feat(rustup-init): set log level to WARN on -q if RUSTUP_LOG is unset

rustup-init.sh

@@ -41,7 +41,7 @@ Options:
   -v, --verbose
           Enable verbose output
   -q, --quiet
-          Disable progress output
+          Disable progress output, limit console logger level to 'WARN' if 'RUSTUP_LOG' is unset
   -y
           Disable confirmation prompt
       --default-host <DEFAULT_HOST>

src/bin/rustup-init.rs

@@ -21,6 +21,7 @@ use cfg_if::cfg_if;
 use rs_tracing::{
     close_trace_file, close_trace_file_internal, open_trace_file, trace_to_file_internal,
 };
+use tracing_subscriber::{reload::Handle, EnvFilter, Registry};
 
 use rustup::cli::common;
 use rustup::cli::proxy_mode;
@@ -44,9 +45,9 @@ async fn main() -> Result<ExitCode> {
     opentelemetry::global::set_text_map_propagator(
         opentelemetry_sdk::propagation::TraceContextPropagator::new(),
     );
-    let subscriber = rustup::cli::log::tracing_subscriber(&process);
+    let (subscriber, console_filter) = rustup::cli::log::tracing_subscriber(&process);
     tracing::subscriber::set_global_default(subscriber)?;
-    let result = run_rustup(&process).await;
+    let result = run_rustup(&process, console_filter).await;
     // We're tracing, so block until all spans are exported.
     #[cfg(feature = "otel")]
     opentelemetry::global::shutdown_tracer_provider();
@@ -61,19 +62,25 @@ async fn main() -> Result<ExitCode> {
 }
 
 #[cfg_attr(feature = "otel", tracing::instrument)]
-async fn run_rustup(process: &Process) -> Result<utils::ExitCode> {
+async fn run_rustup(
+    process: &Process,
+    console_filter: Handle<EnvFilter, Registry>,
+) -> Result<utils::ExitCode> {
     if let Ok(dir) = process.var("RUSTUP_TRACE_DIR") {
         open_trace_file!(dir)?;
     }
-    let result = run_rustup_inner(process).await;
+    let result = run_rustup_inner(process, console_filter).await;
     if process.var("RUSTUP_TRACE_DIR").is_ok() {
         close_trace_file!();
     }
     result
 }
 
 #[cfg_attr(feature = "otel", tracing::instrument(err))]
-async fn run_rustup_inner(process: &Process) -> Result<utils::ExitCode> {
+async fn run_rustup_inner(
+    process: &Process,
+    console_filter: Handle<EnvFilter, Registry>,
+) -> Result<utils::ExitCode> {
     // Guard against infinite proxy recursion. This mostly happens due to
     // bugs in rustup.
     do_recursion_guard(process)?;
@@ -92,7 +99,7 @@ async fn run_rustup_inner(process: &Process) -> Result<utils::ExitCode> {
             // name. Browsers rename duplicates to
             // e.g. rustup-setup(2), and this allows all variations
             // to work.
-            setup_mode::main(current_dir, process).await
+            setup_mode::main(current_dir, process, console_filter).await
         }
         Some(n) if n.starts_with("rustup-gc-") => {
             // This is the final uninstallation stage on windows where

src/cli/log.rs

@@ -1,34 +1,40 @@
 use std::{fmt, io::Write};
 
+#[cfg(feature = "otel")]
+use opentelemetry_sdk::trace::Tracer;
 use termcolor::{Color, ColorSpec, WriteColor};
 use tracing::{level_filters::LevelFilter, Event, Subscriber};
 use tracing_subscriber::{
     fmt::{
         format::{self, FormatEvent, FormatFields},
         FmtContext,
     },
+    layer::SubscriberExt,
     registry::LookupSpan,
-    EnvFilter, Layer,
+    reload, EnvFilter, Layer, Registry,
 };
 
-#[cfg(feature = "otel")]
-use opentelemetry_sdk::trace::Tracer;
-
 use crate::{currentprocess::Process, utils::notify::NotificationLevel};
 
-pub fn tracing_subscriber(process: &Process) -> impl tracing::Subscriber {
-    use tracing_subscriber::{layer::SubscriberExt, Registry};
-
+pub fn tracing_subscriber(
+    process: &Process,
+) -> (
+    impl tracing::Subscriber,
+    reload::Handle<EnvFilter, Registry>,
+) {
     #[cfg(feature = "otel")]
     let telemetry = telemetry(process);
-    let console_logger = console_logger(process);
+    let (console_logger, console_filter) = console_logger(process);
     #[cfg(feature = "otel")]
     {
-        Registry::default().with(console_logger).with(telemetry)
+        (
+            Registry::default().with(console_logger).with(telemetry),
+            console_filter,
+        )
     }
     #[cfg(not(feature = "otel"))]
     {
-        Registry::default().with(console_logger)
+        (Registry::default().with(console_logger), console_filter)
     }
 }
 
