Respect --quiet flag in uv build (#7674)

I noticed this was not respected, seems like an oversight.

crates/uv-build/src/error.rs

@@ -239,7 +239,7 @@ impl Error {
 
         if let Some(missing_library) = missing_library {
             return match level {
-                BuildOutput::Stderr => Self::MissingHeader {
+                BuildOutput::Stderr | BuildOutput::Quiet => Self::MissingHeader {
                     message,
                     exit_code: output.status,
                     missing_header_cause: MissingHeaderCause {
@@ -265,7 +265,7 @@ impl Error {
         }
 
         match level {
-            BuildOutput::Stderr => Self::BuildBackend {
+            BuildOutput::Stderr | BuildOutput::Quiet => Self::BuildBackend {
                 message,
                 exit_code: output.status,
             },

crates/uv-build/src/lib.rs

@@ -988,6 +988,8 @@ pub enum Printer {
     Stderr,
     /// Send the build backend output to `tracing`.
     Debug,
+    /// Hide the build backend output.
+    Quiet,
 }
 
 impl From<BuildOutput> for Printer {
@@ -995,6 +997,7 @@ impl From<BuildOutput> for Printer {
         match output {
             BuildOutput::Stderr => Self::Stderr,
             BuildOutput::Debug => Self::Debug,
+            BuildOutput::Quiet => Self::Quiet,
         }
     }
 }
@@ -1008,6 +1011,7 @@ impl Write for Printer {
             Self::Debug => {
                 debug!("{s}");
             }
+            Self::Quiet => {}
         }
         Ok(())
     }

crates/uv-configuration/src/build_options.rs

@@ -31,6 +31,8 @@ pub enum BuildOutput {
     Stderr,
     /// Send the build backend output to `tracing`.
     Debug,
+    /// Do not display the build backend output.
+    Quiet,
 }
 
 #[derive(Debug, Default, Clone, PartialEq, Eq, serde::Serialize, serde::Deserialize)]

crates/uv/src/commands/build.rs

@@ -1,15 +1,11 @@
-use crate::commands::project::find_requires_python;
-use crate::commands::reporters::PythonDownloadReporter;
-use crate::commands::{ExitStatus, SharedState};
-use crate::printer::Printer;
-use crate::settings::{ResolverSettings, ResolverSettingsRef};
 use std::borrow::Cow;
+use std::fmt::Write;
+use std::path::{Path, PathBuf};
 
-use crate::commands::pip::operations;
 use anyhow::Result;
 use distribution_filename::SourceDistExtension;
 use owo_colors::OwoColorize;
-use std::path::{Path, PathBuf};
+
 use uv_auth::store_credentials_from_url;
 use uv_cache::Cache;
 use uv_client::{BaseClientBuilder, Connectivity, FlatIndexClient, RegistryClientBuilder};
@@ -26,6 +22,13 @@ use uv_resolver::{FlatIndex, RequiresPython};
 use uv_types::{BuildContext, BuildIsolation, HashStrategy};
 use uv_workspace::{DiscoveryOptions, Workspace};
 
+use crate::commands::pip::operations;
+use crate::commands::project::find_requires_python;
+use crate::commands::reporters::PythonDownloadReporter;
+use crate::commands::{ExitStatus, SharedState};
+use crate::printer::Printer;
+use crate::settings::{ResolverSettings, ResolverSettingsRef};
+
 /// Build source distributions and wheels.
 #[allow(clippy::fn_params_excessive_bools)]
 pub(crate) async fn build(
@@ -72,17 +75,26 @@ pub(crate) async fn build(
 
     match assets {
         BuiltDistributions::Wheel(wheel) => {
-            anstream::eprintln!("Successfully built {}", wheel.user_display().bold().cyan());
+            writeln!(
+                printer.stderr(),
+                "Successfully built {}",
+                wheel.user_display().bold().cyan()
+            )?;
         }
         BuiltDistributions::Sdist(sdist) => {
-            anstream::eprintln!("Successfully built {}", sdist.user_display().bold().cyan());
+            writeln!(
+                printer.stderr(),
+                "Successfully built {}",
+                sdist.user_display().bold().cyan()
+            )?;
         }
         BuiltDistributions::Both(sdist, wheel) => {
-            anstream::eprintln!(
+            writeln!(
+                printer.stderr(),
                 "Successfully built {} and {}",
                 sdist.user_display().bold().cyan(),
                 wheel.user_display().bold().cyan()
-            );
+            )?;
         }
     }
 
@@ -356,9 +368,18 @@ async fn build_impl(
     let version_id = src.path().file_name().and_then(|name| name.to_str());
     let dist = None;
 
+    let build_output = match printer {
+        Printer::Default | Printer::NoProgress | Printer::Verbose => BuildOutput::Stderr,
+        Printer::Quiet => BuildOutput::Quiet,
+    };
+
     let assets = match plan {
         BuildPlan::SdistToWheel => {
-            anstream::eprintln!("{}", "Building source distribution...".bold());
+            writeln!(
+                printer.stderr(),
+                "{}",
+                "Building source distribution...".bold()
+            )?;
 
