fix(uv): Don't just delete windows whls

e2e/MODULE.bazel

@@ -122,4 +122,13 @@ uv.lockfile(
     hub_name = "pypi",
     venv_name = "psql",
 )
+uv.declare_venv(
+    hub_name = "pypi",
+    venv_name = "no-sdist",
+)
+uv.lockfile(
+    src = "//cases/uv-no-sdist-754:uv.lock",
+    hub_name = "pypi",
+    venv_name = "no-sdist",
+)
 use_repo(uv, "pypi")

e2e/cases/uv-no-sdist-754/BUILD.bazel

@@ -0,0 +1,26 @@
+load("@aspect_bazel_lib//lib:transitions.bzl", "platform_transition_filegroup")
+
+platform(
+    name = "amd64_windows",
+    constraint_values = [
+        "@platforms//os:windows",
+        "@platforms//cpu:x86_64",
+    ],
+    flags = [
+        "--@aspect_rules_py//uv/private/constraints/platform:platform_libc=msvc",
+        "--@aspect_rules_py//uv/private/constraints/platform:platform_version=1.0",
+        "--@rules_rust//:extra_rustc_flag=-Cstrip=debuginfo",
+        "--@rules_rust//rust/settings:lto=fat",
+        "--stripopt=--strip-all",
+        # Note that we have to set this
+        "--@pypi//venv=no-sdist",
+    ],
+)
+
+platform_transition_filegroup(
+    name = "test",
+    srcs = [
+        "@pypi//pywin32",
+    ],
+    target_platform = ":amd64_windows",
+)

uv/private/constraints/platform/BUILD.bazel

@@ -66,6 +66,7 @@ config_setting(
     flag_values = {
         ":platform_libc": "musl",
     },
+    visibility = ["//visibility:public"],
 )
 
 config_setting(
@@ -76,7 +77,13 @@ config_setting(
     visibility = ["//visibility:public"],
 )
 
-# TODO: Windows
+config_setting(
+    name = "is_msvc",
+    flag_values = {
+        ":platform_libc": "msvc",
+    },
+    visibility = ["//visibility:public"],
+)
 
 generate(
     visibility = ["//visibility:public"],

uv/private/constraints/platform/defs.bzl

@@ -32,7 +32,8 @@ def supported_platform(platform_tag):
         platform_tag == "any" or
         platform_tag.startswith("macosx_") or
         platform_tag.startswith("manylinux_") or
-        platform_tag.startswith("musllinux_")
+        platform_tag.startswith("musllinux_") or
+        platform_tag.startswith("win")
     )
 
 # Adapted from rules_python's config_settings.bzl

uv/private/constraints/platform/macro.bzl

@@ -212,9 +212,47 @@ def generate_musllinux(visibility):
                 visibility = visibility,
             )
 
+# buildifier: disable=unnamed-macro
+# buildifier: disable=function-docstring
+def generate_windows(visibility):
+    native.config_setting(
+        name = "win32",
+        flag_values = {
+            ":platform_libc": "msvc",
+        },
+        constraint_values = [
+            "@platforms//os:windows",
+            "@platforms//cpu:x86_64",
+        ],
+        visibility = visibility,
+    )
+    native.config_setting(
+        name = "win_amd64",
+        flag_values = {
+            ":platform_libc": "msvc",
+        },
+        constraint_values = [
+            "@platforms//os:windows",
+            "@platforms//cpu:x86_64",
+        ],
+        visibility = visibility,
+    )
+    native.config_setting(
+        name = "win_arm64",
+        flag_values = {
+            ":platform_libc": "msvc",
+        },
+        constraint_values = [
+            "@platforms//os:windows",
+            "@platforms//cpu:aarch64",
+        ],
+        visibility = visibility,
+    )
+
 # buildifier: disable=unnamed-macro
 # buildifier: disable=function-docstring
 def generate(visibility):
     generate_macos(visibility = visibility)
     generate_manylinux(visibility = visibility)
     generate_musllinux(visibility = visibility)
+    generate_windows(visibility = visibility)

uv/private/whl_install/repository.bzl

@@ -14,7 +14,7 @@ load("//uv/private/constraints/python:defs.bzl", "supported_python")
 def _format_arms(d):
     content = ["        \"{}\": \"{}\"".format(k, v) for k, v in d.items()]
     content = ",\n".join(content)
-    return "{\n" + content + "\n    }"
+    return "{\n" + content + "\n   }"
 
 def _select_key(pair):
     """Force (triple, target) pairs into a orderable form.
@@ -131,20 +131,32 @@ def _whl_install_impl(repository_ctx):
             "//conditions:default": str(repository_ctx.attr.sbuild),
         }
 
+    else:
+        content.append("""
+filegroup(
+    name = "_no_sbuild",
+    srcs = [],
+    target_compatible_with = ["@platforms//:incompatible"]
+)
+""")
+        select_arms = select_arms | {
+            "//conditions:default": ":_no_sbuild",
+        }
+
     content.append(
         """
 select_chain(
-   name = "whl",
-   arms = {},
-   visibility = ["//visibility:private"],
+    name = "whl",
+    arms = {},
+    visibility = ["//visibility:private"],
 )
 py_library(
-   name = "whl_lib",
-   srcs = [],
-   data = [
-        ":whl"
-   ],
-   visibility = ["//visibility:private"],
+    name = "whl_lib",
+    srcs = [],
+    data = [
+         ":whl"
+    ],
+    visibility = ["//visibility:private"],
 )
 """.format(
             _format_arms(select_arms),
@@ -155,17 +167,17 @@ py_library(
     content.append(
         """
 whl_install(
-   name = "actual_install",
-   src = ":whl",
-   visibility = ["//visibility:private"],
+    name = "actual_install",
+    src = ":whl",
+    visibility = ["//visibility:private"],
 )
 alias(
-   name = "install",
-   actual = select({
-        "@aspect_rules_py//uv/private/constraints:libs_are_libs": ":actual_install",
-        "@aspect_rules_py//uv/private/constraints:libs_are_whls": ":whl_lib",
-   }),
-   visibility = ["//visibility:public"],
+    name = "install",
+    actual = select({
+         "@aspect_rules_py//uv/private/constraints:libs_are_libs": ":actual_install",
+         "@aspect_rules_py//uv/private/constraints:libs_are_whls": ":whl_lib",
+    }),
+    visibility = ["//visibility:public"],
 )
 """,
     )