
The xsession script runs services that depend on a sane environment. Gpg-agent, for example, runs the program "pinentry-gtk-2" to obtain the password to unlock GnuPG and SSH keys. That program will display only gibberish unless $FONTCONFIG_FILE is configured properly. Instead of configuring these variables explicitly one by one, we just source /etc/profile, which contains the appropriate @shellInit@ code.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.
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