Discover workspaces without using them in resolution (#3585)

Add minimal support for workspace discovery, only used for determining
paths in the bluejay commands.

We can now discover the workspace structure, namely that the
`pyproject.toml` of a package belongs to a workspace `pyproject.toml`
with members and exclusion. The globbing logic is inspired by cargo. We
don't resolve `workspace = true` metadata declarations yet.

Cargo.lock

@@ -4955,6 +4955,7 @@ dependencies = [
  "pep440_rs",
  "pep508_rs",
  "pypi-types",
+ "regex",
  "requirements-txt",
  "rustc-hash",
  "schemars",

crates/uv-requirements/Cargo.toml

@@ -50,7 +50,8 @@ schemars = ["dep:schemars"]
 
 [dev-dependencies]
 indoc = "2.0.5"
-insta = "1.38.0"
+insta = { version = "1.38.0", features = ["filters", "redactions", "json"] }
+regex = { workspace = true }
 
 [lints]
 workspace = true

crates/uv-requirements/src/lib.rs

@@ -3,6 +3,7 @@ pub use crate::source_tree::*;
 pub use crate::sources::*;
 pub use crate::specification::*;
 pub use crate::unnamed::*;
+pub use crate::workspace::*;
 
 mod confirm;
 mod lookahead;
@@ -12,3 +13,4 @@ mod sources;
 mod specification;
 mod unnamed;
 pub mod upgrade;
+mod workspace;

crates/uv-requirements/src/pyproject.rs

@@ -1,4 +1,4 @@
-//! Reads the following fields from from `pyproject.toml`:
+//! Reads the following fields from `pyproject.toml`:
 //!
 //! * `project.{dependencies,optional-dependencies}`
 //! * `tool.uv.sources`
@@ -6,7 +6,7 @@
 //!
 //! Then lowers them into a dependency specification.
 
-use std::collections::HashMap;
+use std::collections::BTreeMap;
 use std::io;
 use std::ops::Deref;
 use std::path::{Path, PathBuf};
@@ -110,7 +110,7 @@ pub struct Tool {
 #[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq)]
 #[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
 pub struct ToolUv {
-    pub sources: Option<HashMap<PackageName, Source>>,
+    pub sources: Option<BTreeMap<PackageName, Source>>,
     pub workspace: Option<ToolUvWorkspace>,
 }
 
@@ -238,8 +238,8 @@ impl Pep621Metadata {
         extras: &ExtrasSpecification,
         pyproject_path: &Path,
         project_dir: &Path,
-        workspace_sources: &HashMap<PackageName, Source>,
+        workspace_sources: &BTreeMap<PackageName, Source>,
-        workspace_packages: &HashMap<PackageName, String>,
+        workspace_packages: &BTreeMap<PackageName, String>,
         preview: PreviewMode,
     ) -> Result<Option<Self>, Pep621Error> {
         let project_sources = pyproject
@@ -323,9 +323,9 @@ pub(crate) fn lower_requirements(
     pyproject_path: &Path,
     project_name: &PackageName,
     project_dir: &Path,
-    project_sources: &HashMap<PackageName, Source>,
+    project_sources: &BTreeMap<PackageName, Source>,
-    workspace_sources: &HashMap<PackageName, Source>,
+    workspace_sources: &BTreeMap<PackageName, Source>,
-    workspace_packages: &HashMap<PackageName, String>,
+    workspace_packages: &BTreeMap<PackageName, String>,
     preview: PreviewMode,
 ) -> Result<Requirements, Pep621Error> {
     let dependencies = dependencies
@@ -386,9 +386,9 @@ pub(crate) fn lower_requirement(
     requirement: pep508_rs::Requirement,
     project_name: &PackageName,
     project_dir: &Path,
-    project_sources: &HashMap<PackageName, Source>,
+    project_sources: &BTreeMap<PackageName, Source>,
-    workspace_sources: &HashMap<PackageName, Source>,
+    workspace_sources: &BTreeMap<PackageName, Source>,
-    workspace_packages: &HashMap<PackageName, String>,
+    workspace_packages: &BTreeMap<PackageName, String>,
     preview: PreviewMode,
 ) -> Result<Requirement, LoweringError> {
     let source = project_sources

crates/uv-requirements/src/specification.rs

@@ -1,4 +1,4 @@
-use std::collections::HashMap;
+use std::collections::BTreeMap;
 use std::path::{Path, PathBuf};
 
 use anyhow::{Context, Result};
@@ -165,8 +165,8 @@ impl RequirementsSpecification {
             .parent()
             .context("`pyproject.toml` has no parent directory")?;
 
-        let workspace_sources = HashMap::default();
+        let workspace_sources = BTreeMap::default();
-        let workspace_packages = HashMap::default();
+        let workspace_packages = BTreeMap::default();
         match Pep621Metadata::try_from(
             pyproject,
             extras,

