nix | Rust friendly bindings to * nix APIs

I'm pretty new to python and tkinter so I'm struggling with creating a script that reads the terminal output into a label or Gui in tkinter. I've searched around and can't find any tutorials on how to do it, a lot of forums have specific or old code which makes it really difficult to adapt especially for a beginner. The code that I found that looks like it will work best for what I'm trying to accomplish was made by jfs, the only problem is that I keep getting errors which for the life of me I cant figure out.

Here is the code:

I followed the 7th Nix pill tutorial, and created a derivation that placed an executable in the nix store, i.e. /nix/store/gh66mkic4c1dys8ag8yqnv10x59b7vmh-simple/simple.

I can run that executable, either directly or via symlinks to it. However, how do I remove it? I tried deleting old generations with $ nix-env --delete-generations old, and also garbage collecting with nix-store --gc, but my derivation's output still appears at that path and can be run there.

Now that I've completed the tutorial, how do I get rid of what I've created in the nix store? Does nixos ever clean up such old derivations? Does it need to be somehow marked as irrelevant before running the delete-old-generations or garbage-collect commands?

When I write a file using PHP,

Update: I got this working but am still not 100% sure why. I've appended the fully and consistently working script to the end for reference.

I'm trying to script a series of disk partition commands using sgdisk and mkfs.vfat. I'm working from a Live USB (NixOS 21pre), have a blank 1TB M.2 SSD, and am creating a 1GB EFI boot partition, and a 999GB ZFS partition.

Everything works up until I try to create a FAT32 filesystem on the EFI partition, using mkfs.vfat, where I get the error in the title.

However, the odd thing is, the mkfs.vfat command succeeds, but throws that error anyway and blocks the rest of the script. Any idea why it's doing this and how to fix it?

Starting with an unformatted 1TB M.2 SSD:

I am trying to reduce size of an archive containing Nix derivations. I noticed that every module has 3 files hi, p_hi and dyn_hi all similar size.

ghc (hint) interpreter requires only hi and if I remove rest variations nothing happens.

So are p_hi and dyn_hi kind of sand bags?

I haven't found any info about handling temporary files in Nix derivations.

I found $TMP and $TMPDIR env vars, but they both point just to /tmp, which is system global.

I'm trying to use nix flakes for android development.

This is my flake.nix:

I would like to produce an HTML / JS page with reflex-dom (only client side, frontend). However, I use the singletons package (2.6) and it seems that it cannot be compiled with ghcjs or ghc 8.6.5 (singletons 2.5.1, broken-unpatched). Therefore, the reflex-platform solutions, reflex-stone or equivalent did not help me.

I saw that ghcjs 8.8 or 8.10 could be installed through haskell.nix, but I did not find how.

How can I do it? Or maybe, is there a way to use GHCJS (or reflex-platform solutions) with recent packages (that need ghc 8.8 or +)? Is there a way to use ghcjs-8.8 or 8.10 with the reflex-platform?

I would like to write my nixos-configuration and home-manager-configuration files in a way that they work on both NixOs (linux) and MacOs (darwin).

While some things are configured the same way on both systems (eg git) other only make sense on one of them (like wayland-windowmanagers being only a thing on linux).

Nix-language features if-else-statements, so now all I need is a way to find out what kind of system I am on.

What I am after is something like: