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lockFileStr: rootSrc: rootSubdir:
let
lockFile = builtins.fromJSON lockFileStr;
allNodes =
builtins.mapAttrs
(key: node:
let
sourceInfo =
if key == lockFile.root
then rootSrc
else fetchTree (node.info or {} // removeAttrs node.locked ["dir"]);
subdir = if key == lockFile.root then rootSubdir else node.locked.dir or "";
outPath = sourceInfo + ((if subdir == "" then "" else "/") + subdir);
flake = import (outPath + "/flake.nix");
inputs = builtins.mapAttrs
(inputName: inputSpec: allNodes.${resolveInput inputSpec})
(node.inputs or {});
# Resolve a input spec into a node name. An input spec is
# either a node name, or a 'follows' path from the root
# node.
resolveInput = inputSpec:
if builtins.isList inputSpec
then getInputByPath lockFile.root inputSpec
else inputSpec;
# Follow an input path (e.g. ["dwarffs" "nixpkgs"]) from the
# root node, returning the final node.
getInputByPath = nodeName: path:
if path == []
then nodeName
else
getInputByPath
# Since this could be a 'follows' input, call resolveInput.
(resolveInput lockFile.nodes.${nodeName}.inputs.${builtins.head path})
(builtins.tail path);
outputs = flake.outputs (inputs // { self = result; });
result =
outputs
# We add the sourceInfo attribute for its metadata, as they are
# relevant metadata for the flake. However, the outPath of the
# sourceInfo does not necessarily match the outPath of the flake,
# as the flake may be in a subdirectory of a source.
# This is shadowed in the next //
// sourceInfo
// {
# This shadows the sourceInfo.outPath
inherit outPath;
inherit inputs; inherit outputs; inherit sourceInfo; _type = "flake";
};
in
if node.flake or true then
assert builtins.isFunction flake.outputs;
result
else
sourceInfo
)
lockFile.nodes;
in allNodes.${lockFile.root}
|
