Add --no-create-gitignore to uv build (#16369)

Fixes #16332

crates/uv-cli/src/lib.rs

@@ -2639,6 +2639,16 @@ pub struct BuildArgs {
     #[arg(long)]
     pub clear: bool,
 
+    #[arg(long, overrides_with("no_create_gitignore"), hide = true)]
+    pub create_gitignore: bool,
+
+    /// Do not create a `.gitignore` file in the output directory.
+    ///
+    /// By default, uv creates a `.gitignore` file in the output directory to exclude build
+    /// artifacts from version control. When this flag is used, the file will be omitted.
+    #[arg(long, overrides_with("create_gitignore"))]
+    pub no_create_gitignore: bool,
+
     /// Constrain build dependencies using the given requirements files when building distributions.
     ///
     /// Constraints files are `requirements.txt`-like files that only control the _version_ of a

crates/uv/src/commands/build_frontend.rs

@@ -108,6 +108,7 @@ pub(crate) async fn build_frontend(
     wheel: bool,
     list: bool,
     build_logs: bool,
+    gitignore: bool,
     force_pep517: bool,
     clear: bool,
     build_constraints: Vec<RequirementsSource>,
@@ -134,6 +135,7 @@ pub(crate) async fn build_frontend(
         wheel,
         list,
         build_logs,
+        gitignore,
         force_pep517,
         clear,
         &build_constraints,
@@ -178,6 +180,7 @@ async fn build_impl(
     wheel: bool,
     list: bool,
     build_logs: bool,
+    gitignore: bool,
     force_pep517: bool,
     clear: bool,
     build_constraints: &[RequirementsSource],
@@ -344,6 +347,7 @@ async fn build_impl(
             client_builder.clone(),
             hash_checking,
             build_logs,
+            gitignore,
             force_pep517,
             clear,
             build_constraints,
@@ -452,6 +456,7 @@ async fn build_package(
     client_builder: BaseClientBuilder<'_>,
     hash_checking: Option<HashCheckingMode>,
     build_logs: bool,
+    gitignore: bool,
     force_pep517: bool,
     clear: bool,
     build_constraints: &[RequirementsSource],
@@ -627,7 +632,7 @@ async fn build_package(
         preview,
     );
 
-    prepare_output_directory(&output_dir).await?;
+    prepare_output_directory(&output_dir, gitignore).await?;
 
     // Determine the build plan.
     let plan = BuildPlan::determine(&source, sdist, wheel).map_err(Error::BuildPlan)?;
@@ -1094,19 +1099,21 @@ async fn build_wheel(
 }
 
 /// Create the output directory and add a `.gitignore`.
-async fn prepare_output_directory(output_dir: &Path) -> Result<(), Error> {
+async fn prepare_output_directory(output_dir: &Path, gitignore: bool) -> Result<(), Error> {
     // Create the output directory.
     fs_err::tokio::create_dir_all(&output_dir).await?;
 
     // Add a .gitignore.
-    match fs_err::OpenOptions::new()
-        .write(true)
-        .create_new(true)
-        .open(output_dir.join(".gitignore"))
-    {
-        Ok(mut file) => file.write_all(b"*")?,
-        Err(err) if err.kind() == io::ErrorKind::AlreadyExists => (),
-        Err(err) => return Err(err.into()),
+    if gitignore {
+        match fs_err::OpenOptions::new()
+            .write(true)
+            .create_new(true)
+            .open(output_dir.join(".gitignore"))
+        {
+            Ok(mut file) => file.write_all(b"*")?,
+            Err(err) if err.kind() == io::ErrorKind::AlreadyExists => (),
+            Err(err) => return Err(err.into()),
+        }
     }
     Ok(())
 }

crates/uv/src/lib.rs

@@ -1072,6 +1072,7 @@ async fn run(mut cli: Cli) -> Result<ExitStatus> {
                 args.wheel,
                 args.list,
                 args.build_logs,
+                args.gitignore,
                 args.force_pep517,
                 args.clear,
                 build_constraints,

crates/uv/src/settings.rs

@@ -2872,6 +2872,7 @@ pub(crate) struct BuildSettings {
     pub(crate) wheel: bool,
     pub(crate) list: bool,
     pub(crate) build_logs: bool,
+    pub(crate) gitignore: bool,
     pub(crate) force_pep517: bool,
     pub(crate) clear: bool,
     pub(crate) build_constraints: Vec<PathBuf>,
@@ -2906,6 +2907,8 @@ impl BuildSettings {
             no_verify_hashes,
             build_logs,
             no_build_logs,
+            create_gitignore,
+            no_create_gitignore,
             python,
             build,
             refresh,
@@ -2927,6 +2930,8 @@ impl BuildSettings {
             build_logs: flag(build_logs, no_build_logs, "build-logs").unwrap_or(true),
             force_pep517,
             clear,
+            gitignore: flag(create_gitignore, no_create_gitignore, "create-gitignore")
+                .unwrap_or(true),
             build_constraints: build_constraints
                 .into_iter()
                 .filter_map(Maybe::into_option)

