feat: add environment variable to disable progress output (#8600)

The changes in this commit introduce the `UV_NO_PROGRESS` environment
variable as an alternative way to control progress output suppression in
uv-cli, equivalent to using the `--no-progress` flag. This enhancement
simplifies configuration in CI environments and automated scripts by
eliminating the need to detect whether the script is running in a CI
environment.

Previously, disabling progress output required either passing the
`--no-progress` flag directly or implementing script logic to detect CI
environments and conditionally add the flag. With this change, users can
now simply set `UV_NO_PROGRESS=true` in their environment to achieve the
same effect.

The changes include:

- Adding the `UV_NO_PROGRESS` environment variable to the `EnvVars`
struct in `crates/uv-static/src/env_vars.rs`.
- Updating the `GlobalArgs` struct in `crates/uv-cli/src/lib.rs` to
include a new `no_progress` field that is bound to the `UV_NO_PROGRESS`
environment variable.
- Adding documentation for the new `UV_NO_PROGRESS` environment variable
in `docs/configuration/environment.md`.
## Test Plan

After creating a uv project using `uv init` in a temp directory in this
project:
```
cargo run cache clean && cargo run venv && UV_NO_PROGRESS=false cargo run sync 
cargo run cache clean && cargo run venv && cargo run sync  
```
produce the expected default behavior 

```
cargo run cache clean && cargo run venv && UV_NO_PROGRESS=false cargo run sync  
```
produces the same behavior as having the `--no-progress` flag.

crates/uv-cli/src/lib.rs

@@ -232,7 +232,7 @@ pub struct GlobalArgs {
     /// Hide all progress outputs.
     ///
     /// For example, spinners or progress bars.
-    #[arg(global = true, long)]
+    #[arg(global = true, long, env = EnvVars::UV_NO_PROGRESS, value_parser = clap::builder::BoolishValueParser::new())]
     pub no_progress: bool,
 
     /// Change to the given directory prior to running the command.

crates/uv-static/src/env_vars.rs

@@ -277,6 +277,9 @@ impl EnvVars {
     /// Disables colored output (takes precedence over `FORCE_COLOR`).
     pub const NO_COLOR: &'static str = "NO_COLOR";
 
+    /// Disables all progress output. For example, spinners and progress bars.
+    pub const UV_NO_PROGRESS: &'static str = "UV_NO_PROGRESS";
+
     /// Forces colored output regardless of terminal support.
     pub const FORCE_COLOR: &'static str = "FORCE_COLOR";
 

crates/uv/tests/it/help.rs

@@ -54,7 +54,7 @@ fn help() {
           --native-tls                 Whether to load TLS certificates from the platform's native
                                        certificate store [env: UV_NATIVE_TLS=]
           --offline                    Disable network access
-          --no-progress                Hide all progress outputs
+          --no-progress                Hide all progress outputs [env: UV_NO_PROGRESS=]
           --directory <DIRECTORY>      Change to the given directory prior to running the command
           --project <PROJECT>          Run the command within the given project directory
           --config-file <CONFIG_FILE>  The path to a `uv.toml` file to use for configuration [env:
@@ -123,7 +123,7 @@ fn help_flag() {
           --native-tls                 Whether to load TLS certificates from the platform's native
                                        certificate store [env: UV_NATIVE_TLS=]
           --offline                    Disable network access
-          --no-progress                Hide all progress outputs
+          --no-progress                Hide all progress outputs [env: UV_NO_PROGRESS=]
           --directory <DIRECTORY>      Change to the given directory prior to running the command
           --project <PROJECT>          Run the command within the given project directory
           --config-file <CONFIG_FILE>  The path to a `uv.toml` file to use for configuration [env:
@@ -191,7 +191,7 @@ fn help_short_flag() {
           --native-tls                 Whether to load TLS certificates from the platform's native
                                        certificate store [env: UV_NATIVE_TLS=]
           --offline                    Disable network access
-          --no-progress                Hide all progress outputs
+          --no-progress                Hide all progress outputs [env: UV_NO_PROGRESS=]
           --directory <DIRECTORY>      Change to the given directory prior to running the command
           --project <PROJECT>          Run the command within the given project directory
           --config-file <CONFIG_FILE>  The path to a `uv.toml` file to use for configuration [env:
@@ -211,7 +211,7 @@ fn help_short_flag() {
 fn help_subcommand() {
     let context = TestContext::new_with_versions(&[]);
 
-    uv_snapshot!(context.filters(), context.help().arg("python"), @r##"
+    uv_snapshot!(context.filters(), context.help().arg("python"), @r###"
     success: true
     exit_code: 0
     ----- stdout -----
@@ -344,6 +344,8 @@ fn help_subcommand() {
               Hide all progress outputs.
               
