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Meta: Download files at configure time a bit more atomically

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Download files to a temporary location, then only move the downloaded
file to the real location once the download is complete. This prevents
CMake from being confused about partially-downloaded files, e.g. if
someone presses ctrl+c in the middle of a download.

Note the GN build already behaves this way.
This commit is contained in:
Timothy Flynn
2024-05-23 12:08:24 -04:00
committed by Tim Flynn
parent ec63f442f9
commit 2f4e2436e8
1 changed files with 5 additions and 2 deletions
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7
Meta/CMake/utils.cmake
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@@ -210,20 +210,23 @@ function(download_file_multisource urls path)
if (NOT ENABLE_NETWORK_DOWNLOADS) if (NOT ENABLE_NETWORK_DOWNLOADS)
message(FATAL_ERROR "${path} does not exist, and unable to download it") message(FATAL_ERROR "${path} does not exist, and unable to download it")
endif() endif()
get_filename_component(file "${path}" NAME) get_filename_component(file "${path}" NAME)
set(tmp_path "${path}.tmp")
foreach(url ${urls}) foreach(url ${urls})
message(STATUS "Downloading file ${file} from ${url}") message(STATUS "Downloading file ${file} from ${url}")
file(DOWNLOAD "${url}" "${path}" INACTIVITY_TIMEOUT 10 STATUS download_result ${DOWNLOAD_SHA256}) file(DOWNLOAD "${url}" "${tmp_path}" INACTIVITY_TIMEOUT 10 STATUS download_result ${DOWNLOAD_SHA256})
list(GET download_result 0 status_code) list(GET download_result 0 status_code)
list(GET download_result 1 error_message) list(GET download_result 1 error_message)
if (status_code EQUAL 0) if (status_code EQUAL 0)
file(RENAME "${tmp_path}" "${path}")
break() break()
endif() endif()
file(REMOVE "${path}") file(REMOVE "${tmp_path}")
message(WARNING "Failed to download ${url}: ${error_message}") message(WARNING "Failed to download ${url}: ${error_message}")
endforeach() endforeach()