git.delta.rocks / jrsonnet / refs/commits / faec7071817b

--- a/cmds/fleet/src/cmds/build_systems.rs
+++ b/cmds/fleet/src/cmds/build_systems.rs
@@ -30,9 +30,9 @@
 
 async fn build_task(config: Config, hostname: String, build_attr: &str) -> Result<PathBuf> {
 	info!("building");
-	let host = config.host(&hostname).await?;
+	let host = config.host(&hostname)?;
 	// let action = Action::from(self.subcommand.clone());
-	let nixos = host.nixos_config().await?;
+	let nixos = host.nixos_config()?;
 	let drv = nix_go!(nixos.system.build[{ build_attr }]);
 	let out_output = spawn_blocking(move || drv.build("out"))
 		.await
@@ -59,7 +59,7 @@
 
 impl BuildSystems {
 	pub async fn run(self, config: &Config, opts: &FleetOpts) -> Result<()> {
-		let hosts = opts.filter_skipped(config.list_hosts().await?).await?;
+		let hosts = opts.filter_skipped(config.list_hosts()?)?;
 		let set = LocalSet::new();
 		let build_attr = self.build_attr.clone();
 		for host in hosts {
@@ -95,20 +95,20 @@
 
 impl Deploy {
 	pub async fn run(self, config: &Config, opts: &FleetOpts) -> Result<()> {
-		let hosts = opts.filter_skipped(config.list_hosts().await?).await?;
+		let hosts = opts.filter_skipped(config.list_hosts()?)?;
 		let set = LocalSet::new();
 		for host in hosts.into_iter() {
 			let config = config.clone();
 			let span = info_span!("deploy", host = field::display(&host.name));
 			let hostname = host.name.clone();
 			let opts = opts.clone();
-			if let Some(deploy_kind) = opts.action_attr::<DeployKind>(&host, "deploy_kind").await? {
+			if let Some(deploy_kind) = opts.action_attr::<DeployKind>(&host, "deploy_kind")? {
 				host.set_deploy_kind(deploy_kind);
 			};
-			if let Some(destination) = opts.action_attr::<String>(&host, "dest").await? {
+			if let Some(destination) = opts.action_attr::<String>(&host, "dest")? {
 				host.set_session_destination(destination);
 			};
-			if let Some(legacy) = opts.action_attr::<bool>(&host, "legacy_ssh_store").await? {
+			if let Some(legacy) = opts.action_attr::<bool>(&host, "legacy_ssh_store")? {
 				host.set_legacy_ssh_store(legacy);
 			};
 
@@ -153,7 +153,7 @@
 						self.action,
 						&host,
 						remote_path,
-						match opts.action_attr(&host, "specialisation").await {
+						match opts.action_attr(&host, "specialisation") {
 							Ok(v) => v,
 							_ => {
 								error!("unreachable? failed to get specialization");

--- a/cmds/fleet/src/cmds/info.rs
+++ b/cmds/fleet/src/cmds/info.rs
@@ -35,7 +35,7 @@
 		let mut data = Vec::new();
 		match self.cmd {
 			InfoCmd::ListHosts { ref tagged } => {
-				'host: for host in config.list_hosts().await? {
+				'host: for host in config.list_hosts()? {
 					if !tagged.is_empty() {
 						let config = &config.config_field;
 						let host_name = &host.name;
@@ -59,7 +59,7 @@
 					"at leas one of --external or --internal must be set"
 				);
 				let mut out = <BTreeSet<String>>::new();
-				let host = config.system_config(&host).await?;
+				let host = config.system_config(&host)?;
 				if external {
 					let data: Vec<String> = nix_go_json!(host.network.externalIps);
 					out.extend(data);

--- a/cmds/fleet/src/cmds/rollback.rs
+++ b/cmds/fleet/src/cmds/rollback.rs
@@ -75,7 +75,7 @@
 
 impl RollbackSingle {
 	pub(crate) async fn run(&self, config: &Config, _opts: &FleetOpts) -> Result<()> {
-		let host = config.host(&self.machine).await?;
+		let host = config.host(&self.machine)?;
 		match &self.action {
 			RollbackAction::ListTargets => {
 				let generations = list_all_generations(&host, config).await;

