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What happens if I push all of nixpkgs
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Nix
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566# Global configuration for freetds environment.
{ config, lib, pkgs, ...}:
let
cfg = config.environment.freetds;
in{ ###### interface
options = {
environment.freetds = lib.mkOption { type = lib.types.attrsOf lib.types.str; default = { }; example = lib.literalExpression '' { MYDATABASE = ''' host = 10.0.2.100 port = 1433 tds version = 7.2 '''; } ''; description = '' Configure freetds database entries. Each attribute denotes a section within freetds.conf, and the value (a string) is the config content for that section. When at least one entry is configured the global environment variables FREETDSCONF, FREETDS and SYBASE will be configured to allow the programs that use freetds to find the library and config. '';
};
};
###### implementation
config = lib.mkIf (builtins.length (builtins.attrNames cfg) > 0) {
environment.variables.FREETDSCONF = "/etc/freetds.conf"; environment.variables.FREETDS = "/etc/freetds.conf"; environment.variables.SYBASE = "${pkgs.freetds}";
environment.etc."freetds.conf" = { text = ( lib.concatStrings ( lib.mapAttrsToList (name: value: '' [${name}] ${value} '') cfg ) ); };
};
}