Add patching example

Author: P1n3appl3

examples/crate_universe/vendor_local_patching/.gitignore

@@ -0,0 +1,3 @@
+# Ignore everything but the `BUILD` files within the vendored directories
+vendor/*/*
+!vendor/*/BUILD.bazel

examples/crate_universe/vendor_local_patching/BUILD.bazel

@@ -0,0 +1,26 @@
+load("@rules_rust//crate_universe:defs.bzl", "crate", "crates_vendor")
+load("@rules_rust//rust:defs.bzl", "rust_binary", "rust_test")
+
+crates_vendor(
+    name = "vendor",
+    cargo_lockfile = ":Cargo.lock",
+    manifests = [":Cargo.toml"],
+    mode = "local",
+    # We don't support wasi
+    supported_platform_triples = [
+        "x86_64-unknown-linux-gnu",
+        "aarch64-unknown-linux-gnu",
+        "x86_64-apple-darwin",
+        "x86_64-pc-windows-msvc",
+        "x86_64-fuchsia",
+        "aarch64-fuchsia",
+    ],
+    vendor_path = "vendor",
+)
+
+rust_binary(
+    name = "bin",
+    srcs = ["src/main.rs"],
+    deps = ["//vendor_local_patching/vendor:rand"],
+    edition = "2021",
+)

examples/crate_universe/vendor_local_patching/Cargo.lock

@@ -0,0 +1,9 @@
+[package]
+name = "my_third_party"
+version = "0.1.0"
+
+[dependencies]
+rand = "0.8.5"
+
+[patch.crates-io]
+wasi = { path = "empty_wasi" }

examples/crate_universe/vendor_local_patching/Cargo.toml

@@ -0,0 +1,7 @@
+filegroup(
+    name = "wasi",
+    srcs = glob(["**/*.rs"]),
+    visibility = ["//visibility:public"],
+)
+
+exports_files(["src/lib.rs"])

examples/crate_universe/vendor_local_patching/empty_wasi/BUILD.bazel

@@ -0,0 +1,3 @@
+[package]
+name = "wasi"
+version = "0.11.0+wasi-snapshot-preview1"

examples/crate_universe/vendor_local_patching/empty_wasi/Cargo.toml

@@ -0,0 +1,3 @@
+fn main() {
+    println!("random number: {}", rand::random::<f32>());
+}

examples/crate_universe/vendor_local_patching/empty_wasi/src/lib.rs

@@ -0,0 +1,31 @@
+###############################################################################
+# @generated
+# DO NOT MODIFY: This file is auto-generated by a crate_universe tool. To
+# regenerate this file, run the following:
+#
+#     bazel run @//vendor_local_patching:vendor
+###############################################################################
+
+package(default_visibility = ["//visibility:public"])
+
+exports_files(
+    [
+        "cargo-bazel.json",
+        "defs.bzl",
+    ] + glob(["*.bazel"]),
+)
+
+filegroup(
+    name = "srcs",
+    srcs = glob([
+        "*.bazel",
+        "*.bzl",
+    ]),
+)
+
+# Workspace Member Dependencies
+alias(
+    name = "rand",
+    actual = "//vendor_local_patching/vendor/rand-0.8.5:rand",
+    tags = ["manual"],
+)

examples/crate_universe/vendor_local_patching/src/main.rs

@@ -0,0 +1,41 @@
+###############################################################################
+# @generated
+# DO NOT MODIFY: This file is auto-generated by a crate_universe tool. To
+# regenerate this file, run the following:
+#
+#     bazel run @//vendor_local_patching:vendor
+###############################################################################
+
+load("@rules_rust//rust:defs.bzl", "rust_library")
+
+package(default_visibility = ["//visibility:public"])
+
+# licenses([
+#     "TODO",  # MIT/Apache-2.0
+# ])
+
+rust_library(
+    name = "cfg_if",
+    srcs = glob(["**/*.rs"]),
+    compile_data = glob(
+        include = ["**"],
+        exclude = [
+            "**/* *",
+            "BUILD",
+            "BUILD.bazel",
+            "WORKSPACE",
+            "WORKSPACE.bazel",
+        ],
+    ),
+    crate_root = "src/lib.rs",
+    edition = "2018",
+    rustc_flags = ["--cap-lints=allow"],
+    tags = [
+        "cargo-bazel",
+        "crate-name=cfg-if",
+        "manual",
+        "noclippy",
+        "norustfmt",
+    ],
+    version = "1.0.0",
+)