From 4c2d9e19b0a598919d1dd982e6edc552a799c1b7 Mon Sep 17 00:00:00 2001
From: Zanie Blue <contact@zanie.dev>
Date: Thu, 18 Sep 2025 09:08:58 -0500
Subject: [PATCH] Use `EnvVars` in linehaul (#15931)

---
 crates/uv-client/src/linehaul.rs | 12 +++++++++---
 crates/uv-static/src/env_vars.rs | 12 ++++++++++++
 2 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/crates/uv-client/src/linehaul.rs b/crates/uv-client/src/linehaul.rs
index d0df585ad..8d159152d 100644
--- a/crates/uv-client/src/linehaul.rs
+++ b/crates/uv-client/src/linehaul.rs
@@ -5,6 +5,7 @@ use tracing::instrument;
 
 use uv_pep508::MarkerEnvironment;
 use uv_platform_tags::{Os, Platform};
+use uv_static::EnvVars;
 use uv_version::version;
 
 #[derive(Debug, Clone, PartialEq, Deserialize, Serialize)]
@@ -64,9 +65,14 @@ impl LineHaul {
     #[instrument(name = "linehaul", skip_all)]
     pub fn new(markers: &MarkerEnvironment, platform: Option<&Platform>) -> Self {
         // https://github.com/pypa/pip/blob/24.0/src/pip/_internal/network/session.py#L87
-        let looks_like_ci = ["BUILD_BUILDID", "BUILD_ID", "CI", "PIP_IS_CI"]
-            .iter()
-            .find_map(|&var_name| env::var(var_name).ok().map(|_| true));
+        let looks_like_ci = [
+            EnvVars::BUILD_BUILDID,
+            EnvVars::BUILD_ID,
+            EnvVars::CI,
+            EnvVars::PIP_IS_CI,
+        ]
+        .iter()
+        .find_map(|&var_name| env::var(var_name).ok().map(|_| true));
 
         let libc = match platform.map(Platform::os) {
             Some(Os::Manylinux { major, minor }) => Some(Libc {
diff --git a/crates/uv-static/src/env_vars.rs b/crates/uv-static/src/env_vars.rs
index 799b73566..3216009bd 100644
--- a/crates/uv-static/src/env_vars.rs
+++ b/crates/uv-static/src/env_vars.rs
@@ -662,6 +662,18 @@ impl EnvVars {
     #[attr_hidden]
     pub const CI: &'static str = "CI";
 
+    /// Azure DevOps build identifier, used to detect CI environments.
+    #[attr_hidden]
+    pub const BUILD_BUILDID: &'static str = "BUILD_BUILDID";
+
+    /// Generic build identifier, used to detect CI environments.
+    #[attr_hidden]
+    pub const BUILD_ID: &'static str = "BUILD_ID";
+
+    /// Pip environment variable to indicate CI environment.
+    #[attr_hidden]
+    pub const PIP_IS_CI: &'static str = "PIP_IS_CI";
+
     /// Use to set the .netrc file location.
     pub const NETRC: &'static str = "NETRC";