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# EditorConfig is awesome: https://editorconfig.org
# top-most EditorConfig file
root = true
[*.md]
indent_style = space
indent_size = 2
trim_trailing_whitespace = true
[*.nix]
indent_style = space
indent_size = 2
trim_trailing_whitespace = true

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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
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The licenses for most software and other practical works are designed
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Notwithstanding any other provision of this License, you have
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The Free Software Foundation may publish revised and/or new versions of
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If the Program specifies that a proxy can decide which future
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THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
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HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
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If the disclaimer of warranty and limitation of liability provided
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END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

34
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# FOO UpDater
Declaratively keep your stuff up to date in your nixos config.
## Usage
```nix
{
description = "My flake config";
inputs.fooud.url = "https://git.squi.bid/squi.bid/fooud";
outputs = { self, nixpkgs, fooud }: {
nixosConfigurations.my-system = nixpkgs.lib.nixosSystem {
modules = [{
services.nginx.virtualHosts."squi.bid" = {
root = fooud.lib.gitUpdater {
git = "https://git.squi.bid/squibid/squi.bid"; # the source of the data
dest = "/var/www/squi.bid"; # where should the files live on disk
keys = [ "BECE5684D3C4005D" ]; # requires the commit to be signed by me
check = "5m"; # we may be no more than 5 minutes out of date from the source
};
locations."/" = {
tryFiles = "$uri $uri.html $uri/";
index = "index.html index.htm";
};
};
}];
};
};
}
```
# TODO
- extract archives
- support copying files from other parts of the filesystem (although that's rathar impure isn't it)
- add some checks

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const std = @import("std");
pub fn build(b: *std.Build) void {
const target = b.standardTargetOptions(.{});
const optimize = b.standardOptimizeOption(.{});
const mod = b.addModule("fooud", .{
.root_source_file = b.path("src/main.zig"),
.target = target,
});
const exe = b.addExecutable(.{
.name = "fooud",
.root_module = b.createModule(.{
.root_source_file = b.path("src/main.zig"),
.target = target,
.optimize = optimize,
.imports = &.{
.{ .name = "fooud", .module = mod },
},
}),
});
const dep_curl = b.dependency("curl", .{});
exe.root_module.addImport("curl", dep_curl.module("curl"));
exe.root_module.linkSystemLibrary("git2", .{});
exe.root_module.linkSystemLibrary("gpgme", .{});
exe.root_module.addIncludePath(b.path("src/util"));
exe.root_module.addCSourceFile(.{ .file = b.path("src/util/gpg_helper.c") });
exe.linkLibC();
b.installArtifact(exe);
const run_step = b.step("run", "Run the app");
const run_cmd = b.addRunArtifact(exe);
run_step.dependOn(&run_cmd.step);
run_cmd.step.dependOn(b.getInstallStep());
if (b.args) |args| {
run_cmd.addArgs(args);
}
}

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.{
.name = .fooud,
.version = "1.0.0",
.fingerprint = 0xe809364a41c00a2b, // Changing this has security and trust implications.
.minimum_zig_version = "0.15.2",
.dependencies = .{
.curl = .{
.url = "https://github.com/jiacai2050/zig-curl/archive/refs/tags/v0.3.2.zip",
.hash = "curl-0.3.2-P4tT4SXPAACuV6f5eyh4jG_1SspjWwMm_vRJfoKrQep5",
},
},
.paths = .{
"build.zig",
"build.zig.zon",
"src",
// For example...
//"LICENSE",
//"README.md",
},
}

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# generated by zon2nix (https://github.com/nix-community/zon2nix)
{ linkFarm, fetchzip, fetchgit }:
linkFarm "zig-packages" [
{
name = "N-V-__8AAFrtpQI1j9eOv7aN3lt3eH1TJfH4npAdRIrg2gGH";
path = fetchzip {
url = "https://github.com/Mbed-TLS/mbedtls/archive/refs/tags/v3.6.0.tar.gz";
hash = "sha256-yzGBkrqh+T/5GS66xL5zJstCmvcfG09TfxqA3F8UPJg=";
};
}
{
name = "N-V-__8AAHipPQF9UuLPiaV1CtJzZIxvTN61tMGdFx8LGjIV";
path = fetchzip {
url = "https://github.com/curl/curl/releases/download/curl-8_8_0/curl-8.8.0.tar.gz";
hash = "sha256-Gqfe8iiC8aCBiuUVO6VYqW5DmqgSv5oS4XvMfQgbwFw=";
};
}
{
name = "N-V-__8AAJj_QgDBhU17TCtcvdjOZZPDfkvxrEAyZkc14VN8";
path = fetchzip {
url = "https://github.com/madler/zlib/releases/download/v1.3.1/zlib-1.3.1.tar.gz";
hash = "sha256-acY8yFzIRYbrZ2CGODoxLnZuppsP6KZy19I9Yy77pfc=";
};
}
{
name = "curl-0.3.2-P4tT4SXPAACuV6f5eyh4jG_1SspjWwMm_vRJfoKrQep5";
path = fetchzip {
url = "https://github.com/jiacai2050/zig-curl/archive/refs/tags/v0.3.2.zip";
hash = "sha256-1FjYirex2Q/zs5GLNtCGgClyV5/SW0GhxFHA1Hm+e4o=";
};
}
]