crates/uv-requirements/src/workspace.rs

@@ -0,0 +1,705 @@
+//! Resolve the current [`ProjectWorkspace`].
+
+use std::collections::BTreeMap;
+use std::path::{Path, PathBuf};
+
+use glob::{glob, GlobError, PatternError};
+use tracing::{debug, trace};
+
+use uv_fs::Simplified;
+use uv_normalize::PackageName;
+use uv_warnings::warn_user;
+
+use crate::pyproject::{PyProjectToml, Source, ToolUvWorkspace};
+use crate::RequirementsSource;
+
+#[derive(thiserror::Error, Debug)]
+pub enum WorkspaceError {
+    #[error("No `pyproject.toml` found in current directory or any parent directory")]
+    MissingPyprojectToml,
+    #[error("Failed to find directories for glob: `{0}`")]
+    Pattern(String, #[source] PatternError),
+    #[error("Invalid glob in `tool.uv.workspace.members`: `{0}`")]
+    Glob(String, #[source] GlobError),
+    #[error(transparent)]
+    Io(#[from] std::io::Error),
+    #[error("Failed to parse: `{}`", _0.user_display())]
+    Toml(PathBuf, #[source] toml::de::Error),
+    #[error("No `project` section found in: `{}`", _0.simplified_display())]
+    MissingProject(PathBuf),
+}
+
+/// A workspace, consisting of a root directory and members. See [`ProjectWorkspace`].
+#[derive(Debug, Clone)]
+#[cfg_attr(test, derive(serde::Serialize))]
+pub struct Workspace {
+    /// The path to the workspace root, the directory containing the top level `pyproject.toml` with
+    /// the `uv.tool.workspace`, or the `pyproject.toml` in an implicit single workspace project.
+    root: PathBuf,
+    /// The members of the workspace.
+    packages: BTreeMap<PackageName, WorkspaceMember>,
+    /// The sources table from the workspace `pyproject.toml`. It is overridden by the project
+    /// sources.
+    sources: BTreeMap<PackageName, Source>,
+}
+
+impl Workspace {
+    /// The path to the workspace root, the directory containing the top level `pyproject.toml` with
+    /// the `uv.tool.workspace`, or the `pyproject.toml` in an implicit single workspace project.
+    pub fn root(&self) -> &PathBuf {
+        &self.root
+    }
+
+    /// The members of the workspace.
+    pub fn packages(&self) -> &BTreeMap<PackageName, WorkspaceMember> {
+        &self.packages
+    }
+
+    /// The sources table from the workspace `pyproject.toml`.
+    pub fn sources(&self) -> &BTreeMap<PackageName, Source> {
+        &self.sources
+    }
+}
+
+/// A project in a workspace.
+#[derive(Debug, Clone)]
+#[cfg_attr(test, derive(serde::Serialize))]
+pub struct WorkspaceMember {
+    /// The path to the project root.
+    root: PathBuf,
+    /// The `pyproject.toml` of the project, found at `<root>/pyproject.toml`.
+    pyproject_toml: PyProjectToml,
+}
+
+impl WorkspaceMember {
+    /// The path to the project root.
+    pub fn root(&self) -> &PathBuf {
+        &self.root
+    }
+
+    /// The `pyproject.toml` of the project, found at `<root>/pyproject.toml`.
+    pub fn pyproject_toml(&self) -> &PyProjectToml {
+        &self.pyproject_toml
+    }
+}
+
+/// The current project and the workspace it is part of, with all of the workspace members.
+///
+/// # Structure
+///
+/// The workspace root is a directory with a `pyproject.toml`, all members need to be below that
+/// directory. The workspace root defines members and exclusions. All packages below it must either
+/// be a member or excluded. The workspace root can be a package itself or a virtual manifest.
+///
+/// For a simple single package project, the workspace root is implicitly the current project root
+/// and the workspace has only this single member. Otherwise, a workspace root is declared through
+/// a `tool.uv.workspace` section.
+///
+/// A workspace itself does not declare dependencies, instead one member is the current project used
+/// as main requirement.
+///
+/// Each member is a directory with a `pyproject.toml` that contains a `[project]` section. Each
+/// member is a Python package, with a name, a version and dependencies. Workspace members can
+/// depend on other workspace members (`foo = { workspace = true }`). You can consider the
+/// workspace another package source or index, similar to `--find-links`.
+///
+/// # Usage
+///
+/// There a two main usage patterns: A root package and helpers, and the flat workspace.
+///
+/// Root package and helpers:
+///
+/// ```text
+/// albatross
+/// ├── packages
+/// │   ├── provider_a
+/// │   │   ├── pyproject.toml
+/// │   │   └── src
+/// │   │       └── provider_a
+/// │   │           ├── __init__.py
+/// │   │           └── foo.py
+/// │   └── provider_b
+/// │       ├── pyproject.toml
+/// │       └── src
+/// │           └── provider_b
+/// │               ├── __init__.py
+/// │               └── bar.py
+/// ├── pyproject.toml
+/// ├── Readme.md
+/// ├── uv.lock
+/// └── src
+///     └── albatross
+///         ├── __init__.py
+///         └── main.py
+/// ```
+///
+/// Flat workspace:
+///
+/// ```text
+/// albatross
+/// ├── packages
+/// │   ├── albatross
+/// │   │   ├── pyproject.toml
+/// │   │   └── src
+/// │   │       └── albatross
+/// │   │           ├── __init__.py
+/// │   │           └── main.py
+/// │   ├── provider_a
+/// │   │   ├── pyproject.toml
+/// │   │   └── src
+/// │   │       └── provider_a
+/// │   │           ├── __init__.py
+/// │   │           └── foo.py
+/// │   └── provider_b
+/// │       ├── pyproject.toml
+/// │       └── src
+/// │           └── provider_b
+/// │               ├── __init__.py
+/// │               └── bar.py
+/// ├── pyproject.toml
+/// ├── Readme.md
+/// └── uv.lock
+/// ```
+#[derive(Debug, Clone)]
+#[cfg_attr(test, derive(serde::Serialize))]
+pub struct ProjectWorkspace {
+    /// The path to the project root.
+    project_root: PathBuf,
+    /// The name of the package.
+    project_name: PackageName,
+    /// The workspace the project is part of.
+    workspace: Workspace,
+}
+
+impl ProjectWorkspace {
+    /// Find the current project and workspace.
+    pub fn discover(path: impl AsRef<Path>) -> Result<Self, WorkspaceError> {
+        let Some(project_root) = path
+            .as_ref()
+            .ancestors()
+            .find(|path| path.join("pyproject.toml").is_file())
+        else {
+            return Err(WorkspaceError::MissingPyprojectToml);
+        };
+
+        debug!(
+            "Found project root: `{}`",
+            project_root.simplified_display()
+        );
+
+        Self::from_project_root(project_root)
+    }
+
+    /// The directory containing the closest `pyproject.toml`, defining the current project.
+    pub fn project_root(&self) -> &Path {
+        &self.project_root
+    }
+
+    /// The name of the current project.
+    pub fn project_name(&self) -> &PackageName {
+        &self.project_name
+    }
+
+    /// The workspace definition.
+    pub fn workspace(&self) -> &Workspace {
+        &self.workspace
+    }
+
+    /// Return the requirements for the project.
+    pub fn requirements(&self) -> Vec<RequirementsSource> {
+        vec![
+            RequirementsSource::from_requirements_file(self.project_root.join("pyproject.toml")),
+            RequirementsSource::from_source_tree(self.project_root.clone()),
+        ]
+    }
+
+    fn from_project_root(path: &Path) -> Result<Self, WorkspaceError> {
+        let pyproject_path = path.join("pyproject.toml");
+
+        // Read the `pyproject.toml`.
+        let contents = fs_err::read_to_string(&pyproject_path)?;
+        let pyproject_toml: PyProjectToml = toml::from_str(&contents)
+            .map_err(|err| WorkspaceError::Toml(pyproject_path.clone(), err))?;
+
+        // Extract the `[project]` metadata.
+        let Some(project) = pyproject_toml.project.clone() else {
+            return Err(WorkspaceError::MissingProject(pyproject_path));
+        };
+
+        Self::from_project(path.to_path_buf(), &pyproject_toml, project.name)
+    }
+
+    /// Find the workspace for a project.
+    fn from_project(
+        project_path: PathBuf,
+        project: &PyProjectToml,
+        project_name: PackageName,
+    ) -> Result<Self, WorkspaceError> {
+        let mut workspace = project
+            .tool
+            .as_ref()
+            .and_then(|tool| tool.uv.as_ref())
+            .and_then(|uv| uv.workspace.as_ref())
+            .map(|workspace| (project_path.clone(), workspace.clone(), project.clone()));
+
+        if workspace.is_none() {
+            workspace = find_workspace(&project_path)?;
+        }
+
+        let mut workspace_members = BTreeMap::new();
