use stage0 file in bootstrap.py

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

src/bootstrap/bootstrap.py

@@ -52,7 +52,7 @@ def get(base, url, path, checksums, verbose=False):
 
     try:
         if url not in checksums:
-            raise RuntimeError(("src/stage0.json doesn't contain a checksum for {}. "
+            raise RuntimeError(("src/stage0 doesn't contain a checksum for {}. "
                                 "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.")
@@ -421,9 +421,9 @@ def output(filepath):
 
 
 class Stage0Toolchain:
-    def __init__(self, stage0_payload):
-        self.date = stage0_payload["date"]
-        self.version = stage0_payload["version"]
+    def __init__(self, date, version):
+        self.date = date
+        self.version = version
 
     def channel(self):
         return self.version + "-" + self.date
@@ -439,7 +439,7 @@ def __init__(
         bin_root,
         tarball_path,
         tarball_suffix,
-        checksums_sha256,
+        stage0_data,
         pattern,
         verbose,
     ):
@@ -448,7 +448,7 @@ def __init__(
         self.bin_root = bin_root
         self.tarball_path = tarball_path
         self.tarball_suffix = tarball_suffix
-        self.checksums_sha256 = checksums_sha256
+        self.stage0_data = stage0_data
         self.pattern = pattern
         self.verbose = verbose
 
@@ -458,7 +458,7 @@ def download_component(download_info):
             download_info.base_download_url,
             download_info.download_path,
             download_info.tarball_path,
-            download_info.checksums_sha256,
+            download_info.stage0_data,
             verbose=download_info.verbose,
         )
 
@@ -510,11 +510,9 @@ def __init__(self, config_toml="", args=None):
         build_dir = args.build_dir or self.get_toml('build-dir', 'build') or 'build'
         self.build_dir = os.path.abspath(build_dir)
 
-        with open(os.path.join(self.rust_root, "src", "stage0.json")) as f:
-            data = json.load(f)
-        self.checksums_sha256 = data["checksums_sha256"]
-        self.stage0_compiler = Stage0Toolchain(data["compiler"])
-        self.download_url = os.getenv("RUSTUP_DIST_SERVER") or data["config"]["dist_server"]
+        self.stage0_data = parse_stage0_file(os.path.join(self.rust_root, "src", "stage0"))
+        self.stage0_compiler = Stage0Toolchain(self.stage0_data["compiler_date"], self.stage0_data["compiler_version"])
+        self.download_url = os.getenv("RUSTUP_DIST_SERVER") or self.stage0_data["dist_server"]
 
         self.build = args.build or self.build_triple()
 
@@ -581,7 +579,7 @@ def download_toolchain(self):
                     bin_root=self.bin_root(),
                     tarball_path=os.path.join(rustc_cache, filename),
                     tarball_suffix=tarball_suffix,
-                    checksums_sha256=self.checksums_sha256,
+                    stage0_data=self.stage0_data,
                     pattern=pattern,
                     verbose=self.verbose,
                 )
@@ -1071,6 +1069,16 @@ def parse_args(args):
 
     return parser.parse_known_args(args)[0]
 
+def parse_stage0_file(path):
+    result = {}
+    with open(path, 'r') as file:
+        for line in file:
+            line = line.strip()
+            if line and not line.startswith('#'):
+                key, value = line.split('=', 1)
+                result[key.strip()] = value.strip()
+    return result
+
 def bootstrap(args):
     """Configure, fetch, build and run the initial bootstrap"""
     rust_root = os.path.abspath(os.path.join(__file__, '../../..'))