ci: lint only new changes (#23710)

scripts/go-lint-all.bash

@@ -10,7 +10,7 @@ lint_module() {
   shift
   cd "$(dirname "$root")" &&
     echo "linting $(grep "^module" go.mod) [$(date -Iseconds -u)]" &&
-    golangci-lint run ./... -c "${REPO_ROOT}/.golangci.yml" "$@"
+    golangci-lint run ./... -c "${REPO_ROOT}/.golangci.yml" "$@" --new-from-rev=HEAD~
 }
 export -f lint_module
 
@@ -31,7 +31,7 @@ else
   for f in $(dirname $(echo "$GIT_DIFF" | tr -d "'") | uniq); do
     echo "linting $f [$(date -Iseconds -u)]" &&
     cd $f &&
-    golangci-lint run ./... -c "${REPO_ROOT}/.golangci.yml" "$@" &&
+    golangci-lint run ./... -c "${REPO_ROOT}/.golangci.yml" "$@" --new-from-rev=HEAD~ &&
     cd $REPO_ROOT
   done
 fi

scripts/go-lint-changes.bash

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+
+set -e -o pipefail
+
+REPO_ROOT="$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )/.." &> /dev/null && pwd )"
+export REPO_ROOT
+
+lint_module() {
+  local root="$1"
+  shift
+  cd "$(dirname "$root")" &&
+    echo "linting $(grep "^module" go.mod) [$(date -Iseconds -u)]" &&
+    golangci-lint run ./... -c "${REPO_ROOT}/.golangci.yml" "$@" --new-from-rev=HEAD~
+}
+export -f lint_module
+
+# if LINT_DIFF env is set, only lint the files in the current commit otherwise lint all files
+if [[ -z "${LINT_DIFF:-}" ]]; then
+  find "${REPO_ROOT}" -type f -name go.mod -print0 |
+    xargs -0 -I{} bash -c 'lint_module "$@"' _ {} "$@"
+else
+  if [[ -z $GIT_DIFF ]]; then
+    GIT_DIFF=$(git diff --name-only --diff-filter=d | grep \.go$ | grep -v \.pb\.go$) || true
+  fi
+
+  if [[ -z "$GIT_DIFF" ]]; then
+    echo "no files to lint"
+    exit 0
+  fi
+
+  for f in $(dirname $(echo "$GIT_DIFF" | tr -d "'") | uniq); do
+    echo "linting $f [$(date -Iseconds -u)]" &&
+    cd $f &&
+    golangci-lint run ./... -c "${REPO_ROOT}/.golangci.yml" "$@" --new-from-rev=HEAD~ &&
+    cd $REPO_ROOT
+  done
+fi