Future-proof pip entrypoints special case (#1982)

Update #1918 to handle pypa/pip#12536, where pip
removed their python minor entrypoint. The pip test is semi-functional
since it builds pip from source instead of using a wheel with the wrong
entrypoint, we have to update it when this pip version has a release.

Closes #1593.

crates/install-wheel-rs/src/script.rs

@@ -88,14 +88,20 @@ pub(crate) fn scripts_from_ini(
     // Special case to generate versioned pip launchers.
     // https://github.com/pypa/pip/blob/3898741e29b7279e7bffe044ecfbe20f6a438b1e/src/pip/_internal/operations/install/wheel.py#L283
     // https://github.com/astral-sh/uv/issues/1593
-    for script in &mut console_scripts {
+    // Older pip versions have a wrong `pip3.x` launcher we have to remove, while newer pip versions
+    // (post https://github.com/pypa/pip/pull/12536) don't, ...
+    console_scripts.retain(|script| {
         let Some((left, right)) = script.name.split_once('.') else {
-            continue;
+            return true;
         };
-        if left != "pip3" || right.parse::<u8>().is_err() {
-            continue;
-        }
-        script.name = format!("pip3.{python_minor}");
+        !(left == "pip3" || right.parse::<u8>().is_ok())
+    });
+    // ... either has a `pip3` launcher we can use as template for the `pip3.x` users expect.
+    if let Some(pip_script) = console_scripts.iter().find(|script| script.name == "pip3") {
+        console_scripts.push(Script {
+            name: format!("pip3.{python_minor}"),
+            ..pip_script.clone()
+        });
     }
 
     Ok((console_scripts, gui_scripts))

crates/uv/tests/pip_sync.rs

@@ -7,6 +7,7 @@ use std::process::Command;
 
 use anyhow::Result;
 use assert_cmd::prelude::*;
+use assert_fs::fixture::ChildPath;
 use assert_fs::prelude::*;
 use indoc::indoc;
 use url::Url;
@@ -2780,36 +2781,32 @@ fn set_read_permissions() -> Result<()> {
 fn pip_entrypoints() -> Result<()> {
     let context = TestContext::new("3.12");
 
-    let requirements_txt = context.temp_dir.child("requirements.txt");
-    requirements_txt.touch()?;
-    requirements_txt.write_str("pip==24.0")?;
-
-    uv_snapshot!(command(&context)
-        .arg("requirements.txt")
-        .arg("--strict"), @r###"
-    success: true
-    exit_code: 0
-    ----- stdout -----
-
-    ----- stderr -----
-    Resolved 1 package in [TIME]
-    Downloaded 1 package in [TIME]
-    Installed 1 package in [TIME]
-     + pip==24.0
-    "###
-    );
-
-    let bin_dir = context.venv.join(if cfg!(unix) {
-        "bin"
-    } else if cfg!(windows) {
-        "Scripts"
-    } else {
-        unimplemented!("Only Windows and Unix are supported")
-    });
-    // Pip 24.0 contains a pip3.10 launcher.
-    // https://inspector.pypi.io/project/pip/24.0/packages/8a/6a/19e9fe04fca059ccf770861c7d5721ab4c2aebc539889e97c7977528a53b/pip-24.0-py3-none-any.whl/pip-24.0.dist-info/entry_points.txt
-    assert!(!bin_dir.join(format!("pip3.10{EXE_SUFFIX}")).exists());
-    assert!(bin_dir.join(format!("pip3.12{EXE_SUFFIX}")).exists());
+    // TODO(konstin): Remove git dep when the next pip version is released.
+    for pip_requirement in ["pip==24.0", "pip @ git+https://github.com/pypa/pip"] {
+        let requirements_txt = context.temp_dir.child("requirements.txt");
+        requirements_txt.touch()?;
+        requirements_txt.write_str(pip_requirement)?;
+
+        command(&context)
+            .arg("requirements.txt")
+            .arg("--strict")
+            .output()
+            .expect("Failed to install pip");
+
+        let bin_dir = context.venv.join(if cfg!(unix) {
+            "bin"
+        } else if cfg!(windows) {
+            "Scripts"
+        } else {
+            unimplemented!("Only Windows and Unix are supported")
+        });
+        // Pip 24.0 contains a pip3.10 launcher.
+        // https://inspector.pypi.io/project/pip/24.0/packages/8a/6a/19e9fe04fca059ccf770861c7d5721ab4c2aebc539889e97c7977528a53b/pip-24.0-py3-none-any.whl/pip-24.0.dist-info/entry_points.txt
+        ChildPath::new(bin_dir.join(format!("pip3.10{EXE_SUFFIX}")))
+            .assert(predicates::path::missing());
+        ChildPath::new(bin_dir.join(format!("pip3.12{EXE_SUFFIX}")))
+            .assert(predicates::path::exists());
+    }
 
     Ok(())
 }