Add opt-in auto-update from Gitea releases

The program now lives in /usr/local/lib/bamboo and is owned by its service user so it can replace itself.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

.env.example

@@ -9,3 +9,7 @@ BAMBOO_TOKEN=
 
 # Folder for this agent's WireGuard key.
 #BAMBOO_DATA=./bamboo-data
+
+# Check for new releases every few hours and update and restart by itself (Linux and macOS).
+# setup.sh turns this on; remove it to update by hand.
+#BAMBOO_AUTO_UPDATE=1

README.md

@@ -48,6 +48,10 @@ sudo systemctl start bamboo
 
 Use `linux_arm64` or `linux_arm` for Raspberry Pi and other ARM machines. To upgrade, repeat the same steps: your settings and data are kept. `sudo ./install.sh --uninstall` removes the service and binary but leaves `/etc/bamboo` and `/var/lib/bamboo` alone. `bamboo -version` tells you which build is running.
 
+**Updates**
+
+Set `BAMBOO_AUTO_UPDATE=1` (or pass `-auto-update`) and Bamboo checks this server for a newer release every few hours, verifies it against `SHA256SUMS`, checks that the new binary runs, swaps it in and restarts itself. It only follows full releases (never pre-releases), never downgrades, and keeps the old binary if anything looks wrong. `setup.sh` turns it on. It is not available on Windows, and it is for the systemd and plain-binary installs: with Docker, pull a new image instead.
+
 **With Docker**
 
 ```

cmd/bamboo/main.go

@@ -11,6 +11,7 @@ import (
 
 	"git.veillax.com/Veillax/bamboo"
 	"git.veillax.com/Veillax/reef/dotenv"
+	"git.veillax.com/Veillax/reef/selfupdate"
 )
 
 // version is set at build time (deploy/build.sh).
@@ -34,6 +35,7 @@ func main() {
 	data := flag.String("data", env("BAMBOO_DATA", "./bamboo-data"), "directory for this agent's WireGuard key")
 	dockerOn := flag.Bool("docker", os.Getenv("BAMBOO_DOCKER") == "1", "report local Docker containers so they can be picked as targets in the UI")
 	flag.String("env", ".env", "file to read secrets and settings from")
+	autoUpdate := flag.Bool("auto-update", os.Getenv("BAMBOO_AUTO_UPDATE") == "1", "check for new releases every few hours and update and restart by itself (Linux and macOS)")
 	showVersion := flag.Bool("version", false, "print the version and exit")
 	flag.Parse()
 	if *showVersion {
@@ -47,6 +49,9 @@ func main() {
 	log.Printf("bamboo %s starting", version)
 	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt)
 	defer stop()
+	if *autoUpdate {
+		go selfupdate.Run(ctx, selfupdate.Config{Server: "https://git.veillax.com", Repo: "Veillax/bamboo", App: "bamboo", Current: version, Logf: log.Printf})
+	}
 	b, err := bamboo.New(bamboo.Config{Hammerhead: strings.TrimRight(*hh, "/"), Token: *token, DataDir: *data, Docker: *dockerOn})
 	if err != nil {
 		log.Fatal(err)

deploy/bamboo.service

@@ -8,7 +8,7 @@ Wants=network-online.target
 User=bamboo
 Group=bamboo
 EnvironmentFile=-/etc/bamboo/bamboo.env
-ExecStart=/usr/local/bin/bamboo -data /var/lib/bamboo
+ExecStart=/usr/local/lib/bamboo/bamboo -data /var/lib/bamboo
 WorkingDirectory=/var/lib/bamboo
 Restart=on-failure
 RestartSec=3
@@ -16,7 +16,7 @@ RestartSec=3
 # It makes outbound connections only, so it needs no privileges at all.
 NoNewPrivileges=true
 ProtectSystem=strict
