nixos-config/lib/clanlib.nix

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