72 lines
1.7 KiB
Nix
72 lines
1.7 KiB
Nix
{ lib, ... }:
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clanDir:
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let
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allMachineNames = lib.mapAttrsToList (name: _: name) (builtins.readDir clanDir);
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getFactPath = machine: fact: "${clanDir}/machines/${machine}/facts/${fact}";
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readFact =
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machine: fact:
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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 builtins.readFile path else 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 =
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fact:
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let
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machines = allMachineNames;
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facts = lib.genAttrs machines (machine: readFact machine 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 =
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facts:
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let
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# machine -> fact -> factvalue
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machinesFactsAttrs = lib.genAttrs allMachineNames (
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machine: lib.genAttrs facts (fact: readFact machine fact)
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);
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# remove all machines which don't have all facts set
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filteredMachineFactAttrs = lib.filterAttrs (
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_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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{
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inherit
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allMachineNames
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getFactPath
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readFact
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readFactFromAllMachines
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readFactsFromAllMachines
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;
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}
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