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environment.motd: add option

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This commit is contained in:
Tobias Happ 2022-11-05 22:30:52 +01:00
parent a99c1e0416
commit ffac515cfb
3 changed files with 56 additions and 40 deletions
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2
CHANGELOG.md
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@ -19,6 +19,8 @@
* In an effort to reduce the number of arguments to `lib.nixOnDroidConfiguration` * In an effort to reduce the number of arguments to `lib.nixOnDroidConfiguration`
function in flake configurations, `system` is now inferred from `pkgs.system` function in flake configurations, `system` is now inferred from `pkgs.system`
and `config` and `extraModules` are now combined into `modules` and `config` and `extraModules` are now combined into `modules`
* Add option `environment.motd` to edit the startup message that is printed in
every shell
## Release 22.05 ## Release 22.05

9
modules/environment/login/login-inner.nix
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@ -13,10 +13,11 @@ writeText "login-inner" ''
set -eo pipefail set -eo pipefail
if [ "$#" -eq 0 ]; then # if script is called from within nix-on-droid app ${lib.optionalString (config.environment.motd != null) ''
echo "Welcome to Nix-on-Droid!" if [ "$#" -eq 0 ]; then # if script is called from within nix-on-droid app
echo "If nothing works, open an issue at https://github.com/t184256/nix-on-droid/issues or try the rescue shell." echo "${lib.removeSuffix "\n" config.environment.motd}"
fi fi
''}
${lib.optionalString config.build.initialBuild '' ${lib.optionalString config.build.initialBuild ''
if [ -e /etc/UNINTIALISED ]; then if [ -e /etc/UNINTIALISED ]; then

85
modules/environment/session-init.nix
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@ -1,4 +1,4 @@
# Copyright (c) 2019-2020, see AUTHORS. Licensed under MIT License, see LICENSE. # Copyright (c) 2019-2022, see AUTHORS. Licensed under MIT License, see LICENSE.
{ config, lib, pkgs, ... }: { config, lib, pkgs, ... }:
@ -49,41 +49,54 @@ in
options = { options = {
environment.sessionVariables = mkOption { environment = {
default = { }; motd = mkOption {
type = types.attrs; default = ''
example = { EDITOR = "emacs"; GS_OPTIONS = "-sPAPERSIZE=a4"; }; Welcome to Nix-on-Droid!
description = '' If nothing works, open an issue at https://github.com/t184256/nix-on-droid/issues or try the rescue shell.
Environment variables to always set at login. '';
</para><para> type = types.nullOr types.lines;
The values may refer to other environment variables using description = ''
POSIX.2 style variable references. For example, a variable Text to show on every new shell created by nix-on-droid.
<varname>parameter</varname> may be referenced as '';
<code>$parameter</code> or <code>''${parameter}</code>. A };
default value <literal>foo</literal> may be given as per
<code>''${parameter:-foo}</code> and, similarly, an alternate sessionVariables = mkOption {
value <literal>bar</literal> can be given as per default = { };
<code>''${parameter:+bar}</code>. type = types.attrs;
</para><para> example = { EDITOR = "emacs"; GS_OPTIONS = "-sPAPERSIZE=a4"; };
Note, these variables may be set in any order so no session description = ''
variable may have a runtime dependency on another session Environment variables to always set at login.
variable. In particular code like </para><para>
<programlisting language="nix"> The values may refer to other environment variables using
environment.sessionVariables = { POSIX.2 style variable references. For example, a variable
FOO = "Hello"; <varname>parameter</varname> may be referenced as
BAR = "$FOO World!"; <code>$parameter</code> or <code>''${parameter}</code>. A
}; default value <literal>foo</literal> may be given as per
</programlisting> <code>''${parameter:-foo}</code> and, similarly, an alternate
may not work as expected. If you need to reference another value <literal>bar</literal> can be given as per
session variable, then do so inside Nix instead. The above <code>''${parameter:+bar}</code>.
example then becomes </para><para>
<programlisting language="nix"> Note, these variables may be set in any order so no session
environment.sessionVariables = { variable may have a runtime dependency on another session
FOO = "Hello"; variable. In particular code like
BAR = "''${config.environment.sessionVariables.FOO} World!"; <programlisting language="nix">
}; environment.sessionVariables = {
</programlisting> FOO = "Hello";
''; BAR = "$FOO World!";
};
</programlisting>
may not work as expected. If you need to reference another
session variable, then do so inside Nix instead. The above
example then becomes
<programlisting language="nix">
environment.sessionVariables = {
FOO = "Hello";
BAR = "''${config.environment.sessionVariables.FOO} World!";
};
</programlisting>
'';
};
}; };
}; };