--- a/cmds/fleet/src/cmds/secrets/mod.rs
+++ b/cmds/fleet/src/cmds/secrets/mod.rs
@@ -1,24 +1,16 @@
 use std::{
-	collections::{BTreeMap, BTreeSet, HashSet},
-	io::{self, Read, Write, stdin, stdout},
+	collections::{BTreeSet, HashSet},
+	io::{Read, Write, stdin, stdout},
 	path::PathBuf,
 };
 
-use anyhow::{Context, Result, anyhow, bail, ensure};
-use chrono::{DateTime, Utc};
+use anyhow::{Context, Result, bail, ensure};
 use clap::Parser;
-use fleet_base::{
-	fleetdata::{FleetSecretData, FleetSecretDistribution, FleetSecretPart, encrypt_secret_data},
-	host::Config,
-	opts::FleetOpts,
-	secret::{Expectations, RegenerationReason, secret_needs_regeneration},
-};
+use fleet_base::{host::Config, opts::FleetOpts};
 use fleet_shared::SecretData;
-use nix_eval::{NixType, Value, nix_go, nix_go_json};
-use serde::Deserialize;
-use tabled::{Table, Tabled};
-use tokio::{fs::read, task::spawn_blocking};
-use tracing::{Instrument, error, info, info_span, warn};
+use tabled::Tabled;
+use tokio::fs::read;
+use tracing::{info, info_span, warn};
 
 #[derive(Parser)]
 pub enum Secret {
@@ -145,13 +137,7 @@
 }
 */
 
-#[derive(Deserialize)]
-#[serde(rename_all = "camelCase")]
-enum GeneratorKind {
-	Impure,
-	Pure,
-}
-
+/*
 async fn generate_pure(
 	_config: &Config,
 	_display_name: &str,
@@ -315,6 +301,7 @@
 		}
 	}
 }
+*/
 /*
 async fn generate_shared(
 	config: &Config,
@@ -421,8 +408,8 @@
 				todo!("part of fleet-pusher")
 			}
 			Secret::ForceKeys => {
-				for host in config.list_hosts().await? {
-					if opts.should_skip(&host).await? {
+				for host in config.list_hosts()? {
+					if opts.should_skip(&host)? {
 						continue;
 					}
 					config.key(&host.name).await?;
@@ -467,7 +454,7 @@
 					let Some(identity_holder) = identity_holder else {
 						bail!("no available holder found");
 					};
-					let host = config.host(identity_holder).await?;
+					let host = config.host(identity_holder)?;
 					host.decrypt(part.raw.clone()).await?
 				} else {
 					part.raw.data.clone()
@@ -619,7 +606,7 @@
 			}
 			Secret::List {} => {
 				let _span = info_span!("loading secrets").entered();
-				let configured = config.list_configured_shared().await?;
+				let configured = config.list_configured_shared()?;
 				#[derive(Tabled)]
 				struct SecretDisplay {
 					#[tabled(rename = "Name")]
@@ -662,7 +649,7 @@
 					.host_secret(&machine, &name)
 					.context("secret not found")?;
 				if let Some(data) = secret.secret.parts.get(&part) {
-					let host = config.host(&machine).await?;
+					let host = config.host(&machine)?;
 					let secret = host.decrypt(data.raw.clone()).await?;
 					String::from_utf8(secret).context("secret is not utf8")?
 				} else if add {

--- a/cmds/fleet/src/main.rs
+++ b/cmds/fleet/src/main.rs
@@ -216,13 +216,10 @@
 		.map(|a| extra_args::parse_os(&a))
 		.transpose()?
 		.unwrap_or_default();
-	let config = opts
-		.fleet_opts
-		.build(
-			nix_args,
-			matches!(opts.command, Opts::Deploy(_) | Opts::BuildSystems(_)),
-		)
-		.await?;
+	let config = opts.fleet_opts.build(
+		nix_args,
+		matches!(opts.command, Opts::Deploy(_) | Opts::BuildSystems(_)),
+	)?;
 
 	match run_command(&config, opts.fleet_opts, opts.command).await {
 		Ok(()) => {

--- a/crates/fleet-base/src/host.rs
+++ b/crates/fleet-base/src/host.rs
@@ -471,10 +471,13 @@
 		cmd.run().await
 	}
 }
+
+struct HostSecretDefinition(Value);
+
 impl ConfigHost {
 	// TOCTOU is possible here in case if config is changed, but this case is not handled anywhere anyway,
 	// assuming getting tags always returns the same value.
-	pub async fn tags(&self) -> Result<Vec<String>> {
+	pub fn tags(&self) -> Result<Vec<String>> {
 		if let Some(v) = self.groups.get() {
 			return Ok(v.clone());
 		}
@@ -487,7 +490,7 @@
 
