feat(meta): add disallowApplyAll options

integration-tests/allow-apply-all/default.nix

@@ -0,0 +1,19 @@
+{ pkgs ? import ../nixpkgs.nix }:
+
+let
+  tools = pkgs.callPackage ../tools.nix {
+    targets = [ "alpha" ];
+  };
+in tools.makeTest {
+  name = "colmena-allow-apply-all";
+
+  bundle = ./.;
+
+  testScript = ''
+    logs = deployer.fail("cd /tmp/bundle && run-copy-stderr ${tools.colmenaExec} apply")
+
+    assert "no filter supplied" in logs
+
+    deployer.succeed("cd /tmp/bundle && run-copy-stderr ${tools.colmenaExec} apply --on @target")
+  '';
+}

integration-tests/allow-apply-all/hive.nix

@@ -0,0 +1,14 @@
+let
+  tools = import ./tools.nix {
+    insideVm = true;
+    targets = ["alpha"];
+  };
+in {
+  meta = {
+    nixpkgs = tools.pkgs;
+    allowApplyAll = false;
+  };
+
+  deployer = tools.getStandaloneConfigFor "deployer";
+  alpha = tools.getStandaloneConfigFor "alpha";
+}

integration-tests/default.nix

@@ -8,6 +8,8 @@
   flakes-streaming = import ./flakes { evaluator = "streaming"; };
   parallel = import ./parallel {};
 
+  allow-apply-all = import ./allow-apply-all {};
+
   apply-stable = let
     test = import ./apply { pkgs = import ./nixpkgs-stable.nix; };
   in test.override (old: {

manual/src/release-notes.md

@@ -7,6 +7,7 @@
 - In `apply-local`, we now only escalate privileges during activation ([#85](https://github.com/zhaofengli/colmena/issues/85)).
 - Impure overlays are no longer imported by default if a path is specified in `meta.nixpkgs` ([#39](https://github.com/zhaofengli/colmena/issues/39))
 - GC roots are now created right after the builds are complete, as opposed to after activation.
+- The [`meta.allowApplyAll`](./reference/meta.md#allowapplyall) option has been added. If set to false, deployments without a node filter (`--on`) are disallowed.
 
 ## [Release 0.3.0](https://github.com/zhaofengli/colmena/releases/tag/v0.3.0) (2022/04/27)
 

src/command/apply.rs

@@ -151,6 +151,16 @@ pub async fn run(_global_args: &ArgMatches, local_args: &ArgMatches) -> Result<(
         .map(NodeFilter::new)
         .transpose()?;
 
+    if !filter.is_some() {
+      // User did not specify node, we should check meta and see rules
+      let meta = hive.get_meta_config().await?;
+      if !meta.allow_apply_all {
+        log::error!("No node filter is specified and meta.allowApplyAll is set to false.");
+        log::error!("Hint: Filter the nodes with --on.");
+        quit::with_code(1);
+      }
+    }
+
     let goal_arg = local_args.value_of("goal").unwrap();
     let goal = Goal::from_str(goal_arg).unwrap();
 

src/nix/hive/eval.nix

@@ -202,11 +202,21 @@ let
       };
     };
   };
+
+  # Add required config Key here since we don't want to eval nixpkgs
+  metaConfigKeys = [
+    "name" "description"
+    "machinesFile"
+    "allowApplyAll"
+  ];
+
+  metaConfig = lib.filterAttrs (n: v: elem n metaConfigKeys) hive.meta;
 in {
   inherit
     nodes toplevel
     deploymentConfig deploymentConfigSelected
-    evalAll evalSelected evalSelectedDrvPaths introspect;
+    evalAll evalSelected evalSelectedDrvPaths introspect
+    metaConfig;
 
   meta = hive.meta;
 

src/nix/hive/mod.rs

@@ -10,7 +10,7 @@ use std::convert::AsRef;
 
 use tempfile::{NamedTempFile, TempPath};
 use tokio::process::Command;
-use tokio::sync::RwLock;
+use tokio::sync::OnceCell;
 use serde::Serialize;
 use validator::Validate;
 
