home.sessionVariables

Environment variables to always set at login.

The values may refer to other environment variables using POSIX.2 style variable references. For example, a variable parameter may be referenced as $parameter or ${parameter}. A default value foo may be given as per ${parameter:-foo} and, similarly, an alternate value bar can be given as per ${parameter:+bar}.

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

home.sessionVariables = {
  FOO = "Hello";
  BAR = "$FOO World!";
};

may not work as expected. If you need to reference another session variable, then do so inside Nix instead. The above example then becomes

home.sessionVariables = {
  FOO = "Hello";
  BAR = "${config.home.sessionVariables.FOO} World!";
};