mirror of
https://github.com/NixOS/nix
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96 lines
2.9 KiB
Nix
96 lines
2.9 KiB
Nix
# This is a helper to callFlake() to lazily fetch flake inputs.
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# The contents of the lock file, in JSON format.
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lockFileStr:
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# A mapping of lock file node IDs to { sourceInfo, subdir } attrsets,
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# with sourceInfo.outPath providing an SourceAccessor to a previously
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# fetched tree. This is necessary for possibly unlocked inputs, in
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# particular the root input, but also --override-inputs pointing to
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# unlocked trees.
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overrides:
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# This is `prim_fetchFinalTree`.
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fetchTreeFinal:
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let
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lockFile = builtins.fromJSON lockFileStr;
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# Resolve a input spec into a node name. An input spec is
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# either a node name, or a 'follows' path from the root
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# node.
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resolveInput =
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inputSpec: if builtins.isList inputSpec then getInputByPath lockFile.root inputSpec else inputSpec;
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# Follow an input attrpath (e.g. ["dwarffs" "nixpkgs"]) from the
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# root node, returning the final node.
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getInputByPath =
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nodeName: path:
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if path == [ ] then
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nodeName
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else
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getInputByPath
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# Since this could be a 'follows' input, call resolveInput.
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(resolveInput lockFile.nodes.${nodeName}.inputs.${builtins.head path})
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(builtins.tail path);
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allNodes = builtins.mapAttrs (
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key: node:
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let
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parentNode = allNodes.${getInputByPath lockFile.root node.parent};
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sourceInfo =
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if overrides ? ${key} then
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overrides.${key}.sourceInfo
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else if node.locked.type == "path" && builtins.substring 0 1 node.locked.path != "/" then
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parentNode.sourceInfo
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// {
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outPath = parentNode.outPath + ("/" + node.locked.path);
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}
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else
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# FIXME: remove obsolete node.info.
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# Note: lock file entries are always final.
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fetchTreeFinal (node.info or { } // removeAttrs node.locked [ "dir" ]);
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subdir = overrides.${key}.dir or node.locked.dir or "";
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outPath = sourceInfo + ((if subdir == "" then "" else "/") + subdir);
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flake = import (outPath + "/flake.nix");
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inputs = builtins.mapAttrs (inputName: inputSpec: allNodes.${resolveInput inputSpec}) (
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node.inputs or { }
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);
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outputs = flake.outputs (inputs // { self = result; });
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result =
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outputs
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# We add the sourceInfo attribute for its metadata, as they are
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# relevant metadata for the flake. However, the outPath of the
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# sourceInfo does not necessarily match the outPath of the flake,
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# as the flake may be in a subdirectory of a source.
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# This is shadowed in the next //
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// sourceInfo
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// {
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# This shadows the sourceInfo.outPath
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inherit outPath;
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inherit inputs;
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inherit outputs;
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inherit sourceInfo;
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_type = "flake";
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};
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in
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if node.flake or true then
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assert builtins.isFunction flake.outputs;
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result
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else
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sourceInfo
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) lockFile.nodes;
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in
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allNodes.${lockFile.root}
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