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# This module defines a global environment configuration and
# a common configuration for all shells.
{ config, pkgs, ... }:
with pkgs.lib;
let
cfg = config.environment;
in
{
options = {
environment.variables = mkOption {
default = {};
description = ''
A set of environment variables used in the global environment.
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 = xs:
let xs' = evalProperties xs; in
if isList (head xs') then concatLists xs'
else if builtins.lessThan 1 (length xs') then abort "variable in environment.variables has multiple values"
else if !builtins.isString (head xs') then abort "variable in environment.variables does not have a string value"
else head xs';
});
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.profileVariables = mkOption {
default = (p: {});
description = ''
A function which given a profile path should give back
a set of environment variables for that profile.
'';
# !!! this should be of the following type:
#type = types.functionTo (types.attrsOf (types.optionSet envVar));
# and envVar should be changed to something more like environOpts.
# Having unique `value' _or_ multiple `list' is much more useful
# than just sticking everything together with ':' unconditionally.
# Anyway, to have this type mentioned above
# types.optionSet needs to be transformed into a type constructor
# (it has a !!! mark on that in nixpkgs)
# for now we hack all this to be
type = types.functionTo (types.attrsOf (types.listOf types.string));
};
# !!! 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 = "\${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;
environment.etc."shells".text =
''
${concatStringsSep "\n" cfg.shells}
/bin/sh
'';
system.build.setEnvironment = pkgs.writeText "set-environment"
''
${concatStringsSep "\n" (
(mapAttrsToList (n: v: ''export ${n}="${concatStringsSep ":" v}"'')
# This line is a kind of a hack because of !!! note above
(zipAttrsWith (const concatLists) ([ (mapAttrs (n: v: [ v ]) cfg.variables) ] ++ map cfg.profileVariables cfg.profiles))))}
${cfg.extraInit}
# The setuid wrappers override other bin directories.
export PATH="${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
'';
};
}