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  • hottari@lemmy.ml
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    1 year ago

    Not possible to start or enable a created service without user intervention. You don’t know what you are talking about.

    • Ferk@kbin.social
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      1 year ago

      Systemd “enabled” services are literal symlinks… whenever a target runs, it tries to start also all the service files on its “wants” directory.

      You can literally enable any service for next boot by making a symlink in /etc/systemd/system/multi-user.target.wants/ (or whichever other target you want it to run on) as root (and installation scripts are run as root).

      ln -s /usr/lib/systemd/system/whatever.service  /etc/systemd/system/multi-user.target.wants/whatever.service
      
      
      • hottari@lemmy.ml
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        1 year ago

        This is actually very close (just tested and confirmed it). I somehow stand corrected about requiring manual enablement but this is just using the package manager to do the dirty work for you.

        However the program itself cannot write into those directories without root permissions. You still have to allow your package manager to do this with root permissions as mentioned.

    • calm.like.a.bomb@lemmy.dbzer0.com
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      1 year ago

      OK… challenge accepted. Maybe you don’t know about systemd user services.

      Content of mytrojan.sh:

      #!/usr/bin/env bash
      
      echo "Writing the service unit file"
      
      cat > ~/.config/systemd/user/my_test_service.service << EOF
      [Unit]
      Description=Script Daemon For Test User Services
      
      [Service]
      Type=simple
      User=
      #Group=
      ExecStart=/home/user/bin/myscript.sh
      Restart=on-failure
      StandardOutput=file:%h/log_file
      
      [Install]
      WantedBy=default.target
      EOF
      
      echo "Reloading systemd for the user"
      systemctl --user daemon-reload || exit 1
      
      echo "Enabling and starting the service"
      systemctl --user enable --now my_test_service.service
      

      Content of myscript.sh:

      $ cat ~/bin/myscript.sh
      #!/usr/bin/env bash
      
      while true
      do
          now=$(date)
          me=$(whoami)
          echo "User $me at $now"
          sleep 10
      done
      

      Now run the script (mytrojan.sh) and check service status after that:

      $ ./mytrojan.sh
      Writing the service unit file
      Reloading systemd for the user
      Enabling and starting the service
      $ systemctl --user status my_test_service.service
      ● my_test_service.service - Script Daemon For Test User Services
           Loaded: loaded (/home/user/.config/systemd/user/my_test_service.service; enabled; vendor preset: ena>
           Active: active (running) since Thu 2023-10-19 12:15:21 EEST; 6s ago
         Main PID: 1666383 (myscript.sh)
            Tasks: 2 (limit: 18757)
           Memory: 556.0K
              CPU: 4ms
           CGroup: /user.slice/user-1000.slice/user@1000.service/app.slice/my_test_service.service
                   ├─1666383 /bin/bash /home/user/bin/myscript.sh
                   └─1666387 sleep 10
      
      Oct 19 12:15:21 tesla systemd[1866318]: Started Script Daemon For Test User Services