use shared stage0 parser from build_helper

Signed-off-by: onur-ozkan <work@onurozkan.dev>

Author: onur-ozkan

Cargo.lock

@@ -380,10 +380,10 @@ name = "bump-stage0"
 version = "0.1.0"
 dependencies = [
  "anyhow",
+ "build_helper",
  "curl",
  "indexmap",
  "serde",
- "serde_json",
  "toml 0.5.11",
 ]
 

src/bootstrap/src/core/config/config.rs

@@ -181,7 +181,7 @@ pub struct Config {
     pub test_compare_mode: bool,
     pub color: Color,
     pub patch_binaries_for_nix: Option<bool>,
-    pub stage0_metadata: Stage0Metadata,
+    pub stage0_metadata: build_helper::stage0_parser::Stage0,
     pub android_ndk: Option<PathBuf>,
     /// Whether to use the `c` feature of the `compiler_builtins` crate.
     pub optimized_compiler_builtins: bool,
@@ -350,34 +350,6 @@ pub struct Config {
     pub paths: Vec<PathBuf>,
 }
 
-#[derive(Default, Deserialize, Clone)]
-pub struct Stage0Metadata {
-    pub compiler: CompilerMetadata,
-    pub config: Stage0Config,
-    pub checksums_sha256: HashMap<String, String>,
-    pub rustfmt: Option<RustfmtMetadata>,
-}
-#[derive(Default, Deserialize, Clone)]
-pub struct CompilerMetadata {
-    pub date: String,
-    pub version: String,
-}
-
-#[derive(Default, Deserialize, Clone)]
-pub struct Stage0Config {
-    pub dist_server: String,
-    pub artifacts_server: String,
-    pub artifacts_with_llvm_assertions_server: String,
-    pub git_merge_commit_email: String,
-    pub git_repository: String,
-    pub nightly_branch: String,
-}
-#[derive(Default, Deserialize, Clone)]
-pub struct RustfmtMetadata {
-    pub date: String,
-    pub version: String,
-}
-
 #[derive(Clone, Debug, Default)]
 pub enum RustfmtState {
     SystemToolchain(PathBuf),
@@ -1296,13 +1268,13 @@ impl Config {
                 Some(p) => PathBuf::from(p),
                 None => git_root,
             };
-            // If this doesn't have at least `stage0.json`, we guessed wrong. This can happen when,
+            // If this doesn't have at least `stage0`, we guessed wrong. This can happen when,
             // for example, the build directory is inside of another unrelated git directory.
             // In that case keep the original `CARGO_MANIFEST_DIR` handling.
             //
             // NOTE: this implies that downloadable bootstrap isn't supported when the build directory is outside
             // the source directory. We could fix that by setting a variable from all three of python, ./x, and x.ps1.
-            if git_root.join("src").join("stage0.json").exists() {
+            if git_root.join("src").join("stage0").exists() {
                 config.src = git_root;
             }
         } else {
@@ -1320,9 +1292,7 @@ impl Config {
             .to_path_buf();
         }
 
-        let stage0_json = t!(std::fs::read(config.src.join("src").join("stage0.json")));
-
-        config.stage0_metadata = t!(serde_json::from_slice::<Stage0Metadata>(&stage0_json));
+        config.stage0_metadata = build_helper::stage0_parser::parse_stage0_file();
 
         // Read from `--config`, then `RUST_BOOTSTRAP_CONFIG`, then `./config.toml`, then `config.toml` in the root directory.
         let toml_path = flags

src/bootstrap/src/core/download.rs

@@ -9,9 +9,9 @@ use std::{
 };
 
 use build_helper::ci::CiEnv;
+use build_helper::stage0_parser::VersionMetadata;
 use xz2::bufread::XzDecoder;
 