+        workspace_members.insert(
+            project_name.clone(),
+            WorkspaceMember {
+                root: project_path.clone(),
+                pyproject_toml: project.clone(),
+            },
+        );
+
+        let Some((workspace_root, workspace_definition, project_in_workspace_root)) = workspace
+        else {
+            // The project and the workspace root are identical
+            debug!("No workspace root found, using project root");
+            return Ok(Self {
+                project_root: project_path.clone(),
+                project_name,
+                workspace: Workspace {
+                    root: project_path,
+                    packages: workspace_members,
+                    // There may be package sources, but we don't need to duplicate them into the
+                    // workspace sources.
+                    sources: BTreeMap::default(),
+                },
+            });
+        };
+
+        debug!(
+            "Found workspace root: `{}`",
+            workspace_root.simplified_display()
+        );
+        if workspace_root != project_path {
+            let pyproject_path = workspace_root.join("pyproject.toml");
+            let contents = fs_err::read_to_string(&pyproject_path)?;
+            let pyproject_toml = toml::from_str(&contents)
+                .map_err(|err| WorkspaceError::Toml(pyproject_path, err))?;
+
+            if let Some(project) = &project_in_workspace_root.project {
+                workspace_members.insert(
+                    project.name.clone(),
+                    WorkspaceMember {
+                        root: workspace_root.clone(),
+                        pyproject_toml,
+                    },
+                );
+            };
+        }
+        for member_glob in workspace_definition.members.unwrap_or_default() {
+            let absolute_glob = workspace_root
+                .join(member_glob.as_str())
+                .to_string_lossy()
+                .to_string();
+            for member_root in glob(&absolute_glob)
+                .map_err(|err| WorkspaceError::Pattern(absolute_glob.to_string(), err))?
+            {
+                // TODO(konsti): Filter already seen.
+                let member_root = member_root
+                    .map_err(|err| WorkspaceError::Glob(absolute_glob.to_string(), err))?;
+                // Read the `pyproject.toml`.
+                let pyproject_path = member_root.join("pyproject.toml");
+                let contents = fs_err::read_to_string(&pyproject_path)?;
+                let pyproject_toml: PyProjectToml = toml::from_str(&contents)
+                    .map_err(|err| WorkspaceError::Toml(pyproject_path, err))?;
+
+                // Extract the package name.
+                let Some(project) = pyproject_toml.project.clone() else {
+                    return Err(WorkspaceError::MissingProject(member_root));
+                };
+
+                let pyproject_toml = workspace_root.join("pyproject.toml");
+                let contents = fs_err::read_to_string(&pyproject_toml)?;
+                let pyproject_toml = toml::from_str(&contents)
+                    .map_err(|err| WorkspaceError::Toml(pyproject_toml, err))?;
+                let member = WorkspaceMember {
+                    root: member_root.clone(),
+                    pyproject_toml,
+                };
+                workspace_members.insert(project.name, member);
+            }
+        }
+        let workspace_sources = project_in_workspace_root
+            .tool
+            .as_ref()
+            .and_then(|tool| tool.uv.as_ref())
+            .and_then(|uv| uv.sources.clone())
+            .unwrap_or_default();
+
+        check_nested_workspaces(&workspace_root);
+
+        Ok(Self {
+            project_root: project_path.clone(),
+            project_name,
+            workspace: Workspace {
+                root: workspace_root,
+                packages: workspace_members,
+                sources: workspace_sources,
+            },
+        })
+    }
+}
+
+/// Find the workspace root above the current project, if any.
+fn find_workspace(
+    project_root: &Path,
+) -> Result<Option<(PathBuf, ToolUvWorkspace, PyProjectToml)>, WorkspaceError> {
+    // Skip 1 to ignore the current project itself.
+    for workspace_root in project_root.ancestors().skip(1) {
+        let pyproject_path = workspace_root.join("pyproject.toml");
+        if !pyproject_path.is_file() {
+            continue;
+        }
+        trace!(
+            "Found pyproject.toml: {}",
+            pyproject_path.simplified_display()
+        );
+
+        // Read the `pyproject.toml`.
+        let contents = fs_err::read_to_string(&pyproject_path)?;
+        let pyproject_toml: PyProjectToml = toml::from_str(&contents)
+            .map_err(|err| WorkspaceError::Toml(pyproject_path.clone(), err))?;
+
+        return if let Some(workspace) = pyproject_toml
+            .tool
+            .as_ref()
+            .and_then(|tool| tool.uv.as_ref())
+            .and_then(|uv| uv.workspace.as_ref())
+        {
+            if is_excluded_from_workspace(project_root, workspace_root, workspace)? {
+                debug!(
+                    "Found workspace root `{}`, but project is excluded.",
+                    workspace_root.simplified_display()
+                );
+                return Ok(None);
+            }
+
+            // We found a workspace root.
+            Ok(Some((
+                workspace_root.to_path_buf(),
+                workspace.clone(),
+                pyproject_toml,
+            )))
+        } else if pyproject_toml.project.is_some() {
+            // We're in a directory of another project, e.g. tests or examples.
+            // Example:
+            // ```
+            // albatross
+            // ├── examples
+            // │   └── bird-feeder [CURRENT DIRECTORY]
+            // │       ├── pyproject.toml
+            // │       └── src
+            // │           └── bird_feeder
+            // │               └── __init__.py
+            // ├── pyproject.toml
+            // └── src
+            //     └── albatross
+            //         └── __init__.py
+            // ```
+            // The current project is the example (non-workspace) `bird-feeder` in `albatross`,
+            // we ignore all `albatross` is doing and any potential workspace it might be
+            // contained in.
+            debug!(
+                "Project is contained in non-workspace project: `{}`",
+                workspace_root.simplified_display()
+            );
+            Ok(None)
+        } else {
+            // We require that a `project.toml` file either declares a workspace or a project.
+            warn_user!(
+                "pyproject.toml does not contain `project` table: `{}`",
+                workspace_root.simplified_display()
+            );
+            Ok(None)
+        };
+    }
+
+    Ok(None)
+}
+
+/// Warn when the valid workspace is included in another workspace.
+fn check_nested_workspaces(inner_workspace_root: &Path) {
+    for outer_workspace_root in inner_workspace_root.ancestors().skip(1) {
+        let pyproject_toml_path = outer_workspace_root.join("pyproject.toml");
+        if !pyproject_toml_path.is_file() {
+            continue;
+        }
+        let contents = match fs_err::read_to_string(&pyproject_toml_path) {
+            Ok(contents) => contents,
+            Err(err) => {
+                warn_user!(
+                    "Unreadable pyproject.toml `{}`: {}",
+                    pyproject_toml_path.user_display(),
+                    err
+                );
+                return;
+            }
+        };
+        let pyproject_toml: PyProjectToml = match toml::from_str(&contents) {
+            Ok(contents) => contents,
+            Err(err) => {
+                warn_user!(
+                    "Invalid pyproject.toml `{}`: {}",
+                    pyproject_toml_path.user_display(),
+                    err
+                );
+                return;
+            }
+        };
+
+        if let Some(workspace) = pyproject_toml
+            .tool
+            .as_ref()
+            .and_then(|tool| tool.uv.as_ref())
+            .and_then(|uv| uv.workspace.as_ref())
+        {
+            let is_excluded = match is_excluded_from_workspace(
+                inner_workspace_root,
+                outer_workspace_root,