@@ -22,7 +22,7 @@ use super::{
     NodeFilter,
     NixExpression,
     ProfileDerivation,
-    StorePath,
+    StorePath, MetaConfig,
 };
 use super::deployment::TargetNode;
 use crate::error::ColmenaResult;
@@ -58,8 +58,7 @@ pub struct Hive {
     /// Whether to pass --show-trace in Nix commands.
     show_trace: bool,
 
-    /// The cached machines_file expression.
-    machines_file: RwLock<Option<Option<String>>>,
+    meta_config: OnceCell<MetaConfig>,
 }
 
 struct NixInstantiate<'hive> {
@@ -113,19 +112,26 @@ impl Hive {
     pub fn new(path: HivePath) -> ColmenaResult<Self> {
         let context_dir = path.context_dir();
 
-        Ok(Self {
+        Ok(Self{
             path,
             context_dir,
             assets: Assets::new(),
             show_trace: false,
-            machines_file: RwLock::new(None),
+            meta_config: OnceCell::new(),
         })
     }
 
     pub fn context_dir(&self) -> Option<&Path> {
         self.context_dir.as_ref().map(|p| p.as_ref())
     }
 
+    pub async fn get_meta_config(&self) -> ColmenaResult<&MetaConfig> {
+      self.meta_config.get_or_try_init(||async {
+        self.nix_instantiate("hive.metaConfig").eval()
+            .capture_json().await
+      }).await
+    }
+
     pub fn set_show_trace(&mut self, value: bool) {
         self.show_trace = value;
     }
@@ -142,7 +148,7 @@ impl Hive {
         let mut options = NixOptions::default();
         options.set_show_trace(self.show_trace);
 
-        if let Some(machines_file) = self.machines_file().await? {
+        if let Some(machines_file) = &self.get_meta_config().await?.machines_file {
             options.set_builders(Some(format!("@{}", machines_file)));
         }
 
@@ -319,22 +325,6 @@ impl Hive {
         }
     }
 
-    /// Retrieve the machinesFile setting for the Hive.
-    async fn machines_file(&self) -> ColmenaResult<Option<String>> {
-        if let Some(machines_file) = &*self.machines_file.read().await {
-            return Ok(machines_file.clone());
-        }
-
-        let expr = "toJSON (hive.meta.machinesFile or null)";
-        let s: String = self.nix_instantiate(expr).eval()
-            .capture_json().await?;
-
-        let parsed: Option<String> = serde_json::from_str(&s).unwrap();
-        self.machines_file.write().await.replace(parsed.clone());
-
-        Ok(parsed)
-    }
-
     /// Returns the base expression from which the evaluated Hive can be used.
     fn get_base_expression(&self) -> String {
         self.assets.get_base_expression(self.path())

src/nix/hive/options.nix

@@ -282,6 +282,19 @@ with builtins; rec {
         default = {};
         type = types.attrsOf types.unspecified;
       };
+      allowApplyAll = lib.mkOption {
+        description = ''
+          Whether to allow deployments without a node filter set.
+
+          If set to false, a node filter must be specified with `--on` when
+          deploying.
+
+          It helps prevent accidental deployments to the entire cluster
+          when tags are used (e.g., `@production` and `@staging`).
+        '';
+        default = true;
+        type = types.bool;
+      };
     };
   };
 }

src/nix/hive/tests/mod.rs

@@ -542,3 +542,22 @@ fn test_hive_introspect() {
 
     assert_eq!("true", eval);
 }
+
+#[test]
+fn test_hive_get_meta() {
+  let hive = TempHive::new(r#"
+      {
+        meta.allowApplyAll = false;
+        meta.specialArgs = {
+          this_is_new = false;
+        };
+      }
+  "#);
+
+  let eval = block_on(hive.get_meta_config())
+        .unwrap();
+
+  eprintln!("{:?}", eval);
+
+  assert!(!eval.allow_apply_all);
+}

src/nix/mod.rs

@@ -82,6 +82,15 @@ pub struct NodeConfig {
     keys: HashMap<String, Key>,
 }
 
+#[derive(Debug, Clone, Validate, Deserialize)]
+pub struct MetaConfig {
+    #[serde(rename = "allowApplyAll")]
+    pub allow_apply_all: bool,
+
+    #[serde(rename = "machinesFile")]
+    pub machines_file: Option<String>,
+}
+
 /// Nix options.
 #[derive(Debug, Clone, Default)]
 pub struct NixOptions {