Revert "add new CI step: "setup upstream remote""

This reverts commit 4454fa998c.

.github/workflows/ci.yml

@@ -130,9 +130,6 @@ 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/scripts/setup-upstream-remote.sh

@@ -1,24 +0,0 @@
-#!/bin/bash
-# In CI environments, bootstrap is forced to use the remote upstream based
-# on "git_repository" and "nightly_branch" values from src/stage0 file.
-# This script configures the remote as it may not exist by default.
-
-set -euo pipefail
-IFS=$'\n\t'
-
-ci_dir=$(cd $(dirname $0) && pwd)/..
-source "$ci_dir/shared.sh"
-
-git_repository=$(parse_stage0_file_by_key "git_repository")
-nightly_branch=$(parse_stage0_file_by_key "nightly_branch")
-
-# Configure "rust-lang/rust" upstream remote only when it's not origin.
-if [ -z "$(git config remote.origin.url | grep $git_repository)" ]; then
-    echo "Configuring https://github.com/$git_repository remote as upstream."
-    git remote add upstream "https://github.com/$git_repository"
-    REMOTE_NAME="upstream"
-else
-    REMOTE_NAME="origin"
-fi
-
-git fetch $REMOTE_NAME $nightly_branch

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"
-}