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home-environment: describe session variable trickyness

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Robert Helgesson
2018-01-04 11:59:58 +01:00
parent 8ab6298f30
commit 33af9948e5
1 changed files with 19 additions and 0 deletions
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modules/home-environment.nix
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@@ -127,6 +127,25 @@ in
example = { EDITOR = "emacs"; GS_OPTIONS = "-sPAPERSIZE=a4"; };
description = ''
Environment variables to always set at login.
</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>
home.sessionVariables = {
FOO = "Hello";
BAR = "$FOO World!";
};
</programlisting>
may not work as expected. If you need to reference another
session variable, then do so inside Nix instead. The above
example then becomes
<programlisting>
home.sessionVariables = {
FOO = "Hello";
BAR = "''${config.home.sessionVariables.FOO} World!";
};
</programlisting>
'';
};