-use crate::core::config::RustfmtMetadata;
 use crate::utils::helpers::{check_run, exe, program_out_of_date};
 use crate::{core::build_steps::llvm::detect_llvm_sha, utils::helpers::hex_encode};
 use crate::{t, Config};
@@ -408,7 +408,7 @@ impl Config {
     /// NOTE: rustfmt is a completely different toolchain than the bootstrap compiler, so it can't
     /// reuse target directories or artifacts
     pub(crate) fn maybe_download_rustfmt(&self) -> Option<PathBuf> {
-        let RustfmtMetadata { date, version } = self.stage0_metadata.rustfmt.as_ref()?;
+        let VersionMetadata { date, version } = self.stage0_metadata.rustfmt.as_ref()?;
         let channel = format!("{version}-{date}");
 
         let host = self.build;
@@ -606,7 +606,7 @@ impl Config {
             DownloadSource::Dist => {
                 let dist_server = env::var("RUSTUP_DIST_SERVER")
                     .unwrap_or(self.stage0_metadata.config.dist_server.to_string());
-                // NOTE: make `dist` part of the URL because that's how it's stored in src/stage0.json
+                // NOTE: make `dist` part of the URL because that's how it's stored in src/stage0
                 (dist_server, format!("dist/{key}/{filename}"), true)
             }
         };
@@ -616,7 +616,7 @@ impl Config {
         // this on each and every nightly ...
         let checksum = if should_verify {
             let error = format!(
-                "src/stage0.json doesn't contain a checksum for {url}. \
+                "src/stage0 doesn't contain a checksum for {url}. \
                 Pre-built artifacts might not be available for this \
                 target at this time, see https://doc.rust-lang.org/nightly\
                 /rustc/platform-support.html for more information."

src/tools/build_helper/src/lib.rs

@@ -2,3 +2,4 @@ pub mod ci;
 pub mod git;
 pub mod metrics;
 pub mod util;
+pub mod stage0_parser;

src/tools/build_helper/src/stage0_parser.rs

@@ -0,0 +1,76 @@
+use std::collections::BTreeMap;
+
+#[derive(Default, Clone)]
+pub struct Stage0 {
+    pub compiler: VersionMetadata,
+    pub rustfmt: Option<VersionMetadata>,
+    pub config: Stage0Config,
+    pub checksums_sha256: BTreeMap<String, String>,
+}
+
+#[derive(Default, Clone)]
+pub struct VersionMetadata {
+    pub date: String,
+    pub version: String,
+}
+
+#[derive(Default, Clone)]
+pub struct Stage0Config {
+    pub dist_server: String,
+    pub artifacts_server: String,
+    pub artifacts_with_llvm_assertions_server: String,
+    pub git_merge_commit_email: String,
+    pub git_repository: String,
+    pub nightly_branch: String,
+}
+
+pub fn parse_stage0_file() -> Stage0 {
+    let stage0_content = include_str!("../../../stage0");
+
+    let mut stage0 = Stage0::default();
+    for line in stage0_content.lines() {
+        let line = line.trim();
+
+        if line.is_empty() {
+            continue;
+        }
+
+        // Ignore comments
+        if line.starts_with('#') {
+            continue;
+        }
+
+        let (key, value) = line.split_once('=').unwrap();
+
+        match key {
+            "dist_server" => stage0.config.dist_server = value.to_owned(),
+            "artifacts_server" => stage0.config.artifacts_server = value.to_owned(),
+            "artifacts_with_llvm_assertions_server" => {
+                stage0.config.artifacts_with_llvm_assertions_server = value.to_owned()
+            }
+            "git_merge_commit_email" => stage0.config.git_merge_commit_email = value.to_owned(),
+            "git_repository" => stage0.config.git_repository = value.to_owned(),
+            "nightly_branch" => stage0.config.nightly_branch = value.to_owned(),
+
+            "compiler_date" => stage0.compiler.date = value.to_owned(),
+            "compiler_version" => stage0.compiler.version = value.to_owned(),
+
+            "rustfmt_date" => {
+                stage0.rustfmt.get_or_insert(VersionMetadata::default()).date = value.to_owned();
+            }
+            "rustfmt_version" => {
+                stage0.rustfmt.get_or_insert(VersionMetadata::default()).version = value.to_owned();
+            }
+
+            dist if dist.starts_with("dist") => {
+                stage0.checksums_sha256.insert(key.to_owned(), value.to_owned());
+            }
+
+            unsupported => {
+                println!("'{unsupported}' field is not supported.");
+            }
+        }
+    }
+
+    stage0
+}

src/tools/bump-stage0/Cargo.toml

@@ -7,8 +7,8 @@ edition = "2021"
 
 [dependencies]
 anyhow = "1.0.34"
+build_helper = { path = "../build_helper" }
 curl = "0.4.38"
 indexmap = { version = "2.0.0", features = ["serde"] }
 serde = { version = "1.0.125", features = ["derive"] }
-serde_json = { version = "1.0.59", features = ["preserve_order"] }
 toml = "0.5.7"