Adds spk-proto crate with flatbuffers schema for future index and package data.

Adds v0 SolverPackageSpec as a package implementation backed by a flatbuffer.
Adds fb_converter functions for converting spk schema objects into and
out of flatbuffer objects.

Signed-off-by: David Gilligan-Cook <dcook@imageworks.com>

Author: dcookspi

Cargo.lock

@@ -16,6 +16,7 @@ members = [
     "crates/spk-config",
     "crates/spk-exec",
     "crates/spk-launcher",
+    "crates/spk-proto",
     "crates/spk-schema",
     "crates/spk-schema/crates/*",
     "crates/spk-solve",
@@ -136,6 +137,7 @@ spk-cmd-repo = { path = "crates/spk-cli/cmd-repo" }
 spk-cmd-test = { path = "crates/spk-cli/cmd-test" }
 spk-config = { path = "crates/spk-config" }
 spk-exec = { path = "crates/spk-exec" }
+spk-proto = { path = "crates/spk-proto" }
 spk-schema = { path = "crates/spk-schema" }
 spk-schema-foundation = { path = "crates/spk-schema/crates/foundation" }
 spk-schema-tera = { path = "crates/spk-schema/crates/tera" }

Cargo.toml

@@ -0,0 +1,31 @@
+[package]
+authors = { workspace = true }
+edition = { workspace = true }
+name = "spk-proto"
+version = { workspace = true }
+license-file = { workspace = true }
+homepage = { workspace = true }
+repository = { workspace = true }
+readme = { workspace = true }
+description = { workspace = true }
+
+[lints]
+workspace = true
+
+[features]
+serde = ["dep:serde"]
+
+[dependencies]
+data-encoding = { workspace = true }
+flatbuffers = { workspace = true }
+futures = { workspace = true }
+miette = { workspace = true }
+serde = { workspace = true, optional = true }
+thiserror = { workspace = true }
+
+[build-dependencies]
+flatc-rust = "0.2"
+
+[dev-dependencies]
+ring = { workspace = true }
+rstest = { workspace = true }

crates/spk-proto/Cargo.toml

@@ -0,0 +1,31 @@
+// Copyright (c) Contributors to the SPK project.
+// SPDX-License-Identifier: Apache-2.0
+// https://github.com/spkenv/spk
+
+use std::env;
+use std::path::{Path, PathBuf};
+
+fn main() {
+    println!("cargo:rerun-if-changed=schema/spk.fbs");
+
+    let cmd = match std::env::var_os("FLATC") {
+        Some(exe) => flatc_rust::Flatc::from_path(exe),
+        None => flatc_rust::Flatc::from_env_path(),
+    };
+
+    let out_dir = env::var("OUT_DIR").unwrap();
+
+    cmd.run(flatc_rust::Args {
+        lang: "rust",
+        inputs: &[Path::new("schema/spk.fbs")],
+        out_dir: &PathBuf::from(&out_dir),
+        ..Default::default()
+    })
+    .expect("schema compiler command");
+
+    let generated_file = PathBuf::from(out_dir).join("spk_generated.rs");
+    println!(
+        "cargo:rerun-if-changed=schema/spk.fbs generated file: {}",
+        generated_file.display()
+    );
+}