Nixos installation

[musicformellons]

I see some instructions how to install on Nixos but both manual and using home-manager seem to be 'in development' AFAICT. What is the best way to install currently on Nixos and what features am I missing out on?

[akinomyoga]

I think the description of the manual installation works. It says ToDo: Fix blesh-share, but I think it was related to the discussion about what blesh-share should print (e.g. in NixOS/nixpkgs#181963 (comment)), but it's already fixed.

On the other hand, I think the installation with Home Manager doesn't work now because it's not yet merged upstream (as it references nix-community/home-manager#3238).

[akinomyoga]

@aiotter Do you have additional comments?

[aiotter]

You're right. Home-manager is a preferred way because blesh.sh stores configuration data in per-user basis, however, it is not merged yet because I have been extremely busy nowadays moving to a new residence.

[aiotter]

fyr, my .bashrc is like:

[[ $- == *i* ]] && source '/nix/store/jyry6zvchsspidk3ci9gqy0a9r6is4dn-blesh-0.4.0-devel3/share/blesh/ble.sh' --attach=none '--rcfile=/nix/store/qav8qcsii44r7k138dw5v85lw24083zd-blerc'

...

source /nix/store/7w9vbh9iwxllw9jarz3141vlifc23klj-bash-preexec-0.5.0/share/bash/bash-preexec.sh
[[ ${BLE_VERSION-} ]] && ble-attach

[akinomyoga]

Thanks for the information!

[musicformellons]

Thanks for your quick reply! I have:

  systemd.services.create-bashrc = {
    enable = true;
    description = "Create .bashrc file";
    script = ''
      set -e
      mkdir -p /home/${my.username}
      cat > /home/${my.username}/.bashrc << 'EOF'
      source "$(blesh-share)"/ble.sh --attach=none # does not work currently
      eval "$(atuin init bash)"
      export EDITOR=vim
      set -o vi
      [[ "''${BLE_VERSION-}" ]] && ble-attach
      EOF
      chown ${my.username}:users /home/${my.username}/.bashrc
    '';
    serviceConfig = {
      Type = "oneshot";
      RemainAfterExit = "yes";
    };
  };

in my configuration.nix.
In general ble.sh works as should, just one thing.
On opening a new shell I get:

ble.sh: XDG_RUNTIME_DIR='/run/user/501' is not a directory.
bleopt: option `keymap_vi_mode_string_nmap' not found
ble.sh: XDG_RUNTIME_DIR='/run/user/501' is not a directory.
bleopt: option `keymap_vi_mode_string_nmap' not found

before i get the normal prompt. BTW: No idea whether relevant, but I have xdg-utils installed and also direnv and nix-direnv.
I tried to set that normal mode indicator by having ~/.blerc with:

# in blehook keymap_vi_load
bleopt keymap_vi_mode_string_nmap=$'\e[1m-- NORMAL --\e[m'

It's not picked up as in normal mode I still get '~' instead of '-- NORMAL __'.

[musicformellons]

Oh..., after sudo nixos-rebuild switch the ble.sh: XDG_RUNTIME_DIR='/run/user/501' is not a directory. returns...

[musicformellons]

When adding the suggested lines to ~/.blerc I get:

bash: declare: BLE_SESSION: not found

[akinomyoga]

Ah, sorry. It is my typo. Could you try the following?

# blerc

declare -p BLE_SESSION_ID >&2
ble-stackdump >&2

[musicformellons]

declare -- BLE_SESSION_ID="1710738954.006495/2835"
declare -- BLE_SESSION_ID="1710738954.006495/2835"

[akinomyoga]

Thanks! It means that ~/.bashrc is sourced in the same session (but not in a temporary session).

Hmm, ble-stackdump is not enabled. Could you try the following?

# blerc

declare -p BLE_SESSION_ID >&2
bleopt internal_stackdump_enabled=1
ble-stackdump >&2

[kaBeech]

Oh! I actually added to the Wiki about this last night without noticing this discussion. Here's what works for me. Note that I use Flake notation throughout, though it will probably also work without Flakes:

NixOS

# configuration.nix
{pkgs, ...}: {
  environment.systemPackages = with pkgs; [
    blesh
  ];
}

Note that I didn't use the programs.bash.blesh.enable strategy in configuration.nix because when I tried that it didn't add blesh-share to my PATH and I didn't feel like troubleshooting that at the moment.

blesh package provides blesh-share executable, which echoes the directory path in which ble.sh is installed.
You can use it to configure ble.sh in your ~/.bashrc.

# ~/.bashrc
source "$(blesh-share)"/ble.sh --attach=none # does not work currently (this comment was here when I arrived and, for Chesterton's fence reasons, I have not removed it. I have not noticed anything not working)
...
[[ ! ${BLE_VERSION-} ]] || ble-attach

Home Manager

# home.nix
{pkgs, ...}: {
  home.packages = with pkgs; [
    blesh
  ];
  programs.bash = {
    enable = true;
    bashrcExtra = ''
      [[ $- == *i* ]] && source "$(blesh-share)"/ble.sh --noattach
      ...
      [[ ! ${BLE_VERSION-} ]] || ble-attach
    '';
  };
}

Hope this helps!

[Peter-Flynn]

I ended up rewriting the above home-manager solution, as it didn't work for me out-of-the-box. Posting here in case it helps someone else:

{ pkgs, lib, ... }:

{
  home.packages = with pkgs; [ blesh ];
  programs.bash = {
    enable = true;
    initExtra = lib.mkMerge [
      (lib.mkBefore ''
        [[ $- == *i* ]] && source "$(blesh-share)"/ble.sh --noattach
      '')
      (lib.mkAfter ''
        [[ ! ''\${BLE_VERSION-} ]] || ble-attach
      '')
    ];
  };
}