 		Ok(tags)
 	}
-	pub async fn nixos_config(&self) -> Result<Value> {
+	pub fn nixos_config(&self) -> Result<Value> {
 		if let Some(v) = self.nixos_config.get() {
 			return Ok(v.clone());
 		}
@@ -495,7 +498,7 @@
 			bail!("local host has no nixos_config");
 		};
 		let nixos_config = nix_go!(host_config.nixos.config);
-		assert_warn("nixos config evaluation", &nixos_config).await?;
+		assert_warn("nixos config evaluation", &nixos_config)?;
 
 		let _ = self.nixos_config.set(nixos_config.clone());
 
@@ -522,7 +525,7 @@
 	}
 
 	/// Packages for this host, resolved with nixpkgs overlays
-	pub async fn pkgs(&self) -> Result<Value> {
+	pub fn pkgs(&self) -> Result<Value> {
 		if let Some(value) = &self.pkgs_override {
 			return Ok(value.clone());
 		}
@@ -534,17 +537,29 @@
 	}
 }
 
+pub struct SharedSecretDefinition(Value);
+impl SharedSecretDefinition {
+	pub fn expected_owners(&self) -> Result<BTreeSet<String>> {
+		let secret = &self.0;
+		Ok(nix_go_json!(secret.expectedOwners))
+	}
+	pub fn generator(&self) -> Result<Value> {
+		let secret = &self.0;
+		Ok(nix_go!(secret.generator))
+	}
+}
+
 impl Config {
-	pub async fn tagged_hostnames(&self, tag: &str) -> Result<Vec<String>> {
+	pub fn tagged_hostnames(&self, tag: &str) -> Result<Vec<String>> {
 		let config = &self.config_field;
 		let tagged: Vec<String> = nix_go_json!(config.taggedWith[{ tag }]);
 		Ok(tagged)
 	}
-	pub async fn expand_owner_set(&self, owners: Vec<String>) -> Result<BTreeSet<String>> {
+	pub fn expand_owner_set(&self, owners: Vec<String>) -> Result<BTreeSet<String>> {
 		let mut out = BTreeSet::new();
 		for owner in owners {
 			if let Some(tag) = owner.strip_prefix('@') {
-				let hosts = self.tagged_hostnames(tag).await?;
+				let hosts = self.tagged_hostnames(tag)?;
 				out.extend(hosts);
 			} else {
 				out.insert(owner);
@@ -574,7 +589,7 @@
 		}
 	}
 
-	pub async fn host(&self, name: &str) -> Result<ConfigHost> {
+	pub fn host(&self, name: &str) -> Result<ConfigHost> {
 		let config = &self.config_field;
 		let host_config = nix_go!(config.hosts[{ name }]);
 
@@ -595,23 +610,23 @@
 			legacy_ssh_store: OnceCell::new(),
 		})
 	}
-	pub async fn list_hosts(&self) -> Result<Vec<ConfigHost>> {
+	pub fn list_hosts(&self) -> Result<Vec<ConfigHost>> {
 		let config = &self.config_field;
 		let names = nix_go!(config.hosts).list_fields()?;
 		let mut out = vec![];
 		for name in names {
-			out.push(self.host(&name).await?);
+			out.push(self.host(&name)?);
 		}
 		Ok(out)
 	}
 	// TODO: Replace usages with .host().nixos_config
-	pub async fn system_config(&self, host: &str) -> Result<Value> {
+	pub fn system_config(&self, host: &str) -> Result<Value> {
 		let fleet_field = &self.config_field;
 		Ok(nix_go!(fleet_field.hosts[{ host }].nixos.config))
 	}
 
 	/// Shared secrets configured in fleet.nix or in flake
-	pub async fn list_configured_shared(&self) -> Result<Vec<String>> {
+	pub fn list_configured_shared(&self) -> Result<Vec<String>> {
 		let config_field = &self.config_field;
 		nix_go!(config_field.sharedSecrets).list_fields()
 	}
@@ -659,6 +674,17 @@
 		data.secrets.get(secret).cloned()
 	}
 
