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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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9
modules/environment/login/login-inner.nix
View file

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

85
modules/environment/session-init.nix
View file

@ -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, ... }:
@ -49,41 +49,54 @@ in
options = {
environment.sessionVariables = mkOption {
default = { };
type = types.attrs;
example = { EDITOR = "emacs"; GS_OPTIONS = "-sPAPERSIZE=a4"; };
description = ''
Environment variables to always set at login.
</para><para>
The values may refer to other environment variables using
POSIX.2 style variable references. For example, a variable
<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>''${parameter:-foo}</code> and, similarly, an alternate
value <literal>bar</literal> can be given as per
<code>''${parameter:+bar}</code>.
</para><para>
Note, these variables may be set in any order so no session
variable may have a runtime dependency on another session
variable. In particular code like
<programlisting language="nix">
environment.sessionVariables = {
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>
'';
environment = {
motd = mkOption {
default = ''
Welcome to Nix-on-Droid!
If nothing works, open an issue at https://github.com/t184256/nix-on-droid/issues or try the rescue shell.
'';
type = types.nullOr types.lines;
description = ''
Text to show on every new shell created by nix-on-droid.
'';
};
sessionVariables = mkOption {
default = { };
type = types.attrs;
example = { EDITOR = "emacs"; GS_OPTIONS = "-sPAPERSIZE=a4"; };
description = ''
Environment variables to always set at login.
</para><para>
The values may refer to other environment variables using
POSIX.2 style variable references. For example, a variable
<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>''${parameter:-foo}</code> and, similarly, an alternate
value <literal>bar</literal> can be given as per
<code>''${parameter:+bar}</code>.
</para><para>
Note, these variables may be set in any order so no session
variable may have a runtime dependency on another session
variable. In particular code like
<programlisting language="nix">
environment.sessionVariables = {
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>
'';
};
};
};