Rename venv-path to python

crates/red_knot/src/args.rs

@@ -41,12 +41,14 @@ pub(crate) struct CheckCommand {
     #[arg(long, value_name = "PROJECT")]
     pub(crate) project: Option<SystemPathBuf>,
 
-    /// Path to the virtual environment the project uses.
+    /// Path to the Python installation from which Red Knot resolves type information and third-party dependencies.
     ///
-    /// If provided, red-knot will use the `site-packages` directory of this virtual environment
-    /// to resolve type information for the project's third-party dependencies.
+    /// Red Knot will search in the path's `site-packages` directories for type information and
+    /// third-party imports.
+    ///
+    /// This option is commonly used to specify the path to a virtual environment.
     #[arg(long, value_name = "PATH")]
-    pub(crate) venv_path: Option<SystemPathBuf>,
+    pub(crate) python: Option<SystemPathBuf>,
 
     /// Custom directory to use for stdlib typeshed stubs.
     #[arg(long, value_name = "PATH", alias = "custom-typeshed-dir")]
@@ -97,7 +99,7 @@ impl CheckCommand {
                 python_version: self
                     .python_version
                     .map(|version| RangedValue::cli(version.into())),
-                venv_path: self.venv_path.map(RelativePathBuf::cli),
+                python: self.python.map(RelativePathBuf::cli),
                 typeshed: self.typeshed.map(RelativePathBuf::cli),
                 extra_paths: self.extra_search_path.map(|extra_search_paths| {
                     extra_search_paths

crates/red_knot/src/main.rs

@@ -16,7 +16,7 @@ use red_knot_project::{watch, Db};
 use red_knot_project::{ProjectDatabase, ProjectMetadata};
 use red_knot_server::run_server;
 use ruff_db::diagnostic::{Diagnostic, DisplayDiagnosticConfig, Severity};
-use ruff_db::system::{OsSystem, System, SystemPath, SystemPathBuf};
+use ruff_db::system::{OsSystem, SystemPath, SystemPathBuf};
 use salsa::plumbing::ZalsaDatabase;
 
 mod args;
@@ -69,7 +69,7 @@ fn run_check(args: CheckCommand) -> anyhow::Result<ExitStatus> {
     let _guard = setup_tracing(verbosity)?;
 
     // The base path to which all CLI arguments are relative to.
-    let cli_base_path = {
+    let cwd = {
         let cwd = std::env::current_dir().context("Failed to get the current working directory")?;
         SystemPathBuf::from_path_buf(cwd)
             .map_err(|path| {
@@ -80,25 +80,27 @@ fn run_check(args: CheckCommand) -> anyhow::Result<ExitStatus> {
             })?
     };
 
-    let cwd = args
+    let project_path = args
         .project
         .as_ref()
-        .map(|cwd| {
-            if cwd.as_std_path().is_dir() {
-                Ok(SystemPath::absolute(cwd, &cli_base_path))
+        .map(|project| {
+            if project.as_std_path().is_dir() {
+                Ok(SystemPath::absolute(project, &cwd))
             } else {
-                Err(anyhow!("Provided project path `{cwd}` is not a directory"))
+                Err(anyhow!(
+                    "Provided project path `{project}` is not a directory"
+                ))
             }
         })
         .transpose()?
-        .unwrap_or_else(|| cli_base_path.clone());
+        .unwrap_or_else(|| cwd.clone());
 
     let system = OsSystem::new(cwd);
     let watch = args.watch;
     let exit_zero = args.exit_zero;
 
     let cli_options = args.into_options();
-    let mut project_metadata = ProjectMetadata::discover(system.current_directory(), &system)?;
+    let mut project_metadata = ProjectMetadata::discover(&project_path, &system)?;
     project_metadata.apply_cli_options(cli_options.clone());
     project_metadata.apply_configuration_files(&system)?;
 

crates/red_knot_project/src/combine.rs

@@ -1,6 +1,6 @@
 use std::{collections::HashMap, hash::BuildHasher};
 
-use red_knot_python_semantic::{PythonPlatform, SitePackages};
+use red_knot_python_semantic::{PythonPath, PythonPlatform};
 use ruff_db::system::SystemPathBuf;
 use ruff_python_ast::PythonVersion;
 