+	pub fn secret_definition(&self, secret: &str) -> Result<Option<SharedSecretDefinition>> {
+		let config = &self.config_field;
+		let shared_secrets = nix_go!(config.secrets);
+		if !shared_secrets.has_field(secret)? {
+			return Ok(None);
+		}
+		Ok(Some(SharedSecretDefinition(nix_go!(
+			shared_secrets[secret]
+		))))
+	}
+
 	// TODO: Should this be something modifiable from other processes?
 	// E.g terraform provider might want to update FleetData (e.g secrets),
 	// and current implementation assumes only one process holds current fleet.nix

--- a/crates/fleet-base/src/keys.rs
+++ b/crates/fleet-base/src/keys.rs
@@ -12,10 +12,10 @@
 	pub fn cached_key(&self, host: &str) -> Option<String> {
 		let data = self.data();
 		let key = data.hosts.get(host).map(|h| &h.encryption_key);
-		if let Some(key) = key {
-			if key.is_empty() {
-				return None;
-			}
+		if let Some(key) = key
+			&& key.is_empty()
+		{
+			return None;
 		}
 		key.cloned()
 	}
@@ -30,7 +30,7 @@
 			Ok(key)
 		} else {
 			warn!("Loading key for {}", host);
-			let host = self.host(host).await?;
+			let host = self.host(host)?;
 			let mut cmd = host.cmd("cat").await?;
 			cmd.arg("/etc/ssh/ssh_host_ed25519_key.pub");
 			let key = cmd.run_string().await?;
@@ -47,7 +47,7 @@
 	}
 
 	pub async fn recipients(&self, hosts: Vec<String>) -> Result<Vec<Box<dyn Recipient>>> {
-		let hosts = self.expand_owner_set(hosts).await?;
+		let hosts = self.expand_owner_set(hosts)?;
 		futures::stream::iter(hosts.iter())
 			.then(|m| self.recipient(m.as_ref()))
 			.try_collect::<Vec<_>>()
@@ -57,12 +57,7 @@
 	#[allow(dead_code)]
 	pub async fn orphaned_data(&self) -> Result<Vec<String>> {
 		let mut out = Vec::new();
-		let host_names = self
-			.list_hosts()
-			.await?
-			.into_iter()
-			.map(|h| h.name)
-			.collect_vec();
+		let host_names = self.list_hosts()?.into_iter().map(|h| h.name).collect_vec();
 		for hostname in self
 			.data()
 			.hosts

--- a/crates/fleet-base/src/opts.rs
+++ b/crates/fleet-base/src/opts.rs
@@ -104,20 +104,20 @@
 }
 
 impl FleetOpts {
-	pub async fn filter_skipped(
+	pub fn filter_skipped(
 		&self,
 		hosts: impl IntoIterator<Item = ConfigHost>,
 	) -> Result<Vec<ConfigHost>> {
 		let mut out = Vec::new();
 		for host in hosts {
-			if self.should_skip(&host).await? {
+			if self.should_skip(&host)? {
 				continue;
 			}
 			out.push(host);
 		}
 		Ok(out)
 	}
-	pub async fn should_skip(&self, host: &ConfigHost) -> Result<bool> {
+	pub fn should_skip(&self, host: &ConfigHost) -> Result<bool> {
 		if self.skip.iter().any(|h| h as &str == host.name) {
 			return Ok(true);
 		}
@@ -137,7 +137,7 @@
 			}
 		}
 		if have_group_matches {
-			let host_tags = host.tags().await?;
+			let host_tags = host.tags()?;
 			for item in self.only.iter() {
 				match item {
 					HostItem::Tag { name, .. } if host_tags.contains(name) => {
@@ -149,15 +149,15 @@
 		}
 		Ok(true)
 	}
-	pub async fn action_attr<T: FromStr>(&self, host: &ConfigHost, attr: &str) -> Result<Option<T>>
+	pub fn action_attr<T: FromStr>(&self, host: &ConfigHost, attr: &str) -> Result<Option<T>>
 	where
 		T::Err: Sync,
 		anyhow::Error: From<T::Err>,
 	{
-		let str = self.action_attr_str(host, attr).await?;
+		let str = self.action_attr_str(host, attr)?;
 		Ok(str.map(|v| T::from_str(&v)).transpose()?)
 	}
-	pub async fn action_attr_str(&self, host: &ConfigHost, attr: &str) -> Result<Option<String>> {
+	pub fn action_attr_str(&self, host: &ConfigHost, attr: &str) -> Result<Option<String>> {
 		if self.only.is_empty() {
 			return Ok(None);
 		}
@@ -176,7 +176,7 @@
 			}
 		}
 		if have_group_matches {
-			let host_tags = host.tags().await?;
+			let host_tags = host.tags()?;
 			for item in self.only.iter() {
 				match item {
 					HostItem::Tag { name, attrs }
@@ -195,7 +195,7 @@
 	}
 
