replace commit placeholder in vendor status with actual commit

Author: Shourya742

src/bootstrap/bootstrap.py

@@ -1162,6 +1162,37 @@ def build_triple(self):
         config = self.get_toml("build")
         return config or default_build_triple(self.verbose)
 
+    def is_git_repository(self, repo_path):
+        return subprocess.run(
+            ["git", "-C", repo_path, "rev-parse", "--is-inside-work-tree"],
+            stdout=subprocess.DEVNULL,
+            stderr=subprocess.DEVNULL,
+        ).returncode == 0
+
+    def get_latest_commit(self, repo_path, branch, author_email):
+        try:
+            if not self.is_git_repository(repo_path):
+                return "<commit>"
+            cmd = [
+                "git", "-C", repo_path, "log", "--format=%H",
+                "--author", author_email, branch, "-n", "1"
+            ]
+            commit = subprocess.check_output(cmd, text=True).strip()
+            return commit if commit else "<commit>"
+        except subprocess.CalledProcessError:
+            return "<commit>"
+
+    def get_values(self):
+        file_path = "src/stage0"
+        keys = ["git_merge_commit_email", "nightly_branch"]
+        values = []
+        with open(file_path, "r") as file:
+            for line in file:
+                for key in keys:
+                    if line.startswith(f"{key}="):
+                        values.append(line.split("=", 1)[1].strip())
+        return values
+        
     def check_vendored_status(self):
         """Check that vendoring is configured properly"""
         # keep this consistent with the equivalent check in bootstrap:
@@ -1174,7 +1205,11 @@ def check_vendored_status(self):
                 eprint("      use vendored sources by default.")
 
         cargo_dir = os.path.join(self.rust_root, ".cargo")
-        url = "https://ci-artifacts.rust-lang.org/rustc-builds/<commit>/rustc-nightly-src.tar.xz"
+        repo_path=self.rust_root
+        git_merge_commit_email, nightly_branch = self.get_values()
+        commit = self.get_latest_commit(repo_path, nightly_branch, git_merge_commit_email)
+        url = f"https://ci-artifacts.rust-lang.org/rustc-builds/{commit}/rustc-nightly-src.tar.xz"
+
         if self.use_vendored_sources:
             vendor_dir = os.path.join(self.rust_root, "vendor")
             if not os.path.exists(vendor_dir):