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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}
|