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{
"nodes": {
"nixpkgs": {
"locked": {
"lastModified": 1764733908,
"narHash": "sha256-QJiih52NU+nm7XQWCj+K8SwUdIEayDQ1FQgjkYISt4I=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "cadcc8de247676e4751c9d4a935acb2c0b059113",
"type": "github"
},
"original": {
"owner": "NixOS",
"ref": "nixpkgs-unstable",
"repo": "nixpkgs",
"type": "github"
}
},
"root": {
"inputs": {
"nixpkgs": "nixpkgs"
}
}
},
"root": "root",
"version": 7
}

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{
description = "Declaratively update your data.";
inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
outputs = { nixpkgs, ... }: {
lib = builtins.import ./lib.nix { pkgs = nixpkgs; };
overlays.default = final: prev: {
fooud = prev.stdenv.mkDerivation rec {
pname = "fooud";
version = "1.0";
src = ./.;
deps = prev.callPackage ./build.zig.zon.nix {};
nativeBuildInputs = [ nixpkgs.zig.hook ];
zigBuildFlags = [ "--system" "${deps}" ];
};
};
};
}

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{ pkgs, ... }:
let
lib = pkgs.lib;
defaultUpdater = { git ? null, url ? null, path ? null, keys ? null, dest, check }:
let
config.systemd.services."fooud-${dest}" = {
serviceConfig = {
Type = "oneshot";
User = "root";
Group = "root";
ExecStart = let
dest = lib.assertMsg dest "dest must be set";
remote =
if git then "--git " + git
else if url then "--url " + url
else if path then "--path " + path
else builtins.throw "one of git, url or path must be set";
keys_str = if git then
lib.strings.concatStrings builtins.map (x: "--key ${x} ") keys
else throw "cannot use keys with git";
in pkgs.writeShellScript "fooud-${dest}-wrapper" ''
${pkgs.fooud}/bin/fooud ${keys_str} ${remote} ${dest}
'';
};
};
config.systemd.timers.${dest} = {
wantedBy = [ "timers.target" ];
timerConfig = {
OnActiveSec = "0s";
OnUnitActiveSec = check;
Unit = "fooud-${dest}.service";
Persistent = true;
};
};
in
dest;
in
let
gitUpdater = { git, keys, dest, check }:
defaultUpdater { git = git; keys = keys; dest = dest; check = check; };
fsUpdater = { path, dest, check }:
defaultUpdater { path = path; dest = dest; check = check; };
urlUpdater = { url, dest, check }:
defaultUpdater { url = url; dest = dest; check = check; };
lib = {
inherit
gitUpdater
fsUpdater
urlUpdater;
};
in
lib

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const NixStore = @This();
const std = @import("std");
const gpa = std.heap.page_allocator;
const NixStoreError = error{
Failure,
};
pub fn add(path: []const u8) NixStoreError![]const u8 {
const res = std.process.Child.run(.{
.allocator = gpa,
.argv = &[_][]const u8{ "nix", "store", "add", path },
}) catch return NixStoreError.Failure;
return res.stdout[0 .. res.stdout.len - 1]; // to chop off the \n
}
pub fn realize(store_path: []const u8) NixStoreError!void {
_ = std.process.Child.run(.{
.allocator = gpa,
.argv = &[_][]const u8{ "nix-store", "--realize", store_path },
}) catch return NixStoreError.Failure;
return;
}
pub fn root(store_path: []const u8, root_path: []const u8) NixStoreError!void {
_ = std.process.Child.run(.{
.allocator = gpa,
.argv = &[_][]const u8{ "nix-store", "--add-root", root_path, "--indirect", store_path },
}) catch return NixStoreError.Failure;
return;
}
pub fn delete(store_path: []const u8) NixStoreError!void {
_ = std.process.Child.run(.{
.allocator = gpa,
.argv = &[_][]const u8{ "nix", "store", "delete", store_path },
}) catch {
return NixStoreError.Failure;
};
return;
}

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const Extractor = @This();
// TODO: impl

