Add Systemd install script (run as service in Linux) (#4258)

* Add Systemd install script (run as service in Linux)

* Add User and WorkingDirectory

README.md

@@ -353,6 +353,14 @@ If you want to run it with a user without a /home directory you need to add `Env
 
 Mono must be compiled with the Roslyn compiler (default), using MCS will cause "An error has occurred." errors (See https://github.com/Jackett/Jackett/issues/2704).
 
+### Install as service
+1. Install Jackett with the steps from above.
+2. Open the Terminal and run `sudo ./install_service_systemd.sh` You need root permissions to install the service.
+2. If the installation was a success, you can close the Terminal window.
+
+The service will start on each logon. You can always stop it by running `systemctl stop jackett.service` from Terminal. You can start it again it using `systemctl start jackett.service`.
+Logs are stored as usual under `~/.config/Jackett/log.txt` and also in `journalctl -u jackett.service`.
+
 ### Installation on Linux via Ansible
 
 On a RHEL/Centos 7 system: [linuxhq.jackett](https://galaxy.ansible.com/linuxhq/jackett)

install_service_systemd.sh

@@ -0,0 +1,79 @@
+#!/bin/bash
+
+#Setting up colors
+BOLDRED="$(printf '\033[1;31m')"
+BOLDGREEN="$(printf '\033[1;32m')"
+NC="$(printf '\033[0m')" # No Color
+
+# Stop and unload the service if it's running
+jackettservice="jackett.service"
+systemctl stop ${jackettservice}
+
+# Move working directory to Jackett's
+cd "$(dirname "$0")"
+
+# Check if we're running from Jackett's directory
+if [ ! -f ./JackettConsole.exe ]; then
+echo "${BOLDRED}ERROR${NC}: Couldn't locate JackettConsole.exe. Is the script in the right directory?"
+    exit 1
+fi
+jackettdir="$(pwd)"
+
+# Check if Jackett's owner is root
+jackettuser="$(stat -c "%U" ./JackettConsole.exe)"
+if [ "${jackettuser}" == "root" ]; then
+echo "${BOLDRED}ERROR${NC}: Jackett shouldn't run as root. Please, change the owner of the Jackett directory."
+    exit 1
+fi
+
+# Check if mono is installed
+command -v mono >/dev/null 2>&1 || { echo >&2 "${BOLDRED}ERROR${NC}: Jackett requires Mono but it's not installed. Aborting."; exit 1; }
+monodir="$(dirname $(command -v mono))"
+
+# Check that no other service called Jackett is already running
+if [[ $(systemctl status ${jackettservice} | grep "active (running)") ]]; then
+    echo "${BOLDRED}ERROR${NC}: Jackett already seems to be running as a service. Please stop it before running this script again."
+    exit 1
+fi
+
+# Write the systemd service descriptor
+cat >"/etc/systemd/system/${jackettservice}" <<EOL
+[Unit]
+Description=Jackett Daemon
+After=network.target
+
+[Service]
+SyslogIdentifier=jackett
+Restart=always
+RestartSec=5
+Type=simple
+User=${jackettuser}
+Group=${jackettuser}
+WorkingDirectory=${jackettdir}
+ExecStart=${monodir}/mono --debug ${jackettdir}/JackettConsole.exe --NoRestart
+TimeoutStopSec=20
+
+[Install]
+WantedBy=multi-user.target
+
+EOL
+
+# Reload systemd daemon
+systemctl daemon-reload
+
+# Run the service
+systemctl start ${jackettservice}
+
+# Check that it's running
+if [[ $(systemctl status ${jackettservice} | grep "active (running)") ]]; then
+    echo "${BOLDGREEN}Agent successfully installed and launched!${NC}"
+else
+    cat << EOL
+${BOLDRED}ERROR${NC}: Could not launch service. The installation might have failed.
+Please open an issue on https://github.com/Jackett/Jackett/issues and paste following information:
+Mono directory: \`${monodir}\`
+Jackett directory: \`${jackettdir}\`
+Jackett user: \`${jackettuser}\`
+
+EOL
+fi