+                workspace,
+            ) {
+                Ok(contents) => contents,
+                Err(err) => {
+                    warn_user!(
+                        "Invalid pyproject.toml `{}`: {}",
+                        pyproject_toml_path.user_display(),
+                        err
+                    );
+                    return;
+                }
+            };
+            if !is_excluded {
+                warn_user!(
+                    "Outer workspace including existing workspace, nested workspaces are not supported: `{}`",
+                    pyproject_toml_path.user_display(),
+                );
+            }
+        }
+
+        // We're in the examples or tests of another project (not a workspace), this is fine.
+        return;
+    }
+}
+
+/// Check if we're in the `tool.uv.workspace.excluded` of a workspace.
+fn is_excluded_from_workspace(
+    project_path: &Path,
+    workspace_root: &Path,
+    workspace: &ToolUvWorkspace,
+) -> Result<bool, WorkspaceError> {
+    for exclude_glob in workspace.exclude.iter().flatten() {
+        let absolute_glob = workspace_root
+            .join(exclude_glob.as_str())
+            .to_string_lossy()
+            .to_string();
+        for excluded_root in glob(&absolute_glob)
+            .map_err(|err| WorkspaceError::Pattern(absolute_glob.to_string(), err))?
+        {
+            let excluded_root = excluded_root
+                .map_err(|err| WorkspaceError::Glob(absolute_glob.to_string(), err))?;
+            if excluded_root == project_path {
+                return Ok(true);
+            }
+        }
+    }
+    Ok(false)
+}
+
+#[cfg(test)]
+#[cfg(unix)] // Avoid path escaping for the unit tests
+mod tests {
+    use std::env;
+    use std::path::Path;
+
+    use insta::assert_json_snapshot;
+
+    use crate::workspace::ProjectWorkspace;
+
+    fn workspace_test(folder: impl AsRef<Path>) -> (ProjectWorkspace, String) {
+        let root_dir = env::current_dir()
+            .unwrap()
+            .parent()
+            .unwrap()
+            .parent()
+            .unwrap()
+            .join("scripts")
+            .join("workspaces");
+        let project = ProjectWorkspace::discover(root_dir.join(folder)).unwrap();
+        let root_escaped = regex::escape(root_dir.to_string_lossy().as_ref());
+        (project, root_escaped)
+    }
+
+    #[test]
+    fn albatross_in_example() {
+        let (project, root_escaped) = workspace_test("albatross-in-example/examples/bird-feeder");
+        let filters = vec![(root_escaped.as_str(), "[ROOT]")];
+        insta::with_settings!({filters => filters}, {
+        assert_json_snapshot!(
+            project,
+            {
+                ".workspace.packages.*.pyproject_toml" => "[PYPROJECT_TOML]"
+            },
+            @r###"
+        {
+          "project_root": "[ROOT]/albatross-in-example/examples/bird-feeder",
+          "project_name": "bird-feeder",
+          "workspace": {
+            "root": "[ROOT]/albatross-in-example/examples/bird-feeder",
+            "packages": {
+              "bird-feeder": {
+                "root": "[ROOT]/albatross-in-example/examples/bird-feeder",
+                "pyproject_toml": "[PYPROJECT_TOML]"
+              }
+            },
+            "sources": {}
+          }
+        }
+        "###);
+        });
+    }
+
+    #[test]
+    fn albatross_project_in_excluded() {
+        let (project, root_escaped) =
+            workspace_test("albatross-project-in-excluded/excluded/bird-feeder");
+        let filters = vec![(root_escaped.as_str(), "[ROOT]")];
+        insta::with_settings!({filters => filters}, {
+            assert_json_snapshot!(
+            project,
+            {
+                ".workspace.packages.*.pyproject_toml" => "[PYPROJECT_TOML]"
+            },
+            @r###"
+            {
+              "project_root": "[ROOT]/albatross-project-in-excluded/excluded/bird-feeder",
+              "project_name": "bird-feeder",
+              "workspace": {
+                "root": "[ROOT]/albatross-project-in-excluded/excluded/bird-feeder",
+                "packages": {
+                  "bird-feeder": {
+                    "root": "[ROOT]/albatross-project-in-excluded/excluded/bird-feeder",
+                    "pyproject_toml": "[PYPROJECT_TOML]"
+                  }
+                },
+                "sources": {}
+              }
+            }
+            "###);
+        });
+    }
+
+    #[test]
+    fn albatross_root_workspace() {
+        let (project, root_escaped) = workspace_test("albatross-root-workspace");
+        let filters = vec![(root_escaped.as_str(), "[ROOT]")];
+        insta::with_settings!({filters => filters}, {
+            assert_json_snapshot!(
+            project,
+            {
+                ".workspace.packages.*.pyproject_toml" => "[PYPROJECT_TOML]"
+            },
+            @r###"
+            {
+              "project_root": "[ROOT]/albatross-root-workspace",
+              "project_name": "albatross",
+              "workspace": {
+                "root": "[ROOT]/albatross-root-workspace",
+                "packages": {
+                  "albatross": {
+                    "root": "[ROOT]/albatross-root-workspace",
+                    "pyproject_toml": "[PYPROJECT_TOML]"
+                  },
+                  "bird-feeder": {
+                    "root": "[ROOT]/albatross-root-workspace/packages/bird-feeder",
+                    "pyproject_toml": "[PYPROJECT_TOML]"
+                  },
+                  "seeds": {
+                    "root": "[ROOT]/albatross-root-workspace/packages/seeds",
+                    "pyproject_toml": "[PYPROJECT_TOML]"
+                  }
+                },
+                "sources": {
+                  "bird-feeder": {
+                    "workspace": true,
+                    "editable": null
+                  }
+                }
+              }
+            }
+            "###);
+        });
+    }
+
+    #[test]
+    fn albatross_virtual_workspace() {
+        let (project, root_escaped) =
+            workspace_test("albatross-virtual-workspace/packages/albatross");
+        let filters = vec![(root_escaped.as_str(), "[ROOT]")];
+        insta::with_settings!({filters => filters}, {
+            assert_json_snapshot!(
+            project,
+            {
+                ".workspace.packages.*.pyproject_toml" => "[PYPROJECT_TOML]"
+            },
+            @r###"
+            {
+              "project_root": "[ROOT]/albatross-virtual-workspace/packages/albatross",
+              "project_name": "albatross",
+              "workspace": {
+                "root": "[ROOT]/albatross-virtual-workspace",
+                "packages": {
+                  "albatross": {
+                    "root": "[ROOT]/albatross-virtual-workspace/packages/albatross",
+                    "pyproject_toml": "[PYPROJECT_TOML]"
+                  },
+                  "bird-feeder": {
+                    "root": "[ROOT]/albatross-virtual-workspace/packages/bird-feeder",
+                    "pyproject_toml": "[PYPROJECT_TOML]"
+                  },
+                  "seeds": {
+                    "root": "[ROOT]/albatross-virtual-workspace/packages/seeds",
+                    "pyproject_toml": "[PYPROJECT_TOML]"
+                  }
+                },
+                "sources": {}
+              }
+            }
+            "###);
+        });
+    }
+
+    #[test]
+    fn albatross_just_project() {
+        let (project, root_escaped) = workspace_test("albatross-just-project");
+        let filters = vec![(root_escaped.as_str(), "[ROOT]")];
+        insta::with_settings!({filters => filters}, {
+            assert_json_snapshot!(
+            project,
+            {
+                ".workspace.packages.*.pyproject_toml" => "[PYPROJECT_TOML]"
+            },
+            @r###"
+            {
+              "project_root": "[ROOT]/albatross-just-project",
+              "project_name": "albatross",
+              "workspace": {
+                "root": "[ROOT]/albatross-just-project",
+                "packages": {
+                  "albatross": {
+                    "root": "[ROOT]/albatross-just-project",
+                    "pyproject_toml": "[PYPROJECT_TOML]"
+                  }
+                },
+                "sources": {}
+              }
+            }
+            "###);
+        });
+    }
+}