 	// TODO: Config should be detached from opts.
-	pub async fn build(&self, nix_args: Vec<OsString>, assert: bool) -> Result<Config> {
+	pub fn build(&self, nix_args: Vec<OsString>, assert: bool) -> Result<Config> {
 		let cwd = current_dir()?;
 		let mut directory = cwd.clone();
 		let mut fleet_data_path = directory.join("fleet.nix");
@@ -248,7 +248,6 @@
 
 		if assert {
 			assert_warn("fleet config evaluation", &config_field)
-				.await
 				.context("failed to verify assertions")?;
 		}
 

--- a/crates/fleet-base/src/primops.rs
+++ b/crates/fleet-base/src/primops.rs
@@ -1,38 +1,168 @@
-use std::cell::OnceCell;
-use std::collections::{BTreeMap, HashMap};
-use std::sync::{Arc, Mutex, OnceLock};
+use std::collections::{BTreeMap, BTreeSet, HashMap};
+use std::sync::OnceLock;
 
-use anyhow::{Context, bail};
+use anyhow::{Context, bail, ensure};
+use fleet_shared::SecretData;
 use itertools::Itertools;
 use nix_eval::{NativeFn, Value, nix_go, nix_go_json};
 use serde::Deserialize;
 use tracing::{info, warn};
 
-use crate::fleetdata::{FleetData, FleetSecrets};
-use crate::host::Config;
+use crate::fleetdata::{
+	Expectations, FleetSecretData, FleetSecretDistribution, FleetSecretPart, GeneratorPart,
+};
+use crate::host::{Config, ConfigHost};
+use crate::secret::{RegenerationReason, secret_needs_regeneration};
+use anyhow::{Result, anyhow};
 
 #[derive(thiserror::Error, Debug)]
 enum Error {}
 
-struct Parts {
-	encrypted: Vec<String>,
-	public: Vec<String>,
+pub static PRIMOPS_DATA: OnceLock<Config> = OnceLock::new();
+
+#[derive(Deserialize)]
+#[serde(rename_all = "camelCase")]
+enum GeneratorKind {
+	Impure,
+	Pure,
 }
 
-trait SecretsBackend {
-	fn has_shared(&self, name: &str);
-	fn has_host(&self, host: &str, name: &str);
-	fn shared_parts(&self, name: &str) -> Parts;
-	fn host_parts(&self, host: &str, name: &str) -> Parts;
+pub fn get_pkgs_and_generators(host_on: &ConfigHost, recipients: Vec<String>) -> Result<Value> {
+	info!("get pkgs");
+	let pkgs = host_on.pkgs()?;
+	let default_mk_secret_generators = nix_go!(pkgs.mkSecretGenerators);
+	let generators = nix_go!(default_mk_secret_generators(Obj { recipients }));
+	Ok(pkgs.clone().attrs_update(generators)?)
+}
+pub fn get_default_pkgs_and_generators(config: &Config) -> Result<Value> {
+	let host_on = config.local_host();
+	get_pkgs_and_generators(&host_on, vec![])
 }
+pub fn call_package(config: &Config, pkgs: &Value, package: &Value) -> Result<Value> {
+	ensure!(
+		package.is_function(),
+		"package should be a function to be called with callPackage"
+	);
+	// No need to use nixpkgs.buildUsing, as only nixpkgs-lib is used.
+	let nixpkgs = &config.nixpkgs;
+	let call_package = nix_go!(nixpkgs.lib.callPackageWith(pkgs));
+	Ok(nix_go!(call_package(package)(Obj {})))
+}
+
+pub fn get_default_generator_drv(config: &Config, generator: &Value) -> Result<Value> {
+	let default_pkgs_and_generators = get_default_pkgs_and_generators(config)?;
+	let default_generator_drv = call_package(config, &default_pkgs_and_generators, generator)
+		.context("failed to initialize generator to get metadata")?;
+
+	Ok(default_generator_drv)
+}
+
+pub async fn generate(
+	config: &Config,
+	expectations: Expectations,
+	generator: &Value,
+	default_generator_drv: &Value,
+) -> Result<FleetSecretDistribution> {
+	let kind: GeneratorKind = nix_go_json!(default_generator_drv.generatorKind);
+
+	match kind {
+		GeneratorKind::Impure => {
+			let impure_on: Option<String> = nix_go_json!(default_generator_drv.impureOn);
 
