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nixos/displayManager: improve defaultSession error

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This commit is contained in:
Matt Sturgeon
2026-06-02 18:42:17 +01:00
parent a3a6ad305f
commit 860db540f8
1 changed files with 4 additions and 2 deletions
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6
nixos/modules/services/display-managers/default.nix
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@@ -10,6 +10,8 @@ let
cfg = config.services.displayManager;
opts = options.services.displayManager;
toPretty = lib.generators.toPretty { };
installedSessions =
pkgs.runCommand "desktops"
{
@@ -193,9 +195,9 @@ in
{
assertion = cfg.defaultSession == null || lib.elem cfg.defaultSession cfg.sessionData.sessionNames;
message = ''
Default graphical session, '${toString cfg.defaultSession}', not found.
Default graphical session, ${toPretty cfg.defaultSession}, not found. Definitions:${lib.options.showDefs opts.defaultSession.definitionsWithLocations}.
Valid names for `${opts.defaultSession}` are:
${lib.concatStringsSep "\n " cfg.sessionData.sessionNames}
${lib.concatMapStringsSep "\n " toPretty cfg.sessionData.sessionNames}
'';
}
];