Set up to build Rust code with dependencies
cargo-raze is like gazelle, but for Rust code. It generates BUILD files
for external dependencies.
I'm putting this in a separate change from running it and setting up CI
to do that for ease of telling what's generated vs not.
Change-Id: I87a07255dca475514cae7bdbf9b0b62ce46e2512
Signed-off-by: Brian Silverman <bsilver16384@gmail.com>
diff --git a/tools/rust/BUILD b/tools/rust/BUILD
index e58bb19..fccc3e4 100644
--- a/tools/rust/BUILD
+++ b/tools/rust/BUILD
@@ -119,3 +119,16 @@
toolchain = ":noop_rust_toolchain_impl",
toolchain_type = "@rules_rust//rust:toolchain",
)
+
+'''
+# TODO(Brian): Uncomment in the next change once dependencies exist.
+rust_binary(
+ name = "tweak_cargo_raze_output",
+ srcs = ["tweak_cargo_raze_output.rs"],
+ visibility = ["//visibility:public"],
+ deps = [
+ "//third_party/cargo:anyhow",
+ "//third_party/cargo:toml",
+ ],
+)
+'''
diff --git a/tools/rust/tweak_cargo_raze_output.rs b/tools/rust/tweak_cargo_raze_output.rs
new file mode 100644
index 0000000..88a9d0a
--- /dev/null
+++ b/tools/rust/tweak_cargo_raze_output.rs
@@ -0,0 +1,102 @@
+//! A tool that postprocesses cargo-raze output to do what we want.
+//!
+//! Currently this is limited to removing extraneous BUILD files which cargo-raze places in all the
+//! third_party packages we feed to it, which we don't want to use. We're hand-writing BUILD files
+//! for these dependencies, without intending them to be used as separate Bazel workspaces, so it's
+//! easiest for them to all reference the top-level //third_party/cargo package.
+use std::{
+ env, fs,
+ io::{self, ErrorKind},
+ path::Path,
+};
+
+use anyhow::Context;
+use toml::Value;
+
+fn filter_not_found(result: io::Result<()>) -> io::Result<()> {
+ match result {
+ Err(e) if matches!(e.kind(), ErrorKind::NotFound) => Ok(()),
+ r => r,
+ }
+}
+
+fn main() -> anyhow::Result<()> {
+ let argv: Vec<_> = env::args().collect();
+ let workspace_path = Path::new(&argv[1]);
+ let cargo_toml_path = workspace_path.join("Cargo.toml");
+ eprintln!("Loading Cargo.toml from {:?}", cargo_toml_path);
+ let cargo_toml_contents = fs::read(&cargo_toml_path)
+ .with_context(|| format!("Failed to read Cargo.toml: {:?}", cargo_toml_path))?;
+ let cargo_toml_contents = std::str::from_utf8(&cargo_toml_contents).with_context(|| {
+ format!(
+ "Failed to interpret Cargo.toml contents as UTF-8: {:?}",
+ cargo_toml_path
+ )
+ })?;
+ let cargo_toml: Value = cargo_toml_contents
+ .parse()
+ .with_context(|| format!("Failed to parse Cargo.toml contents: {:?}", cargo_toml_path))?;
+
+ let package_aliases_dir = cargo_toml["workspace"]["metadata"]["raze"]["package_aliases_dir"]
+ .as_str()
+ .with_context(|| {
+ format!(
+ "Found non-string package_aliases_dir in Cargo.toml: {:?}",
+ cargo_toml_path
+ )
+ })?;
+
+ let workspace_members = cargo_toml["workspace"]["members"]
+ .as_array()
+ .with_context(|| {
+ format!(
+ "Did not find workspace members in Cargo.toml: {:?}",
+ cargo_toml_path
+ )
+ })?;
+ for member in workspace_members.iter() {
+ let member = member.as_str().with_context(|| {
+ format!(
+ "Found non-string workspace member in Cargo.toml: {:?}",
+ cargo_toml_path
+ )
+ })?;
+
+ // First delete the BUILD file.
+ let member_build = workspace_path
+ .join(member)
+ .join(package_aliases_dir)
+ .join("BUILD.bazel");
+ filter_not_found(fs::remove_file(&member_build)).with_context(|| {
+ format!(
+ "Failed to remove workspace member BUILD.bazel: {:?}",
+ member_build
+ )
+ })?;
+
+ // Then go and delete each folder in reverse order, but only if it's now empty to avoid
+ // overeager deletion. The file we're deleting should be the only thing in these folders,
+ // but if somebody wrote something else for some reason then we don't want to silently
+ // delete it.
+ let mut folder_path = workspace_path.join(member);
+ for d in Path::new(package_aliases_dir)
+ .components()
+ .scan(&mut folder_path, |a, b| {
+ **a = a.join(b);
+ Some(a.clone())
+ })
+ .collect::<Vec<_>>()
+ .iter()
+ .rev()
+ {
+ filter_not_found(fs::remove_dir(d)).with_context(|| {
+ format!(
+ "Failed to remove workspace member package_aliases directory: {:?}",
+ d
+ )
+ })?;
+ }
+ }
+ eprintln!("All done");
+ Ok(())
+}