+++ /dev/null
-# Compatibility function to allow flakes to be used by
-# non-flake-enabled Nix versions. Given a source tree containing a
-# 'flake.nix' and 'flake.lock' file, it fetches the flake inputs and
-# calls the flake's 'outputs' function. It then returns an attrset
-# containing 'defaultNix' (to be used in 'default.nix'), 'shellNix'
-# (to be used in 'shell.nix').
-
-{ src, system ? builtins.currentSystem or "unknown-system" }:
-
-let
-
- lockFilePath = src + "/flake.lock";
-
- lockFile = builtins.fromJSON (builtins.readFile lockFilePath);
-
- fetchTree =
- info:
- if info.type == "github" then
- { outPath = fetchTarball "https://api.${info.host or "github.com"}/repos/${info.owner}/${info.repo}/tarball/${info.rev}";
- rev = info.rev;
- shortRev = builtins.substring 0 7 info.rev;
- lastModified = info.lastModified;
- lastModifiedDate = formatSecondsSinceEpoch info.lastModified;
- narHash = info.narHash;
- }
- else if info.type == "git" then
- { outPath =
- builtins.fetchGit
- ({ url = info.url; }
- // (if info ? rev then { inherit (info) rev; } else {})
- // (if info ? ref then { inherit (info) ref; } else {})
- );
- lastModified = info.lastModified;
- lastModifiedDate = formatSecondsSinceEpoch 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 =
- if builtins.substring 0 1 info.path == "."
- then builtins.toString src + "/" + info.path
- else info.path;
- };
- narHash = info.narHash;
- }
- else if info.type == "tarball" then
- { outPath = fetchTarball info.url;
- narHash = info.narHash;
- }
- else if info.type == "gitlab" then
- { inherit (info) rev narHash lastModified;
- outPath = fetchTarball "https://${info.host or "gitlab.com"}/api/v4/projects/${info.owner}%2F${info.repo}/repository/archive.tar.gz?sha=${info.rev}";
- shortRev = builtins.substring 0 7 info.rev;
- }
- else
- # FIXME: add Mercurial, tarball inputs.
- throw "flake input has unsupported input type '${info.type}'";
-
- callFlake4 = flakeSrc: locks:
- let
- flake = import (flakeSrc + "/flake.nix");
-
- inputs = builtins.mapAttrs (n: v:
- if v.flake or true
- then callFlake4 (fetchTree (v.locked // v.info)) v.inputs
- else fetchTree (v.locked // v.info)) locks;
-
- outputs = flakeSrc // (flake.outputs (inputs // {self = outputs;}));
- in
- assert flake.edition == 201909;
- outputs;
-
- callLocklessFlake = flakeSrc:
- let
- flake = import (flakeSrc + "/flake.nix");
- outputs = flakeSrc // (flake.outputs ({ self = outputs; }));
- in outputs;
-
- rootSrc = let
- # Try to clean the source tree by using fetchGit, if this source
- # tree is a valid git repository.
- tryFetchGit = src:
- if isGit && !isShallow
- then
- let res = builtins.fetchGit src;
- in if res.rev == "0000000000000000000000000000000000000000" then removeAttrs res ["rev" "shortRev"] else res
- else { outPath = src; };
- # NB git worktrees have a file for .git, so we don't check the type of .git
- isGit = builtins.pathExists (src + "/.git");
- isShallow = builtins.pathExists (src + "/.git/shallow");
-
- in
- { lastModified = 0; lastModifiedDate = formatSecondsSinceEpoch 0; }
- // (if src ? outPath then src else tryFetchGit src);
-
- # Format number of seconds in the Unix epoch as %Y%m%d%H%M%S.
- formatSecondsSinceEpoch = t:
- let
- rem = x: y: x - x / y * y;
- days = t / 86400;
- secondsInDay = rem t 86400;
- hours = secondsInDay / 3600;
- minutes = (rem secondsInDay 3600) / 60;
- seconds = rem t 60;
-
- # Courtesy of https://stackoverflow.com/a/32158604.
- z = days + 719468;
- era = (if z >= 0 then z else z - 146096) / 146097;
- doe = z - era * 146097;
- yoe = (doe - doe / 1460 + doe / 36524 - doe / 146096) / 365;
- y = yoe + era * 400;
- doy = doe - (365 * yoe + yoe / 4 - yoe / 100);
- mp = (5 * doy + 2) / 153;
- d = doy - (153 * mp + 2) / 5 + 1;
- m = mp + (if mp < 10 then 3 else -9);
- y' = y + (if m <= 2 then 1 else 0);
-
- pad = s: if builtins.stringLength s < 2 then "0" + s else s;
- in "${toString y'}${pad (toString m)}${pad (toString d)}${pad (toString hours)}${pad (toString minutes)}${pad (toString seconds)}";
-
- allNodes =
- builtins.mapAttrs
- (key: node:
- let
- sourceInfo =
- if key == lockFile.root
- then rootSrc
- else fetchTree (node.info or {} // removeAttrs node.locked ["dir"]);
-
- subdir = if key == lockFile.root then "" else node.locked.dir or "";
-
- flake = import (sourceInfo + (if subdir != "" then "/" else "") + subdir + "/flake.nix");
-
- inputs = builtins.mapAttrs
- (inputName: inputSpec: allNodes.${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 // sourceInfo // { inherit inputs; inherit outputs; inherit sourceInfo; };
- in
- if node.flake or true then
- assert builtins.isFunction flake.outputs;
- result
- else
- sourceInfo
- )
- lockFile.nodes;
-
- result =
- if !(builtins.pathExists lockFilePath)
- then callLocklessFlake rootSrc
- else if lockFile.version == 4
- then callFlake4 rootSrc (lockFile.inputs)
- else if lockFile.version >= 5 && lockFile.version <= 7
- then allNodes.${lockFile.root}
- else throw "lock file '${lockFilePath}' has unsupported version ${toString lockFile.version}";
-
-in
- rec {
- defaultNix =
- result
- // (if result ? defaultPackage.${system} then { default = result.defaultPackage.${system}; } else {});
-
- shellNix =
- defaultNix
- // (if result ? devShell.${system} then { default = result.devShell.${system}; } else {});
- }
projects / perso / Immae / Config / Nix.git / blobdiff