install.sh: support update mode; auto-restart if service was active

- Detect fresh install vs update via systemctl is-enabled
- On update: pip install --upgrade picks up new dependency versions
- If service was active before running the script, restart it automatically
- Summary message adapts to install vs update context

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

install.sh

@@ -1,16 +1,15 @@
 #!/usr/bin/env bash
-# Install we_monitor as a systemd user service.
+# Install or update we_monitor as a systemd user service.
 #
-# What this script does:
-#   1. Creates ~/.config/we_monitor/ and a credentials template if missing
-#   2. Writes a systemd user service unit
-#   3. Enables the service (does not start it — edit credentials first)
-#
-# Usage:
+# Fresh install:
 #   chmod +x install.sh
 #   ./install.sh
 #   # then edit ~/.config/we_monitor/credentials.json
 #   systemctl --user start we_monitor
+#
+# Update (code already pulled via git):
+#   ./install.sh
+#   (restarts the service automatically if it was running)
 
 set -euo pipefail
 
@@ -25,7 +24,21 @@ LOG_DIR="$SCRIPT_DIR/logs"
 VENV="$SCRIPT_DIR/.venv"
 PYTHON="$VENV/bin/python"
 
-echo "==> we_monitor installer"
+# detect fresh install vs update
+IS_UPDATE=false
+WAS_ACTIVE=false
+if systemctl --user is-enabled "$SERVICE_NAME" &>/dev/null; then
+    IS_UPDATE=true
+    if systemctl --user is-active "$SERVICE_NAME" &>/dev/null; then
+        WAS_ACTIVE=true
+    fi
+fi
+
+if $IS_UPDATE; then
+    echo "==> we_monitor updater"
+else
+    echo "==> we_monitor installer"
+fi
 echo "    Project : $SCRIPT_DIR"
 echo "    User    : $USER"
 echo ""
@@ -40,11 +53,11 @@ fi
 
 echo "==> Installing / updating dependencies"
 "$VENV/bin/pip" install --quiet --upgrade pip
-"$VENV/bin/pip" install --quiet -r "$SCRIPT_DIR/requirements.txt"
+"$VENV/bin/pip" install --quiet --upgrade -r "$SCRIPT_DIR/requirements.txt"
 echo "    Python  : $PYTHON"
 echo ""
 
-# ── 2. credentials template ───────────────────────────────────────────────────
+# ── 2. credentials template (only on fresh install) ───────────────────────────
 mkdir -p "$CREDS_DIR"
 chmod 700 "$CREDS_DIR"
 
@@ -108,24 +121,37 @@ else
     echo "    Run as root to fix: loginctl enable-linger $USER"
 fi
 
-# ── 6. reload and enable (but do NOT start yet) ───────────────────────────────
+# ── 6. reload systemd and enable / restart ────────────────────────────────────
 systemctl --user daemon-reload
 systemctl --user enable "$SERVICE_NAME"
 
+if $WAS_ACTIVE; then
+    systemctl --user restart "$SERVICE_NAME"
+    echo "==> Service restarted"
+fi
+
 echo ""
 echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
-echo " Installation complete."
+if $IS_UPDATE; then
+    echo " Update complete."
+    echo ""
+    if $WAS_ACTIVE; then
+        echo " Service was restarted automatically."
+    else
+        echo " Service was not running — start it manually if needed:"
+        echo "        systemctl --user start $SERVICE_NAME"
+    fi
+else
+    echo " Installation complete."
+    echo ""
+    echo " Next steps:"
+    echo "   1. Edit credentials (username, password, vin, interval_s, …):"
+    echo "        \$EDITOR $CREDS_FILE"
+    echo ""
+    echo "   2. Start the service:"
+    echo "        systemctl --user start $SERVICE_NAME"
+fi
 echo ""
-echo " Next steps:"
-echo "   1. Edit credentials (username, password, vin, interval_s, …):"
-echo "        \$EDITOR $CREDS_FILE"
-echo ""
-echo "   2. Start the service:"
-echo "        systemctl --user start $SERVICE_NAME"
-echo ""
-echo "   3. Check status:"
-echo "        systemctl --user status $SERVICE_NAME"
-echo ""
-echo "   4. Follow logs:"
-echo "        journalctl --user -u $SERVICE_NAME -f"
+echo "   Check status : systemctl --user status $SERVICE_NAME"
+echo "   Follow logs  : journalctl --user -u $SERVICE_NAME -f"
 echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"