build: add monorepo issue migration script

monorepo-migration/migrate_issues.sh

@@ -0,0 +1,97 @@
+#!/bin/bash
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# migrate_issues.sh - Transfer open GitHub issues from one repo to another using gh CLI.
+
+set -e
+
+usage() {
+  echo "Usage: $0 <source-repo> <target-repo> [--dry-run]"
+  echo "Example: $0 googleapis/python-storage googleapis/google-cloud-python"
+  exit 1
+}
+
+SOURCE_REPO=$1
+TARGET_REPO=$2
+DRY_RUN=false
+
+if [[ "$3" == "--dry-run" ]]; then
+  DRY_RUN=true
+fi
+
+if [[ -z "$SOURCE_REPO" || -z "$TARGET_REPO" ]]; then
+  usage
+fi
+
+# Check if gh is installed
+if ! command -v gh &> /dev/null; then
+  echo "Error: gh (GitHub CLI) is not installed."
+  exit 1
+fi
+
+# Check if authenticated
+if ! gh auth status &> /dev/null; then
+  echo "Error: gh is not authenticated. Run 'gh auth login' first."
+  exit 1
+fi
+
+echo "Transferring open issues from $SOURCE_REPO to $TARGET_REPO..."
+if [ "$DRY_RUN" = true ]; then
+  echo "--- DRY RUN MODE ---"
+fi
+
+# Fetch all open issues from source repo
+# We use --limit 1000 to get a reasonable amount of issues. Adjust if needed.
+ISSUE_NUMBERS=$(gh issue list --repo "$SOURCE_REPO" --state open --limit 1000 --json number --jq '.[].number')
+
+if [[ -z "$ISSUE_NUMBERS" ]]; then
+  echo "No open issues found in $SOURCE_REPO."
+  exit 0
+fi
+
+# Extract short name from SOURCE_REPO (e.g., java-bigquery from googleapis/java-bigquery)
+REPO_SHORT_NAME=$(echo "$SOURCE_REPO" | cut -d'/' -f2)
+
+# Process each issue
+for ISSUE_NUMBER in $ISSUE_NUMBERS; do
+  echo "Processing Issue #$ISSUE_NUMBER..."
+
+  # Get the current title
+  TITLE=$(gh issue view "$ISSUE_NUMBER" --repo "$SOURCE_REPO" --json title --jq '.title')
+  NEW_TITLE="[$REPO_SHORT_NAME] $TITLE"
+
+  if [ "$DRY_RUN" = true ]; then
+    echo "  [DRY RUN] Would transfer #$ISSUE_NUMBER to $TARGET_REPO"
+    echo "  [DRY RUN] Would update title to: $NEW_TITLE"
+  else
+    echo "  Transferring #$ISSUE_NUMBER..."
+    # Capture the output of transfer to get the new issue URL
+    TRANSFER_OUTPUT=$(gh issue transfer "$ISSUE_NUMBER" "$TARGET_REPO" --repo "$SOURCE_REPO")
+
+    # The output is typically something like: https://github.com/googleapis/google-cloud-java/issues/1234
+    NEW_ISSUE_URL=$(echo "$TRANSFER_OUTPUT" | grep -o 'https://github.com/[^ ]*')
+    NEW_ISSUE_NUMBER=$(echo "$NEW_ISSUE_URL" | awk -F'/' '{print $NF}')
+
+    if [[ -n "$NEW_ISSUE_NUMBER" ]]; then
+      echo "  Transferred to $TARGET_REPO as #$NEW_ISSUE_NUMBER. Updating title..."
+      gh issue edit "$NEW_ISSUE_NUMBER" --repo "$TARGET_REPO" --title "$NEW_TITLE"
+      echo "  Title updated."
+    else
+      echo "  Warning: Could not determine new issue number from output: $TRANSFER_OUTPUT"
+    fi
+  fi
+done
+
+echo "Transfer completed."