boot.initrd.luks.devices: Change into an attribute set

This allows setting options for the same LUKS device in different
modules. For example, the auto-generated hardware-configuration.nix
can contain

  boot.initrd.luks.devices.crypted.device = "/dev/disk/...";

while configuration.nix can add

  boot.initrd.luks.devices.crypted.allowDiscards = true;

Also updated the examples/docs to use /disk/disk/by-uuid instead of
/dev/sda, since we shouldn't promote the use of the latter.

1 files changed, 1 insertions, 2 deletions

diff --git a/nixos/tests/installer.nix b/nixos/tests/installer.nix
index 7b949ff93be..866f9882536 100644
--- a/nixos/tests/installer.nix
+++ b/nixos/tests/installer.nix
@@ -363,8 +363,7 @@ in {
       # XXX: Currently, generate-config doesn't detect LUKS yet.
       extraConfig = ''
         boot.kernelParams = lib.mkAfter [ "console=tty0" ];
-        boot.initrd.luks.devices = lib.singleton {
-          name = "cryptroot";
+        boot.initrd.luks.devices.cryptroot = {
           device = "/dev/vda3";
           preLVM = true;
         };