@@ -128,7 +128,7 @@ macro_rules! impl_noop_combine {
 
 impl_noop_combine!(SystemPathBuf);
 impl_noop_combine!(PythonPlatform);
-impl_noop_combine!(SitePackages);
+impl_noop_combine!(PythonPath);
 impl_noop_combine!(PythonVersion);
 
 // std types

crates/red_knot_project/src/metadata/options.rs

@@ -1,7 +1,7 @@
 use crate::metadata::value::{RangedValue, RelativePathBuf, ValueSource, ValueSourceGuard};
 use crate::Db;
 use red_knot_python_semantic::lint::{GetLintError, Level, LintSource, RuleSelection};
-use red_knot_python_semantic::{ProgramSettings, PythonPlatform, SearchPathSettings, SitePackages};
+use red_knot_python_semantic::{ProgramSettings, PythonPath, PythonPlatform, SearchPathSettings};
 use ruff_db::diagnostic::{Diagnostic, DiagnosticId, Severity, Span};
 use ruff_db::files::system_path_to_file;
 use ruff_db::system::{System, SystemPath};
@@ -90,7 +90,7 @@ impl Options {
             .map(|env| {
                 (
                     env.extra_paths.clone(),
-                    env.venv_path.clone(),
+                    env.python.clone(),
                     env.typeshed.clone(),
                 )
             })
@@ -104,11 +104,11 @@ impl Options {
                 .collect(),
             src_roots,
             custom_typeshed: typeshed.map(|path| path.absolute(project_root, system)),
-            site_packages: python
-                .map(|venv_path| SitePackages::Derived {
-                    venv_path: venv_path.absolute(project_root, system),
+            python_path: python
+                .map(|python_path| {
+                    PythonPath::SysPrefix(python_path.absolute(project_root, system))
                 })
-                .unwrap_or(SitePackages::Known(vec![])),
+                .unwrap_or(PythonPath::KnownSitePackages(vec![])),
         }
     }
 
@@ -236,10 +236,14 @@ pub struct EnvironmentOptions {
     #[serde(skip_serializing_if = "Option::is_none")]
     pub typeshed: Option<RelativePathBuf>,
 
-    // TODO: Rename to python, see https://github.com/astral-sh/ruff/issues/15530
-    /// The path to the user's `site-packages` directory, where third-party packages from ``PyPI`` are installed.
+    /// Path to the Python installation from which Red Knot resolves type information and third-party dependencies.
+    ///
+    /// Red Knot will search in the path's `site-packages` directories for type information and
+    /// third-party imports.
+    ///
+    /// This option is commonly used to specify the path to a virtual environment.
     #[serde(skip_serializing_if = "Option::is_none")]
-    pub venv_path: Option<RelativePathBuf>,
+    pub python: Option<RelativePathBuf>,
 }
 
 #[derive(Debug, Default, Clone, Eq, PartialEq, Combine, Serialize, Deserialize)]

crates/red_knot_python_semantic/src/lib.rs

@@ -7,7 +7,7 @@ use crate::suppression::{INVALID_IGNORE_COMMENT, UNKNOWN_RULE, UNUSED_IGNORE_COM
 pub use db::Db;
 pub use module_name::ModuleName;
 pub use module_resolver::{resolve_module, system_module_search_paths, KnownModule, Module};
-pub use program::{Program, ProgramSettings, SearchPathSettings, SitePackages};
+pub use program::{Program, ProgramSettings, PythonPath, SearchPathSettings};
 pub use python_platform::PythonPlatform;
 pub use semantic_model::{HasType, SemanticModel};
 

crates/red_knot_python_semantic/src/module_resolver/resolver.rs

@@ -12,7 +12,7 @@ use crate::db::Db;
 use crate::module_name::ModuleName;
 use crate::module_resolver::typeshed::{vendored_typeshed_versions, TypeshedVersions};
 use crate::site_packages::VirtualEnvironment;
-use crate::{Program, SearchPathSettings, SitePackages};
+use crate::{Program, PythonPath, SearchPathSettings};
 
 use super::module::{Module, ModuleKind};
 use super::path::{ModulePath, SearchPath, SearchPathValidationError};
@@ -171,7 +171,7 @@ impl SearchPaths {
             extra_paths,
             src_roots,
             custom_typeshed: typeshed,
-            site_packages: site_packages_paths,
+            python_path,
         } = settings;
 
         let system = db.system();
@@ -222,16 +222,16 @@ impl SearchPaths {
 
         static_paths.push(stdlib_path);
 