-ReadWritePaths=/var/lib/bamboo
+ReadWritePaths=/var/lib/bamboo /usr/local/lib/bamboo
 ProtectHome=true
 PrivateTmp=true
 ProtectKernelTunables=true

deploy/install.sh

@@ -5,7 +5,7 @@
 #   sudo ./install.sh --start      the same, then start (or restart) the service
 #   sudo ./install.sh --uninstall  remove the service and binary (keeps the settings and data)
 #
-# Files: /usr/local/bin/bamboo, /etc/systemd/system/bamboo.service,
+# Files: /usr/local/lib/bamboo/bamboo (linked from /usr/local/bin/bamboo), /etc/systemd/system/bamboo.service,
 #        /etc/bamboo/bamboo.env (your settings and secrets), /var/lib/bamboo (data).
 # Set DESTDIR=/some/dir to stage everything there without touching the system.
 set -eu
@@ -17,6 +17,7 @@ UNIT=$ROOT/etc/systemd/system/$NAME.service
 CONF=$ROOT/etc/$NAME
 ENVFILE=$CONF/$NAME.env
 DATA=$ROOT/var/lib/$NAME
+LIB=$ROOT/usr/local/lib/$NAME # the program lives here, owned by the service, so auto-update can replace it
 
 say() { printf '%s\n' "$*"; }
 real() { [ -z "${DESTDIR:-}" ]; } # are we touching the real system?
@@ -30,7 +31,7 @@ if [ "${1:-}" = "--uninstall" ]; then
 	if real; then
 		systemctl disable --now "$NAME" > /dev/null 2>&1 || true
 	fi
-	rm -f "$UNIT" "$BIN"
+	rm -f "$UNIT" "$BIN" "$LIB/$NAME"
 	if real; then
 		systemctl daemon-reload || true
 	fi
@@ -46,15 +47,18 @@ if real && ! id "$NAME" > /dev/null 2>&1; then
 fi
 
 mkdir -p "$ROOT/usr/local/bin" "$ROOT/etc/systemd/system" "$CONF" "$DATA"
-install -m 0755 "$HERE/$NAME" "$BIN.new"
+mkdir -p "$LIB"
-mv -f "$BIN.new" "$BIN" # atomic, so upgrading a running service is safe
+install -m 0755 "$HERE/$NAME" "$LIB/$NAME.new"
+mv -f "$LIB/$NAME.new" "$LIB/$NAME" # atomic, so upgrading a running service is safe
+rm -f "$BIN"
+ln -s "/usr/local/lib/$NAME/$NAME" "$BIN"
 install -m 0644 "$HERE/$NAME.service" "$UNIT"
 if [ ! -f "$ENVFILE" ]; then
 	install -m 0600 "$HERE/.env.example" "$ENVFILE"
 	say "Created $ENVFILE. Edit it before starting."
 fi
 if real; then
-	chown -R "$NAME:$NAME" "$DATA"
+	chown -R "$NAME:$NAME" "$DATA" "$LIB"
 fi
 
 if real; then
@@ -66,7 +70,7 @@ if real; then
 	fi
 fi
 
-say "Installed $("$BIN" -version 2> /dev/null || echo "$NAME")."
+say "Installed $("$LIB/$NAME" -version 2> /dev/null || echo "$NAME")."
 say "Next:"
 say "  1. edit $ENVFILE"
 say "  2. systemctl start $NAME      (or run this again with --start)"

go.mod

@@ -2,7 +2,7 @@ module git.veillax.com/Veillax/bamboo
 
 go 1.27.3
 
-require git.veillax.com/Veillax/reef v0.1.0
+require git.veillax.com/Veillax/reef v0.1.3
 
 require (
 	github.com/Microsoft/go-winio v0.6.4 // indirect

go.sum

@@ -1,5 +1,7 @@
 git.veillax.com/Veillax/reef v0.1.0 h1:O0OhEKFx2CsvACJ20sfzJNjGsngomtfDdKdxu4ROpCs=
 git.veillax.com/Veillax/reef v0.1.0/go.mod h1:ZBUd/BARO5kkpUNTP81TTY1aQXLHFR6bKDhCxckjHso=
+git.veillax.com/Veillax/reef v0.1.3 h1:RxSq2xwaup1+MieAkhlvOTZnYwPf19thFHEAe/7VxsI=
+git.veillax.com/Veillax/reef v0.1.3/go.mod h1:ZBUd/BARO5kkpUNTP81TTY1aQXLHFR6bKDhCxckjHso=
 github.com/Microsoft/go-winio v0.6.4 h1:kJF2pamtYCWXf0xAT8sAkwKC0pMl2HYBrRPHAqyUc+g=
 github.com/Microsoft/go-winio v0.6.4/go.mod h1:1xl5JXG4ze/m74GH6Dc4Mwxfc3VL5siRVQjIAlHH07U=
 github.com/google/btree v1.1.2 h1:xf4v41cLI2Z6FxbKm+8Bu+m8ifhj15JuZ9sa0jZCMUU=