Add support for requirements files in uv run (#4973)

Closes https://github.com/astral-sh/uv/issues/4824.

---------

Co-authored-by: Charlie Marsh <charlie.r.marsh@gmail.com>

crates/uv-cli/src/lib.rs

@@ -1847,6 +1847,12 @@ pub struct RunArgs {
     #[arg(long)]
     pub with: Vec<String>,
 
+    /// Run with all packages listed in the given `requirements.txt` files.
+    ///
+    /// Using `pyproject.toml`, `setup.py`, or `setup.cfg` files is not allowed.
+    #[arg(long, value_parser = parse_maybe_file_path)]
+    pub with_requirements: Vec<Maybe<PathBuf>>,
+
     /// Assert that the `uv.lock` will remain unchanged.
     #[arg(long, conflicts_with = "frozen")]
     pub locked: bool,

crates/uv-requirements/src/specification.rs

@@ -336,4 +336,9 @@ impl RequirementsSpecification {
             ..Self::default()
         }
     }
+
+    /// Return true if the specification does not include any requirements to install.
+    pub fn is_empty(&self) -> bool {
+        self.requirements.is_empty() && self.source_trees.is_empty() && self.overrides.is_empty()
+    }
 }

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

@@ -239,7 +239,7 @@ pub(crate) async fn add(
         &VirtualProject::Project(project),
         &venv,
         &lock,
-        extras,
+        &extras,
         dev,
         Modifications::Sufficient,
         settings.as_ref().into(),

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

@@ -645,7 +645,11 @@ pub(crate) async fn update_environment(
 
     // Check if the current environment satisfies the requirements
     let site_packages = SitePackages::from_environment(&venv)?;
-    if spec.source_trees.is_empty() && reinstall.is_none() && upgrade.is_none() {
+    if spec.source_trees.is_empty()
+        && reinstall.is_none()
+        && upgrade.is_none()
+        && spec.overrides.is_empty()
+    {
         match site_packages.satisfies(&spec.requirements, &spec.constraints)? {
             // If the requirements are already satisfied, we're done.
             SatisfiesResult::Fresh {

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

@@ -132,7 +132,7 @@ pub(crate) async fn remove(
         &VirtualProject::Project(project),
         &venv,
         &lock,
-        extras,
+        &extras,
         dev,
         Modifications::Exact,
         settings.as_ref().into(),

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

@@ -1,9 +1,9 @@
 use std::borrow::Cow;
 use std::ffi::OsString;
 use std::fmt::Write;
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
 
-use anyhow::{Context, Result};
+use anyhow::{bail, Context, Result};
 use itertools::Itertools;
 use owo_colors::OwoColorize;
 use tokio::process::Command;
@@ -59,6 +59,28 @@ pub(crate) async fn run(
         warn_user_once!("`uv run` is experimental and may change without warning");
     }
 
+    // These cases seem quite complex because (in theory) they should change the "current package".
+    // Let's ban them entirely for now.
+    for source in &requirements {
+        match source {
+            RequirementsSource::PyprojectToml(_) => {
+                bail!("Adding requirements from a `pyproject.toml` is not supported in `uv run`");
+            }
+            RequirementsSource::SetupPy(_) => {
+                bail!("Adding requirements from a `setup.py` is not supported in `uv run`");
+            }
+            RequirementsSource::SetupCfg(_) => {
+                bail!("Adding requirements from a `setup.cfg` is not supported in `uv run`");
+            }
+            RequirementsSource::RequirementsTxt(path) => {
+                if path == Path::new("-") {
+                    bail!("Reading requirements from stdin is not supported in `uv run`");
+                }
+            }
+            _ => {}
+        }
+    }
+
     // Parse the input command.
     let command = RunCommand::from(command);
 
@@ -216,7 +238,7 @@ pub(crate) async fn run(
                 &project,
                 &venv,
                 &lock,
-                extras,
+                &extras,
                 dev,
                 Modifications::Sufficient,
                 settings.as_ref().into(),
@@ -264,7 +286,7 @@ pub(crate) async fn run(
         );
     }
 
-    // Read the `--with` requirements.
+    // Read the requirements.
     let spec = if requirements.is_empty() {
         None
     } else {
@@ -282,6 +304,7 @@ pub(crate) async fn run(
     // any `--with` requirements, and we already have a base environment, then there's no need to
     // create an additional environment.
     let skip_ephemeral = base_interpreter.as_ref().is_some_and(|base_interpreter| {
+        // No additional requirements.
         let Some(spec) = spec.as_ref() else {
             return true;
         };
@@ -364,19 +387,11 @@ pub(crate) async fn run(
             false,
         )?;
 