-        let site_packages_paths = match site_packages_paths {
-            SitePackages::Derived { venv_path } => {
+        let site_packages_paths = match python_path {
+            PythonPath::SysPrefix(sys_prefix) => {
                 // TODO: We may want to warn here if the venv's python version is older
                 //  than the one resolved in the program settings because it indicates
                 //  that the `target-version` is incorrectly configured or that the
                 //  venv is out of date.
-                VirtualEnvironment::new(venv_path, system)
+                VirtualEnvironment::new(sys_prefix, system)
                     .and_then(|venv| venv.site_packages_directories(system))?
             }
-            SitePackages::Known(paths) => paths
+            PythonPath::KnownSitePackages(paths) => paths
                 .iter()
                 .map(|path| canonicalize(path, system))
                 .collect(),
@@ -1310,7 +1310,7 @@ mod tests {
                     extra_paths: vec![],
                     src_roots: vec![src.clone()],
                     custom_typeshed: Some(custom_typeshed),
-                    site_packages: SitePackages::Known(vec![site_packages]),
+                    python_path: PythonPath::KnownSitePackages(vec![site_packages]),
                 },
             },
         )
@@ -1816,7 +1816,7 @@ not_a_directory
                     extra_paths: vec![],
                     src_roots: vec![SystemPathBuf::from("/src")],
                     custom_typeshed: None,
-                    site_packages: SitePackages::Known(vec![
+                    python_path: PythonPath::KnownSitePackages(vec![
                         venv_site_packages,
                         system_site_packages,
                     ]),

crates/red_knot_python_semantic/src/module_resolver/testing.rs

@@ -4,7 +4,7 @@ use ruff_python_ast::PythonVersion;
 
 use crate::db::tests::TestDb;
 use crate::program::{Program, SearchPathSettings};
-use crate::{ProgramSettings, PythonPlatform, SitePackages};
+use crate::{ProgramSettings, PythonPath, PythonPlatform};
 
 /// A test case for the module resolver.
 ///
@@ -239,7 +239,7 @@ impl TestCaseBuilder<MockedTypeshed> {
                     extra_paths: vec![],
                     src_roots: vec![src.clone()],
                     custom_typeshed: Some(typeshed.clone()),
-                    site_packages: SitePackages::Known(vec![site_packages.clone()]),
+                    python_path: PythonPath::KnownSitePackages(vec![site_packages.clone()]),
                 },
             },
         )
@@ -294,7 +294,7 @@ impl TestCaseBuilder<VendoredTypeshed> {
                 python_version,
                 python_platform,
                 search_paths: SearchPathSettings {
-                    site_packages: SitePackages::Known(vec![site_packages.clone()]),
+                    python_path: PythonPath::KnownSitePackages(vec![site_packages.clone()]),
                     ..SearchPathSettings::new(vec![src.clone()])
                 },
             },

crates/red_knot_python_semantic/src/program.rs

@@ -110,8 +110,9 @@ pub struct SearchPathSettings {
     /// bundled as a zip file in the binary
     pub custom_typeshed: Option<SystemPathBuf>,
 
-    /// The path to the user's `site-packages` directory, where third-party packages from ``PyPI`` are installed.
-    pub site_packages: SitePackages,
+    /// Path to the Python installation from which Red Knot resolves third party dependencies
+    /// and their type information.
+    pub python_path: PythonPath,
 }
 
 impl SearchPathSettings {
@@ -120,17 +121,32 @@ impl SearchPathSettings {
             src_roots,
             extra_paths: vec![],
             custom_typeshed: None,
-            site_packages: SitePackages::Known(vec![]),
+            python_path: PythonPath::KnownSitePackages(vec![]),
         }
     }
 }
 