@@ -38,7 +44,7 @@ pub fn tracing_subscriber(process: &Process) -> impl tracing::Subscriber {
 /// When the `RUSTUP_LOG` environment variable is present, a standard [`tracing_subscriber`]
 /// formatter will be used according to the filtering directives set in its value.
 /// Otherwise, this logger will use [`EventFormatter`] to mimic "classic" Rustup `stderr` output.
-fn console_logger<S>(process: &Process) -> impl Layer<S>
+fn console_logger<S>(process: &Process) -> (impl Layer<S>, reload::Handle<EnvFilter, S>)
 where
     S: Subscriber + for<'span> LookupSpan<'span>,
 {
@@ -55,17 +61,22 @@ where
         .with_writer(move || process.stderr())
         .with_ansi(has_ansi);
     if let Ok(directives) = maybe_rustup_log_directives {
-        let env_filter = EnvFilter::builder()
-            .with_default_directive(LevelFilter::INFO.into())
-            .parse_lossy(directives);
-        logger.compact().with_filter(env_filter).boxed()
+        let (env_filter, handle) = reload::Layer::new(
+            EnvFilter::builder()
+                .with_default_directive(LevelFilter::INFO.into())
+                .parse_lossy(directives),
+        );
+        (logger.compact().with_filter(env_filter).boxed(), handle)
     } else {
         // Receive log lines from Rustup only.
-        let env_filter = EnvFilter::new("rustup=DEBUG");
-        logger
-            .event_format(EventFormatter)
-            .with_filter(env_filter)
-            .boxed()
+        let (env_filter, handle) = reload::Layer::new(EnvFilter::new("rustup=DEBUG"));
+        (
+            logger
+                .event_format(EventFormatter)
+                .with_filter(env_filter)
+                .boxed(),
+            handle,
+        )
     }
 }
 

src/cli/setup_mode.rs

@@ -3,6 +3,7 @@ use std::path::PathBuf;
 use anyhow::Result;
 use clap::Parser;
 use tracing::warn;
+use tracing_subscriber::{reload::Handle, EnvFilter, Registry};
 
 use crate::{
     cli::{
@@ -28,7 +29,7 @@ struct RustupInit {
     #[arg(short, long)]
     verbose: bool,
 
-    /// Disable progress output
+    /// Disable progress output, limit console logger level to 'WARN' if 'RUSTUP_LOG' is unset
     #[arg(short, long)]
     quiet: bool,
 
@@ -73,7 +74,11 @@ struct RustupInit {
 }
 
 #[cfg_attr(feature = "otel", tracing::instrument)]
-pub async fn main(current_dir: PathBuf, process: &Process) -> Result<utils::ExitCode> {
+pub async fn main(
+    current_dir: PathBuf,
+    process: &Process,
+    console_filter: Handle<EnvFilter, Registry>,
+) -> Result<utils::ExitCode> {
     use clap::error::ErrorKind;
 
     let RustupInit {
@@ -111,6 +116,12 @@ pub async fn main(current_dir: PathBuf, process: &Process) -> Result<utils::Exit
         warn!("{}", common::WARN_COMPLETE_PROFILE);
     }
 
+    if quiet && process.var("RUSTUP_LOG").is_err() {
+        console_filter
+            .modify(|it| *it = EnvFilter::new("rustup=WARN"))
+            .expect("error reloading `EnvFilter` for console_logger");
+    }
+
     let opts = InstallOpts {
         default_host_triple: default_host,
         default_toolchain,

src/currentprocess.rs

@@ -234,7 +234,7 @@ impl TestProcess {
 impl From<TestContext> for TestProcess {
     fn from(inner: TestContext) -> Self {
         let inner = Process::TestProcess(inner);
-        let guard = crate::cli::log::tracing_subscriber(&inner).set_default();
+        let guard = crate::cli::log::tracing_subscriber(&inner).0.set_default();
         Self {
             process: inner,
             _guard: guard,

tests/suite/cli-ui/rustup-init/rustup-init_help_flag_stdout.toml

@@ -12,7 +12,7 @@ Options:
   -v, --verbose
           Enable verbose output
   -q, --quiet
-          Disable progress output
+          Disable progress output, limit console logger level to 'WARN' if 'RUSTUP_LOG' is unset
   -y
           Disable confirmation prompt
       --default-host <DEFAULT_HOST>

tests/suite/cli-ui/rustup-init/rustup-init_sh_help_flag_stdout.toml

@@ -12,7 +12,7 @@ Options:
   -v, --verbose
           Enable verbose output
   -q, --quiet
-          Disable progress output
+          Disable progress output, limit console logger level to 'WARN' if 'RUSTUP_LOG' is unset
   -y
           Disable confirmation prompt
       --default-host <DEFAULT_HOST>