             // Build the sdist.
             let builder = build_dispatch
@@ -368,7 +389,7 @@ async fn build_impl(
                     version_id.map(ToString::to_string),
                     dist,
                     BuildKind::Sdist,
-                    BuildOutput::Stderr,
+                    build_output,
                 )
                 .await?;
             let sdist = builder.build(&output_dir).await?;
@@ -389,7 +410,11 @@ async fn build_impl(
                 Err(err) => return Err(err.into()),
             };
 
-            anstream::eprintln!("{}", "Building wheel from source distribution...".bold());
+            writeln!(
+                printer.stderr(),
+                "{}",
+                "Building wheel from source distribution...".bold()
+            )?;
 
             // Build a wheel from the source distribution.
             let builder = build_dispatch
@@ -399,7 +424,7 @@ async fn build_impl(
                     version_id.map(ToString::to_string),
                     dist,
                     BuildKind::Wheel,
-                    BuildOutput::Stderr,
+                    build_output,
                 )
                 .await?;
             let wheel = builder.build(&output_dir).await?;
@@ -407,7 +432,11 @@ async fn build_impl(
             BuiltDistributions::Both(output_dir.join(sdist), output_dir.join(wheel))
         }
         BuildPlan::Sdist => {
-            anstream::eprintln!("{}", "Building source distribution...".bold());
+            writeln!(
+                printer.stderr(),
+                "{}",
+                "Building source distribution...".bold()
+            )?;
 
             let builder = build_dispatch
                 .setup_build(
@@ -416,7 +445,7 @@ async fn build_impl(
                     version_id.map(ToString::to_string),
                     dist,
                     BuildKind::Sdist,
-                    BuildOutput::Stderr,
+                    build_output,
                 )
                 .await?;
             let sdist = builder.build(&output_dir).await?;
@@ -424,7 +453,7 @@ async fn build_impl(
             BuiltDistributions::Sdist(output_dir.join(sdist))
         }
         BuildPlan::Wheel => {
-            anstream::eprintln!("{}", "Building wheel...".bold());
+            writeln!(printer.stderr(), "{}", "Building wheel...".bold())?;
 
             let builder = build_dispatch
                 .setup_build(
@@ -433,7 +462,7 @@ async fn build_impl(
                     version_id.map(ToString::to_string),
                     dist,
                     BuildKind::Wheel,
-                    BuildOutput::Stderr,
+                    build_output,
                 )
                 .await?;
             let wheel = builder.build(&output_dir).await?;
@@ -441,7 +470,11 @@ async fn build_impl(
             BuiltDistributions::Wheel(output_dir.join(wheel))
         }
         BuildPlan::SdistAndWheel => {
-            anstream::eprintln!("{}", "Building source distribution...".bold());
+            writeln!(
+                printer.stderr(),
+                "{}",
+                "Building source distribution...".bold()
+            )?;
             let builder = build_dispatch
                 .setup_build(
                     src.path(),
@@ -449,12 +482,12 @@ async fn build_impl(
                     version_id.map(ToString::to_string),
                     dist,
                     BuildKind::Sdist,
-                    BuildOutput::Stderr,
+                    build_output,
                 )
                 .await?;
             let sdist = builder.build(&output_dir).await?;
 
-            anstream::eprintln!("{}", "Building wheel...".bold());
+            writeln!(printer.stderr(), "{}", "Building wheel...".bold())?;
             let builder = build_dispatch
                 .setup_build(
                     src.path(),
@@ -462,7 +495,7 @@ async fn build_impl(
                     version_id.map(ToString::to_string),
                     dist,
                     BuildKind::Wheel,
-                    BuildOutput::Stderr,
+                    build_output,
                 )
                 .await?;
             let wheel = builder.build(&output_dir).await?;
@@ -470,7 +503,11 @@ async fn build_impl(
             BuiltDistributions::Both(output_dir.join(&sdist), output_dir.join(&wheel))
         }
         BuildPlan::WheelFromSdist => {
-            anstream::eprintln!("{}", "Building wheel from source distribution...".bold());
+            writeln!(
+                printer.stderr(),
+                "{}",
+                "Building wheel from source distribution...".bold()
+            )?;
 
             // Extract the source distribution into a temporary directory.
             let reader = fs_err::tokio::File::open(src.path()).await?;
@@ -495,7 +532,7 @@ async fn build_impl(
                     version_id.map(ToString::to_string),
                     dist,
                     BuildKind::Wheel,
-                    BuildOutput::Stderr,
+                    build_output,
                 )
                 .await?;
             let wheel = builder.build(&output_dir).await?;

crates/uv/tests/build.rs

@@ -1486,3 +1486,38 @@ fn sha() -> Result<()> {
 
     Ok(())
 }
+
+#[test]
+fn build_quiet() -> Result<()> {
+    let context = TestContext::new("3.12");
+
+    let project = context.temp_dir.child("project");
+
+    let pyproject_toml = project.child("pyproject.toml");
+    pyproject_toml.write_str(
+        r#"
+        [project]
+        name = "project"
+        version = "0.1.0"
+        requires-python = ">=3.12"
+        dependencies = ["anyio==3.7.0"]
+
+        [build-system]
+        requires = ["setuptools>=42"]
+        build-backend = "setuptools.build_meta"
+        "#,
+    )?;
+
+    project.child("src").child("__init__.py").touch()?;
+    project.child("README").touch()?;
+
+    uv_snapshot!(&context.filters(), context.build().arg("project").arg("-q"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    "###);
+
+    Ok(())
+}