crates/uv/src/commands/project/discovery.rs

@@ -1,99 +0,0 @@
-use serde::Deserialize;
-use std::path::{Path, PathBuf};
-
-use tracing::debug;
-use uv_fs::Simplified;
-use uv_normalize::PackageName;
-
-use uv_requirements::RequirementsSource;
-
-#[derive(thiserror::Error, Debug)]
-pub(crate) enum ProjectError {
-    #[error(transparent)]
-    Io(#[from] std::io::Error),
-
-    #[error(transparent)]
-    Toml(#[from] toml::de::Error),
-
-    #[error("No `project` section found in: {}", _0.user_display())]
-    MissingProject(PathBuf),
-
-    #[error("No `name` found in `project` section in: {}", _0.user_display())]
-    MissingName(PathBuf),
-}
-
-#[derive(Debug, Clone)]
-pub(crate) struct Project {
-    /// The name of the package.
-    name: PackageName,
-    /// The path to the `pyproject.toml` file.
-    path: PathBuf,
-    /// The path to the project root.
-    root: PathBuf,
-}
-
-impl Project {
-    /// Find the current project.
-    pub(crate) fn find(path: impl AsRef<Path>) -> Result<Option<Self>, ProjectError> {
-        for ancestor in path.as_ref().ancestors() {
-            let pyproject_path = ancestor.join("pyproject.toml");
-            if pyproject_path.exists() {
-                debug!(
-                    "Loading requirements from: {}",
-                    pyproject_path.user_display()
-                );
-
-                // Read the `pyproject.toml`.
-                let contents = fs_err::read_to_string(&pyproject_path)?;
-                let pyproject_toml: PyProjectToml = toml::from_str(&contents)?;
-
-                // Extract the package name.
-                let Some(project) = pyproject_toml.project else {
-                    return Err(ProjectError::MissingProject(pyproject_path));
-                };
-                let Some(name) = project.name else {
-                    return Err(ProjectError::MissingName(pyproject_path));
-                };
-
-                return Ok(Some(Self {
-                    name,
-                    path: pyproject_path,
-                    root: ancestor.to_path_buf(),
-                }));
-            }
-        }
-
-        Ok(None)
-    }
-
-    /// Return the [`PackageName`] for the project.
-    pub(crate) fn name(&self) -> &PackageName {
-        &self.name
-    }
-
-    /// Return the root path for the project.
-    pub(crate) fn root(&self) -> &Path {
-        &self.root
-    }
-
-    /// Return the requirements for the project.
-    pub(crate) fn requirements(&self) -> Vec<RequirementsSource> {
-        vec![
-            RequirementsSource::from_requirements_file(self.path.clone()),
-            RequirementsSource::from_source_tree(self.root.clone()),
-        ]
-    }
-}
-
-/// A pyproject.toml as specified in PEP 517.
-#[derive(Deserialize, Debug)]
-#[serde(rename_all = "kebab-case")]
-struct PyProjectToml {
-    project: Option<PyProjectProject>,
-}
-
-#[derive(Deserialize, Debug)]
-#[serde(rename_all = "kebab-case")]
-struct PyProjectProject {
-    name: Option<PackageName>,
-}

