백업 레포 내용이 동일하면 Skip

.gitea/workflows/mirror.yml

@@ -52,6 +52,11 @@ jobs:
               start)
                 text="센터Git ${repo} 백업을 ${ts}에 시작합니다. (branch: ${branch}, mode: ${mode})"
                 ;;
+              skip)
+                end_epoch=$(date +%s)
+                duration=$((end_epoch - start_epoch))
+                text="센터Git ${repo} 백업을 건너뜁니다. (branch: ${branch} -> main, mode: ${mode}, duration: ${duration}s, 시각: ${ts})"
+                ;;
               success)
                 end_epoch=$(date +%s)
                 duration=$((end_epoch - start_epoch))
@@ -142,6 +147,7 @@ jobs:
               notify_status "error" "${repo_name}" "${branch_name}" "${backup_mode}" "${start_epoch}" "source branch 없음/비어 있음"
               return
             fi
+            branch_commit=$(echo "${branch_ref}" | awk '{print $1}')
 
             # Check if repository exists on Gitea
             repo_exists=false
@@ -180,6 +186,17 @@ jobs:
             GITEA_HOSTNAME=$(echo "${BASE_GITEA_URL}" | sed -e 's~^https*://~~' -e 's~/$~~')
             GITEA_REMOTE="https://${BASE_GITEA_USER}:${BASE_GITEA_TOKEN}@${GITEA_HOSTNAME}/${CENTER_ORG}/${repo_name}.git"
             
+            # If target repo exists and refs match, skip heavy operations
+            if ${repo_exists}; then
+              target_main_ref=$(git ls-remote "${GITEA_REMOTE}" "refs/heads/main" || true)
+              target_commit=$(echo "${target_main_ref}" | awk '{print $1}')
+              if [[ -n "${branch_commit:-}" && -n "${target_commit}" && "${branch_commit}" == "${target_commit}" ]]; then
+                echo "Target main already at source commit (${branch_commit}). Skipping clone/push."
+                notify_status "skip" "${repo_name}" "${branch_name}" "${backup_mode}" "${start_epoch}"
+                return
+              fi
+            fi
+
             # Create a temporary directory for cloning
             CLONE_DIR=$(mktemp -d)
             echo "Working directory: ${CLONE_DIR}"