153
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const std = @import("std");
const NixStore = @import("NixStore.zig");
const Git = @import("remotes/Git.zig");
const Curl = @import("remotes/Curl.zig");
const Fs = @import("remotes/Fs.zig");
const gpa = std.heap.page_allocator;
const Options = enum {
git,
url,
path,
dest,
key,
extract,
};
const Config = struct {
const Remote = union(enum) {
git: []const u8,
url: []const u8,
path: []const u8,
none,
};
remote: Remote,
dest: ?[]const u8,
keys: std.ArrayList([]const u8),
extract: bool,
};
pub fn main() !void {
var config: Config = .{
.remote = .none,
.dest = null,
.keys = .empty,
.extract = false,
};
try check_args(&config);
const tmp_dest = try std.fmt.allocPrint(gpa, "/tmp/{s}", .{config.dest.?});
defer gpa.free(tmp_dest);
// we're gonna delete the temp file(s) if they exist because we don't want
// to deal with them
var exists = true;
std.fs.cwd().access(tmp_dest, .{}) catch {
exists = false;
};
if (exists) try std.fs.cwd().deleteTree(tmp_dest);
const res = try switch (config.remote) {
.git => Git.get(config.remote.git, tmp_dest, try config.keys.toOwnedSlice(gpa)),
.url => Curl.get(config.remote.url, tmp_dest),
.path => Fs.get(config.remote.path, tmp_dest),
else => unreachable,
};
defer std.fs.cwd().deleteTree(tmp_dest) catch {};
if (!res) {
std.log.err("failed to obtain the remote file(s)", .{});
std.process.exit(1);
}
if (config.extract) {
// TODO: impl
}
// Now that we've gotten all our files it's time to add it to the nix store
const store_path = try NixStore.add(tmp_dest);
try NixStore.realize(store_path);
std.log.info("new store path: {s}", .{store_path});
// link the dest to the new nix store path
var dest_old_store_path: ?[]u8 = null;
while (true) {
std.fs.cwd().symLink(store_path, config.dest.?, .{}) catch |err| switch (err) {
error.PathAlreadyExists => {
// get the old nix store path
const buf: [1024]u8 = undefined;
dest_old_store_path = try std.fs.cwd().readLink(config.dest.?, @constCast(buf[0..]));
std.log.info("old store path: {s}", .{dest_old_store_path.?});
// if the old store path and the current store path are the
// same then don't do anything, nothing will change
if (std.mem.eql(u8, dest_old_store_path.?, store_path)) return;
try std.fs.cwd().deleteFile(config.dest.?);
continue;
},
else => {
if (dest_old_store_path) |path| {
try std.fs.cwd().symLink(path, config.dest.?, .{});
}
return err;
},
};
try NixStore.root(store_path, config.dest.?);
break;
}
// delete the old nix store path
if (dest_old_store_path) |path| {
std.log.info("deleting old store path: {s}", .{path});
NixStore.delete(path) catch |err| if (err == error.Failure) return err;
}
}
fn check_args(config: *Config) !void {
const iter = @constCast(&std.process.args());
while (iter.next()) |arg| if (std.mem.eql(u8, arg[0..2], "--")) {
const t = std.meta.stringToEnum(Options, arg[2..]) orelse {
std.log.err("{s} is not a valid option", .{arg});
std.process.exit(1);
};
if (t == .extract) { // this option doesn't require arguments
config.extract = true;
continue;
}
const val = iter.next() orelse return error.Invalid;
switch (t) {
.git => config.remote = Config.Remote{ .git = val },
.url => config.remote = Config.Remote{ .url = val },
.path => config.remote = Config.Remote{ .path = val },
.key => try config.keys.append(gpa, val),
.dest => config.dest = val,
else => unreachable,
}
};
var err = false;
if (config.remote == .none) {
std.log.err("you must set one of --git, --url, or --path", .{});
err = true;
}
if (config.dest == null) {
std.log.err("you must set a --dest", .{});
err = true;
}
if (config.keys.items.len > 0 and config.remote != .git) {
std.log.err("you can only check keys on a git repository", .{});
err = true;
}
if (config.extract and config.remote == .git) {
std.log.err("you cannot extract a git repository", .{});
err = true;
}
if (err) std.process.exit(1);
}

