mirror of
https://github.com/nix-community/dream2nix.git
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292 lines
8.6 KiB
Nix
292 lines
8.6 KiB
Nix
# copied from github:nix-community/flake-compat/pull/4/head
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# + modified to fix laziness issue in defaultNix
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# Compatibility function to allow flakes to be used by
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# non-flake-enabled Nix versions. Given a source tree containing a
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# 'flake.nix' and 'flake.lock' file, it fetches the flake inputs and
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# calls the flake's 'outputs' function. It then returns an attrset
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# containing 'defaultNix' (to be used in 'default.nix'), 'shellNix'
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# (to be used in 'shell.nix').
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{
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src,
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system ? builtins.currentSystem or "unknown-system",
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}: let
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makeFlakeCompat = impureOverrides: let
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id = x: x;
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overrideWrap' = fn: set: set // {overrideInputs = ov: fn (makeFlakeCompat ov);};
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overrideWrap = overrideWrap' id;
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lockFilePath = src + "/flake.lock";
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lockFile = builtins.fromJSON (builtins.readFile lockFilePath);
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fetchTree = info:
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if info.type == "github"
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then {
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outPath =
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fetchTarball
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(
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{url = "https://api.${info.host or "github.com"}/repos/${info.owner}/${info.repo}/tarball/${info.rev}";}
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// (
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if info ? narHash
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then {sha256 = info.narHash;}
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else {}
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)
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);
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rev = info.rev;
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shortRev = builtins.substring 0 7 info.rev;
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lastModified = info.lastModified;
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lastModifiedDate = formatSecondsSinceEpoch info.lastModified;
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narHash = info.narHash;
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}
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else if info.type == "git"
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then
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{
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outPath =
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builtins.fetchGit
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(
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{url = info.url;}
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// (
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if info ? rev
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then {inherit (info) rev;}
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else {}
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)
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// (
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if info ? ref
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then {inherit (info) ref;}
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else {}
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)
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// (
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if info ? submodules
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then {inherit (info) submodules;}
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else {}
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)
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);
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lastModified = info.lastModified;
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lastModifiedDate = formatSecondsSinceEpoch info.lastModified;
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narHash = info.narHash;
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}
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// (
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if info ? rev
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then {
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rev = info.rev;
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shortRev = builtins.substring 0 7 info.rev;
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}
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else {}
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)
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else if info.type == "path"
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then {
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outPath = builtins.path {
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path =
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if builtins.substring 0 1 info.path != "/"
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then src + ("/" + info.path)
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else info.path;
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};
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narHash = info.narHash;
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}
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else if info.type == "tarball"
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then {
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outPath =
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fetchTarball
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(
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{inherit (info) url;}
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// (
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if info ? narHash
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then {sha256 = info.narHash;}
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else {}
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)
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);
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}
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else if info.type == "gitlab"
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then {
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inherit (info) rev narHash lastModified;
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outPath =
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fetchTarball
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(
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{url = "https://${info.host or "gitlab.com"}/api/v4/projects/${info.owner}%2F${info.repo}/repository/archive.tar.gz?sha=${info.rev}";}
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// (
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if info ? narHash
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then {sha256 = info.narHash;}
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else {}
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)
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);
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shortRev = builtins.substring 0 7 info.rev;
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}
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else
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# FIXME: add Mercurial, tarball inputs.
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throw "flake input has unsupported input type '${info.type}'";
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callLocklessFlake = flakeSrc: let
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flake = import (flakeSrc + "/flake.nix");
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outputs = flakeSrc // (flake.outputs {self = outputs;});
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in
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outputs;
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rootSrc = let
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# Try to clean the source tree by using fetchGit, if this source
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# tree is a valid git repository.
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tryFetchGit = src:
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if isGit && !isShallow
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then let
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res = builtins.fetchGit src;
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in
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if res.rev == "0000000000000000000000000000000000000000"
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then removeAttrs res ["rev" "shortRev"]
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else res
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else {outPath = src;};
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# NB git worktrees have a file for .git, so we don't check the type of .git
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isGit = builtins.pathExists (src + "/.git");
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isShallow = builtins.pathExists (src + "/.git/shallow");
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in
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{
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lastModified = 0;
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lastModifiedDate = formatSecondsSinceEpoch 0;
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}
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// (
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if src ? outPath
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then src
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else tryFetchGit src
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);
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nameValuePair = name: value: {inherit name value;};
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mapAttrs' =
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# A function, given an attribute's name and value, returns a new `nameValuePair`.
