From 2de3cf8d6b20d8611a21e8e90685714e80c8ce68 Mon Sep 17 00:00:00 2001
From: onur-ozkan <work@onurozkan.dev>
Date: Tue, 5 Dec 2023 18:25:27 +0300
Subject: [PATCH] sort dump files at the end of bootstrap

To ensure deterministic results we must sort the dump lines.
This is necessary because the order of rustc invocations different
almost all the time.

Signed-off-by: onur-ozkan <work@onurozkan.dev>
---
 src/bootstrap/src/bin/main.rs | 31 +++++++++++++++++++++++++++++--
 1 file changed, 29 insertions(+), 2 deletions(-)

diff --git a/src/bootstrap/src/bin/main.rs b/src/bootstrap/src/bin/main.rs
index b3c427721ea3b..32f6a3f80d064 100644
--- a/src/bootstrap/src/bin/main.rs
+++ b/src/bootstrap/src/bin/main.rs
@@ -10,8 +10,9 @@ use std::io::Write;
 #[cfg(all(any(unix, windows), not(target_os = "solaris")))]
 use std::process;
 use std::{
-    env, fs,
-    io::{self, IsTerminal},
+    env,
+    fs::{self, OpenOptions},
+    io::{self, BufRead, BufReader, IsTerminal},
 };
 
 use bootstrap::{
@@ -79,6 +80,9 @@ fn main() {
     }
 
     let pre_commit = config.src.join(".git").join("hooks").join("pre-commit");
+    let dump_bootstrap_shims = config.dump_bootstrap_shims;
+    let out_dir = config.out.clone();
+
     Build::new(config).build();
 
     if suggest_setup {
@@ -107,6 +111,29 @@ fn main() {
     if suggest_setup || changelog_suggestion.is_some() {
         println!("NOTE: this message was printed twice to make it more likely to be seen");
     }
+
+    if dump_bootstrap_shims {
+        let dump_dir = out_dir.join("bootstrap-shims-dump");
+        assert!(dump_dir.exists());
+
+        for entry in walkdir::WalkDir::new(&dump_dir) {
+            let entry = t!(entry);
+
+            if !entry.file_type().is_file() {
+                continue;
+            }
+
+            let file = t!(fs::File::open(&entry.path()));
+
+            // To ensure deterministic results we must sort the dump lines.
+            // This is necessary because the order of rustc invocations different
+            // almost all the time.
+            let mut lines: Vec<String> = t!(BufReader::new(&file).lines().collect());
+            lines.sort_by_key(|t| t.to_lowercase());
+            let mut file = t!(OpenOptions::new().write(true).truncate(true).open(&entry.path()));
+            t!(file.write_all(lines.join("\n").as_bytes()));
+        }
+    }
 }
 
 fn check_version(config: &Config) -> Option<String> {