🦈 IMP: Better CMake CPM Installation Logging

Bench: 7489006

CMakeLists.txt

@@ -12,19 +12,43 @@ set(CPM_DOWNLOAD_VERSION 0.38.0)
 
 if(CPM_SOURCE_CACHE)
     set(CPM_DOWNLOAD_LOCATION "${CPM_SOURCE_CACHE}/cpm/CPM_${CPM_DOWNLOAD_VERSION}.cmake")
+    message(STATUS "Setting CPM.cmake location to ${CPM_DOWNLOAD_LOCATION}")
 elseif(DEFINED ENV{CPM_SOURCE_CACHE})
     set(CPM_DOWNLOAD_LOCATION "$ENV{CPM_SOURCE_CACHE}/cpm/CPM_${CPM_DOWNLOAD_VERSION}.cmake")
+    message(STATUS "Setting CPM.cmake location to ${CPM_DOWNLOAD_LOCATION}")
 else()
     set(CPM_DOWNLOAD_LOCATION "${CMAKE_BINARY_DIR}/cmake/CPM_${CPM_DOWNLOAD_VERSION}.cmake")
+    message(STATUS "Setting CPM.cmake location to ${CPM_DOWNLOAD_LOCATION}")
 endif()
 
-if(NOT (EXISTS ${CPM_DOWNLOAD_LOCATION}))
-    message(STATUS "Downloading CPM.cmake to ${CPM_DOWNLOAD_LOCATION}")
-    file(DOWNLOAD
-            https://github.com/TheLartians/CPM.cmake/releases/download/v${CPM_DOWNLOAD_VERSION}/CPM.cmake
-            ${CPM_DOWNLOAD_LOCATION}
-            )
-endif()
+set(CPM_DOWNLOAD_RETRY_COUNT 3)
+foreach(DOWNLOAD_ATTEMPT RANGE 1 ${CPM_DOWNLOAD_RETRY_COUNT})
+    if(NOT (EXISTS ${CPM_DOWNLOAD_LOCATION}))
+        message(STATUS "CPM.cmake was not found at ${CPM_DOWNLOAD_LOCATION}")
+        message(STATUS "Attempt: ${DOWNLOAD_ATTEMPT}/${CPM_DOWNLOAD_RETRY_COUNT}: Downloading CPM.cmake...")
+        file(DOWNLOAD
+             https://github.com/TheLartians/CPM.cmake/releases/download/v${CPM_DOWNLOAD_VERSION}/CPM.cmake
+             ${CPM_DOWNLOAD_LOCATION}
+             STATUS DOWNLOAD_STAT
+        )
+        list(GET DOWNLOAD_STAT 0 DOWNLOAD_RES)
+        if(NOT DOWNLOAD_RES EQUAL 0)
+            if (DOWNLOAD_ATTEMPT EQUAL CPM_DOWNLOAD_RETRY_COUNT)
+                message(FATAL_ERROR "Max download attempts exceeded.")
+                break()
+            endif()
+
+            message(STATUS "Download failed. Removing ${CPM_DOWNLOAD_LOCATION} and retrying in 5 seconds...")
+            file(REMOVE ${CPM_DOWNLOAD_LOCATION})
+            execute_process(COMMAND ${CMAKE_COMMAND} -E sleep 5)
+        endif()
+    endif()
+
+    if(EXISTS ${CPM_DOWNLOAD_LOCATION})
+        message(STATUS "CPM.cmake was found at ${CPM_DOWNLOAD_LOCATION}")
+        break()
+    endif()
+endforeach()
 
 include(${CPM_DOWNLOAD_LOCATION})