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f:
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# Attribute set to map over.
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set:
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builtins.listToAttrs (map (attr: f attr set.${attr}) (builtins.attrNames set));
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# Format number of seconds in the Unix epoch as %Y%m%d%H%M%S.
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formatSecondsSinceEpoch = t: let
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rem = x: y: x - x / y * y;
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days = t / 86400;
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secondsInDay = rem t 86400;
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hours = secondsInDay / 3600;
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minutes = (rem secondsInDay 3600) / 60;
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seconds = rem t 60;
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# Courtesy of https://stackoverflow.com/a/32158604.
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z = days + 719468;
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era =
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(
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if z >= 0
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then z
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else z - 146096
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)
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/ 146097;
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doe = z - era * 146097;
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yoe = (doe - doe / 1460 + doe / 36524 - doe / 146096) / 365;
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y = yoe + era * 400;
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doy = doe - (365 * yoe + yoe / 4 - yoe / 100);
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mp = (5 * doy + 2) / 153;
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d = doy - (153 * mp + 2) / 5 + 1;
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m =
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mp
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+ (
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if mp < 10
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then 3
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else -9
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);
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y' =
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y
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+ (
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if m <= 2
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then 1
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else 0
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);
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pad = s:
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if builtins.stringLength s < 2
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then "0" + s
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else s;
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in "${toString y'}${pad (toString m)}${pad (toString d)}${pad (toString hours)}${pad (toString minutes)}${pad (toString seconds)}";
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rootOverrides =
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mapAttrs'
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(input: lockKey: nameValuePair lockKey (impureOverrides.${input} or null))
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lockFile.nodes.${lockFile.root}.inputs;
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allNodes =
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builtins.mapAttrs
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(
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key: node: let
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sourceInfo =
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if key == lockFile.root
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then rootSrc
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else if rootOverrides.${key} or null != null
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then {
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type = "path";
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outPath = rootOverrides.${key};
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narHash = throw "narHash unimplemented for impureOverride";
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}
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else fetchTree (node.info or {} // removeAttrs node.locked ["dir"]);
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subdir =
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if key == lockFile.root
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then ""
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else node.locked.dir or "";
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flake = import (sourceInfo
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+ (
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if subdir != ""
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then "/"
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else ""
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)
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+ subdir
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+ "/flake.nix");
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inputs =
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builtins.mapAttrs
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(_inputName: inputSpec: allNodes.${resolveInput inputSpec})
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(node.inputs or {});
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# Resolve a input spec into a node name. An input spec is
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# either a node name, or a 'follows' path from the root
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# node.
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resolveInput = inputSpec:
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if builtins.isList inputSpec
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then getInputByPath lockFile.root inputSpec
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else inputSpec;
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# Follow an input path (e.g. ["dwarffs" "nixpkgs"]) from the
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# root node, returning the final node.
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getInputByPath = nodeName: path:
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if path == []
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then nodeName
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else
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getInputByPath
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# Since this could be a 'follows' input, call resolveInput.
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(resolveInput lockFile.nodes.${nodeName}.inputs.${builtins.head path})
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(builtins.tail path);
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outputs = flake.outputs (inputs // {self = result;});
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result =
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outputs
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// sourceInfo
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// {
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inherit inputs;
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inherit outputs;
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inherit sourceInfo;
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_type = "flake";
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};
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in
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if node.flake or true
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then assert builtins.isFunction flake.outputs; result
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else sourceInfo
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)
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lockFile.nodes;
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result =
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if !(builtins.pathExists lockFilePath)
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then callLocklessFlake rootSrc
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else if lockFile.version >= 5 && lockFile.version <= 7
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then allNodes.${lockFile.root}
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else throw "lock file '${lockFilePath}' has unsupported version ${toString lockFile.version}";
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in
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builtins.mapAttrs (key: attr: overrideWrap' (res: res.${key}) attr)
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{
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defaultNix =
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builtins.removeAttrs result ["__functor"];
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};
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in
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makeFlakeCompat {}
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