diff --git a/src/ci/docker/run.sh b/src/ci/docker/run.sh
index fad4b5af0953f..bfd078f5fa5d2 100755
--- a/src/ci/docker/run.sh
+++ b/src/ci/docker/run.sh
@@ -50,6 +50,22 @@ if [ -d "$root_dir/.git" ]; then
     IS_GIT_SOURCE=1
 fi
 
+if [ $IS_GIT_SOURCE -eq 1 ]; then
+    git_repository=$(parse_stage0_file_by_key "git_repository")
+    nightly_branch=$(parse_stage0_file_by_key "nightly_branch")
+
+    # Add remote only if it doesn't exist
+    if ! git remote | grep -q "^${git_repository}$"; then
+        echo "Configuring remote upstream."
+        git remote add upstream "https://github.com/${git_repository}"
+        REMOTE_NAME="upstream"
+    else
+        REMOTE_NAME="origin"
+    fi
+
+    git fetch $REMOTE_NAME $nightly_branch
+fi
+
 CACHE_DOMAIN="${CACHE_DOMAIN:-ci-caches.rust-lang.org}"
 
 if [ -f "$docker_dir/$image/Dockerfile" ]; then
diff --git a/src/ci/shared.sh b/src/ci/shared.sh
index 2b0a10e4d08d9..bd87fa52f2baf 100644
--- a/src/ci/shared.sh
+++ b/src/ci/shared.sh
@@ -136,3 +136,15 @@ 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"
+}