Revert "nixVersions.stable: 2.18.1 -> 2.19.2"

This version does not pass our NixOS tests, e.g. `nixosTests.misc` and
potentially other fundamental tests such as lib-tests.

Changed files
+6 -6
nixos
modules
installer
pkgs
tools
package-management
+5 -5
nixos/modules/installer/tools/nix-fallback-paths.nix
···
{
-
x86_64-linux = "/nix/store/smfmnz0ylx80wkbqbjibj7zcw4q668xp-nix-2.19.2";
-
i686-linux = "/nix/store/knp0akbpj2k0rf26fmysmxdysmayihax-nix-2.19.2";
-
aarch64-linux = "/nix/store/761hq0abn07nrydrf6mls61bscx2vz2i-nix-2.19.2";
-
x86_64-darwin = "/nix/store/zlqvxis1dfcfgmy5fza4hllg6h03vhpb-nix-2.19.2";
-
aarch64-darwin = "/nix/store/53r8ay20mygy2sifn7j2p8wjqlx2kxik-nix-2.19.2";
+
x86_64-linux = "/nix/store/azvn85cras6xv4z5j85fiy406f24r1q0-nix-2.18.1";
+
i686-linux = "/nix/store/9bnwy7f9h0kzdzmcnjjsjg0aak5waj40-nix-2.18.1";
+
aarch64-linux = "/nix/store/hh65xwqm9s040s3cgn9vzcmrxj0sf5ij-nix-2.18.1";
+
x86_64-darwin = "/nix/store/6zi5fqzn9n17wrk8r41rhdw4j7jqqsi3-nix-2.18.1";
+
aarch64-darwin = "/nix/store/0pbq6wzr2f1jgpn5212knyxpwmkjgjah-nix-2.18.1";
}
+1 -1
pkgs/tools/package-management/nix/default.nix
···
else
nix;
-
stable = addFallbackPathsCheck self.nix_2_19;
+
stable = addFallbackPathsCheck self.nix_2_18;
unstable = self.nix_2_19;
} // lib.optionalAttrs config.allowAliases {