crates/uv/tests/it/build.rs

@@ -2213,3 +2213,53 @@ fn build_clear() -> Result<()> {
 
     Ok(())
 }
+
+/// Test `uv build --no-create-gitignore`.
+#[test]
+fn build_no_gitignore() -> Result<()> {
+    let context = TestContext::new("3.12");
+
+    let project = context.temp_dir.child("project");
+
+    context.init().arg(project.path()).assert().success();
+
+    // Default build with `.gitignore`
+    uv_snapshot!(&context.filters(), context.build().arg("project").arg("--no-build-logs"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    Building source distribution...
+    Building wheel from source distribution...
+    Successfully built project/dist/project-0.1.0.tar.gz
+    Successfully built project/dist/project-0.1.0-py3-none-any.whl
+    "###);
+
+    project
+        .child("dist")
+        .child(".gitignore")
+        .assert(predicate::path::is_file());
+
+    fs_err::remove_dir_all(project.child("dist"))?;
+
+    // Build with `--no-create-gitignore` that does not create `.gitignore`
+    uv_snapshot!(&context.filters(), context.build().arg("project").arg("--no-create-gitignore").arg("--no-build-logs"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    Building source distribution...
+    Building wheel from source distribution...
+    Successfully built project/dist/project-0.1.0.tar.gz
+    Successfully built project/dist/project-0.1.0-py3-none-any.whl
+    "###);
+
+    project
+        .child("dist")
+        .child(".gitignore")
+        .assert(predicate::path::missing());
+
+    Ok(())
+}

docs/reference/cli.md

@@ -5730,7 +5730,9 @@ uv build [OPTIONS] [SRC]
 <p>May also be set with the <code>UV_NO_BUILD_PACKAGE</code> environment variable.</p></dd><dt id="uv-build--no-cache"><a href="#uv-build--no-cache"><code>--no-cache</code></a>, <code>--no-cache-dir</code>, <code>-n</code></dt><dd><p>Avoid reading from or writing to the cache, instead using a temporary directory for the duration of the operation</p>
 <p>May also be set with the <code>UV_NO_CACHE</code> environment variable.</p></dd><dt id="uv-build--no-config"><a href="#uv-build--no-config"><code>--no-config</code></a></dt><dd><p>Avoid discovering configuration files (<code>pyproject.toml</code>, <code>uv.toml</code>).</p>
 <p>Normally, configuration files are discovered in the current directory, parent directories, or user configuration directories.</p>
-<p>May also be set with the <code>UV_NO_CONFIG</code> environment variable.</p></dd><dt id="uv-build--no-index"><a href="#uv-build--no-index"><code>--no-index</code></a></dt><dd><p>Ignore the registry index (e.g., PyPI), instead relying on direct URL dependencies and those provided via <code>--find-links</code></p>
+<p>May also be set with the <code>UV_NO_CONFIG</code> environment variable.</p></dd><dt id="uv-build--no-create-gitignore"><a href="#uv-build--no-create-gitignore"><code>--no-create-gitignore</code></a></dt><dd><p>Do not create a <code>.gitignore</code> file in the output directory.</p>
+<p>By default, uv creates a <code>.gitignore</code> file in the output directory to exclude build artifacts from version control. When this flag is used, the file will be omitted.</p>
+</dd><dt id="uv-build--no-index"><a href="#uv-build--no-index"><code>--no-index</code></a></dt><dd><p>Ignore the registry index (e.g., PyPI), instead relying on direct URL dependencies and those provided via <code>--find-links</code></p>
 </dd><dt id="uv-build--no-managed-python"><a href="#uv-build--no-managed-python"><code>--no-managed-python</code></a></dt><dd><p>Disable use of uv-managed Python versions.</p>
 <p>Instead, uv will search for a suitable Python version on the system.</p>
 <p>May also be set with the <code>UV_NO_MANAGED_PYTHON</code> environment variable.</p></dd><dt id="uv-build--no-progress"><a href="#uv-build--no-progress"><code>--no-progress</code></a></dt><dd><p>Hide all progress outputs.</p>