git.delta.rocks / jrsonnet / refs/commits / 8fa5c73b5fe4

1use std::{2	collections::BTreeMap,3	env::current_dir,4	ffi::OsString,5	str::FromStr,6	sync::{Arc, Mutex},7};89use anyhow::{Context, Result, bail};10use nix_eval::{11	FetchSettings, FlakeLockFlags, FlakeReference, FlakeReferenceParseFlags, FlakeSettings, Value,12	gc_now, nix_go, util::assert_warn,13};14use nom::{15	Parser,16	bytes::complete::take_while1,17	character::complete::char,18	combinator::{map, opt},19	multi::separated_list1,20	sequence::{preceded, separated_pair},21};2223use crate::{24	fleetdata::FleetData,25	host::{Config, ConfigHost, FleetConfigInternals},26};2728#[derive(Clone)]29pub enum HostItem {30	Host {31		name: String,32		attrs: BTreeMap<String, String>,33	},34	Tag {35		name: String,36		attrs: BTreeMap<String, String>,37	},38}39fn host_item_parser(input: &str) -> Result<HostItem, String> {40	fn err_to_string(err: nom::Err<nom::error::Error<&str>>) -> String {41		err.to_string()42	}4344	let (input, is_tag) = map(opt(char('@')), |c| c.is_some())45		.parse_complete(input)46		.map_err(err_to_string)?;47	let (input, name) = map(48		take_while1(|v| v != ',' && v != '?' && v != '@'),49		str::to_owned,50	)51	.parse_complete(input)52	.map_err(err_to_string)?;5354	let kw_item = separated_pair(55		map(take_while1(|v| v != '&' && v != '='), str::to_owned),56		char('='),57		map(take_while1(|v| v != '&'), str::to_owned),58	);59	let kw = map(separated_list1(char('&'), kw_item), |vec| {60		vec.into_iter().collect::<BTreeMap<_, _>>()61	});62	let mut opt_kw = map(opt(preceded(char('?'), kw)), Option::unwrap_or_default);6364	let (input, attrs) = opt_kw.parse_complete(input).map_err(err_to_string)?;6566	if !input.is_empty() {67		return Err(format!("unexpected trailing input: {input:?}"));68	}69	Ok(if is_tag {70		HostItem::Tag { name, attrs }71	} else {72		HostItem::Host { name, attrs }73	})74}7576// TODO: Rename to HostSelector77#[derive(clap::Parser, Clone)]78pub struct FleetOpts {79	/// All hosts except those would be skipped80	#[clap(long, number_of_values = 1, value_parser = host_item_parser)]81	pub only: Vec<HostItem>,8283	/// Hosts to skip84	#[clap(long, number_of_values = 1)]85	pub skip: Vec<String>,8687	/// Host, which should be threaten as current machine88	// TODO: Replace with connectivity refactor89	#[clap(long, default_value_t = hostname::get().expect("unknown hostname").to_str().expect("hostname is not utf-8").to_owned())]90	pub localhost: String,9192	/// Override detected system for host, to perform builds via93	/// binfmt-declared qemu instead of trying to crosscompile94	#[clap(long, default_value = env!("NIX_SYSTEM"))]95	pub local_system: String,9697	/// By default fleet continues on single derivation build failure98	/// this flag makes command fail immediately99	///100	/// Opposite of Nix's --keep-going101	#[clap(long)]102	pub fail_fast: bool,103}104105impl FleetOpts {106	pub async fn filter_skipped(107		&self,108		hosts: impl IntoIterator<Item = ConfigHost>,109	) -> Result<Vec<ConfigHost>> {110		let mut out = Vec::new();111		for host in hosts {112			if self.should_skip(&host).await? {113				continue;114			}115			out.push(host);116		}117		Ok(out)118	}119	pub async fn should_skip(&self, host: &ConfigHost) -> Result<bool> {120		if self.skip.iter().any(|h| h as &str == host.name) {121			return Ok(true);122		}123		if self.only.is_empty() {124			return Ok(false);125		}126		let mut have_group_matches = false;127		for item in self.only.iter() {128			match item {129				HostItem::Host { name, .. } if *name == host.name => {130					return Ok(false);131				}132				HostItem::Tag { .. } => {133					have_group_matches = true;134				}135				_ => {}136			}137		}138		if have_group_matches {139			let host_tags = host.tags().await?;140			for item in self.only.iter() {141				match item {142					HostItem::Tag { name, .. } if host_tags.contains(name) => {143						