Build backend: Add source tree -> source dist -> wheel tests (#9091)

A first milestone: source tree -> source dist -> wheel -> install works.
This PR adds a test for this.

There's obviously a lot still missing, including basics such as the
Readme inclusion.

crates/uv-build-backend/src/lib.rs

@@ -513,16 +513,15 @@ pub fn build_source_dist(
         let relative = entry
             .path()
             .strip_prefix(source_tree)
-            .expect("walkdir starts with root")
-            .to_path_buf();
+            .expect("walkdir starts with root");
 
         // Fast path: Don't descend into a directory that can't be included. This is the most
         // important performance optimization, it avoids descending into directories such as
         // `.venv`. While walkdir is generally cheap, we still avoid traversing large data
         // directories that often exist on the top level of a project. This is especially noticeable
         // on network file systems with high latencies per operation (while contiguous reading may
         // still be fast).
-        include_matcher.match_directory(&relative) && !exclude_matcher.is_match(&relative)
+        include_matcher.match_directory(relative) && !exclude_matcher.is_match(relative)
     }) {
         let entry = entry.map_err(|err| Error::WalkDir {
             root: source_tree.to_path_buf(),
@@ -532,15 +531,14 @@ pub fn build_source_dist(
         let relative = entry
             .path()
             .strip_prefix(source_tree)
-            .expect("walkdir starts with root")
-            .to_path_buf();
+            .expect("walkdir starts with root");
 
-        if !include_matcher.match_path(&relative) || exclude_matcher.is_match(&relative) {
+        if !include_matcher.match_path(relative) || exclude_matcher.is_match(relative) {
             trace!("Excluding {}", relative.user_display());
             continue;
         };
 
-        add_source_dist_entry(&mut tar, &entry, &top_level, &source_dist_path, &relative)?;
+        add_source_dist_entry(&mut tar, &entry, &top_level, &source_dist_path, relative)?;
     }
 
     tar.finish()

crates/uv-build-backend/src/tests.rs

@@ -1,7 +1,9 @@
 use super::*;
+use indoc::indoc;
 use insta::assert_snapshot;
 use std::str::FromStr;
 use tempfile::TempDir;
+use uv_fs::copy_dir_all;
 use uv_normalize::PackageName;
 use uv_pep440::Version;
 
@@ -28,26 +30,34 @@ fn test_wheel() {
 #[test]
 fn test_record() {
     let record = vec![RecordEntry {
-        path: "uv_backend/__init__.py".to_string(),
+        path: "built_by_uv/__init__.py".to_string(),
         hash: "89f869e53a3a0061a52c0233e6442d4d72de80a8a2d3406d9ea0bfd397ed7865".to_string(),
         size: 37,
     }];
 
     let mut writer = Vec::new();
-    write_record(&mut writer, "uv_backend-0.1.0", record).unwrap();
+    write_record(&mut writer, "built_by_uv-0.1.0", record).unwrap();
     assert_snapshot!(String::from_utf8(writer).unwrap(), @r"
-            uv_backend/__init__.py,sha256=89f869e53a3a0061a52c0233e6442d4d72de80a8a2d3406d9ea0bfd397ed7865,37
-            uv_backend-0.1.0/RECORD,,
+            built_by_uv/__init__.py,sha256=89f869e53a3a0061a52c0233e6442d4d72de80a8a2d3406d9ea0bfd397ed7865,37
+            built_by_uv-0.1.0/RECORD,,
         ");
 }
 
 /// Check that we write deterministic wheels.
 #[test]
 fn test_determinism() {
+    let built_by_uv = Path::new("../../scripts/packages/built-by-uv");
+    let src = TempDir::new().unwrap();
+    for dir in ["src", "tests", "data-dir"] {
+        copy_dir_all(built_by_uv.join(dir), src.path().join(dir)).unwrap();
+    }
+    for dir in ["pyproject.toml", "README.md", "uv.lock"] {
+        fs_err::copy(built_by_uv.join(dir), src.path().join(dir)).unwrap();
+    }
+
     let temp1 = TempDir::new().unwrap();
-    let uv_backend = Path::new("../../scripts/packages/uv_backend");
     build_wheel(
-        uv_backend,
+        src.path(),
         temp1.path(),
         None,
         WheelSettings::default(),
@@ -57,22 +67,26 @@ fn test_determinism() {
 