-        if requirements.is_empty() {
+        match spec {
-            Some(venv)
+            None => Some(venv),
-        } else {
+            Some(spec) if spec.is_empty() => Some(venv),
+            Some(spec) => {
                 debug!("Syncing ephemeral requirements");
-
-            let client_builder = BaseClientBuilder::new()
-                .connectivity(connectivity)
-                .native_tls(native_tls);
-
-            let spec =
-                RequirementsSpecification::from_simple_sources(&requirements, &client_builder)
-                    .await?;
-
                 // Install the ephemeral requirements.
                 Some(
                     project::update_environment(
@@ -394,6 +409,7 @@ pub(crate) async fn run(
                     .await?,
                 )
             }
+        }
     };
 
     debug!("Running `{command}`");

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

@@ -96,7 +96,7 @@ pub(crate) async fn sync(
         &project,
         &venv,
         &lock,
-        extras,
+        &extras,
         dev,
         modifications,
         settings.as_ref().into(),
@@ -118,7 +118,7 @@ pub(super) async fn do_sync(
     project: &VirtualProject,
     venv: &PythonEnvironment,
     lock: &Lock,
-    extras: ExtrasSpecification,
+    extras: &ExtrasSpecification,
     dev: bool,
     modifications: Modifications,
     settings: InstallerSettingsRef<'_>,
@@ -164,7 +164,7 @@ pub(super) async fn do_sync(
     let tags = venv.interpreter().tags()?;
 
     // Read the lockfile.
-    let resolution = lock.to_resolution(project, markers, tags, &extras, &dev)?;
+    let resolution = lock.to_resolution(project, markers, tags, extras, &dev)?;
 
     // Initialize the registry client.
     let client = RegistryClientBuilder::new(cache.clone())

crates/uv/src/lib.rs

@@ -859,6 +859,11 @@ async fn run_project(
                 .with
                 .into_iter()
                 .map(RequirementsSource::from_package)
+                .chain(
+                    args.with_requirements
+                        .into_iter()
+                        .map(RequirementsSource::from_requirements_file),
+                )
                 .collect::<Vec<_>>();
 
             commands::run(

crates/uv/src/settings.rs

@@ -187,6 +187,7 @@ pub(crate) struct RunSettings {
     pub(crate) dev: bool,
     pub(crate) command: ExternalCommand,
     pub(crate) with: Vec<String>,
+    pub(crate) with_requirements: Vec<PathBuf>,
     pub(crate) package: Option<PackageName>,
     pub(crate) python: Option<String>,
     pub(crate) refresh: Refresh,
@@ -207,6 +208,7 @@ impl RunSettings {
             no_dev,
             command,
             with,
+            with_requirements,
             installer,
             build,
             refresh,
@@ -224,6 +226,10 @@ impl RunSettings {
             dev: flag(dev, no_dev).unwrap_or(true),
             command,
             with,
+            with_requirements: with_requirements
+                .into_iter()
+                .filter_map(Maybe::into_option)
+                .collect(),
             package,
             python,
             refresh: Refresh::from(refresh),

crates/uv/tests/run.rs

@@ -2,7 +2,7 @@
 
 use anyhow::Result;
 use assert_cmd::assert::OutputAssertExt;
-use assert_fs::prelude::*;
+use assert_fs::{fixture::ChildPath, prelude::*};
 use indoc::indoc;
 
 use common::{uv_snapshot, TestContext};
@@ -541,3 +541,180 @@ fn run_frozen() -> Result<()> {
 
