Introduce uv-production-flate2-backend for automatic rust_backend usa…

…ge on s390x and zlib-ng everywhere else (but only in production)

.github/workflows/build-binaries.yml

@@ -378,7 +378,7 @@ jobs:
           target: ${{ matrix.platform.target }}
           manylinux: auto
           docker-options: ${{ matrix.platform.maturin_docker_options }}
-          args: --release --locked --out dist --no-default-features --features flate2/rust_backend --features production
+          args: --release --locked --out dist --no-default-features --features production
       - uses: uraimo/run-on-arch-action@v2
         if: matrix.platform.arch != 'ppc64'
         name: Test wheel

Cargo.toml

@@ -57,6 +57,7 @@ uv-virtualenv = { path = "crates/uv-virtualenv" }
 uv-warnings = { path = "crates/uv-warnings" }
 uv-workspace = { path = "crates/uv-workspace" }
 uv-production-memory-allocator = { path = "crates/uv-production-memory-allocator" }
+uv-production-flate2-backend = { path = "crates/uv-production-flate2-backend" }
 
 anstream = { version = "0.6.13" }
 anyhow = { version = "1.0.80" }
@@ -168,7 +169,7 @@ xz2 = { version = "0.1.7" }
 zip = { version = "0.6.6", default-features = false, features = ["deflate"] }
 
 [workspace.metadata.cargo-shear]
-ignored = ["flate2", "xz2", "uv-production-memory-allocator"]
+ignored = ["flate2", "xz2", "uv-production-memory-allocator", "uv-production-flate2-backend"]
 
 [patch.crates-io]
 # For pyproject-toml

crates/uv-production-flate2-backend/Cargo.toml

@@ -0,0 +1,19 @@
+[package]
+name = "uv-production-flate2-backend"
+version = "0.1.0"
+edition.workspace = true
+rust-version.workspace = true
+homepage.workspace = true
+documentation.workspace = true
+repository.workspace = true
+authors.workspace = true
+license.workspace = true
+
+[target.'cfg(not(target_arch = "s390x"))'.dependencies]
+flate2 = { version = "1.0.28", default-features = false, features = ["zlib-ng"] }
+
+[target.'cfg(target_arch = "s390x")'.dependencies]
+flate2 = { version = "1.0.28", default-features = false, features = ["rust_backend"] }
+
+[lints]
+workspace = true

crates/uv-production-flate2-backend/src/lib.rs

@@ -0,0 +1,3 @@
+//! The sole purpose of this crate is to enable one of
+//! `flate2/zlib-ng` (on most platforms) or `flate2/rust_backend`
+//! (on s390x)

crates/uv/Cargo.toml

@@ -44,6 +44,7 @@ uv-virtualenv = { workspace = true }
 uv-warnings = { workspace = true }
 uv-workspace = { workspace = true }
 uv-production-memory-allocator = { workspace = true, optional = true }
+uv-production-flate2-backend = { workspace = true, optional = true }
 
 anstream = { workspace = true }
 anyhow = { workspace = true }
@@ -94,13 +95,15 @@ tempfile = { workspace = true }
 zip = { workspace = true }
 
 [package.metadata.cargo-shear]
-ignored = ["flate2", "uv-production-memory-allocator"]
+ignored = ["flate2", "uv-production-memory-allocator", "uv-production-flate2-backend"]
 
 [features]
-default = ["flate2/zlib-ng", "python", "pypi", "git"]
+default = ["python", "pypi", "git"]
 # Use better memory allocators, etc. — also turns-on self-update.
-production = ["self-update", "production-memory-allocator", "uv-distribution/production"]
+production = ["self-update", "production-memory-allocator", "production-flate2-backend", "uv-distribution/production"]
 production-memory-allocator = ["dep:uv-production-memory-allocator"]
+production-flate2-backend = ["dep:uv-production-flate2-backend"]
+
 # Introduces a dependency on a local Python installation.
 python = []
 # Introduces a dependency on a local Python installation with specific patch versions.