release/dist/synology: build synology packages with cmd/dist

Updates #8217

Signed-off-by: David Anderson <danderson@tailscale.com>

release/dist/synology/files/scripts/postupgrade

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+exit 0

release/dist/synology/files/scripts/preupgrade

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+exit 0

release/dist/synology/files/scripts/start-stop-status

@@ -0,0 +1,129 @@
+#!/bin/bash
+
+SERVICE_NAME="tailscale"
+
+if [ "${SYNOPKG_DSM_VERSION_MAJOR}" -eq "6" ]; then
+    PKGVAR="/var/packages/Tailscale/etc"
+else
+    PKGVAR="${SYNOPKG_PKGVAR}"
+fi
+
+PID_FILE="${PKGVAR}/tailscaled.pid"
+LOG_FILE="${PKGVAR}/tailscaled.stdout.log"
+STATE_FILE="${PKGVAR}/tailscaled.state"
+SOCKET_FILE="${PKGVAR}/tailscaled.sock"
+PORT="41641"
+
+SERVICE_COMMAND="${SYNOPKG_PKGDEST}/bin/tailscaled \
+--state=${STATE_FILE} \
+--socket=${SOCKET_FILE} \
+--port=$PORT"
+
+if [ "${SYNOPKG_DSM_VERSION_MAJOR}" -eq "7" -a ! -e "/dev/net/tun" ]; then
+    # TODO(maisem/crawshaw): Disable the tun device in DSM7 for now.
+    SERVICE_COMMAND="${SERVICE_COMMAND} --tun=userspace-networking"
+fi
+
+if [ "${SYNOPKG_DSM_VERSION_MAJOR}" -eq "6" ]; then
+    chown -R tailscale:tailscale "${PKGVAR}/"
+fi
+
+start_daemon() {
+    local ts=$(date --iso-8601=second)
+    echo "${ts} Starting ${SERVICE_NAME} with: ${SERVICE_COMMAND}" >${LOG_FILE}
+    STATE_DIRECTORY=${PKGVAR} ${SERVICE_COMMAND} 2>&1 | sed -u '1,200p;201s,.*,[further tailscaled logs suppressed],p;d' >>${LOG_FILE} &
+    # We pipe tailscaled's output to sed, so "$!" retrieves the PID of sed not tailscaled.
+    # Use jobs -p to retrieve the PID of the most recent process group leader.
+    jobs -p >"${PID_FILE}"
+}
+
+stop_daemon() {
+    if [ -r "${PID_FILE}" ]; then
+        local PID=$(cat "${PID_FILE}")
+        local ts=$(date --iso-8601=second)
+        echo "${ts} Stopping ${SERVICE_NAME} service PID=${PID}" >>${LOG_FILE}
+        kill -TERM $PID >>${LOG_FILE} 2>&1
+        wait_for_status 1 || kill -KILL $PID >>${LOG_FILE} 2>&1
+        rm -f "${PID_FILE}" >/dev/null
+    fi
+}
+
+daemon_status() {
+    if [ -r "${PID_FILE}" ]; then
+        local PID=$(cat "${PID_FILE}")
+        if ps -o pid -p ${PID} > /dev/null; then
+            return
+        fi
+        rm -f "${PID_FILE}" >/dev/null
+    fi
+    return 1
+}
+
+wait_for_status() {
+    # 20 tries
+    # sleeps for 1 second after each try
+    local counter=20
+    while [ ${counter} -gt 0 ]; do
+        daemon_status
+        [ $? -eq $1 ] && return
+        counter=$((counter - 1))
+        sleep 1
+    done
+    return 1
+}
+
+ensure_tun_created() {
+    if [ "${SYNOPKG_DSM_VERSION_MAJOR}" -eq "7" ]; then
+        # TODO(maisem/crawshaw): Disable the tun device in DSM7 for now.
+        return
+    fi
+    # Create the necessary file structure for /dev/net/tun
+    if ([ ! -c /dev/net/tun ]); then
+        if ([ ! -d /dev/net ]); then
+            mkdir -m 755 /dev/net
+        fi
+        mknod /dev/net/tun c 10 200
+        chmod 0755 /dev/net/tun
+    fi
+
+    # Load the tun module if not already loaded
+    if (!(lsmod | grep -q "^tun\s")); then
+        insmod /lib/modules/tun.ko
+    fi
+}
+
+case $1 in
+start)
+    if daemon_status; then
+        exit 0
+    else
+        ensure_tun_created
+        start_daemon
+        exit $?
+    fi
+    ;;
+stop)
+    if daemon_status; then
+        stop_daemon
+        exit $?
+    else
+        exit 0
+    fi
+    ;;
+status)
+    if daemon_status; then
+        echo "${SERVICE_NAME} is running"
+        exit 0
+    else
+        echo "${SERVICE_NAME} is not running"
+        exit 3
+    fi
+    ;;
+log)
+    exit 0
+    ;;
+*)
+    echo "command $1 is not implemented"
+    exit 0
+    ;;
+esac