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trcc
I am trying to add a haskell package to shell.nix, but I can simply not figure out how. Should I use nix-env -f "" -iA haskellPackages.Allure?
trcc
This seems to add it more globally, which I am not interested in
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dhess
Anyone around who's running bird on NixOS?
infinisil
trcc: gist your shell.nix?
trcc
infinisil: Think I just solved it
trcc
ls
{^^}
[nixpkgs] @reardencode opened pull request #43269 → Add libudev, which Ledger Live app requires → https://git.io/fNUec
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pie__
how do i sed up rsync on a nixos machine so that i can rsync over ssh?
rprije
For some reason my nix-shell isn't showing me a different prompt. I've set my own bash prompt_command so that probably broke it. What environment variables can I key off to build an explicitly different prompt when in nix-shell?
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clever
IN_NIX_SHELL=impure
rprije
thanks!
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rotaerk
bisecting nixpkgs, so tiresome
srk
how come
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rotaerk
because I end up needing to test nixpkgs commits that aren't fully in the binary cache
trcc
What is the purpose of running things inside the nix-shell instead of the terminal (using on mac)?
rotaerk
so I end up building GHC or GCC from scratch
rotaerk
trcc, nix-shell sets up your environment as specified in your shell.nix
rotaerk
for instance, you can set it up such that all your development tools are available within it
rotaerk
and all the libraries you depend on are available
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trcc
rotaerk: thank you. Howeer, within the shell I am invoking cabal build. And this seems to use the regular cabal. I do not even have to add e.g. a haskell module to the shell.nix file
trcc
it is enough to have it in the cabal file
clever
rotaerk: i once did a bisect like that, and ran into all kinds of trouble
trcc
is that because it is using a general envrionment?
clever
rotaerk: it turns out, anything not in the cache worked, and anything in the cache failed, so the bisect just failed to locate the problem entirely
rotaerk
hah
{^_^}
[nixpkgs] @NeQuissimus pushed to master « linux: 4.18-rc3 -> 4.18-rc4 »: https://git.io/fNUvd
clever
rotaerk: the problem was that the nix sandbox broke the package, and i had the sandbox off at the time
rotaerk
nice
clever
the package was testing for things like /etc/mtab, to detect what your distro is doing
clever
the nix sandbox had none of the options
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clever
so it hard-coded itself to open the path "unknown" at runtime
rotaerk
fortunately, I don't think I'm in a situation like that
rotaerk
I just get impatient waiting for each build
rotaerk
trcc, well, if you have cabal installed in your general environment, it will be accessible to nix-shell (well, by default; I think there's a way to hide it?)
rotaerk
but if you want a reproducible development environment that doesn't depend on what you have installed globally...
rotaerk
nix-shell is useful for that
rotaerk
heck you can have different nix-shell environments side-by-side, each with different versions of cabal accessible to tthem
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trcc
I am mainly interested in the a reproducable environment for the haskell packages. Not so much cabal
rotaerk
trcc, you mean, you want an environment in which a particular set of haskell packages, of specific versions, are accessible for building with cabal?
trcc
yes
rotaerk
yep, that's something you can setup with nix-shell
rotaerk
that's what I'm doing
trcc
do you have any repo publicly available?
rotaerk
I do, but it's not implemented in the simplest possible way, so might not be the best to learn from
rotaerk
but I'll link it...
trcc
the official docs just presents a general environment, that adds cabal and ghc to user profile (https://nixos.org/nixpkgs/manual/#how-to-create-a-development-environment)
rotaerk
https://github.com/rotaerk/vulkanTest
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rotaerk
let me know if you have any questions about it
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trcc
Thank you rotaerk.
trcc
I probably will later on
trcc
What is the process of creating a new project? Cause now I did cabal init, and then created shell.nix from cabal init. But this leaves me with a global cabal and global packages
rotaerk
"created shell.nix from cabal init"? how
trcc
cabal2nix
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trcc
the cabal file genereated from cabal init
rotaerk
oh k
trcc
But this seems to be the wrong way around
rotaerk
well, all of my nix files were written manually. cabal2nix is something that I call dynamically from within them
rotaerk
rather than storing the cabal2nix result itself in my source
rotaerk
https://github.com/Rotaerk/vulkanTest/blob/master/vulkanTest.nix#L40
rotaerk
there
trcc
ahh
trcc
where do you specify your cabal version?
rotaerk
note that the main folder contains nothing nix-related; it's just a haskell project
rotaerk
well, the general approach I take is to pick a version of nixpkgs as a foundation and reference that specific version (as opposed to using , which relies on whatever version I happen to have installed)
rotaerk
and then I apply overrides on top of that
02:27 rotaerk
i don't currently override the cabal version, so I'm using whatever version comes with this version of nixpkgs
trcc
okay. Thank you. I am trying to set up my project using nix for the frist time. So the development environment is being set up.. takes a bit of time
rotaerk
it's got a learning curve