Merge pull request #312169 from B4dM4n/remove-alias-usage

treewide: Remove usage of pkgs.{system,hostPlatform} aliases

nixos/modules/system/boot/binfmt.nix

···
   };
 
   config = {
-    boot.binfmt.registrations = builtins.listToAttrs (map (system: assert system != pkgs.system; {
+    boot.binfmt.registrations = builtins.listToAttrs (map (system: assert system != pkgs.stdenv.hostPlatform.system; {
       name = system;
       value = { config, ... }: let
         interpreter = getEmulator system;

nixos/modules/virtualisation/lxc-image-metadata.nix

···
       contents = [
         {
           source = toYAML "metadata.yaml" {
-            architecture = builtins.elemAt (builtins.match "^([a-z0-9_]+).+" (toString pkgs.system)) 0;
+            architecture = builtins.elemAt (builtins.match "^([a-z0-9_]+).+" (toString pkgs.stdenv.hostPlatform.system)) 0;
             creation_date = 1;
             properties = {
-              description = "${config.system.nixos.distroName} ${config.system.nixos.codeName} ${config.system.nixos.label} ${pkgs.system}";
+              description = "${config.system.nixos.distroName} ${config.system.nixos.codeName} ${config.system.nixos.label} ${pkgs.stdenv.hostPlatform.system}";
               os = "${config.system.nixos.distroId}";
               release = "${config.system.nixos.codeName}";
             };

nixos/modules/virtualisation/qemu-vm.nix

···
           "ppc64-linux" = "tpm-spapr";
           "armv7-linux" = "tpm-tis-device";
           "aarch64-linux" = "tpm-tis-device";
-        }.${pkgs.hostPlatform.system} or (throw "Unsupported system for TPM2 emulation in QEMU"));
+        }.${pkgs.stdenv.hostPlatform.system} or (throw "Unsupported system for TPM2 emulation in QEMU"));
         defaultText = ''
           Based on the guest platform Linux system:
 

nixos/tests/stub-ld.nix

···
           ${if32 "machine.succeed('test -L /${libDir32}/${ldsoBasename32}')"}
 
       with subtest("Try FHS executable"):
-          machine.copy_from_host('${test-exec.${pkgs.system}}','test-exec')
+          machine.copy_from_host('${test-exec.${pkgs.stdenv.hostPlatform.system}}','test-exec')
           machine.succeed('if test-exec/${exec-name} 2>outfile; then false; else [ $? -eq 127 ];fi')
           machine.succeed('grep -qi nixos outfile')
-          ${if32 "machine.copy_from_host('${test-exec.${pkgs32.system}}','test-exec32')"}
+          ${if32 "machine.copy_from_host('${test-exec.${pkgs32.stdenv.hostPlatform.system}}','test-exec32')"}
           ${if32 "machine.succeed('if test-exec32/${exec-name} 2>outfile32; then false; else [ $? -eq 127 ];fi')"}
           ${if32 "machine.succeed('grep -qi nixos outfile32')"}