nixos-config/nixos/lib/clanlib.nix

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