65 lines
1.6 KiB
Nix
65 lines
1.6 KiB
Nix
{ lib, machineDir, ... }:
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let
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allMachineNames = lib.mapAttrsToList (name: _: name) (builtins.readDir machineDir);
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getFactPath = fact: machine:
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"${machineDir}/${machine}/facts/${fact}";
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readFact = fact: machine:
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let
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path = getFactPath fact machine;
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in
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if builtins.pathExists path then
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builtins.readFile path
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else
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null;
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# Example:
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#
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# readFactFromAllMachines zerotier-ip
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# => {
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# machineA = "1.2.3.4";
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# machineB = "5.6.7.8";
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# };
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readFactFromAllMachines = fact:
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let
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machines = allMachineNames;
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facts = lib.genAttrs machines (readFact fact);
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filteredFacts = lib.filterAttrs (_machine: fact: fact != null) facts;
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in
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filteredFacts;
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# all given facts are are set and factvalues are never null.
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#
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# Example:
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#
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# readFactsFromAllMachines [ "zerotier-ip" "syncthing.pub" ]
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# => {
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# machineA =
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# {
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# "zerotier-ip" = "1.2.3.4";
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# "synching.pub" = "1234";
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# };
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# machineB =
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# {
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# "zerotier-ip" = "5.6.7.8";
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# "synching.pub" = "23456719";
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# };
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# };
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readFactsFromAllMachines = facts:
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let
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# machine -> fact -> factvalue
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machinesFactsAttrs = lib.genAttrs allMachineNames (machine: lib.genAttrs facts (fact: readFact fact machine));
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# remove all machines which don't have all facts set
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filteredMachineFactAttrs =
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lib.filterAttrs (_machine: values: builtins.all (fact: values.${fact} != null) facts)
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machinesFactsAttrs;
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in
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filteredMachineFactAttrs;
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in
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{ inherit allMachineNames getFactPath readFact readFactFromAllMachines readFactsFromAllMachines; }
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