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Closes #234802 The problem here is that with e.g. { uptime.prefix = "Up"; banner.command = "hostname | figlet -f slant"; } `banner` still appears before `uptime` in the final motd text because Nix sorts attribute names alphabetically internally. To work around this without breaking compatibility or losing the property to override individual sections in other modules - e.g. { banner.color = mkForce "blue"; } I decided to introduce an option `priority` here, similar to the priority field for `nginx`[1] and with the same semantics (i.e. higher value means lower priority). Internally a bunch of env vars are generated, i.e. `env0` to `envN` for `N` sections with each of them containing a declaration for the TOML, i.e. `env0` contains `{ uptime.prefix = "Up"; }` and `env1` contains `{ banner.command = "hostname | figlet -f slant"; }` if `uptime.priority` is set to a value below 1000. In this order, the declarations are concatenated together by `jq(1)` which doesn't sort keys alphabetically which results in a JSON representation with `uptime` before `banner`. This is finally piped to `json2toml` which converts this into TOML for rust-motd. [1] https://nixos.org/manual/nixos/unstable/options#opt-services.nginx.virtualHosts._name_.locations._name_.priority |
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