First version.

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R-VdP 2023-02-01 16:22:55 +00:00
parent c36768018a
commit 6a849d71d0
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7 changed files with 556 additions and 4 deletions

6
.gitignore vendored
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@ -2,9 +2,7 @@
# will have compiled files and executables
/target/
# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
Cargo.lock
# These are backup files generated by rustfmt
**/*.rs.bk
result

323
Cargo.lock generated Normal file
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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 3
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9
Cargo.toml Normal file
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@ -0,0 +1,9 @@
[package]
name = "service-manager"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
clap = { version = "4.1.4", features = ["derive"] }

43
flake.lock generated Normal file
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{
"nodes": {
"flake-utils": {
"locked": {
"lastModified": 1667395993,
"narHash": "sha256-nuEHfE/LcWyuSWnS8t12N1wc105Qtau+/OdUAjtQ0rA=",
"owner": "numtide",
"repo": "flake-utils",
"rev": "5aed5285a952e0b949eb3ba02c12fa4fcfef535f",
"type": "github"
},
"original": {
"owner": "numtide",
"repo": "flake-utils",
"type": "github"
}
},
"nixpkgs": {
"locked": {
"lastModified": 1675115703,
"narHash": "sha256-4zetAPSyY0D77x+Ww9QBe8RHn1akvIvHJ/kgg8kGDbk=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "2caf4ef5005ecc68141ecb4aac271079f7371c44",
"type": "github"
},
"original": {
"owner": "NixOS",
"ref": "nixos-unstable",
"repo": "nixpkgs",
"type": "github"
}
},
"root": {
"inputs": {
"flake-utils": "flake-utils",
"nixpkgs": "nixpkgs"
}
}
},
"root": "root",
"version": 7
}

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flake.nix Normal file
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{
inputs = {
nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
flake-utils.url = "github:numtide/flake-utils";
};
outputs = { self, nixpkgs, flake-utils }: {
serviceConfig =
let
system = flake-utils.lib.system.x86_64-linux;
lib = nixpkgs.lib;
nixosConfig = nixpkgs.lib.nixosSystem {
inherit system;
specialArgs = { };
modules = [ ./modules ];
};
services = lib.flip lib.genAttrs
(serviceName:
nixosConfig.config.systemd.units."${serviceName}.service".unit)
# TODO: generate this list from the config instead of hard coding
[
"service-1"
"service-2"
];
in
nixpkgs.legacyPackages.${system}.writeTextFile {
name = "services";
destination = "/services.json";
text = lib.generators.toJSON { } services;
};
};
}

45
modules/default.nix Normal file
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{ pkgs, ... }: {
systemd.services =
let
service-1 = "service-1";
service-2 = "service-2";
in
{
${service-1} = {
enable = true;
description = service-1;
wants = [ "network-online.target" ];
after = [
"network-online.target"
"avahi-daemon.service"
"chrony.service"
"nss-lookup.target"
"tinc.service"
"pulseaudio.service"
];
serviceConfig = {
Type = "oneshot";
RemainAfterExit = true;
script = ''
true
'';
ExecReload = "true";
};
wantedBy = [ "multi-user.target" ];
};
${service-2} = {
enable = true;
description = service-2;
serviceConfig = {
Type = "simple";
};
partOf = [ "${service-1}.service" ];
wantedBy = [ "${service-1}.service" ];
script = ''
true
'';
};
};
}

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src/main.rs Normal file
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use clap::Parser;
use std::error::Error;
use std::{env, process, str};
#[derive(Debug)]
struct StorePath {
path: String,
}
impl From<String> for StorePath {
fn from(path: String) -> Self {
StorePath {
path: path.trim().into(),
}
}
}
#[derive(Parser, Debug)]
#[command(author, version, about, long_about=None)]
struct Args {
#[arg(short, long)]
flake_uri: String,
}
fn main() -> Result<(), Box<dyn Error>> {
let args = Args::parse();
let profile_name = "service-manager";
// TODO: we temporarily put this under per-user to avoid needing root access
// we will move this to /nix/var/nix/profiles/system later on.
let user = env::var("USER").expect("USER env var undefined");
let profile_path = format!("/nix/var/nix/profiles/per-user/{}/{}", user, profile_name);
let flake_attr = "serviceConfig";
let nix_build_output = run_nix_build(&args.flake_uri, flake_attr);
let store_path = get_store_path(nix_build_output)?;
println!("Found store path: {:?}", store_path);
print_out_and_err(install_nix_profile(&store_path, &profile_path));
Ok(())
}
fn install_nix_profile(store_path: &StorePath, profile_path: &str) -> process::Output {
process::Command::new("nix-env")
.arg("--profile")
.arg(profile_path)
.arg("--install")
.arg(&store_path.path)
.arg("--remove-all")
.output()
.expect("Failed to execute nix-env, is it on your path?")
}
fn get_store_path(nix_build_result: process::Output) -> Result<StorePath, Box<dyn Error>> {
if nix_build_result.status.success() {
return String::from_utf8(nix_build_result.stdout)
.map_err(Box::from)
.map(StorePath::from);
} else {
String::from_utf8(nix_build_result.stderr).map_or_else(boxed_error(), boxed_error())
}
}
fn run_nix_build(flake_uri: &str, flake_attr: &str) -> process::Output {
process::Command::new("nix")
.arg("build")
.arg(format!("{}#{}", flake_uri, flake_attr))
.arg("--print-out-paths")
.output()
.expect("Failed to execute nix, is it on your path?")
}
fn print_out_and_err(output: process::Output) -> process::Output {
print_u8(&output.stdout);
print_u8(&output.stderr);
output
}
fn print_u8(bytes: &[u8]) {
str::from_utf8(bytes).map_or((), |s| {
if !s.is_empty() {
println!("{}", s)
}
})
}
pub fn compose<A, B, C, G, F>(f: F, g: G) -> impl Fn(A) -> C
where
F: Fn(B) -> C,
G: Fn(A) -> B,
{
move |x| f(g(x))
}
fn boxed_error<V, E>() -> impl Fn(E) -> Result<V, Box<dyn Error>>
where
E: Into<Box<dyn Error>>,
{
compose(Err, Into::into)
}