lilyball / nix-env.fish

Nix environment setup for the fish shell

nix-env.fish

Sets up the Nix environment for a non-NixOS Fish shell.

Beyond just setting up $PATH and the various $NIX_* environment variables, this also sets up $fish_function_path and $fish_complete_path to include any Nix-installed Fish functions/completions, and sources any Nix-installed Fish conf.d.

Install

Any Fish package manager should be able to install this.

Fisher

fisher install lilyball/nix-env.fish

Manual install

You can install this manually by copying or symlinking the conf.d/nix-env.fish file into your ~/.config/fish/conf.d/ folder.

nix-env.fish's Issues

breaks on fish 3.3.0

I get this error message:

set: Did you mean 'set PATH $PATH <....my whole path...>'?```
(the whole path is in semicolon form).
Latest nix-env installed from fisher 4.3.0, fish 3.3.0 from homebrew on MacOS 11.4

not working?

New to fish & nix (!!!) but couldn't get this to work:

peter@strix ~> fisher list
jorgebucaran/fisher
lilyball/nix-env.fish

peter@strix ~> ls -l .nix-profile/bin/
total 1772
-r-xr-xr-x 1 peter peter 1812696 Jan 1 1970 nix
lrwxrwxrwx 1 peter peter 3 Jan 1 1970 nix-build -> nix
lrwxrwxrwx 1 peter peter 3 Jan 1 1970 nix-channel -> nix
lrwxrwxrwx 1 peter peter 3 Jan 1 1970 nix-collect-garbage -> nix
lrwxrwxrwx 1 peter peter 3 Jan 1 1970 nix-copy-closure -> nix
lrwxrwxrwx 1 peter peter 3 Jan 1 1970 nix-daemon -> nix
lrwxrwxrwx 1 peter peter 3 Jan 1 1970 nix-env -> nix
lrwxrwxrwx 1 peter peter 3 Jan 1 1970 nix-hash -> nix
lrwxrwxrwx 1 peter peter 3 Jan 1 1970 nix-instantiate -> nix
lrwxrwxrwx 1 peter peter 3 Jan 1 1970 nix-prefetch-url -> nix
lrwxrwxrwx 1 peter peter 3 Jan 1 1970 nix-shell -> nix
lrwxrwxrwx 1 peter peter 3 Jan 1 1970 nix-store -> nix

peter@strix ~> echo $PATH
/bin /usr/local/sbin /usr/local/bin /usr/sbin /usr/bin /sbin /bin /usr/games /usr/local/games /snap/bin

peter@strix ~> ls -l .config/fish/conf.d/
total 8
-rw-rw-r-- 1 peter peter 6886 Apr 17 21:32 nix-env.fish

peter@strix ~> echo $SHELL
/usr/bin/fish
peter@strix ~>

peter@strix ~> fish --version
fish, version 3.2.2

nothing ends up in my $PATH and i'm unable to execute nix-shell 😢

Package in `nixpkgs`

It'd be great if this was available under nixpkgs#fishPlugins, given the use-case.

Sourcing home-manager env vars

Hi,

I just discovered your project today looking for options to manage my configs a bit more tightly with home-manager. It helped me solved a good portion of the issues I was solving with direnv, so thanks!
One thing that I'm looking at solving is sourcing /.nix-profile/etc/profile.d/hm-session-vars.sh which is generated by home-manager and contains bash style variables that are set and exported for the user when set in their (home-manager) config.

A small example:

home.sessionVariables = {
  BAT_THEME = "Dracula";
};

Would create a file /.nix-profile/etc/profile.d/hm-session-vars.sh with contents of:

# Only source this once.
if [ -n "$__HM_SESS_VARS_SOURCED" ]; then return; fi
export __HM_SESS_VARS_SOURCED=1

export BAT_THEME="Dracula"

Is it possible to enable that in this project or should I seek for help in home-manager?

Thanks!

PATH variable keeps growing in nested shells

Thank you for this plugin.

I've just noticed that in nested shells, the PATH variable continues to grow.