     // Touch the file to check that we don't serialize the last modified date.
     fs_err::write(
-        uv_backend.join("src/uv_backend/__init__.py"),
-        "def greet():\n    print(\"Hello 👋\")\n",
+        src.path().join("src/built_by_uv/__init__.py"),
+        indoc! {r#"
+        def greet() -> str:
+            return "Hello 👋"
+        "#
+        },
     )
     .unwrap();
 
     let temp2 = TempDir::new().unwrap();
     build_wheel(
-        uv_backend,
+        src.path(),
         temp2.path(),
         None,
         WheelSettings::default(),
         "1.0.0+test",
     )
     .unwrap();
 
-    let wheel_filename = "uv_backend-0.1.0-py3-none-any.whl";
+    let wheel_filename = "built_by_uv-0.1.0-py3-none-any.whl";
     assert_eq!(
         fs_err::read(temp1.path().join(wheel_filename)).unwrap(),
         fs_err::read(temp2.path().join(wheel_filename)).unwrap()
@@ -83,8 +97,8 @@ fn test_determinism() {
 #[test]
 fn test_prepare_metadata() {
     let metadata_dir = TempDir::new().unwrap();
-    let uv_backend = Path::new("../../scripts/packages/uv_backend");
-    metadata(uv_backend, metadata_dir.path(), "1.0.0+test").unwrap();
+    let built_by_uv = Path::new("../../scripts/packages/built-by-uv");
+    metadata(built_by_uv, metadata_dir.path(), "1.0.0+test").unwrap();
 
     let mut files: Vec<_> = WalkDir::new(metadata_dir.path())
         .into_iter()
@@ -101,38 +115,36 @@ fn test_prepare_metadata() {
         .collect();
     files.sort();
     assert_snapshot!(files.join("\n"), @r"
-        uv_backend-0.1.0.dist-info
-        uv_backend-0.1.0.dist-info/METADATA
-        uv_backend-0.1.0.dist-info/RECORD
-        uv_backend-0.1.0.dist-info/WHEEL
+        built_by_uv-0.1.0.dist-info
+        built_by_uv-0.1.0.dist-info/METADATA
+        built_by_uv-0.1.0.dist-info/RECORD
+        built_by_uv-0.1.0.dist-info/WHEEL
         ");
 
     let metadata_file = metadata_dir
         .path()
-        .join("uv_backend-0.1.0.dist-info/METADATA");
+        .join("built_by_uv-0.1.0.dist-info/METADATA");
     assert_snapshot!(fs_err::read_to_string(metadata_file).unwrap(), @r###"
-        Metadata-Version: 2.3
-        Name: uv-backend
-        Version: 0.1.0
-        Summary: Add your description here
-        Requires-Python: >=3.12
-        Description-Content-Type: text/markdown
-
-        # uv_backend
-
-        A simple package to be built with the uv build backend.
-        "###);
+    Metadata-Version: 2.3
+    Name: built-by-uv
+    Version: 0.1.0
+    Summary: A package to be built with the uv build backend that uses all features exposed by the build backend
+    Requires-Dist: anyio>=4,<5
+    Requires-Python: >=3.12
+    "###);
 