crates/uv/src/commands/project/lock.rs

@@ -9,12 +9,11 @@ use uv_configuration::{
     Concurrency, ConfigSettings, NoBinary, NoBuild, PreviewMode, Reinstall, SetupPyStrategy,
 };
 use uv_dispatch::BuildDispatch;
-use uv_requirements::{ExtrasSpecification, RequirementsSpecification};
+use uv_requirements::{ExtrasSpecification, ProjectWorkspace, RequirementsSpecification};
 use uv_resolver::{FlatIndex, InMemoryIndex, OptionsBuilder};
 use uv_types::{BuildIsolation, EmptyInstalledPackages, HashStrategy, InFlight};
 use uv_warnings::warn_user;
 
-use crate::commands::project::discovery::Project;
 use crate::commands::project::Error;
 use crate::commands::{project, ExitStatus};
 use crate::editables::ResolvedEditables;
@@ -32,11 +31,7 @@ pub(crate) async fn lock(
     }
 
     // Find the project requirements.
-    let Some(project) = Project::find(std::env::current_dir()?)? else {
+    let project = ProjectWorkspace::discover(std::env::current_dir()?)?;
-        return Err(anyhow::anyhow!(
-            "Unable to find `pyproject.toml` for project."
-        ));
-    };
 
     // Discover or create the virtual environment.
     let venv = project::init(&project, cache, printer)?;
@@ -111,7 +106,8 @@ pub(crate) async fn lock(
         .build();
 
     // Build all editable distributions. The editables are shared between resolution and
-    // installation, and should live for the duration of the command.
+    // installation, and should live for the duration of the command. If an editable is already
+    // installed in the environment, we'll still re-build it here.
     let editables = ResolvedEditables::resolve(
         spec.editables.clone(),
         &EmptyInstalledPackages,
@@ -159,7 +155,11 @@ pub(crate) async fn lock(
     // Write the lockfile to disk.
     let lock = resolution.lock()?;
     let encoded = toml::to_string_pretty(&lock)?;
-    fs_err::tokio::write(project.root().join("uv.lock"), encoded.as_bytes()).await?;
+    fs_err::tokio::write(
+        project.workspace().root().join("uv.lock"),
+        encoded.as_bytes(),
+    )
+    .await?;
 
     Ok(ExitStatus::Success)
 }

crates/uv/src/commands/project/mod.rs

@@ -22,8 +22,8 @@ use uv_fs::Simplified;
 use uv_installer::{Downloader, Plan, Planner, SatisfiesResult, SitePackages};
 use uv_interpreter::{find_default_python, Interpreter, PythonEnvironment};
 use uv_requirements::{
-    ExtrasSpecification, LookaheadResolver, NamedRequirementsResolver, RequirementsSource,
+    ExtrasSpecification, LookaheadResolver, NamedRequirementsResolver, ProjectWorkspace,
-    RequirementsSpecification, SourceTreeResolver,
+    RequirementsSource, RequirementsSpecification, SourceTreeResolver,
 };
 use uv_resolver::{
     Exclusions, FlatIndex, InMemoryIndex, Manifest, Options, OptionsBuilder, PythonRequirement,
@@ -31,13 +31,11 @@ use uv_resolver::{
 };
 use uv_types::{BuildIsolation, HashStrategy, InFlight, InstalledPackagesProvider};
 
-use crate::commands::project::discovery::Project;
 use crate::commands::reporters::{DownloadReporter, InstallReporter, ResolverReporter};
 use crate::commands::{elapsed, ChangeEvent, ChangeEventKind};
 use crate::editables::ResolvedEditables;
 use crate::printer::Printer;
 
-mod discovery;
 pub(crate) mod lock;
 pub(crate) mod run;
 pub(crate) mod sync;
@@ -80,11 +78,11 @@ pub(crate) enum Error {
 
 /// Initialize a virtual environment for the current project.
 pub(crate) fn init(
-    project: &Project,
+    project: &ProjectWorkspace,
     cache: &Cache,
     printer: Printer,
 ) -> Result<PythonEnvironment, Error> {
-    let venv = project.root().join(".venv");
+    let venv = project.workspace().root().join(".venv");
 
     // Discover or create the virtual environment.
     // TODO(charlie): If the environment isn't compatible with `--python`, recreate it.
@@ -165,7 +163,7 @@ pub(crate) async fn resolve<InstalledPackages: InstalledPackagesProvider>(
     let requirements = {
         // Convert from unnamed to named requirements.
         let mut requirements = NamedRequirementsResolver::new(
-            requirements,
+            requirements.clone(),
             hasher,
             index,
             DistributionDatabase::new(client, build_dispatch, concurrency.downloads),
@@ -178,7 +176,7 @@ pub(crate) async fn resolve<InstalledPackages: InstalledPackagesProvider>(
         if !source_trees.is_empty() {
             requirements.extend(
                 SourceTreeResolver::new(
-                    source_trees,
+                    source_trees.clone(),
                     &ExtrasSpecification::None,
                     hasher,
                     index,
@@ -214,7 +212,7 @@ pub(crate) async fn resolve<InstalledPackages: InstalledPackagesProvider>(
         constraints,
         overrides,
         preferences,
-        project,
+        project.clone(),
         editable_metadata,
         exclusions,
         lookaheads,

crates/uv/src/commands/project/run.rs

@@ -10,10 +10,9 @@ use tracing::debug;
 use uv_cache::Cache;
 use uv_configuration::PreviewMode;
 use uv_interpreter::PythonEnvironment;
-use uv_requirements::RequirementsSource;
+use uv_requirements::{ProjectWorkspace, RequirementsSource};
 use uv_warnings::warn_user;
 
