From 5212117924e9fa0d144f29bb87ed7b7386406cfa Mon Sep 17 00:00:00 2001
From: Adam <adam-bloom@users.noreply.github.com>
Date: Wed, 12 May 2021 01:38:47 -0600
Subject: [PATCH] Fix #14523: suppress downloads if a directory exists

---
 CMakeLists.txt       |  6 ++++++
 cmake/download.cmake | 12 +++++++++++-
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 35bcea5103..9abb2e5931 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -401,22 +401,28 @@ if (NOT MACOS_BUNDLE OR (MACOS_BUNDLE AND WITH_TESTS))
     install(CODE "execute_process(COMMAND \"${CMAKE_COMMAND}\" --build \"${CMAKE_CURRENT_BINARY_DIR}\" --target g2)")
     if (DOWNLOAD_TITLE_SEQUENCES)
         # Checks if this version of the title sequences are already installed, updates if necessary
+        # if /data/sequence exists, it will overwrite this anyways (see `install(DIRECTORY "data/" ...)` below)
+        # therefore, the existence of that directory will skip this download
         install(CODE "
             include(${ROOT_DIR}/cmake/download.cmake)
             download_openrct2_zip(
                 ZIP_VERSION ${TITLE_SEQUENCE_VERSION}
                 DOWNLOAD_DIR \$ENV{DESTDIR}${CMAKE_INSTALL_FULL_DATADIR}/${PROJECT_NAME}/sequence/
+                SKIP_IF_EXISTS ${CMAKE_SOURCE_DIR}/data/sequence/
                 ZIP_URL ${TITLE_SEQUENCE_URL}
                 SHA1 ${TITLE_SEQUENCE_SHA1}
             )")
     endif ()
     if (DOWNLOAD_OBJECTS)
         # Checks if this version of the objects are already installed, updates if necessary
+        # if /data/object exists, it will overwrite this anyways (see `install(DIRECTORY "data/" ...)` below)
+        # therefore, the existence of that directory will skip this download
         install(CODE "
             include(${ROOT_DIR}/cmake/download.cmake)
             download_openrct2_zip(
                 ZIP_VERSION ${OBJECTS_VERSION}
                 DOWNLOAD_DIR \$ENV{DESTDIR}${CMAKE_INSTALL_FULL_DATADIR}/${PROJECT_NAME}/object/
+                SKIP_IF_EXISTS ${CMAKE_SOURCE_DIR}/data/object/
                 ZIP_URL ${OBJECTS_URL}
                 SHA1 ${OBJECTS_SHA1}
             )")
diff --git a/cmake/download.cmake b/cmake/download.cmake
index 33ec3635bf..de9d44b135 100644
--- a/cmake/download.cmake
+++ b/cmake/download.cmake
@@ -1,5 +1,6 @@
 function(download_openrct2_zip)
     set(oneValueArgs ZIP_VERSION DOWNLOAD_DIR ZIP_URL SHA1)
+    set(multiValueArgs SKIP_IF_EXISTS)
     cmake_parse_arguments(DOWNLOAD_OPENRCT2 "${options}" "${oneValueArgs}"
                         "${multiValueArgs}" ${ARGN} )
 
@@ -15,9 +16,18 @@ function(download_openrct2_zip)
                 set(DOWNLOAD_ZIP 1)
             endif ()
         else ()
-        set(DOWNLOAD_ZIP 1)
+            set(DOWNLOAD_ZIP 1)
         endif ()
     endif ()
+
+    foreach(check_exist_dir ${DOWNLOAD_OPENRCT2_SKIP_IF_EXISTS})
+        if (EXISTS ${check_exist_dir})
+            message("${check_exist_dir} exists, skipping download")
+            set(DOWNLOAD_ZIP 0)
+            break()
+        endif ()
+    endforeach(check_exist_dir)
+
     if (DOWNLOAD_ZIP)
         message("Downloading ${DOWNLOAD_OPENRCT2_DOWNLOAD_DIR}")
         file(DOWNLOAD