[Misc] fetch dependence from gitcode as backup

ucm/shared/vendor/CMakeLists.txt

@@ -1,13 +1,55 @@
-function(EnableDept name url tag)
-    if(DOWNLOAD_DEPENDENCE)
-        FetchContent_Declare(${name} GIT_REPOSITORY ${url} GIT_TAG ${tag} GIT_SHALLOW TRUE)
-        FetchContent_MakeAvailable(${name})
-    else()
-        add_subdirectory(${name})
+function(EnableDept)
+    cmake_parse_arguments(DEPT "" "NAME;TAG" "GIT_URLS" ${ARGN})
+    find_program(GIT_EXECUTABLE git)
+    if(NOT GIT_EXECUTABLE)
+        message(FATAL_ERROR "git not found!")
     endif()
+    foreach(GIT_URL IN LISTS DEPT_GIT_URLS)
+        execute_process(
+            COMMAND ${GIT_EXECUTABLE} ls-remote --heads "${GIT_URL}"
+            RESULT_VARIABLE GIT_RESULT
+            OUTPUT_QUIET
+            ERROR_QUIET
+            TIMEOUT 15
+        )
+        if(GIT_RESULT EQUAL 0)
+            set(VALID_GIT_URL ${GIT_URL})
+            break()
+        endif()
+    endforeach()
+    if(NOT VALID_GIT_URL)
+        message(FATAL_ERROR "all urls for ${DEPT_NAME} are not reachable!")
+    endif()
+    message(STATUS "Fetching ${DEPT_NAME}(${DEPT_TAG}) from ${VALID_GIT_URL}")
+    FetchContent_Declare(${DEPT_NAME} GIT_REPOSITORY ${VALID_GIT_URL} GIT_TAG ${DEPT_TAG} GIT_SHALLOW TRUE)
+    FetchContent_MakeAvailable(${DEPT_NAME})
 endfunction()
 
-include(FetchContent)
-EnableDept(fmt https://github.com/fmtlib/fmt.git 11.2.0)
-EnableDept(spdlog https://github.com/gabime/spdlog.git v1.15.3)
-EnableDept(pybind11 https://github.com/pybind/pybind11.git v3.0.1)
+if(DOWNLOAD_DEPENDENCE)
+    include(FetchContent)
+    EnableDept(
+        NAME fmt
+        TAG 11.2.0
+        GIT_URLS
+            https://github.com/fmtlib/fmt.git
+            https://gitcode.com/GitHub_Trending/fm/fmt.git
+    )
+    EnableDept(
+        NAME spdlog
+        TAG v1.15.3
+        GIT_URLS
+            https://github.com/gabime/spdlog.git
+            https://gitcode.com/GitHub_Trending/sp/spdlog.git
+    )
+    EnableDept(
+        NAME pybind11
+        TAG v3.0.1
+        GIT_URLS
+            https://github.com/pybind/pybind11.git
+            https://gitcode.com/GitHub_Trending/py/pybind11.git
+    )
+else()
+    add_subdirectory(fmt)
+    add_subdirectory(spdlog)
+    add_subdirectory(pybind11)
+endif()