2024-10-24 Executing commands via NNCP

In a network of connected nodes where you all exchanged public keys, it is possible to do file requests. For this to work, the node with the files needs to specify the directory with the files and the node wanting the files needs to use the `nncp-freq` command to do a file request.

But what file to request? One solution is for one side to create a file listing all the other files and make this filename known to friends. Then run a job to recreate the file on a regular basis.

But you know me. It sounds like CO₂ for the CO₂ god.

So here's the node that has the files, granting its neighbour melanobombus access to the files in `/home/alex/alexschroeder.ch/wiki` and offering to execute `ls -BR` for that directory and sending it back as a file called `files.txt`.

    melanobomus: {
      exec: {
        rsmtp:  ["/usr/sbin/sendmail", "-bS"]
        ls: ["/bin/sh", "-c", "ls --ignore-backups --recursive /home/alex/alexschroeder.ch/wiki | nncp-file - $NNCP_SENDER:files.txt"]
      }
      freq: {
        path: "/home/alex/alexschroeder.ch/wiki"
      }
      …
    }

​#NNCP