From f5b39298f3b9cbf12b118520fb02162d1a893593 Mon Sep 17 00:00:00 2001
From: Charlie Marsh <charlie.r.marsh@gmail.com>
Date: Fri, 23 May 2025 19:57:09 -0400
Subject: [PATCH] Omit license-file key for Metadata 2.1

---
 Cargo.lock                   |  1 +
 crates/uv-publish/Cargo.toml |  1 +
 crates/uv-publish/src/lib.rs | 14 +++++++++++++-
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/Cargo.lock b/Cargo.lock
index 053b113a4..6716b6a78 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -5469,6 +5469,7 @@ dependencies = [
  "uv-extract",
  "uv-fs",
  "uv-metadata",
+ "uv-pep440",
  "uv-pypi-types",
  "uv-static",
  "uv-warnings",
diff --git a/crates/uv-publish/Cargo.toml b/crates/uv-publish/Cargo.toml
index 254d83d03..02bb5fc4e 100644
--- a/crates/uv-publish/Cargo.toml
+++ b/crates/uv-publish/Cargo.toml
@@ -22,6 +22,7 @@ uv-distribution-types = { workspace = true }
 uv-extract = { workspace = true }
 uv-fs = { workspace = true }
 uv-metadata = { workspace = true }
+uv-pep440 = { workspace = true }
 uv-pypi-types = { workspace = true }
 uv-static = { workspace = true }
 uv-warnings = { workspace = true }
diff --git a/crates/uv-publish/src/lib.rs b/crates/uv-publish/src/lib.rs
index 72e4d102a..a7fe3d74d 100644
--- a/crates/uv-publish/src/lib.rs
+++ b/crates/uv-publish/src/lib.rs
@@ -1,6 +1,7 @@
 mod trusted_publishing;
 
 use std::path::{Path, PathBuf};
+use std::str::FromStr;
 use std::sync::Arc;
 use std::time::{Duration, SystemTime};
 use std::{env, fmt, io};
@@ -37,6 +38,7 @@ use uv_distribution_types::{IndexCapabilities, IndexUrl};
 use uv_extract::hash::{HashReader, Hasher};
 use uv_fs::{ProgressReader, Simplified};
 use uv_metadata::read_metadata_async_seek;
+use uv_pep440::Version;
 use uv_pypi_types::{HashAlgorithm, HashDigest, Metadata23, MetadataError};
 use uv_static::EnvVars;
 use uv_warnings::{warn_user, warn_user_once};
@@ -732,7 +734,6 @@ async fn form_metadata(
 
     add_vec("classifiers", classifiers);
     add_vec("dynamic", dynamic);
-    add_vec("license_file", license_files);
     add_vec("obsoletes_dist", obsoletes_dist);
     add_vec("platform", platforms);
     add_vec("project_urls", project_urls);
@@ -741,6 +742,17 @@ async fn form_metadata(
     add_vec("requires_dist", requires_dist);
     add_vec("requires_external", requires_external);
 
+    // See: https://github.com/pypa/setuptools/issues/4759
+    if Version::from_str(&metadata_version).is_ok_and(|version| version == Version::new([2, 1])) {
+        if !license_files.is_empty() {
+            warn!(
+                "`license_file` was introduced in Metadata 2.4, but the metadata version is {metadata_version}; omitting..."
+            );
+        }
+    } else {
+        add_vec("license_file", license_files);
+    }
+
     Ok(form_metadata)
 }