[CI] Script to help know if localized pages need updating (#4599)

scripts/i18n-check.sh

@@ -0,0 +1,103 @@
+#!/bin/bash
+#
+# Inspired by https://github.com/kubernetes/website/blob/main/scripts/lsync.sh
+
+EXTRA_DIFF_ARGS="--numstat"
+TARGET_PATHS=""
+
+function _usage() {
+  cat <<EOS
+Usage: $(basename "$0") [options] TARGET_PATH ...
+
+  For each localized page target, this script reports whether the English
+  language version of that page has changed since the localized file was
+  first written or last edited.
+
+  TARGET_PATH can be a single markdown file of a localized page, such as
+  'content/ja/_index.md', or a directory of localized pages, such as 'content/ja'.
+
+  -h  Output this usage info.
+  -d  Output diff details.
+  -v  Verbose mode.
+EOS
+}
+
+function usage() {
+  local status=${1:-0}
+  _usage 1>&2
+  exit $status
+}
+
+function process_CLI_args() {
+  while getopts ":hdv" opt; do
+    case $opt in
+      h)
+        usage
+        ;;
+      d)
+        EXTRA_DIFF_ARGS=""
+        ;;
+      v)
+        VERBOSE=1
+        ;;
+      \?)
+        echo "ERROR: unrecognized flag: -$OPTARG"
+        usage 1
+        ;;
+    esac
+  done
+
+  shift $((OPTIND-1))
+  if [ "$#" -lt 1 ]; then
+    echo "ERROR: target path argument is missing" >&2
+    usage 1
+  fi
+
+  TARGET_PATHS="$@"
+
+  if [[ -f "TARGET_PATHS" && ! -e "$TARGET_PATHS" ]] ; then
+    echo "Path not found: '$TARGET_PATHS'" >&2
+    exit 2
+  fi
+}
+
+function main() {
+  process_CLI_args "$@"
+
+  if [ -f "$TARGET_PATHS" ] ; then
+    TARGETS="$TARGET_PATHS"
+  else
+    TARGETS=$(find $TARGET_PATHS -name "*.md")
+    if [[ -z "$TARGETS" ]]; then
+      echo "ERROR: target directory contains no markdown files: '$TARGET_PATHS'" >&2
+      exit 1
+    fi
+    # if [[ -n $VERBOSE ]]; then echo -e "All targets: $TARGETS"; fi
+  fi
+
+  SYNCED=1
+  for f in $TARGETS; do
+    # if [[ -n $VERBOSE ]]; then echo -e "Checking\t$f"; fi
+    EN_VERSION=$(echo "$f" | sed "s/content\/.\{2,5\}\//content\/en\//g")
+    if [[ ! -e "$EN_VERSION" ]]; then
+      echo "Base file renamed or removed: $EN_VERSION"
+      SYNCED=0
+      continue
+    fi
+
+    LASTCOMMIT=$(git log -n 1 --pretty=format:%h -- "$f")
+    git diff --exit-code $EXTRA_DIFF_ARGS $LASTCOMMIT...HEAD "$EN_VERSION"
+    if [ $? -ne 0 ] ; then
+      SYNCED=0
+    elif [[ -n $VERBOSE ]]; then
+      echo -e "File is in sync\t$f"
+    fi
+  done
+  if [ $SYNCED -ne 1 ]; then
+    exit 1
+  fi
+
+  echo "$TARGET_PATHS is still in sync"
+}
+
+main "$@"