-struct FsSecretsBackend {}
+			let host_on = if let Some(on) = &impure_on {
+				config
+					.host(on)
+					.context("failed to get secret generation target host")?
+			} else {
+				config.local_host()
+			};
+			let pkgs_and_generators =
+				get_pkgs_and_generators(&host_on, expectations.owners.iter().cloned().collect())
+					.context("failed to get pkgs for target host")?;
+			let generator = call_package(config, &pkgs_and_generators, generator)
+				.context("failed to evaluate generator for target host")?;
 
-pub static PRIMOPS_DATA: OnceLock<Config> = OnceLock::new();
+			let generator = generator
+				.build("out")
+				.context("failed to build generator for target host")?;
 
-#[derive(Deserialize, Debug)]
-struct GeneratorPart {
-	encrypted: bool,
+			let generator = host_on
+				.remote_derivation(&generator)
+				.await
+				.context("failed to copy generator to target host")?;
+
+			// TODO: Remove destdir after everything is done
+			let out_parent = host_on
+				.mktemp_dir()
+				.await
+				.context("failed to prepare generator output dir on target host")?;
+			let out = format!("{out_parent}/out");
+			let mut generator_cmd = host_on.cmd(generator).await?;
+			generator_cmd.env("out", &out);
+			if impure_on.is_none() {
+				let project_path: String = config
+					.directory
+					.clone()
+					.into_os_string()
+					.into_string()
+					.map_err(|e| anyhow!("fleet project path is not utf-8: {e:?}"))?;
+				generator_cmd.env("FLEET_PROJECT", project_path);
+			};
+			generator_cmd
+				.run()
+				.await
+				.context("failed to run impure generator")?;
+
+			{
+				let marker = host_on.read_file_text(format!("{out}/marker")).await?;
+				ensure!(
+					marker == "SUCCESS",
+					"impure generator ended prematurely, secret generation failed"
+				);
+			}
+
+			let mut parts = BTreeMap::new();
+			for part in host_on.read_dir(&out).await? {
+				if part == "created_at" || part == "expires_at" || part == "marker" {
+					continue;
+				}
+				let contents: SecretData = host_on
+					.read_file_text(format!("{out}/{part}"))
+					.await?
+					.parse()
+					.map_err(|e| anyhow!("failed to decode secret {out:?} part {part:?}: {e}"))?;
+				parts.insert(part.to_owned(), FleetSecretPart { raw: contents });
+			}
+
+			let created_at = host_on.read_file_value(format!("{out}/created_at")).await?;
+			let expires_at = host_on
+				.read_file_value(format!("{out}/expires_at"))
+				.await
+				.ok();
+
+			let new_data = FleetSecretData {
+				created_at,
+				expires_at,
+				parts,
+				generation_data: expectations.generation_data.clone(),
+			};
+
+			let new_data = FleetSecretDistribution {
+				secret: new_data,
+				owners: expectations.owners.clone(),
+				_deprecated_managed: true,
+			};
+
+			if let Some(reason) = secret_needs_regeneration(&new_data, &expectations) {
+				bail!("newly generated secret needs to be regenerated: {reason}")
+			}
+
+			Ok(new_data)
+		}
+		GeneratorKind::Pure => {
+			bail!("pure generators are disabled for now")
+		}
+	}
 }
 
 pub fn init_primops() {
@@ -52,52 +182,61 @@
 				.get()
 				.expect("primops data should be set on init");
 
-			info!("get pkgs");
-			let nixpkgs = &config.nixpkgs;
-			let default_pkgs = &config.default_pkgs;
-			let default_mk_secret_generators = nix_go!(default_pkgs.mkSecretGenerators);
-			let generators = nix_go!(default_mk_secret_generators(Obj {
-				recipients: <Vec<String>>::new(),
-			}));
-			let pkgs_and_generators = default_pkgs.clone().attrs_update(generators)?;
+			let shared_def = config.secret_definition(&secret).context("failed to get shared secret definition")?;
 