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const Curl = @This();
const std = @import("std");
const curl = @import("curl");
const gpa = std.heap.page_allocator;
pub fn get(url: []const u8, dest: []const u8) !bool {
const ca_bundle = try curl.allocCABundle(gpa);
defer ca_bundle.deinit();
const easy = try curl.Easy.init(.{ .ca_bundle = ca_bundle });
defer easy.deinit();
// let's get that dest file opened up
const fp = try std.fs.cwd().createFile(dest, .{});
defer fp.close();
const buffer: [1024]u8 = undefined;
const writer = fp.writer(@constCast(&buffer));
var tmp_url = try gpa.alloc(u8, url.len + 1);
defer gpa.free(tmp_url);
@memcpy(tmp_url[0..url.len], url);
tmp_url[url.len] = 0;
// download it
try easy.setUrl(@ptrCast(tmp_url));
try easy.setWriter(@constCast(&writer.interface));
const response = try easy.perform();
if (response.status_code != 200) return false;
try @constCast(&writer.interface).flush();
return true;
}

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const Fs = @This();
const std = @import("std");
pub fn get(src: []const u8, dest: []const u8) !bool {
_ = src;
_ = dest;
// TODO: impl
return false;
}

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const Git = @This();
const std = @import("std");
pub const c = @cImport({
@cInclude("git2.h");
@cInclude("gpgme.h");
@cInclude("gpg_helper.h");
});
pub const GitError = error{
InitFailed,
OpenFailed,
NotFound,
InvalidObject,
InvalidReference,
OutOfMemory,
Unknown,
};
pub fn get(url: []const u8, dest: []const u8, keys: []const []const u8) !bool {
if (c.git_libgit2_init() < 0) return GitError.InitFailed;
defer _ = c.git_libgit2_shutdown();
var exists = true;
std.fs.cwd().access(dest, .{}) catch {
exists = false;
};
var repo: ?*c.git_repository = null;
if (!exists) repo = clone(url, dest) catch return false;
defer if (repo) |r| c.git_repository_free(r);
if (keys.len <= 0) return repo != null;
return try check_signing_key(repo, keys);
}
fn clone(url: []const u8, dest: []const u8) !?*c.git_repository {
var clone_opts: c.git_clone_options = undefined;
_ = c.git_clone_options_init(&clone_opts, c.GIT_CLONE_OPTIONS_VERSION);
var repo: ?*c.git_repository = null;
const err = c.git_clone(&repo, url.ptr, dest.ptr, &clone_opts);
if (err != 0) {
const git_err = c.git_error_last();
if (git_err != null and git_err.*.message != null) {
std.log.err("Clone error {d}: {s}", .{ err, git_err.*.message });
} else {
std.log.err("Clone error {d}: <unknown>", .{err});
}
return null;
}
return repo;
}
fn check_signing_key(repo: ?*c.git_repository, keys: []const []const u8) !bool {
var head_ref: ?*c.git_reference = null;
if (c.git_repository_head(&head_ref, repo) != 0) {
std.log.err("Failed to get HEAD", .{});
return false;
}
defer c.git_reference_free(head_ref);
const oid_ptr = c.git_reference_target(head_ref);
if (oid_ptr == null) {
std.log.err("HEAD is not pointing to a commit", .{});
return false;
}
var signature = c.git_buf{};
var signed_data = c.git_buf{};
if (c.git_commit_extract_signature(&signature, &signed_data, repo, @constCast(oid_ptr), null) != 0) {
std.log.err("HEAD commit is not signed", .{});
return false;
}
defer c.git_buf_dispose(&signature);
defer c.git_buf_dispose(&signed_data);
// gpg me
_ = c.gpgme_check_version(null);
var ctx: c.gpgme_ctx_t = null;
_ = c.gpgme_new(&ctx);
defer _ = c.gpgme_release(ctx);
var sig_data: c.gpgme_data_t = null;
var signed_text_data: c.gpgme_data_t = null;
_ = c.gpgme_data_new_from_mem(&sig_data, signature.ptr, signature.size, 0);
defer _ = c.gpgme_data_release(sig_data);
_ = c.gpgme_data_new_from_mem(&signed_text_data, signed_data.ptr, signed_data.size, 0);
defer _ = c.gpgme_data_release(signed_text_data);
if (c.gpgme_op_verify(ctx, sig_data, signed_text_data, null) != 0) {
std.log.err("Failed to verify signature", .{});
return false;
}
const result = c.gpgme_op_verify_result(ctx);
if (result == null) {
std.log.err("No signature found in verification result", .{});
return false;
}
const fpr = c.first_signature_fpr(ctx);
if (fpr == null) {
std.log.err("No signature found", .{});
return false;
}
for (keys) |key| {
if (std.mem.eql(u8, std.mem.span(fpr + 24), key)) {
return true;
}
}
return false;
}

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#include "gpg_helper.h"
const char* first_signature_fpr(gpgme_ctx_t ctx) {
gpgme_verify_result_t result = gpgme_op_verify_result(ctx);
if (!result || !result->signatures) return NULL;
return result->signatures->fpr;
}

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#include <gpgme.h>
const char* first_signature_fpr(gpgme_ctx_t ctx);