Carry a service script, and declare the backend as a component
ai-server is now something Dev Updater can install, start and stop from the phone: the project declares a Server component naming ./server/service, and that script is where knowing about systemd and OpenRC lives. Detection asks rather than looks -- `systemctl --user show-environment` answering, or `rc-service --user` existing -- because a machine can carry both binaries and an OpenRC below 0.60 has rc-service without --user. Neither present is an error with a message, not a guess at a fallback. Two things the script will not do. It never prompts: Dev Updater runs it with stdin closed, so a sudo prompt would hang rather than fail, and anything needing root exits telling you to run it yourself once. And on OpenRC it refuses when XDG_RUNTIME_DIR is unset rather than proceeding -- user services store their state there, and the failure otherwise reads as a broken service instead of a missing variable. The server is declared before the app so it is built and delivered first; a failed APK build then leaves the phone with the APK it already had rather than half of a matched pair. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01QQz6R4kBQcWSHBNZMgBnjL
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@@ -3,9 +3,19 @@
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label: "AI Sessions",
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// The server is built and delivered before the APK: if the APK build then
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// fails, the phone keeps being offered the one it already had rather than
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// half of a matched pair.
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components: [
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Server(
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name: "backend",
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build: "cargo build --release --manifest-path ../server/Cargo.toml",
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// Installs into whichever user-service manager is here, and is how
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// this server is started, stopped and asked about. See the script.
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service: "../server/service",
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),
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Apk(
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name: "app",
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build: "./build-apk.sh",
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),
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],
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]
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Executable
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@@ -0,0 +1,155 @@
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#!/bin/sh
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# Installs and controls ai-server as a user service, for Dev Updater to
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# drive from the phone -- and for you to drive by hand, which is the same
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# thing.
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#
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# ./service install | uninstall | start | stop | restart | status
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#
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# `status` prints exactly one of `running`, `stopped` or `not-installed`
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# and exits 0. Anything else it prints, or any non-zero exit, means it
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# could not tell -- which the card shows as "couldn't check" rather than
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# as a service that is down.
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#
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# Nothing here ever prompts. Dev Updater runs this with stdin closed and no
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# terminal, so a `sudo` password prompt would not fail, it would hang until
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# the timeout with the card stuck mid-action. Anything needing root exits
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# with a message telling you to run it yourself once instead.
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#
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# User services on purpose: a system unit needs root to install, and a
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# build machine's own account is where a dev server belongs.
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set -eu
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SCRIPT_DIR=$(cd "$(dirname "$0")" && pwd)
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NAME=ai-server
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BINARY="$SCRIPT_DIR/target/release/$NAME"
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# Which init system is here, decided by asking rather than by looking for a
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# binary: a machine can carry both, and an OpenRC older than 0.60 has
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# rc-service but no --user at all.
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detect() {
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if command -v systemctl >/dev/null 2>&1 &&
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systemctl --user show-environment >/dev/null 2>&1; then
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echo systemd
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elif command -v rc-service >/dev/null 2>&1 &&
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rc-service --user --help >/dev/null 2>&1; then
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echo openrc
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else
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echo none
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fi
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}
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MANAGER=$(detect)
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if [ "$MANAGER" = none ]; then
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echo "No user-service manager here: this needs systemd with a user bus," >&2
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echo "or OpenRC 0.60+ (older ones have no --user). Run $NAME by hand." >&2
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exit 1
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fi
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# OpenRC keeps user-service state under XDG_RUNTIME_DIR and refuses without
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# it. Worth saying plainly: from a server started outside a login session
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# it can be unset, and the failure otherwise reads as a broken service
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# rather than a missing variable.
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if [ "$MANAGER" = openrc ] && [ -z "${XDG_RUNTIME_DIR:-}" ]; then
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echo "XDG_RUNTIME_DIR is unset, and OpenRC stores user-service state in it." >&2
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echo "Set it at login (elogind or pam_xdg) and try again." >&2
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exit 1
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fi
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SYSTEMD_UNIT="${XDG_CONFIG_HOME:-$HOME/.config}/systemd/user/$NAME.service"
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OPENRC_UNIT="${XDG_CONFIG_HOME:-$HOME/.config}/rc/init.d/$NAME"
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installed() {
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case "$MANAGER" in
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systemd) [ -f "$SYSTEMD_UNIT" ] ;;
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openrc) [ -f "$OPENRC_UNIT" ] ;;
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esac
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}
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require_binary() {
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[ -x "$BINARY" ] && return 0
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echo "No built server at $BINARY -- build it first." >&2
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exit 1
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}
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do_install() {
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require_binary
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case "$MANAGER" in
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systemd)
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mkdir -p "$(dirname "$SYSTEMD_UNIT")"
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cat > "$SYSTEMD_UNIT" <<UNIT
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[Unit]
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Description=$NAME (installed by $SCRIPT_DIR/service)
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[Service]
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ExecStart=$BINARY
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Restart=on-failure
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WorkingDirectory=$SCRIPT_DIR
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[Install]
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WantedBy=default.target
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UNIT
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systemctl --user daemon-reload
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systemctl --user enable "$NAME" >/dev/null
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;;
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openrc)
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mkdir -p "$(dirname "$OPENRC_UNIT")"
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cat > "$OPENRC_UNIT" <<UNIT
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#!/sbin/openrc-run
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name="$NAME"
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description="$NAME (installed by $SCRIPT_DIR/service)"
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command="$BINARY"
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command_background=true
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directory="$SCRIPT_DIR"
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pidfile="\${XDG_RUNTIME_DIR}/$NAME.pid"
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UNIT
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chmod +x "$OPENRC_UNIT"
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rc-update --user add "$NAME" >/dev/null
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;;
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esac
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}
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do_uninstall() {
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installed || return 0
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case "$MANAGER" in
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systemd)
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systemctl --user disable --now "$NAME" >/dev/null 2>&1 || true
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rm -f "$SYSTEMD_UNIT"
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systemctl --user daemon-reload
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;;
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openrc)
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rc-service --user "$NAME" stop >/dev/null 2>&1 || true
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rc-update --user del "$NAME" >/dev/null 2>&1 || true
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rm -f "$OPENRC_UNIT"
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;;
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esac
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}
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control() {
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installed || { echo "$NAME is not installed" >&2; exit 1; }
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case "$MANAGER" in
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systemd) systemctl --user "$1" "$NAME" ;;
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openrc) rc-service --user "$NAME" "$1" ;;
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esac
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}
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case "${1:-}" in
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install) do_install ;;
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uninstall) do_uninstall ;;
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start | stop | restart) control "$1" ;;
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status)
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if ! installed; then
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echo not-installed
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elif case "$MANAGER" in
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systemd) systemctl --user --quiet is-active "$NAME" ;;
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openrc) rc-service --user "$NAME" status >/dev/null 2>&1 ;;
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esac then
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echo running
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else
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echo stopped
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fi
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;;
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*)
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echo "usage: $0 install|uninstall|start|stop|restart|status" >&2
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exit 2
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;;
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esac
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