nixpkgs-suyu/nixos/modules/config/shells-environment.nix

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# This module defines a global environment configuration and
# a common configuration for all shells.
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.environment;
exportedEnvVars =
let
absoluteVariables =
mapAttrs (n: toList) cfg.variables;
suffixedVariables =
flip mapAttrs cfg.profileRelativeEnvVars (envVar: listSuffixes:
concatMap (profile: map (suffix: "${profile}${suffix}") listSuffixes) cfg.profiles
);
allVariables =
zipAttrsWith (n: concatLists) [ absoluteVariables suffixedVariables ];
exportVariables =
mapAttrsToList (n: v: ''export ${n}="${concatStringsSep ":" v}"'') allVariables;
in
concatStringsSep "\n" exportVariables;
in
{
options = {
environment.variables = mkOption {
default = {};
description = ''
A set of environment variables used in the global environment.
These variables will be set on shell initialisation.
The value of each variable can be either a string or a list of
strings. The latter is concatenated, interspersed with colon
characters.
'';
type = types.attrsOf (mkOptionType {
name = "a string or a list of strings";
merge = loc: defs:
let
defs' = filterOverrides defs;
res = (head defs').value;
in
if isList res then concatLists (getValues defs')
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else if lessThan 1 (length defs') then
throw "The option `${showOption loc}' is defined multiple times, in ${showFiles (getFiles defs)}."
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else if !isString res then
throw "The option `${showOption loc}' does not have a string value, in ${showFiles (getFiles defs)}."
else res;
});
apply = mapAttrs (n: v: if isList v then concatStringsSep ":" v else v);
};
environment.profiles = mkOption {
default = [];
description = ''
A list of profiles used to setup the global environment.
'';
type = types.listOf types.string;
};
environment.profileRelativeEnvVars = mkOption {
type = types.attrsOf (types.listOf types.str);
example = { PATH = [ "/bin" "/sbin" ]; MANPATH = [ "/man" "/share/man" ]; };
description = ''
Attribute set of environment variable. Each attribute maps to a list
of relative paths. Each relative path is appended to the each profile
of <option>environment.profiles</option> to form the content of the
corresponding environment variable.
'';
};
# !!! isn't there a better way?
environment.extraInit = mkOption {
default = "";
description = ''
Shell script code called during global environment initialisation
after all variables and profileVariables have been set.
This code is asumed to be shell-independent, which means you should
stick to pure sh without sh word split.
'';
type = types.lines;
};
environment.shellInit = mkOption {
default = "";
description = ''
Shell script code called during shell initialisation.
This code is asumed to be shell-independent, which means you should
stick to pure sh without sh word split.
'';
type = types.lines;
};
environment.loginShellInit = mkOption {
default = "";
description = ''
Shell script code called during login shell initialisation.
This code is asumed to be shell-independent, which means you should
stick to pure sh without sh word split.
'';
type = types.lines;
};
environment.interactiveShellInit = mkOption {
default = "";
description = ''
Shell script code called during interactive shell initialisation.
This code is asumed to be shell-independent, which means you should
stick to pure sh without sh word split.
'';
type = types.lines;
};
environment.shellAliases = mkOption {
default = {};
example = { ll = "ls -l"; };
description = ''
An attribute set that maps aliases (the top level attribute names in
this option) to command strings or directly to build outputs. The
aliases are added to all users' shells.
'';
type = types.attrs; # types.attrsOf types.stringOrPath;
};
environment.binsh = mkOption {
default = "${config.system.build.binsh}/bin/sh";
example = literalExample ''
"''${pkgs.dash}/bin/dash"
'';
type = types.path;
description = ''
The shell executable that is linked system-wide to
<literal>/bin/sh</literal>. Please note that NixOS assumes all
over the place that shell to be Bash, so override the default
setting only if you know exactly what you're doing.
'';
};
environment.shells = mkOption {
default = [];
example = [ "/run/current-system/sw/bin/zsh" ];
description = ''
A list of permissible login shells for user accounts.
No need to mention <literal>/bin/sh</literal>
here, it is placed into this list implicitly.
'';
type = types.listOf types.path;
};
};
config = {
system.build.binsh = pkgs.bashInteractive;
# Set session variables in the shell as well. This is usually
# unnecessary, but it allows changes to session variables to take
# effect without restarting the session (e.g. by opening a new
# terminal instead of logging out of X11).
environment.variables = config.environment.sessionVariables;
environment.etc."shells".text =
''
${concatStringsSep "\n" cfg.shells}
/bin/sh
'';
system.build.setEnvironment = pkgs.writeText "set-environment"
''
${exportedEnvVars}
${cfg.extraInit}
# The setuid wrappers override other bin directories.
export PATH="${config.security.wrapperDir}:$PATH"
# ~/bin if it exists overrides other bin directories.
export PATH="$HOME/bin:$PATH"
'';
system.activationScripts.binsh = stringAfter [ "stdio" ]
''
# Create the required /bin/sh symlink; otherwise lots of things
# (notably the system() function) won't work.
mkdir -m 0755 -p /bin
ln -sfn "${cfg.binsh}" /bin/.sh.tmp
mv /bin/.sh.tmp /bin/sh # atomically replace /bin/sh
'';
};
}