
The mutableUsers feature uses `chpasswd` to set users passwords. Passwords and their hashes were being piped into the program using double quotes ("") to escape. This causes any `$` characters to be expanded as shell variables. This is a serious problem because all the password hash methods besides DES use multiple `$` in the hashes. Single quotes ('') should be used instead to prevent shell variable expansion.
*** 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.