return Ok(false);144					}145					_ => {}146				}147			}148		}149		Ok(true)150	}151	pub async fn action_attr<T: FromStr>(&self, host: &ConfigHost, attr: &str) -> Result<Option<T>>152	where153		T::Err: Sync,154		anyhow::Error: From<T::Err>,155	{156		let str = self.action_attr_str(host, attr).await?;157		Ok(str.map(|v| T::from_str(&v)).transpose()?)158	}159	pub async fn action_attr_str(&self, host: &ConfigHost, attr: &str) -> Result<Option<String>> {160		if self.only.is_empty() {161			return Ok(None);162		}163		let mut have_group_matches = false;164		for item in self.only.iter() {165			match item {166				HostItem::Host { name, attrs }167					if *name == host.name && attrs.contains_key(attr) =>168				{169					return Ok(attrs.get(attr).cloned());170				}171				HostItem::Tag { attrs, .. } if attrs.contains_key(attr) => {172					have_group_matches = true;173				}174				_ => {}175			}176		}177		if have_group_matches {178			let host_tags = host.tags().await?;179			for item in self.only.iter() {180				match item {181					HostItem::Tag { name, attrs }182						if host_tags.contains(name) && attrs.contains_key(attr) =>183					{184						return Ok(attrs.get(attr).cloned());185					}186					_ => {}187				}188			}189		}190		Ok(None)191	}192	pub fn is_local(&self, host: &str) -> bool {193		self.localhost == host194	}195196	// TODO: Config should be detached from opts.197	pub async fn build(&self, nix_args: Vec<OsString>, assert: bool) -> Result<Config> {198		let cwd = current_dir()?;199		let mut directory = cwd.clone();200		let mut fleet_data_path = directory.join("fleet.nix");201		while !fleet_data_path.is_file() {202			// fleet.nix203			fleet_data_path.pop();204			if !directory.pop() || !fleet_data_path.pop() {205				bail!(206					"fleet.nix not found at {} or any of the parent directories",207					cwd.display()208				);209			}210			fleet_data_path.push("fleet.nix");211		}212		let bytes =213			std::fs::read_to_string(&fleet_data_path).context("reading fleet state (fleet.nix)")?;214		let data: Mutex<FleetData> = nixlike::parse_str(&bytes)?;215216		let mut fetch_settings = FetchSettings::new();217		fetch_settings.set(c"warn-dirty", c"false");218219		let mut flake_settings = FlakeSettings::new()?;220		let mut parse = FlakeReferenceParseFlags::new(&flake_settings)?;221		// For some reason, lazy trees not being used when there is no base dir set222		parse.set_base_dir("/")?;223224		let (mut flake, _) = FlakeReference::new(225			directory226				.to_str()227				.ok_or_else(|| anyhow::anyhow!("fleet dir should have utf-8 path"))?,228			&flake_settings,229			&parse,230			&fetch_settings,231		)?;232233		let lock = FlakeLockFlags::new(&flake_settings)?;234235		let flake = flake.lock(&fetch_settings, &flake_settings, &lock)?;236237		let flake = flake.get_attrs(&mut flake_settings)?;238239		let builtins_field = Value::eval("builtins")?;240241		let fleet_root = flake.get_field("fleetConfigurations")?;242		let data_val = Value::serialized(&data)?;243		let fleet_field = nix_go!(fleet_root.default(data_val));244245		let config_field = nix_go!(fleet_field.config);246247		if assert {248			assert_warn("fleet config evaluation", &config_field)249				.await250				.context("failed to verify assertions")?;251		}252253		let import = nix_go!(builtins_field.import);254		let overlays = nix_go!(config_field.nixpkgs.overlays);255		let nixpkgs = nix_go!(config_field.nixpkgs.buildUsing);256		let nixpkgs_imported = nix_go!(import(nixpkgs));257258		let default_pkgs = nix_go!(nixpkgs_imported(Obj {259			overlays,260			system: self.local_system.clone(),261		}));262263		if cfg!(debug_assertions) {264			gc_now();265		}266267		Ok(Config(Arc::new(FleetConfigInternals {268			directory,269			data,270			local_system: self.local_system.clone(),271			nix_args,272			config_field,273			default_pkgs,274			nixpkgs,275			localhost: self.localhost.to_owned(),276		})))277	}278}