-			info!("call package");
-			let call_package = nix_go!(nixpkgs.lib.callPackageWith(pkgs_and_generators));
-			let default_generator = call_package
-				.call(generator.clone())
-				.context("calling callPackage with generator")?
-				.call(Value::new_attrs(HashMap::new()))
-				.context("providing extra callPackage args")?;
+			let (shared, generator, expected_owners) = if generator.is_string() {
+				assert_eq!(generator.to_string()?, "shared", "asserted by nixos type system");
+				let Some(shared_def) = shared_def else {
+					bail!("secret {secret} is defined on host {host} as shared, but there is no shared secret with same name defined at fleetConfiguration.secrets.{secret}.generator")
+				};
+				let expected_owners = shared_def.expected_owners()?;
+
+				ensure!(expected_owners.contains(&host), "secret {secret} does not define {host} as expected owner");
 
-			info!("get parts");
-			let mut parts: BTreeMap<String, GeneratorPart> = nix_go_json!(default_generator.parts);
-			info!("got parts: {parts:?}");
+				(true, shared_def.generator()?, expected_owners)
+			} else {
+				if shared_def.is_some() {
+					bail!("hosts can only have their own generators for non-shared secrets, either set host secret generator to \"shared\", or remove shared secret generator at fleetConfiguration.secrets.{secret}.generator")
+				}
 
-			let Some(existing) = config
-				.host_secret(&host, &secret) else {
-				bail!("missing secret {secret} for host {host}; secret needs regeneration")
+				(false, generator.clone(), BTreeSet::from_iter([host.clone()]))
 			};
 
-			info!("got existing: {existing:?}");
+			let default_generator_drv = get_default_generator_drv(config, &generator).context("failed to evaluate default generator")?;
+			let expectations = Expectations {
+				parts: nix_go_json!(default_generator_drv.parts),
+				generation_data: nix_go_json!(default_generator_drv.generationData),
+				owners: expected_owners,
+			};
+
+			let reason: RegenerationReason = 'regenerate: {
+				let Some(existing) = config
+					.host_secret(&host, &secret) else {
+					break 'regenerate RegenerationReason::Missing;
+				};
+				if let Some(reason) = secret_needs_regeneration(&existing, &expectations) {
+					break 'regenerate reason;
+				}
 
-			let mut out = HashMap::new();
+				let mut parts = expectations.parts.clone();
 
-			for (part_name, part) in &existing.secret.parts {
-				let Some(definition) = parts.remove(part_name) else {
-					warn!("secret {secret} part {part_name} is stored, but not defined in nixos config, it will not be passed to nix");
-					continue;
-				};
-				if definition.encrypted != part.raw.encrypted {
-					bail!("secret {secret} part {part_name} is supposed to be {}, but it is {}; secret needs regeneration", if definition.encrypted {"encrypted"} else {"unencrypted"}, if part.raw.encrypted {"encrypted"} else {"unencrypted"});
+				let mut out = HashMap::new();
+				for (part_name, part) in &existing.secret.parts {
+					let Some(definition) = parts.remove(part_name) else {
+						warn!("secret {secret} part {part_name} is stored, but not defined in nixos config, it will not be passed to nix");
+						continue;
+					};
+					assert!(definition.encrypted != part.raw.encrypted, "encryption status is checked by secret_needs_regeneration");
+					out.insert(part_name.as_str(), Value::new_attrs(HashMap::from_iter([("raw", Value::new_str(&part.raw.to_string()))])));
 				}
-				out.insert(part_name.as_str(), Value::new_attrs(HashMap::from_iter([("raw", Value::new_str(&part.raw.to_string()))])));
-			}
-			if !parts.is_empty(){
-				let defs = parts.keys().collect_vec();
-				bail!("secret parts are defined, but not stored: {defs:?}, secret needs regeneration")
-			}
+				assert!(parts.is_empty(), "secret part is missing, secret_needs_regeneration should check that");
 
-			Ok(Value::new_attrs(out))
+				return Ok(Value::new_attrs(out))
+			};
+
+			todo!()
+
+
 		},
 	)
 	.register();