     let record_file = metadata_dir
         .path()
-        .join("uv_backend-0.1.0.dist-info/RECORD");
+        .join("built_by_uv-0.1.0.dist-info/RECORD");
     assert_snapshot!(fs_err::read_to_string(record_file).unwrap(), @r###"
-    uv_backend-0.1.0.dist-info/WHEEL,sha256=3da1bfa0e8fd1b6cc246aa0b2b44a35815596c600cb485c39a6f8c106c3d5a8d,83
-    uv_backend-0.1.0.dist-info/METADATA,sha256=e4a0d390317d7182f65ea978254c71ed283e0a4242150cf1c99a694b113ff68d,224
-    uv_backend-0.1.0.dist-info/RECORD,,
+    built_by_uv-0.1.0.dist-info/WHEEL,sha256=3da1bfa0e8fd1b6cc246aa0b2b44a35815596c600cb485c39a6f8c106c3d5a8d,83
+    built_by_uv-0.1.0.dist-info/METADATA,sha256=ec36b5ae8830bdd248e90aaf581483ffb057f9a2d0f41e19e585531e7d07c9dc,215
+    built_by_uv-0.1.0.dist-info/RECORD,,
     "###);
 
-    let wheel_file = metadata_dir.path().join("uv_backend-0.1.0.dist-info/WHEEL");
+    let wheel_file = metadata_dir
+        .path()
+        .join("built_by_uv-0.1.0.dist-info/WHEEL");
     assert_snapshot!(fs_err::read_to_string(wheel_file).unwrap(), @r###"
         Wheel-Version: 1.0
         Generator: uv 1.0.0+test

crates/uv-globfilter/src/glob_dir_filter.rs

@@ -238,20 +238,18 @@ mod tests {
                 let relative = entry
                     .path()
                     .strip_prefix(walkdir_root)
-                    .expect("walkdir starts with root")
-                    .to_path_buf();
+                    .expect("walkdir starts with root");
 
-                include_matcher.match_directory(&relative)
+                include_matcher.match_directory(relative)
             })
             .filter_map(|entry| {
                 let entry = entry.as_ref().unwrap();
                 // TODO(konsti): This should be prettier.
                 let relative = entry
                     .path()
                     .strip_prefix(walkdir_root)
-                    .expect("walkdir starts with root")
-                    .to_path_buf();
-                if include_matcher.match_path(&relative) {
+                    .expect("walkdir starts with root");
+                if include_matcher.match_path(relative) {
                     // Translate windows paths back to the unix fixture
                     Some(relative.to_str().unwrap().replace(MAIN_SEPARATOR, "/"))
                 } else {

crates/uv/Cargo.toml

@@ -105,13 +105,15 @@ base64 = { version = "0.22.1" }
 byteorder = { version = "1.5.0" }
 etcetera = { workspace = true }
 filetime = { version = "0.2.25" }
+flate2 = { workspace = true }
 ignore = { version = "0.4.23" }
 indoc = { version = "2.0.5" }
 insta = { version = "1.40.0", features = ["filters", "json"] }
 predicates = { version = "3.1.2" }
 regex = { workspace = true }
 reqwest = { workspace = true, features = ["blocking"], default-features = false }
 similar = { version = "2.6.0" }
+tar = { workspace = true }
 tempfile = { workspace = true }
 zip = { workspace = true }
 

crates/uv/tests/it/build_backend.rs

@@ -1,51 +1,141 @@
 use crate::common::{uv_snapshot, TestContext};
 use anyhow::Result;
 use assert_cmd::assert::OutputAssertExt;
+use flate2::bufread::GzDecoder;
+use fs_err::File;
+use indoc::indoc;
 use std::env;
+use std::io::BufReader;
 use std::path::Path;
 use tempfile::TempDir;
 use uv_static::EnvVars;
 
+const BUILT_BY_UV_TEST_SCRIPT: &str = indoc! {r#"
+    from built_by_uv import greet
+    from built_by_uv.arithmetic.circle import area
+
+    print(greet())
+    print(f"Area of a circle with r=2: {area(2)}")
+"#};
+
 /// Test that build backend works if we invoke it directly.
 ///
 /// We can't test end-to-end here including the PEP 517 bridge code since we don't have a uv wheel.
 #[test]
-fn uv_backend_direct() -> Result<()> {
+fn built_by_uv_direct_wheel() -> Result<()> {
     let context = TestContext::new("3.12");
-    let uv_backend = Path::new("../../scripts/packages/uv_backend");
+    let built_by_uv = Path::new("../../scripts/packages/built-by-uv");
 
