153 lines
4.2 KiB
Nix
153 lines
4.2 KiB
Nix
# This module defines global configuration for the Bash shell, in
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# particular /etc/bashrc and /etc/profile.
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{ config, pkgs, ... }:
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with pkgs.lib;
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let
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cfg = config.environment;
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initBashCompletion = optionalString cfg.enableBashCompletion ''
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# Check whether we're running a version of Bash that has support for
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# programmable completion. If we do, enable all modules installed in
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# the system (and user profile).
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if shopt -q progcomp &>/dev/null; then
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. "${pkgs.bashCompletion}/etc/profile.d/bash_completion.sh"
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nullglobStatus=$(shopt -p nullglob)
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shopt -s nullglob
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for p in $NIX_PROFILES; do
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for m in "$p/etc/bash_completion.d/"* "$p/share/bash-completion/completions/"*; do
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. $m
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done
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done
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eval "$nullglobStatus"
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unset nullglobStatus p m
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fi
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'';
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shellAliases = concatStringsSep "\n" (
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mapAttrsFlatten (k: v: "alias ${k}='${v}'") cfg.shellAliases
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);
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options = {
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environment.promptInit = mkOption {
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default = ''
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# Provide a nice prompt.
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PROMPT_COLOR="1;31m"
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let $UID && PROMPT_COLOR="1;32m"
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PS1="\n\[\033[$PROMPT_COLOR\][\u@\h:\w]\\$\[\033[0m\] "
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if test "$TERM" = "xterm"; then
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PS1="\[\033]2;\h:\u:\w\007\]$PS1"
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fi
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'';
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description = ''
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Shell script code used to initialise the shell prompt.
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'';
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type = with pkgs.lib.types; string;
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};
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environment.shellInit = mkOption {
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default = "";
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example = ''export PATH=/godi/bin/:$PATH'';
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description = ''
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Shell script code called during login shell initialisation.
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'';
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type = with pkgs.lib.types; string;
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};
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environment.interactiveShellInit = mkOption {
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default = "";
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example = ''export PATH=/godi/bin/:$PATH'';
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description = ''
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Shell script code called during interactive shell initialisation.
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'';
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type = with pkgs.lib.types; string;
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};
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environment.enableBashCompletion = mkOption {
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default = false;
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description = "Enable Bash completion for all interactive shells.";
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type = with pkgs.lib.types; bool;
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};
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environment.binsh = mkOption {
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default = "${config.system.build.binsh}/bin/sh";
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example = "\${pkgs.dash}/bin/dash";
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type = with pkgs.lib.types; path;
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description = ''
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Select the shell executable that is linked system-wide to
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<literal>/bin/sh</literal>. Please note that NixOS assumes all
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over the place that shell to be Bash, so override the default
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setting only if you know exactly what you're doing.
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'';
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};
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};
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in
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{
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require = [options];
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environment.etc =
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[ { # Script executed when the shell starts as a login shell.
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source = pkgs.substituteAll {
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src = ./profile.sh;
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wrapperDir = config.security.wrapperDir;
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inherit (cfg) shellInit;
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};
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target = "profile";
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}
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{ # /etc/bashrc: executed every time a bash starts. Sources
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# /etc/profile to ensure that the system environment is
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# configured properly.
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source = pkgs.substituteAll {
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src = ./bashrc.sh;
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inherit (cfg) interactiveShellInit;
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};
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target = "bashrc";
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}
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{ # Configuration for readline in bash.
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source = ./inputrc;
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target = "inputrc";
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}
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];
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environment.shellAliases =
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{ ls = "ls --color=tty";
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ll = "ls -l";
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l = "ls -alh";
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which = "type -P";
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};
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environment.interactiveShellInit =
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''
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# Check the window size after every command.
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shopt -s checkwinsize
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${cfg.promptInit}
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${initBashCompletion}
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${shellAliases}
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'';
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system.build.binsh = pkgs.bashInteractive;
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system.activationScripts.binsh = stringAfter [ "stdio" ]
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''
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# Create the required /bin/sh symlink; otherwise lots of things
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# (notably the system() function) won't work.
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mkdir -m 0755 -p /bin
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ln -sfn "${cfg.binsh}" /bin/.sh.tmp
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mv /bin/.sh.tmp /bin/sh # atomically replace /bin/sh
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'';
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environment.pathsToLink = optionals cfg.enableBashCompletion [
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"/etc/bash_completion.d"
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"/share/bash-completion"
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];
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}
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