Auto merge of #133445 - BoxyUwU:stable, r=BoxyUwU

[stable] Prepare Rust 1.83.0

r? `@ghost`

.github/workflows/ci.yml

@@ -122,9 +122,6 @@ jobs:
           # which then uses log commands to actually set them.
           EXTRA_VARIABLES: ${{ toJson(matrix.env) }}
 
-      - name: setup upstream remote
-        run: src/ci/scripts/setup-upstream-remote.sh
-
       - name: ensure the channel matches the target branch
         run: src/ci/scripts/verify-channel.sh
 

src/ci/channel

@@ -1 +1 @@
-beta
+stable

src/ci/shared.sh

@@ -136,15 +136,3 @@ function releaseChannel {
         echo $RUST_CI_OVERRIDE_RELEASE_CHANNEL
     fi
 }
-
-# Parse values from src/stage0 file by key
-function parse_stage0_file_by_key {
-    local key="$1"
-    local file="$ci_dir/../stage0"
-    local value=$(awk -F= '{a[$1]=$2} END {print(a["'$key'"])}' $file)
-    if [ -z "$value" ]; then
-        echo "ERROR: Key '$key' not found in '$file'."
-        exit 1
-    fi
-    echo "$value"
-}

src/tools/build_helper/src/git.rs

@@ -1,8 +1,6 @@
 use std::path::{Path, PathBuf};
 use std::process::{Command, Stdio};
 
-use crate::ci::CiEnv;
-
 pub struct GitConfig<'a> {
     pub git_repository: &'a str,
     pub nightly_branch: &'a str,
@@ -116,8 +114,8 @@ fn git_upstream_merge_base(
 
 /// Searches for the nearest merge commit in the repository that also exists upstream.
 ///
-/// It looks for the most recent commit made by the merge bot by matching the author's email
-/// address with the merge bot's email.
+/// If it fails to find the upstream remote, it then looks for the most recent commit made
+/// by the merge bot by matching the author's email address with the merge bot's email.
 pub fn get_closest_merge_commit(
     git_dir: Option<&Path>,
     config: &GitConfig<'_>,
@@ -129,15 +127,7 @@ pub fn get_closest_merge_commit(
         git.current_dir(git_dir);
     }
 
-    let merge_base = {
-        if CiEnv::is_ci() {
-            git_upstream_merge_base(config, git_dir).unwrap()
-        } else {
-            // For non-CI environments, ignore rust-lang/rust upstream as it usually gets
-            // outdated very quickly.
-            "HEAD".to_string()
-        }
-    };
+    let merge_base = git_upstream_merge_base(config, git_dir).unwrap_or_else(|_| "HEAD".into());
 
     git.args([
         "rev-list",