> set --show PATH | grep nix
$PATH[6]: |/Users/charego/.nix-profile/bin|
$PATH[7]: |/nix/var/nix/profiles/default/bin|

> exec fish
> set --show PATH | grep nix
$PATH[1]: |/Users/charego/.nix-profile/bin|
$PATH[2]: |/nix/var/nix/profiles/default/bin|
$PATH[14]: |/Users/charego/.nix-profile/bin|
$PATH[15]: |/nix/var/nix/profiles/default/bin|

> exec fish
> set --show PATH | grep nix
$PATH[1]: |/Users/charego/.nix-profile/bin|
$PATH[2]: |/nix/var/nix/profiles/default/bin|
$PATH[9]: |/Users/charego/.nix-profile/bin|
$PATH[10]: |/nix/var/nix/profiles/default/bin|
$PATH[16]: |/Users/charego/.nix-profile/bin|
$PATH[17]: |/nix/var/nix/profiles/default/bin|

I'm not sure if this should be considered a bug with nix-env.fish or with the script that nix-env.fish sources and replays. In my case, I'm running a multi-user install on MacOS and nix-env.fish is sourcing the nix-daemon.sh script.

Here is the relevant snippet from this plugin:

set -l nix_profile_path /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
...
# Source the nix setup script
# We're going to run the regular Nix profile under bash and then print out a few variables
for line in (command env -u BASH_ENV bash -c '. "$0"; for name in PATH "${!NIX_@}"; do printf "%s=%s\0" "$name" "${!name}"; done' $nix_profile_path | string split0)
  set -xg (string split -m 1 = $line)
end

Here is the relevant snippet from nix-daemon.sh:

# Only execute this file once per shell.
if [ -n "${__ETC_PROFILE_NIX_SOURCED:-}" ]; then return; fi
__ETC_PROFILE_NIX_SOURCED=1

export NIX_PROFILES="/nix/var/nix/profiles/default $HOME/.nix-profile"
...
export PATH="$HOME/.nix-profile/bin:/nix/var/nix/profiles/default/bin:$PATH"

I'm able to "fix" the problem by updating nix-daemon.sh to check for duplicates:

# Prepend profile binaries to PATH if not already present.
for i in $NIX_PROFILES; do
  if [ -d "$i/bin" ] && [[ ":$PATH:" != *":$i/bin:"* ]]; then
    export PATH="$i/bin${PATH:+":$PATH"}"
  fi
done

But notice the script already has its own guard at the top, which doesn't work for us. So should this be guarded against by nix-env.fish, or is it something we need to push upstream? Thanks!

Multiuser mode is always assumed

dffcee7 adds a check for whether to use daemon/multiuser mode by checking whether /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh exists. But that always triggers, since nix-daemon.sh is a part of the nixpkgs.nix package, which is always installed for single-user installs:

 teo  ~  stat (nix path-info nixpkgs.nix)/etc/profile.d/nix-daemon.sh                                                                                                                                                
warning: Nix search path entry '/nix/var/nix/profiles/per-user/root/channels/nixpkgs' does not exist, ignoring
warning: Nix search path entry '/nix/var/nix/profiles/per-user/root/channels' does not exist, ignoring
  File: /nix/store/43822pavpsvlnx6cfph58pxnhndjnmdd-nix-2.3.6/etc/profile.d/nix-daemon.sh
  Size: 1334            Blocks: 8          IO Block: 4096   regular file
Device: 10303h/66307d   Inode: 16648927    Links: 1
Access: (0444/-r--r--r--)  Uid: ( 1000/     teo)   Gid: ( 1000/     teo)
Access: 2020-06-08 09:34:44.325693143 +0200
Modify: 1970-01-01 01:00:01.000000000 +0100
Change: 2020-06-08 09:33:37.459140843 +0200
 Birth: 2020-06-08 09:33:37.359135320 +0200

Multi User detection fails if ls is an alias

Hi there,

first of all, thank you very much for this great solution for running nix with fish.
I just came accross a little problem when installing through fisher on a multi-user environment.
In my case ls is an alias for exa which leads to line 26 not being able to detect whether or not /nix/store is owned by root.
A quick fix was to simply change ls to /bin/ls in my case.

Maybe you could add that for the future?

Have a nice day!

I could only manage to have the function on my path one time

And that was the first time I installed this. I can't get nix-shell or anything like that to run.
I installed exactly as outlined in the README. I wonder if I need to fiddle with some PATH.