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60 lines
1.8 KiB
Nix
60 lines
1.8 KiB
Nix
{ config, pkgs, lib, ... }:
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with lib;
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let
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version = config.nix-bitcoin.configVersion;
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# Sorted by increasing version numbers
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changes = [
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# None yet
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# {
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# version = "0.1";
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# condition = config.services.foo.enabled;
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# message = ''
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# demo message
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# '';
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# }
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];
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incompatibleChanges = optionals
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(version != null && versionOlder lastChange)
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(builtins.filter (change: versionOlder change && (change.condition or true)) changes);
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errorMsg = ''
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This version of nix-bitcoin contains the following changes
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that are incompatible with your config (version ${version}):
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${concatMapStringsSep "\n" (change: ''
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- ${change.message}(This change was introduced in version ${change.version})
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'') incompatibleChanges}
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After addressing the above changes, set nix-bitcoin.configVersion = "${lastChange.version}";
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in your nix-bitcoin configuration.
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'';
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versionOlder = change: (builtins.compareVersions change.version version) > 0;
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lastChange = builtins.elemAt changes (builtins.length changes - 1);
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in
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{
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options = {
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nix-bitcoin.configVersion = mkOption {
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type = with types; nullOr str;
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default = null;
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description = ''
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Set this option to the nix-bitcoin release version that your config is
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compatible with.
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When upgrading to a backwards-incompatible release, nix-bitcoin will throw an
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error during evaluation and provide hints for migrating your config to the
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new release.
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'';
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};
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};
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## No config because there are no backwards incompatible releases yet
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# config = {
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# # Force evaluation. An actual option value is never assigned
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# system.extraDependencies = optional (builtins.length incompatibleChanges > 0) (builtins.throw errorMsg);
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# };
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}
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