 #[derive(Debug, Clone, Eq, PartialEq)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
-pub enum SitePackages {
-    Derived {
-        venv_path: SystemPathBuf,
-    },
-    /// Resolved site packages paths
-    Known(Vec<SystemPathBuf>),
+pub enum PythonPath {
+    /// A path that represents the value of [`sys.prefix`] at runtime in Python
+    /// for a given Python executable.
+    ///
+    /// For the case of a virtual environment, where a
+    /// Python binary is at `/.venv/bin/python`, `sys.prefix` is the path to
+    /// the virtual environment the Python binary lies inside, i.e. `/.venv`,
+    /// and `site-packages` will be at `.venv/lib/python3.X/site-packages`.
+    /// System Python installations generally work the same way: if a system
+    /// Python installation lies at `/opt/homebrew/bin/python`, `sys.prefix`
+    /// will be `/opt/homebrew`, and `site-packages` will be at
+    /// `/opt/homebrew/lib/python3.X/site-packages`.
+    ///
+    /// [`sys.prefix`]: https://docs.python.org/3/library/sys.html#sys.prefix
+    SysPrefix(SystemPathBuf),
+
+    /// Resolved site packages paths.
+    ///
+    /// This variant is mainly intended for testing where we want to skip resolving `site-packages`
+    /// because it would unnecessarily complicate the test setup.
+    KnownSitePackages(Vec<SystemPathBuf>),
 }

crates/red_knot_python_semantic/src/site_packages.rs

@@ -205,11 +205,11 @@ System site-packages will not be used for module resolution.",
 
 #[derive(Debug, thiserror::Error)]
 pub(crate) enum SitePackagesDiscoveryError {
-    #[error("Invalid --venv-path argument: {0} could not be canonicalized")]
+    #[error("Invalid --python argument: `{0}` could not be canonicalized")]
     VenvDirCanonicalizationError(SystemPathBuf, #[source] io::Error),
-    #[error("Invalid --venv-path argument: {0} does not point to a directory on disk")]
+    #[error("Invalid --python argument: `{0}` does not point to a directory on disk")]
     VenvDirIsNotADirectory(SystemPathBuf),
-    #[error("--venv-path points to a broken venv with no pyvenv.cfg file")]
+    #[error("--python points to a broken venv with no pyvenv.cfg file")]
     NoPyvenvCfgFile(#[source] io::Error),
     #[error("Failed to parse the pyvenv.cfg file at {0} because {1}")]
     PyvenvCfgParseError(SystemPathBuf, PyvenvCfgParseErrorKind),

crates/red_knot_test/src/lib.rs

@@ -4,7 +4,7 @@ use camino::Utf8Path;
 use colored::Colorize;
 use parser as test_parser;
 use red_knot_python_semantic::types::check_types;
-use red_knot_python_semantic::{Program, ProgramSettings, SearchPathSettings, SitePackages};
+use red_knot_python_semantic::{Program, ProgramSettings, PythonPath, SearchPathSettings};
 use ruff_db::diagnostic::{Diagnostic, DisplayDiagnosticConfig, ParseDiagnostic};
 use ruff_db::files::{system_path_to_file, File, Files};
 use ruff_db::panic::catch_unwind;
@@ -180,7 +180,7 @@ fn run_test(
                     src_roots: vec![src_path],
                     extra_paths: vec![],
                     custom_typeshed: custom_typeshed_path,
-                    site_packages: SitePackages::Known(vec![]),
+                    python_path: PythonPath::KnownSitePackages(vec![]),
                 },
             },
         )

knot.schema.json

@@ -62,6 +62,13 @@
             "type": "string"
           }
         },
+        "python": {
+          "description": "Path to the Python installation from which Red Knot resolves type information and third-party dependencies.\n\nRed Knot will search in the path's `site-packages` directories for type information and third-party imports.\n\nThis option is commonly used to specify the path to a virtual environment.",
+          "type": [
+            "string",
+            "null"
+          ]
+        },
         "python-platform": {
           "description": "Specifies the target platform that will be used to execute the source code. If specified, Red Knot will tailor its use of type stub files, which conditionalize type definitions based on the platform.\n\nIf no platform is specified, knot will use `all` or the current platform in the LSP use case.",
           "anyOf": [
@@ -90,13 +97,6 @@
             "string",
             "null"
           ]
-        },
-        "venv-path": {
-          "description": "The path to the user's `site-packages` directory, where third-party packages from ``PyPI`` are installed.",
-          "type": [
-            "string",
-            "null"
-          ]
         }
       },
       "additionalProperties": false

scripts/knot_benchmark/src/benchmark/cases.py

@@ -75,7 +75,7 @@ def cold_command(self, project: Project, venv: Venv) -> Command:
         if project.include:
             command.extend(["--project", project.include[0]])
 
-        command.extend(["--venv-path", str(venv.path)])
+        command.extend(["--python", str(venv.path)])
 
         return Command(
             name="knot",