rust: add validation of Python platform tag

This required teaching our code to parse the JSON file.

There are currently some failures due to a regression on macOS builds.

Author: indygreg

Cargo.lock

@@ -10,6 +10,8 @@ clap = "2.33"
 goblin = "0.3"
 lazy_static = "1.4"
 scroll = "0.10"
+serde_json = "1.0"
+serde = { version = "1.0", features = ["derive"] }
 tar = "0.4"
 version-compare = "0.0.11"
 zstd = "0.6"

Cargo.toml

@@ -0,0 +1,90 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+use {
+    anyhow::Result,
+    serde::Deserialize,
+    std::collections::{BTreeMap, HashMap},
+};
+
+#[derive(Debug, Deserialize)]
+pub struct LinkEntry {
+    pub name: String,
+    pub path_static: Option<String>,
+    pub path_dynamic: Option<String>,
+    pub framework: Option<bool>,
+    pub system: Option<bool>,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct PythonBuildExtensionInfo {
+    pub in_core: bool,
+    pub init_fn: String,
+    pub licenses: Option<Vec<String>>,
+    pub license_paths: Option<Vec<String>>,
+    pub license_public_domain: Option<bool>,
+    pub links: Vec<LinkEntry>,
+    pub objs: Vec<String>,
+    pub required: bool,
+    pub static_lib: Option<String>,
+    pub shared_lib: Option<String>,
+    pub variant: String,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct PythonBuildCoreInfo {
+    pub objs: Vec<String>,
+    pub links: Vec<LinkEntry>,
+    pub shared_lib: Option<String>,
+    pub static_lib: Option<String>,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct PythonBuildInfo {
+    pub core: PythonBuildCoreInfo,
+    pub extensions: BTreeMap<String, Vec<PythonBuildExtensionInfo>>,
+    pub inittab_object: String,
+    pub inittab_source: String,
+    pub inittab_cflags: Vec<String>,
+    pub object_file_format: String,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct PythonJsonMain {
+    pub version: String,
+    pub target_triple: String,
+    pub optimizations: String,
+    pub python_tag: String,
+    pub python_abi_tag: Option<String>,
+    pub python_config_vars: HashMap<String, String>,
+    pub python_platform_tag: String,
+    pub python_implementation_cache_tag: String,
+    pub python_implementation_hex_version: u64,
+    pub python_implementation_name: String,
+    pub python_implementation_version: Vec<String>,
+    pub python_version: String,
+    pub python_major_minor_version: String,
+    pub python_paths: HashMap<String, String>,
+    pub python_paths_abstract: HashMap<String, String>,
+    pub python_exe: String,
+    pub python_stdlib_test_packages: Vec<String>,
+    pub python_suffixes: HashMap<String, Vec<String>>,
+    pub python_bytecode_magic_number: String,
+    pub python_symbol_visibility: String,
+    pub python_extension_module_loading: Vec<String>,
+    pub libpython_link_mode: String,
+    pub crt_features: Vec<String>,
+    pub run_tests: String,
+    pub build_info: PythonBuildInfo,
+    pub licenses: Option<Vec<String>>,
+    pub license_path: Option<String>,
+    pub tcl_library_path: Option<String>,
+    pub tcl_library_paths: Option<Vec<String>>,
+}
+
+pub fn parse_python_json(json_data: &[u8]) -> Result<PythonJsonMain> {
+    let v: PythonJsonMain = serde_json::from_slice(&json_data)?;
+
+    Ok(v)
+}