLDB_SERVER:-/opt/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/lib/clang/17/lib/linux/aarch64/lldb-server}
 lldb_server_port=${LLDB_SERVER_PORT:-9998}
 jdb_port=${JDB_PORT:-13456}
@@ -26,7 +36,7 @@ pidof_retry_count=${PIDOF_RETRY_COUNT:-20}
 pidof_retry_delay=${PIDOF_RETRY_DELAY:-0.1}
 
 function check_which() {
-	if ! which $1; then
+	if ! which $1 >/dev/null; then
 		>&2 echo "[-] can't run $1"
 		return 1
 	fi
@@ -46,6 +56,39 @@ function check_adb() {
 	$adb shell whoami >/dev/null
 }
 
+function maybe_install_app() {
+	if [[ $in_build_site != yes ]]; then
+		>&2 echo "[+] not in a build site, not adb installing anything"
+		return 0
+	fi
+	android_keystore=$(get_buildoption android_keystore)
+	android_keyalias=$(get_buildoption android_keyalias)
+	if [[ -z ${ANDROID_KEYSTORE_PASS-} ]]; then
+		>&2 cat << HELP
+The current directory seems to be a build site, but ANDROID_KEYSTORE_PASS is not set, so android/$app_exe.apk cannot be invoked. If you don't have a keystore yet, create one with:
+
+  ANDROID_KEYSTORE_PASS=bagelsbagels keytool -genkey \\
+    -keystore $android_keystore \\
+    -alias $android_keyalias \\
+    -storepass:env ANDROID_KEYSTORE_PASS \\
+    -keypass:env ANDROID_KEYSTORE_PASS \\
+    -dname CN=bagels
+
+Then try again with:
+
+  ANDROID_KEYSTORE_PASS=bagelsbagels $0
+
+Naturally, replace bagelsbagels with an appropriate password.
+HELP
+		exit 1
+	fi
+	>&2 echo "[+] adb installing android/$app_exe.apk"
+	if ! $adb install android/$app_exe.apk; then
+		>&2 echo "[-]   failed"
+		return 1
+	fi
+}
+
 function check_debuggable() {
 	$adb shell run-as $app_id whoami >/dev/null
 }
@@ -173,6 +216,7 @@ LLDB_INIT
 
 check_env
 check_adb
+maybe_install_app
 check_debuggable
 maybe_kill_previous_lldb_server
 maybe_undo_previous_adb_forward

android/install-apk.py

@@ -23,6 +23,3 @@ if subprocess.run([
 	apk_path,
 ]).returncode:
 	sys.exit(1)
-
-with open(phony_path, 'w') as _:
-	pass