     let temp_dir = TempDir::new()?;
 
     uv_snapshot!(context
         .build_backend()
         .arg("build-wheel")
         .arg(temp_dir.path())
-        .current_dir(uv_backend), @r###"
+        .current_dir(built_by_uv), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    built_by_uv-0.1.0-py3-none-any.whl
+
+    ----- stderr -----
+    "###);
+
+    context
+        .pip_install()
+        .arg(temp_dir.path().join("built_by_uv-0.1.0-py3-none-any.whl"))
+        .assert()
+        .success();
+
+    uv_snapshot!(context
+        .run()
+        .arg("python")
+        .arg("-c")
+        .arg(BUILT_BY_UV_TEST_SCRIPT)
+        // Python on windows
+        .env(EnvVars::PYTHONUTF8, "1"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    Hello 👋
+    Area of a circle with r=2: 12.56636
+
+    ----- stderr -----
+    "###);
+
+    Ok(())
+}
+
+/// Test that source tree -> source dist -> wheel works.
+///
+/// We can't test end-to-end here including the PEP 517 bridge code since we don't have a uv wheel,
+/// so we call the build backend directly.
+#[test]
+fn built_by_uv_direct() -> Result<()> {
+    let context = TestContext::new("3.12");
+    let built_by_uv = Path::new("../../scripts/packages/built-by-uv");
+
+    let sdist_dir = TempDir::new()?;
+
+    uv_snapshot!(context
+        .build_backend()
+        .arg("build-sdist")
+        .arg(sdist_dir.path())
+        .current_dir(built_by_uv), @r###"
     success: true
     exit_code: 0
     ----- stdout -----
-    uv_backend-0.1.0-py3-none-any.whl
+    built_by_uv-0.1.0.tar.gz
 
     ----- stderr -----
     "###);
 
+    let sdist_tree = TempDir::new()?;
+
+    let sdist_reader = BufReader::new(File::open(
+        sdist_dir.path().join("built_by_uv-0.1.0.tar.gz"),
+    )?);
+    tar::Archive::new(GzDecoder::new(sdist_reader)).unpack(sdist_tree.path())?;
+
+    drop(sdist_dir);
+
+    let wheel_dir = TempDir::new()?;
+
+    uv_snapshot!(context
+        .build_backend()
+        .arg("build-wheel")
+        .arg(wheel_dir.path())
+        .current_dir(sdist_tree.path().join("built-by-uv-0.1.0")), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    built_by_uv-0.1.0-py3-none-any.whl
+
+    ----- stderr -----
+    "###);
+
+    drop(sdist_tree);
+
     context
         .pip_install()
-        .arg(temp_dir.path().join("uv_backend-0.1.0-py3-none-any.whl"))
+        .arg(wheel_dir.path().join("built_by_uv-0.1.0-py3-none-any.whl"))
         .assert()
         .success();
 
+    drop(wheel_dir);
+
     uv_snapshot!(context
         .run()
         .arg("python")
         .arg("-c")
-        .arg("import uv_backend\nuv_backend.greet()")
+        .arg(BUILT_BY_UV_TEST_SCRIPT)
         // Python on windows
         .env(EnvVars::PYTHONUTF8, "1"), @r###"
     success: true
     exit_code: 0
     ----- stdout -----
     Hello 👋
+    Area of a circle with r=2: 12.56636
 
     ----- stderr -----
     "###);

scripts/packages/built-by-uv/.gitignore

@@ -0,0 +1,2 @@
+/dist/
+/build-root/

scripts/packages/built-by-uv/README.md

@@ -0,0 +1,3 @@
+# built_by_uv
+
+A package to be built with the uv build backend that uses all features exposed by the build backend.

scripts/packages/built-by-uv/data-dir/dont-include-me.txt

@@ -0,0 +1 @@
+We don't want this file in the source dist or wheel.