-use crate::commands::project::discovery::Project;
 use crate::commands::{project, ExitStatus};
 use crate::printer::Printer;
 
@@ -55,11 +54,7 @@ pub(crate) async fn run(
     } else {
         debug!("Syncing project environment.");
 
-        let Some(project) = Project::find(std::env::current_dir()?)? else {
+        let project = ProjectWorkspace::discover(std::env::current_dir()?)?;
-            return Err(anyhow::anyhow!(
-                "Unable to find `pyproject.toml` for project."
-            ));
-        };
 
         let venv = project::init(&project, cache, printer)?;
 

crates/uv/src/commands/project/sync.rs

@@ -5,15 +5,15 @@ use install_wheel_rs::linker::LinkMode;
 use uv_cache::Cache;
 use uv_client::RegistryClientBuilder;
 use uv_configuration::{
-    Concurrency, ConfigSettings, NoBinary, NoBuild, PreviewMode, SetupPyStrategy,
+    Concurrency, ConfigSettings, NoBinary, NoBuild, PreviewMode, Reinstall, SetupPyStrategy,
 };
 use uv_dispatch::BuildDispatch;
 use uv_installer::SitePackages;
+use uv_requirements::ProjectWorkspace;
 use uv_resolver::{FlatIndex, InMemoryIndex, Lock};
 use uv_types::{BuildIsolation, HashStrategy, InFlight};
 use uv_warnings::warn_user;
 
-use crate::commands::project::discovery::Project;
 use crate::commands::{project, ExitStatus};
 use crate::editables::ResolvedEditables;
 use crate::printer::Printer;
@@ -30,11 +30,7 @@ pub(crate) async fn sync(
     }
 
     // Find the project requirements.
-    let Some(project) = Project::find(std::env::current_dir()?)? else {
+    let project = ProjectWorkspace::discover(std::env::current_dir()?)?;
-        return Err(anyhow::anyhow!(
-            "Unable to find `pyproject.toml` for project."
-        ));
-    };
 
     // Discover or create the virtual environment.
     let venv = project::init(&project, cache, printer)?;
@@ -43,9 +39,10 @@ pub(crate) async fn sync(
 
     // Read the lockfile.
     let resolution = {
-        let encoded = fs_err::tokio::read_to_string(project.root().join("uv.lock")).await?;
+        let encoded =
+            fs_err::tokio::read_to_string(project.workspace().root().join("uv.lock")).await?;
         let lock: Lock = toml::from_str(&encoded)?;
-        lock.to_resolution(markers, tags, project.name())
+        lock.to_resolution(markers, tags, project.project_name())
     };
 
     // Initialize the registry client.
@@ -55,6 +52,8 @@ pub(crate) async fn sync(
         .platform(venv.interpreter().platform())
         .build();
 
+    let site_packages = SitePackages::from_executable(&venv)?;
+
     // TODO(charlie): Respect project configuration.
     let build_isolation = BuildIsolation::default();
     let config_settings = ConfigSettings::default();
@@ -68,6 +67,7 @@ pub(crate) async fn sync(
     let no_build = NoBuild::default();
     let setup_py = SetupPyStrategy::default();
     let concurrency = Concurrency::default();
+    let reinstall = Reinstall::None;
 
     // Create a build dispatch.
     let build_dispatch = BuildDispatch::new(
@@ -87,8 +87,20 @@ pub(crate) async fn sync(
         concurrency,
     );
 
-    // TODO(konsti): Read editables from lockfile.
+    let editables = ResolvedEditables::resolve(
-    let editables = ResolvedEditables::default();
+        Vec::new(), // TODO(konsti): Read editables from lockfile
+        &site_packages,
+        &reinstall,
+        &hasher,
+        venv.interpreter(),
+        tags,
+        cache,
+        &client,
+        &build_dispatch,
+        concurrency,
+        printer,
+    )
+    .await?;
 
     let site_packages = SitePackages::from_executable(&venv)?;
 

ruff.toml

@@ -1,6 +1,7 @@
 exclude = [
     "crates/uv-virtualenv/src/activator/activate_this.py",
-    "crates/uv-virtualenv/src/_virtualenv.py"
+    "crates/uv-virtualenv/src/_virtualenv.py",
+    "scripts/workspaces"
 ]
 [lint.per-file-ignores]
 "__init__.py" = ["F403", "F405"]

scripts/workspaces/albatross-in-example/check_installed_albatross.py

@@ -0,0 +1,11 @@
+from albatross import fly
+
+try:
+    from bird_feeder import use
+
+    raise RuntimeError("bird-feeder installed")
+except ModuleNotFoundError:
+    pass
+
+fly()
+print("Success")

scripts/workspaces/albatross-in-example/examples/bird-feeder/check_installed_bird_feeder.py

@@ -0,0 +1,10 @@
+from bird_feeder import use
+
+try:
+    from albatross import fly
+
+    raise RuntimeError("albatross installed")
+except ModuleNotFoundError:
+    pass
+
+print("Success")

scripts/workspaces/albatross-in-example/examples/bird-feeder/pyproject.toml

@@ -0,0 +1,8 @@
+[project]
+name = "bird-feeder"
+version = "1.0.0"
+dependencies = ["anyio>=4.3.0,<5"]
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"

scripts/workspaces/albatross-in-example/examples/bird-feeder/src/bird_feeder/__init__.py

@@ -0,0 +1,5 @@
+import anyio
+
+
+def use():
+    print("squirrel")

scripts/workspaces/albatross-in-example/pyproject.toml

@@ -0,0 +1,8 @@
+[project]
+name = "albatross"
+version = "0.1.0"
+dependencies = ["tqdm>=4,<5"]
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"

scripts/workspaces/albatross-in-example/src/albatross/__init__.py

@@ -0,0 +1,9 @@
+import tqdm
+
+
+def fly():
+    pass
+
+
+if __name__ == '__main__':
+    print("Caw")

scripts/workspaces/albatross-just-project/check_installed_albatross.py

@@ -0,0 +1,4 @@
+from albatross import fly
+
+fly()
+print("Success")

scripts/workspaces/albatross-just-project/pyproject.toml

@@ -0,0 +1,8 @@
+[project]
+name = "albatross"
+version = "0.1.0"
+dependencies = ["tqdm>=4,<5"]
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"

scripts/workspaces/albatross-just-project/src/albatross/__init__.py

@@ -0,0 +1,2 @@
+def fly():
+    pass

scripts/workspaces/albatross-project-in-excluded/excluded/bird-feeder/check_installed_bird_feeder.py