               For example, spinners or progress bars.
+              
+              [env: UV_NO_PROGRESS=]
 
           --directory <DIRECTORY>
               Change to the given directory prior to running the command.
@@ -392,14 +394,14 @@ fn help_subcommand() {
 
 
     ----- stderr -----
-    "##);
+    "###);
 }
 
 #[test]
 fn help_subsubcommand() {
     let context = TestContext::new_with_versions(&[]);
 
-    uv_snapshot!(context.filters(), context.help().arg("python").arg("install"), @r##"
+    uv_snapshot!(context.filters(), context.help().arg("python").arg("install"), @r###"
     success: true
     exit_code: 0
     ----- stdout -----
@@ -514,6 +516,8 @@ fn help_subsubcommand() {
               Hide all progress outputs.
               
               For example, spinners or progress bars.
+              
+              [env: UV_NO_PROGRESS=]
 
           --directory <DIRECTORY>
               Change to the given directory prior to running the command.
@@ -560,7 +564,7 @@ fn help_subsubcommand() {
 
 
     ----- stderr -----
-    "##);
+    "###);
 }
 
 #[test]
@@ -603,7 +607,7 @@ fn help_flag_subcommand() {
           --native-tls                 Whether to load TLS certificates from the platform's native
                                        certificate store [env: UV_NATIVE_TLS=]
           --offline                    Disable network access
-          --no-progress                Hide all progress outputs
+          --no-progress                Hide all progress outputs [env: UV_NO_PROGRESS=]
           --directory <DIRECTORY>      Change to the given directory prior to running the command
           --project <PROJECT>          Run the command within the given project directory
           --config-file <CONFIG_FILE>  The path to a `uv.toml` file to use for configuration [env:
@@ -657,7 +661,7 @@ fn help_flag_subsubcommand() {
           --native-tls                 Whether to load TLS certificates from the platform's native
                                        certificate store [env: UV_NATIVE_TLS=]
           --offline                    Disable network access
-          --no-progress                Hide all progress outputs
+          --no-progress                Hide all progress outputs [env: UV_NO_PROGRESS=]
           --directory <DIRECTORY>      Change to the given directory prior to running the command
           --project <PROJECT>          Run the command within the given project directory
           --config-file <CONFIG_FILE>  The path to a `uv.toml` file to use for configuration [env:
@@ -803,7 +807,7 @@ fn help_with_global_option() {
           --native-tls                 Whether to load TLS certificates from the platform's native
                                        certificate store [env: UV_NATIVE_TLS=]
           --offline                    Disable network access
-          --no-progress                Hide all progress outputs
+          --no-progress                Hide all progress outputs [env: UV_NO_PROGRESS=]
           --directory <DIRECTORY>      Change to the given directory prior to running the command
           --project <PROJECT>          Run the command within the given project directory
           --config-file <CONFIG_FILE>  The path to a `uv.toml` file to use for configuration [env:
@@ -908,7 +912,7 @@ fn help_with_no_pager() {
           --native-tls                 Whether to load TLS certificates from the platform's native
                                        certificate store [env: UV_NATIVE_TLS=]
           --offline                    Disable network access
-          --no-progress                Hide all progress outputs
+          --no-progress                Hide all progress outputs [env: UV_NO_PROGRESS=]
           --directory <DIRECTORY>      Change to the given directory prior to running the command
           --project <PROJECT>          Run the command within the given project directory
           --config-file <CONFIG_FILE>  The path to a `uv.toml` file to use for configuration [env:

docs/configuration/environment.md

@@ -151,5 +151,6 @@ In addition, uv respects the following environment variables:
   least-recent non-EOL macOS version at time of writing.
 - `NO_COLOR`: Disable colors. Takes precedence over `FORCE_COLOR`. See
   [no-color.org](https://no-color.org).
+- `UV_NO_PROGRESS`: Disable progress indicators like spinners and progress bars.
 - `FORCE_COLOR`: Enforce colors regardless of TTY support. See
   [force-color.org](https://force-color.org).