Even More Random Qubes OS Nonsense

2023-08-11 07:37:13Z (last updated 2023-08-11 07:37:13Z)

File compression. Yeah I'm doing that.

So my plan is:

1. Setup a Qube

2. Put files in it

3. Compress the files in the Qube

4. Get the compressed files

While this sounds simple, there are a few issues I had:

• I must transfer files wirelessly, since I don't have anymore external storage
• I need to use incoming connections, except I can't because Qubes OS networking is pain for incoming connections
• I need all the memory, but dom0 and sys-firewall takes up 4 gigabytes for no reason
• I would like to also install software to you know, compress

So the actual process look something more like this:

1. Create a template Qube based on something like Fedora

It's like creating any other Qube, but you're creating a TemplateVM instead. Don't mess with the network settings, keep it default.

2. Install the software I need in the template Qube

This requires starting the template VM and running the package manager for it. Use the package manager as normal, because Qubes OS already deals with the mess of installing packages in a template VM with no internet access.

After installing the packages, just shutdown the template VM.

3. Create a Qube with a lot of storage space and a lot of memory for compressing, while using my new shiny template Qube

This requires creating another Qube, but this time, with a template based on your new and shiny one.

4. Create an SSH key to login to my system

5. Pull the files from my computer with rsync over ssh

You can specify some SSH location thingy as a source, and a destination as your local directory. So you can pull files instead of pushing them (which is much more complicated because of incoming connections and whatever).

6. Create a swap file (just in case)

Using `fallocate`, I made a swap file with quite a bit of space, so that just in case I did need more swap, I would already have them.

7. Shutdown all other Qubes that take up lots of memory for no apparent reason

I don't understand why sys-firewall takes up 4 gigabytes of RAM, but it does, according to `xentop` in dom0.

I basically had to stop all the Qubes, remove network access to the compressor (so that it doesn't start the network and the 4 gigabytes of RAM firewall), and then I can continue.

8. Start compressing the files

This is pretty much the longest part of the process.

If you're interested in the specifics of the command, it's for you if you're trying to do things like compress many likely similar APK and OBB files for some reason:

7z a -t7z -m0=lzma2 -mx=3 -mfb=273 -md=1536m -ms=4g -mmt=off -mmtf=off -mps=on -bt -myx=9 -bb3 output.7z input_folder/