@@ -0,0 +1,10 @@
+from bird_feeder import use
+
+try:
+    from albatross import fly
+
+    raise RuntimeError("albatross installed")
+except ModuleNotFoundError:
+    pass
+
+print("Success")

scripts/workspaces/albatross-project-in-excluded/excluded/bird-feeder/pyproject.toml

@@ -0,0 +1,8 @@
+[project]
+name = "bird-feeder"
+version = "1.0.0"
+dependencies = ["anyio>=4.3.0,<5"]
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"

scripts/workspaces/albatross-project-in-excluded/excluded/bird-feeder/src/bird_feeder/__init__.py

@@ -0,0 +1,5 @@
+import anyio
+
+
+def use():
+    print("squirrel")

scripts/workspaces/albatross-project-in-excluded/pyproject.toml

@@ -0,0 +1,12 @@
+[project]
+name = "albatross"
+version = "0.1.0"
+dependencies = ["tqdm>=4,<5"]
+
+[tool.uv.workspace]
+members = ["packages/*"]
+exclude = ["excluded/*"]
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"

scripts/workspaces/albatross-project-in-excluded/src/albatross/__init__.py

@@ -0,0 +1,5 @@
+import tqdm
+from bird_feeder import use
+
+print("Caw")
+use()

scripts/workspaces/albatross-root-workspace/check_installed_albatross.py

@@ -0,0 +1,4 @@
+from albatross import fly
+
+fly()
+print("Success")

scripts/workspaces/albatross-root-workspace/packages/bird-feeder/check_installed_bird_feeder.py

@@ -0,0 +1,10 @@
+from bird_feeder import use
+
+try:
+    from albatross import fly
+
+    raise RuntimeError("albatross installed")
+except ModuleNotFoundError:
+    pass
+
+print("Success")

scripts/workspaces/albatross-root-workspace/packages/bird-feeder/pyproject.toml

@@ -0,0 +1,11 @@
+[project]
+name = "bird-feeder"
+version = "1.0.0"
+dependencies = ["anyio>=4.3.0,<5", "seeds"]
+
+[tool.uv.sources]
+seeds = { workspace = true }
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"

scripts/workspaces/albatross-root-workspace/packages/bird-feeder/src/bird_feeder/__init__.py

@@ -0,0 +1,5 @@
+import anyio
+
+
+def use():
+    print("squirrel")

scripts/workspaces/albatross-root-workspace/packages/seeds/pyproject.toml

@@ -0,0 +1,8 @@
+[project]
+name = "seeds"
+version = "1.0.0"
+dependencies = ["boltons==24.0.0"]
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"

scripts/workspaces/albatross-root-workspace/packages/seeds/src/seeds/__init__.py

@@ -0,0 +1,5 @@
+import boltons
+
+
+def seeds():
+    print("sunflower")

scripts/workspaces/albatross-root-workspace/pyproject.toml

@@ -0,0 +1,14 @@
+[project]
+name = "albatross"
+version = "0.1.0"
+dependencies = ["bird-feeder", "tqdm>=4,<5"]
+
+[tool.uv.sources]
+bird-feeder = { workspace = true }
+
+[tool.uv.workspace]
+members = ["packages/*"]
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"

scripts/workspaces/albatross-root-workspace/src/albatross/__init__.py

@@ -0,0 +1,11 @@
+import tqdm
+from bird_feeder import use
+
+
+def fly():
+    pass
+
+
+if __name__ == "__main__":
+    print("Caw")
+    use()

scripts/workspaces/albatross-virtual-workspace/packages/albatross/check_installed_albatross.py

@@ -0,0 +1,4 @@
+from albatross import fly
+
+fly()
+print("Success")

scripts/workspaces/albatross-virtual-workspace/packages/albatross/pyproject.toml

@@ -0,0 +1,11 @@
+[project]
+name = "albatross"
+version = "0.1.0"
+dependencies = ["bird-feeder", "tqdm>=4,<5"]
+
+[tool.uv.sources]
+bird-feeder = { workspace = true }
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"

scripts/workspaces/albatross-virtual-workspace/packages/albatross/src/albatross/__init__.py

@@ -0,0 +1,11 @@
+import tqdm
+from bird_feeder import use
+
+
+def fly():
+    pass
+
+
+if __name__ == "__main__":
+    print("Caw")
+    use()

scripts/workspaces/albatross-virtual-workspace/packages/bird-feeder/check_installed_bird_feeder.py

@@ -0,0 +1,10 @@
+from bird_feeder import use
+
+try:
+    from albatross import fly
+
+    raise RuntimeError("albatross installed")
+except ModuleNotFoundError:
+    pass
+
+print("Success")

scripts/workspaces/albatross-virtual-workspace/packages/bird-feeder/pyproject.toml

@@ -0,0 +1,11 @@
+[project]
+name = "bird-feeder"
+version = "1.0.0"
+dependencies = ["anyio>=4.3.0,<5", "seeds"]
+
+[tool.uv.sources]
+seeds = { workspace = true }
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"

scripts/workspaces/albatross-virtual-workspace/packages/bird-feeder/src/bird_feeder/__init__.py

@@ -0,0 +1,5 @@
+import anyio
+
+
+def use():
+    print("squirrel")

scripts/workspaces/albatross-virtual-workspace/packages/seeds/pyproject.toml

@@ -0,0 +1,8 @@
+[project]
+name = "seeds"
+version = "1.0.0"
+dependencies = ["boltons==24.0.0"]
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"

scripts/workspaces/albatross-virtual-workspace/packages/seeds/src/seeds/__init__.py

@@ -0,0 +1,5 @@
+import boltons
+
+
+def seeds():
+    print("sunflower")

scripts/workspaces/albatross-virtual-workspace/pyproject.toml

@@ -0,0 +1,2 @@
+[tool.uv.workspace]
+members = ["packages/*"]