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flake.lock.nix
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flake.lock.nix
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# Adapted from https://github.com/edolstra/flake-compat/blob/master/default.nix
#
# This version only gives back the inputs. In that mode, flake becomes little
# more than a niv replacement.
{
src ? ./.,
}:
let
lockFilePath = src + "/flake.lock";
lockFile = builtins.fromJSON (builtins.readFile lockFilePath);
# Emulate builtins.fetchTree
#
# TODO: only implement polyfill if the builtin doesn't exist?
fetchTree =
info:
if info.type == "github" then
{
outPath = fetchTarball {
url = "https://api.${info.host or "github.com"}/repos/${info.owner}/${info.repo}/tarball/${info.rev}";
sha256 = info.narHash;
};
rev = info.rev;
shortRev = builtins.substring 0 7 info.rev;
lastModified = info.lastModified;
narHash = info.narHash;
}
else if info.type == "git" then
{
outPath = builtins.fetchGit (
{
url = info.url;
sha256 = info.narHash;
}
// (if info ? rev then { inherit (info) rev; } else { })
// (if info ? ref then { inherit (info) ref; } else { })
);
lastModified = info.lastModified;
narHash = info.narHash;
}
// (
if info ? rev then
{
rev = info.rev;
shortRev = builtins.substring 0 7 info.rev;
}
else
{ }
)
else if info.type == "path" then
{
outPath = builtins.path { path = info.path; };
narHash = info.narHash;
}
else if info.type == "tarball" then
{
outPath = fetchTarball {
url = info.url;
sha256 = info.narHash;
};
narHash = info.narHash;
}
else if info.type == "gitlab" then
{
inherit (info) rev narHash lastModified;
outPath = fetchTarball {
url = "https://${info.host or "gitlab.com"}/api/v4/projects/${info.owner}%2F${info.repo}/repository/archive.tar.gz?sha=${info.rev}";
sha256 = info.narHash;
};
shortRev = builtins.substring 0 7 info.rev;
}
else
# FIXME: add Mercurial, tarball inputs.
throw "flake input has unsupported input type '${info.type}'";
allNodes = builtins.mapAttrs (
key: node:
let
sourceInfo =
if key == lockFile.root then
{ }
else
fetchTree (node.info or { } // removeAttrs node.locked [ "dir" ]);
inputs = builtins.mapAttrs (inputName: inputSpec: allNodes.${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);
result = sourceInfo // {
inherit inputs;
inherit sourceInfo;
};
in
if node.flake or true then result else sourceInfo
) lockFile.nodes;
result =
if lockFile.version >= 5 && lockFile.version <= 7 then
allNodes.${lockFile.root}.inputs
else
throw "lock file '${lockFilePath}' has unsupported version ${toString lockFile.version}";
in
result