     Ok(())
 }
+
+#[test]
+fn run_empty_requirements_txt() -> Result<()> {
+    let context = TestContext::new("3.12");
+
+    let pyproject_toml = context.temp_dir.child("pyproject.toml");
+    pyproject_toml.write_str(indoc! { r#"
+        [project]
+        name = "foo"
+        version = "1.0.0"
+        requires-python = ">=3.8"
+        dependencies = ["anyio", "sniffio==1.3.1"]
+        "#
+    })?;
+
+    let test_script = context.temp_dir.child("main.py");
+    test_script.write_str(indoc! { r"
+        import sniffio
+       "
+    })?;
+
+    let requirements_txt =
+        ChildPath::new(context.temp_dir.canonicalize()?.join("requirements.txt"));
+    requirements_txt.touch()?;
+
+    // The project environment is synced on the first invocation.
+    uv_snapshot!(context.filters(), context.run().arg("--with-requirements").arg(requirements_txt.as_os_str()).arg("main.py"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    warning: `uv run` is experimental and may change without warning
+    Resolved 6 packages in [TIME]
+    Prepared 4 packages in [TIME]
+    Installed 4 packages in [TIME]
+     + anyio==4.3.0
+     + foo==1.0.0 (from file://[TEMP_DIR]/)
+     + idna==3.6
+     + sniffio==1.3.1
+    warning: Requirements file requirements.txt does not contain any dependencies
+    "###);
+
+    // Then reused in subsequent invocations
+    uv_snapshot!(context.filters(), context.run().arg("--with-requirements").arg(requirements_txt.as_os_str()).arg("main.py"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    warning: `uv run` is experimental and may change without warning
+    Resolved 6 packages in [TIME]
+    Audited 4 packages in [TIME]
+    warning: Requirements file requirements.txt does not contain any dependencies
+    "###);
+
+    Ok(())
+}
+
+#[test]
+fn run_requirements_txt() -> Result<()> {
+    let context = TestContext::new("3.12");
+
+    let pyproject_toml = context.temp_dir.child("pyproject.toml");
+    pyproject_toml.write_str(indoc! { r#"
+        [project]
+        name = "foo"
+        version = "1.0.0"
+        requires-python = ">=3.8"
+        dependencies = ["anyio", "sniffio==1.3.1"]
+        "#
+    })?;
+
+    let test_script = context.temp_dir.child("main.py");
+    test_script.write_str(indoc! { r"
+        import sniffio
+       "
+    })?;
+
+    // Requesting an unsatisfied requirement should install it.
+    let requirements_txt = context.temp_dir.child("requirements.txt");
+    requirements_txt.write_str("iniconfig")?;
+
+    uv_snapshot!(context.filters(), context.run().arg("--with-requirements").arg(requirements_txt.as_os_str()).arg("main.py"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    warning: `uv run` is experimental and may change without warning
+    Resolved 6 packages in [TIME]
+    Prepared 4 packages in [TIME]
+    Installed 4 packages in [TIME]
+     + anyio==4.3.0
+     + foo==1.0.0 (from file://[TEMP_DIR]/)
+     + idna==3.6
+     + sniffio==1.3.1
+    Resolved 1 package in [TIME]
+    Prepared 1 package in [TIME]
+    Installed 1 package in [TIME]
+     + iniconfig==2.0.0
+    "###);
+
+    // Requesting a satisfied requirement should use the base environment.
+    requirements_txt.write_str("sniffio")?;
+
+    uv_snapshot!(context.filters(), context.run().arg("--with-requirements").arg(requirements_txt.as_os_str()).arg("main.py"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    warning: `uv run` is experimental and may change without warning
+    Resolved 6 packages in [TIME]
+    Audited 4 packages in [TIME]
+    "###);
+
+    // Unless the user requests a different version.
+    requirements_txt.write_str("sniffio<1.3.1")?;
+
+    uv_snapshot!(context.filters(), context.run().arg("--with-requirements").arg(requirements_txt.as_os_str()).arg("main.py"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    warning: `uv run` is experimental and may change without warning
+    Resolved 6 packages in [TIME]
+    Audited 4 packages in [TIME]
+    Resolved 1 package in [TIME]
+    Prepared 1 package in [TIME]
+    Installed 1 package in [TIME]
+     + sniffio==1.3.0
+    "###);
+
+    // Or includes an unsatisfied requirement via `--with`.
+    requirements_txt.write_str("sniffio")?;
+
+    uv_snapshot!(context.filters(), context.run()
+        .arg("--with-requirements")
+        .arg(requirements_txt.as_os_str())
+        .arg("--with")
+        .arg("iniconfig")
+        .arg("main.py"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    warning: `uv run` is experimental and may change without warning
+    Resolved 6 packages in [TIME]
+    Audited 4 packages in [TIME]
+    Resolved 2 packages in [TIME]
+    Prepared 1 package in [TIME]
+    Installed 2 packages in [TIME]
+     + iniconfig==2.0.0
+     + sniffio==1.3.1
+    "###);
+
+    // But reject `-` as a requirements file.
+    uv_snapshot!(context.filters(), context.run()
+        .arg("--with-requirements")
+        .arg("-")
+        .arg("--with")
+        .arg("iniconfig")
+        .arg("main.py"), @r###"
+    success: false
+    exit_code: 2
+    ----- stdout -----
+
+    ----- stderr -----
+    warning: `uv run` is experimental and may change without warning
+    error: Reading requirements from stdin is not supported in `uv run`
+    "###);
+
+    Ok(())
+}