증분백업 로직 개선, shallow_exclude 옵션 활용.

.gitea/workflows/mirror.yml

@@ -13,7 +13,7 @@ on:
 jobs:
   mirror:
     runs-on: [internal]
-    timeout-minutes: 360 # 6 hours timeout
+    timeout-minutes: 500
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -216,6 +216,10 @@ jobs:
                 return
               fi
             fi
+            shallow_exclude_args=()
+            if ${repo_exists} && [[ -n "${target_commit:-}" ]]; then
+              shallow_exclude_args=(--shallow-exclude="${target_commit}")
+            fi
 
             # Create a temporary directory for cloning
             CLONE_DIR=$(mktemp -d)
@@ -242,14 +246,10 @@ jobs:
               fi
               git remote add origin "${GITEA_REMOTE}"
               git remote add source "${source_repo_url}"
-              echo "Seeding objects from target main for delta fetch..."
-              if ! git fetch --no-tags origin "+refs/heads/main:refs/heads/main"; then
-                echo "::warning::Failed to fetch target main; continuing without seed"
-              fi
             fi
 
             echo "Fetching latest branch '${branch_name}' from source..."
-            if ! git fetch --no-tags source "+refs/heads/${branch_name}:refs/heads/${branch_name}"; then
+            if ! git fetch --no-tags "${shallow_exclude_args[@]}" source "+refs/heads/${branch_name}:refs/heads/${branch_name}"; then
               echo "::error::Failed to fetch branch '${branch_name}' from source repo"
               notify_status "error" "${repo_name}" "${branch_name}" "${backup_mode}" "${start_epoch}" "source fetch 오류"
               cd "${ROOT_DIR}"