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:PROPERTIES:
:ID: 3c67e623-c269-4c9b-9bdf-4ad677d46a35
:END:
#+title : systemd environment directives
#+date : 2021-08-07 19:58:29 +08:00
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#+date_modified : 2022-04-16 20:19:15 +08:00
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#+language : en
systemd enables setting the environment through environment directives.
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For some, this is a nice shell-agnostic way of setting environment variables and could replace setting through shell profiles (i.e., =.bashrc= , =.profile= ).
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It needs a =*.conf= file in one of the load paths (seen from the =environment.d.5= manual page).
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Just like how [[id:c7edff80-6dea-47fc-8ecd-e43b5ab8fb1e ][systemd at user-level ]], you can set it at user-level by placing them in certain user-level load paths (e.g., =$XDG_CONFIG_HOME/environment.d= ).
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Keep in mind it does not use the shell directly and instead makes use of shell-like syntax.
The syntax takes variable substitutions and parameter expansion seen from [[id:dd9d3ffa-03ff-42a1-8c5d-55dc9fcc70fe ][GNU Bash ]].
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The following code block is an example of setting Nix-related environment variables to enable desktop integrations.
#+begin_src ini
# Enable desktop integration with Nix-installed applications.
NIX_PATH=$HOME/.nix-defexpr/channels${NIX_PATH:+:}$NIX_PATH
PATH=${PATH:+$PATH:}$HOME/.nix-profile/bin
XDG_DATA_DIRS=${XDG_DATA_DIRS:+$XDG_DATA_DIRS:}$HOME/.nix-profile/share/
#+end_src
