Try installing patch/git for R bundled

Author: raulcd

ci/scripts/r_docker_configure.sh

@@ -73,7 +73,8 @@ fi
 
 # Install rsync for bundling cpp source and curl to make sure it is installed on all images,
 # cmake is now a listed sys req.
-$PACKAGE_MANAGER install -y rsync cmake curl
+# Install patch/git for applying patches to bundled dependencies via FetchContent.
+$PACKAGE_MANAGER install -y rsync cmake curl git patch
 
 # Update clang version to latest available.
 # This is only for rhub/clang20. If we change the base image from rhub/clang20,

cpp/cmake_modules/ThirdpartyToolchain.cmake

@@ -3401,21 +3401,18 @@ function(build_google_cloud_cpp_storage)
   set(GOOGLE_CLOUD_CPP_PATCH_COMMAND)
   find_program(PATCH patch)
   if(PATCH)
-    list(APPEND
-         GOOGLE_CLOUD_CPP_PATCH_COMMAND
-         ${PATCH}
-         -p1
-         -i)
+    set(GOOGLE_CLOUD_CPP_PATCH_COMMAND
+        ${PATCH} -p1 -i ${CMAKE_CURRENT_LIST_DIR}/google-cloud-cpp-disable-install.patch)
   else()
     find_program(GIT git)
     if(GIT)
-      list(APPEND GOOGLE_CLOUD_CPP_PATCH_COMMAND ${GIT} apply)
+      set(GOOGLE_CLOUD_CPP_PATCH_COMMAND
+          ${GIT} apply ${CMAKE_CURRENT_LIST_DIR}/google-cloud-cpp-disable-install.patch)
+    else()
+      message(FATAL_ERROR "Building google-cloud-cpp from source requires either 'patch' or 'git' to be available"
+      )
     endif()
   endif()
-  if(GOOGLE_CLOUD_CPP_PATCH_COMMAND)
-    list(APPEND GOOGLE_CLOUD_CPP_PATCH_COMMAND
-         ${CMAKE_CURRENT_LIST_DIR}/google-cloud-cpp-disable-install.patch)
-  endif()
 
   fetchcontent_declare(google_cloud_cpp
                        ${FC_DECLARE_COMMON_OPTIONS}