Merge pull request #1704 from kerautret/fixConan

Fix cmake conan download issue

.github/PULL_REQUEST_TEMPLATE.md

@@ -9,4 +9,4 @@
 - [ ] Documentation module page added or updated.
 - [ ] New entry in the [ChangeLog.md](https://github.com/DGtal-team/DGtal/blob/master/ChangeLog.md) added.
 - [ ] No warning raised in Debug mode.
-- [ ] All continuous integration tests pass (Github Actions & appveyor)
+- [ ] All continuous integration tests pass (Github Actions)

ChangeLog.md

@@ -34,6 +34,8 @@
 
 ## Bug fixes
 - *General*
+  - Fix conan file upload issue and log message. (Bertrand Kerautret,
+    [#1704](https://github.com/DGtal-team/DGtal/pull/1704))
   - Fix of couple of doxygen warnings that cause errors on Github Actions
     CI bots. (David Coeurjolly, [#1672](https://github.com/DGtal-team/DGtal/pull/1672))
   - Removing "WITH_BENCHMARK" option as Google Benchmark is already included when building

cmake/CheckDGtalDependencies.cmake

@@ -19,10 +19,31 @@ if (ENABLE_CONAN)
     message(STATUS "Downloading conan.cmake from https://github.com/conan-io/cmake-conan")
     file(DOWNLOAD "https://raw.githubusercontent.com/conan-io/cmake-conan/0.18.1/conan.cmake"
                 "${CMAKE_BINARY_DIR}/conan.cmake"
-                TLS_VERIFY ON)
+                 STATUS DOWNLOAD_STATUS
+                 TLS_VERIFY ON)
+    list(GET DOWNLOAD_STATUS 0 STATUS_CODE)
+    list(GET DOWNLOAD_STATUS 1 ERROR_MESSAGE)
+    # Check if download was successful.
+    if(${STATUS_CODE} EQUAL 0)
+       message(STATUS "Download completed successfully!")
+    else()
+       message(STATUS "Error occurred during download: ${ERROR_MESSAGE}")
+       message(STATUS "Trying turning TLS_VERIFY OFF")
+       file(DOWNLOAD "https://raw.githubusercontent.com/conan-io/cmake-conan/0.18.1/conan.cmake"
+                     "${CMAKE_BINARY_DIR}/conan.cmake"
+                      STATUS DOWNLOAD_STATUS
+                      TLS_VERIFY OFF)
+       list(GET DOWNLOAD_STATUS 0 STATUS_CODE)
+       list(GET DOWNLOAD_STATUS 1 ERROR_MESSAGE)                   
+       if(${STATUS_CODE} EQUAL 0)
+         message(STATUS "Download completed successfully!")
+       else()
+         message(FATAL_ERROR "Error occurred during download: ${ERROR_MESSAGE}")
+       endif()
+    endif()
   endif()
 
-  include(${CMAKE_BINARY_DIR}/conan.cmake)
+  include("${CMAKE_BINARY_DIR}/conan.cmake")
 
   conan_cmake_configure(REQUIRES zlib/1.2.13
                                  boost/1.81.0