241 lines
8.7 KiB
Nix
241 lines
8.7 KiB
Nix
# 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
|
|
({ url = "https://api.${info.host or "github.com"}/repos/${info.owner}/${info.repo}/tarball/${info.rev}"; }
|
|
// (if info ? narHash then { sha256 = info.narHash; } else {})
|
|
);
|
|
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 {})
|
|
// (if info ? submodules then { inherit (info) submodules; } 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 = info.path; };
|
|
narHash = info.narHash;
|
|
}
|
|
else if info.type == "tarball" then
|
|
{ outPath =
|
|
fetchTarball
|
|
({ inherit (info) url; }
|
|
// (if info ? narHash then { sha256 = info.narHash; } else {})
|
|
);
|
|
}
|
|
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}"; }
|
|
// (if info ? narHash then { sha256 = info.narHash; } else {})
|
|
);
|
|
shortRev = builtins.substring 0 7 info.rev;
|
|
}
|
|
else if info.type == "sourcehut" then
|
|
{ inherit (info) rev narHash lastModified;
|
|
outPath =
|
|
fetchTarball
|
|
({ url = "https://${info.host or "git.sr.ht"}/${info.owner}/${info.repo}/archive/${info.rev}.tar.gz"; }
|
|
// (if info ? narHash then { sha256 = info.narHash; } else {})
|
|
);
|
|
shortRev = builtins.substring 0 7 info.rev;
|
|
}
|
|
else
|
|
# FIXME: add Mercurial, tarball inputs.
|
|
throw "flake input has unsupported input type '${info.type}'";
|
|
|
|
callFlake4 = flakeSrc: locks:
|
|
let
|
|
flake = import (flakeSrc + "/flake.nix");
|
|
|
|
inputs = builtins.mapAttrs (n: v:
|
|
if v.flake or true
|
|
then callFlake4 (fetchTree (v.locked // v.info)) v.inputs
|
|
else fetchTree (v.locked // v.info)) locks;
|
|
|
|
outputs = flakeSrc // (flake.outputs (inputs // {self = outputs;}));
|
|
in
|
|
assert flake.edition == 201909;
|
|
outputs;
|
|
|
|
callLocklessFlake = flakeSrc:
|
|
let
|
|
flake = import (flakeSrc + "/flake.nix");
|
|
outputs = flakeSrc // (flake.outputs ({ self = outputs; }));
|
|
in outputs;
|
|
|
|
rootSrc = let
|
|
# Try to clean the source tree by using fetchGit, if this source
|
|
# tree is a valid git repository.
|
|
tryFetchGit = src:
|
|
if isGit && !isShallow
|
|
then
|
|
let res = builtins.fetchGit src;
|
|
in if res.rev == "0000000000000000000000000000000000000000" then removeAttrs res ["rev" "shortRev"] else res
|
|
else {
|
|
outPath =
|
|
# Massage `src` into a store path.
|
|
if builtins.isPath src
|
|
then
|
|
if dirOf (toString src) == builtins.storeDir
|
|
# `builtins.storePath` is not available in pure-eval mode.
|
|
&& builtins ? currentSystem
|
|
then
|
|
# If it's already a store path, don't copy it again.
|
|
builtins.storePath src
|
|
else
|
|
"${src}"
|
|
else
|
|
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 "";
|
|
|
|
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.${builtins.head path})
|
|
(builtins.tail path);
|
|
|
|
outputs = flake.outputs (inputs // { self = result; });
|
|
|
|
result =
|
|
outputs
|
|
# We add the sourceInfo attribute for its metadata, as they are
|
|
# relevant metadata for the flake. However, the outPath of the
|
|
# sourceInfo does not necessarily match the outPath of the flake,
|
|
# as the flake may be in a subdirectory of a source.
|
|
# This is shadowed in the next //
|
|
// sourceInfo
|
|
// {
|
|
# This shadows the sourceInfo.outPath
|
|
inherit outPath;
|
|
|
|
inherit inputs; inherit outputs; inherit sourceInfo; _type = "flake";
|
|
};
|
|
|
|
in
|
|
if node.flake or true then
|
|
assert builtins.isFunction flake.outputs;
|
|
result
|
|
else
|
|
sourceInfo
|
|
)
|
|
lockFile.nodes;
|
|
|
|
result =
|
|
if !(builtins.pathExists lockFilePath)
|
|
then callLocklessFlake rootSrc
|
|
else if lockFile.version == 4
|
|
then callFlake4 rootSrc (lockFile.inputs)
|
|
else if lockFile.version >= 5 && lockFile.version <= 7
|
|
then allNodes.${lockFile.root}
|
|
else throw "lock file '${lockFilePath}' has unsupported version ${toString lockFile.version}";
|
|
|
|
in
|
|
rec {
|
|
defaultNix =
|
|
(builtins.removeAttrs result ["__functor"])
|
|
// (if result ? defaultPackage.${system} then { default = result.defaultPackage.${system}; } else {})
|
|
// (if result ? packages.${system}.default then { default = result.packages.${system}.default; } else {});
|
|
|
|
shellNix =
|
|
defaultNix
|
|
// (if result ? devShell.${system} then { default = result.devShell.${system}; } else {})
|
|
// (if result ? devShells.${system}.default then { default = result.devShells.${system}.default; } else {});
|
|
}
|