feat: Multi-Instanz-Support via systemd Template-Unit (v0.2.0)

- pdf-ocr-hotfolder@<name>.service mit Config pro Instanz
- install.sh als Instanz-Manager: erkennt bestehende, fragt nach weiteren
- Optional eigener Service-User pro Instanz (systemd drop-in)
- update.sh stoppt/startet alle aktiven Instanzen automatisch

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

update.sh

@@ -2,6 +2,10 @@
 #
 # PDF OCR Hotfolder — Update-Script
 #
+# Aktualisiert Code und venv unter /opt/pdf-ocr-hotfolder/ sowie die
+# systemd Template-Unit. Danach werden alle laufenden Instanzen neu gestartet.
+# Config-Dateien unter /etc/pdf-ocr-hotfolder/ bleiben unverändert.
+#
 set -euo pipefail
 
 RED='\033[0;31m'; GREEN='\033[0;32m'; YELLOW='\033[1;33m'; NC='\033[0m'
@@ -15,7 +19,8 @@ if [ "${EUID}" -ne 0 ]; then
 fi
 
 INSTALL_DIR="/opt/pdf-ocr-hotfolder"
-SERVICE_NAME="pdf-ocr-hotfolder"
+CONFIG_DIR="/etc/pdf-ocr-hotfolder"
+SERVICE_TEMPLATE="pdf-ocr-hotfolder@.service"
 
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 if [ -f "$SCRIPT_DIR/pdf_ocr_hotfolder/__init__.py" ]; then
@@ -42,12 +47,18 @@ log_info "Install: $INSTALL_DIR"
 log_info "Version: $OLD_VERSION → $NEW_VERSION"
 echo
 
-# Service-User aus systemd-Unit lesen
-SERVICE_USER="$(awk -F= '/^User=/{print $2}' /etc/systemd/system/${SERVICE_NAME}.service 2>/dev/null || echo pdfocr)"
-SERVICE_GROUP="$(awk -F= '/^Group=/{print $2}' /etc/systemd/system/${SERVICE_NAME}.service 2>/dev/null || echo pdfocr)"
+# Laufende Instanzen ermitteln
+mapfile -t RUNNING < <(systemctl list-units --no-legend --state=active 'pdf-ocr-hotfolder@*.service' 2>/dev/null | awk '{print $1}')
+if [ "${#RUNNING[@]}" -gt 0 ]; then
+    log_info "Laufende Instanzen: ${RUNNING[*]}"
+else
+    log_info "Keine laufenden Instanzen."
+fi
 
-log_info "Stoppe Service..."
-systemctl stop "${SERVICE_NAME}.service" 2>/dev/null || true
+log_info "Stoppe laufende Instanzen..."
+for unit in "${RUNNING[@]}"; do
+    systemctl stop "$unit" || true
+done
 
 log_info "Backup erstellen..."
 BACKUP_DIR="/var/backups/pdf-ocr-hotfolder"
@@ -60,29 +71,40 @@ rm -rf "$INSTALL_DIR/pdf_ocr_hotfolder"
 cp -r "$REPO_DIR/pdf_ocr_hotfolder" "$INSTALL_DIR/"
 cp "$REPO_DIR/requirements.txt" "$INSTALL_DIR/"
 cp "$REPO_DIR/VERSION" "$INSTALL_DIR/"
+cp "$REPO_DIR/config.example.toml" "$INSTALL_DIR/"
 echo "$REPO_DIR" > "$INSTALL_DIR/.repo_path"
 
 log_info "Dependencies aktualisieren..."
 "$INSTALL_DIR/venv/bin/pip" install --upgrade pip -q
 "$INSTALL_DIR/venv/bin/pip" install --upgrade -r "$INSTALL_DIR/requirements.txt" -q
 
-log_info "systemd-Unit aktualisieren..."
-sed -e "s|__SERVICE_USER__|$SERVICE_USER|g" \
-    -e "s|__SERVICE_GROUP__|$SERVICE_GROUP|g" \
-    "$REPO_DIR/systemd/pdf-ocr-hotfolder.service" \
-    > "/etc/systemd/system/${SERVICE_NAME}.service"
+log_info "systemd Template-Unit aktualisieren..."
+cp "$REPO_DIR/systemd/$SERVICE_TEMPLATE" "/etc/systemd/system/$SERVICE_TEMPLATE"
 systemctl daemon-reload
 
 log_info "Berechtigungen setzen..."
-chown -R "$SERVICE_USER:$SERVICE_GROUP" "$INSTALL_DIR"
+# Eigentümer des Codes bleibt der primäre User (pdfocr); Instanzen laufen
+# ggf. als anderer User, lesen aber nur den Code.
+PRIMARY_USER="$(stat -c '%U' "$INSTALL_DIR/venv" 2>/dev/null || echo pdfocr)"
+chown -R "$PRIMARY_USER":"$PRIMARY_USER" "$INSTALL_DIR"
 
-log_info "Service starten..."
-systemctl start "${SERVICE_NAME}.service"
-sleep 2
+log_info "Starte Instanzen wieder..."
+FAIL=0
+for unit in "${RUNNING[@]}"; do
+    systemctl start "$unit" || true
+    sleep 1
+    if systemctl is-active --quiet "$unit"; then
+        log_info "  ✅ $unit"
+    else
+        log_error "  ❌ $unit — journalctl -u $unit -n 30"
+        FAIL=1
+    fi
+done
 
-if systemctl is-active --quiet "${SERVICE_NAME}.service"; then
-    log_info "✅ Service läuft (Version $NEW_VERSION)"
+echo
+if [ "$FAIL" -eq 0 ]; then
+    log_info "Update auf $NEW_VERSION abgeschlossen ✓"
 else
-    log_error "Service läuft nicht. journalctl -u $SERVICE_NAME -n 30"
+    log_warn "Update abgeschlossen, aber mindestens eine Instanz läuft nicht."
     exit 1
 fi