CMake/Modules/ExternalProject-download.cm...

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Simplify CMake per-source license notices Per-source copyright/license notice headers that spell out copyright holder names and years are hard to maintain and often out-of-date or plain wrong. Precise contributor information is already maintained automatically by the version control tool. Ultimately it is the receiver of a file who is responsible for determining its licensing status, and per-source notices are merely a convenience. Therefore it is simpler and more accurate for each source to have a generic notice of the license name and references to more detailed information on copyright holders and full license terms. Our `Copyright.txt` file now contains a list of Contributors whose names appeared source-level copyright notices. It also references version control history for more precise information. Therefore we no longer need to spell out the list of Contributors in each source file notice. Replace CMake per-source copyright/license notice headers with a short description of the license and links to `Copyright.txt` and online information available from "https://cmake.org/licensing". The online URL also handles cases of modules being copied out of our source into other projects, so we can drop our notices about replacing links with full license text. Run the `Utilities/Scripts/filter-notices.bash` script to perform the majority of the replacements mechanically. Manually fix up shebang lines and trailing newlines in a few files. Manually update the notices in a few files that the script does not handle.
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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
cmake_minimum_required(VERSION 3.5)
function(check_file_hash has_hash hash_is_good)
if("${has_hash}" STREQUAL "")
message(FATAL_ERROR "has_hash Can't be empty")
endif()
if("${hash_is_good}" STREQUAL "")
message(FATAL_ERROR "hash_is_good Can't be empty")
endif()
if("@ALGO@" STREQUAL "")
# No check
set("${has_hash}" FALSE PARENT_SCOPE)
set("${hash_is_good}" FALSE PARENT_SCOPE)
return()
endif()
set("${has_hash}" TRUE PARENT_SCOPE)
message(STATUS "verifying file...
file='@LOCAL@'")
file("@ALGO@" "@LOCAL@" actual_value)
if(NOT "${actual_value}" STREQUAL "@EXPECT_VALUE@")
set("${hash_is_good}" FALSE PARENT_SCOPE)
message(STATUS "@ALGO@ hash of
@LOCAL@
does not match expected value
expected: '@EXPECT_VALUE@'
actual: '${actual_value}'")
else()
set("${hash_is_good}" TRUE PARENT_SCOPE)
endif()
endfunction()
function(sleep_before_download attempt)
if(attempt EQUAL 0)
return()
endif()
if(attempt EQUAL 1)
message(STATUS "Retrying...")
return()
endif()
set(sleep_seconds 0)
if(attempt EQUAL 2)
set(sleep_seconds 5)
elseif(attempt EQUAL 3)
set(sleep_seconds 5)
elseif(attempt EQUAL 4)
set(sleep_seconds 15)
elseif(attempt EQUAL 5)
set(sleep_seconds 60)
elseif(attempt EQUAL 6)
set(sleep_seconds 90)
elseif(attempt EQUAL 7)
set(sleep_seconds 300)
else()
set(sleep_seconds 1200)
endif()
message(STATUS "Retry after ${sleep_seconds} seconds (attempt #${attempt}) ...")
execute_process(COMMAND "${CMAKE_COMMAND}" -E sleep "${sleep_seconds}")
endfunction()
if("@LOCAL@" STREQUAL "")
message(FATAL_ERROR "LOCAL can't be empty")
endif()
if("@REMOTE@" STREQUAL "")
message(FATAL_ERROR "REMOTE can't be empty")
endif()
if(EXISTS "@LOCAL@")
check_file_hash(has_hash hash_is_good)
if(has_hash)
if(hash_is_good)
message(STATUS "File already exists and hash match (skip download):
file='@LOCAL@'
@ALGO@='@EXPECT_VALUE@'"
)
return()
else()
message(STATUS "File already exists but hash mismatch. Removing...")
file(REMOVE "@LOCAL@")
endif()
else()
message(STATUS "File already exists but no hash specified (use URL_HASH):
file='@LOCAL@'
Old file will be removed and new file downloaded from URL."
)
file(REMOVE "@LOCAL@")
endif()
endif()
set(retry_number 5)
message(STATUS "Downloading...
dst='@LOCAL@'
timeout='@TIMEOUT_MSG@'"
)
foreach(i RANGE ${retry_number})
sleep_before_download(${i})
foreach(url @REMOTE@)
message(STATUS "Using src='${url}'")
@TLS_VERIFY_CODE@
@TLS_CAINFO_CODE@
file(
DOWNLOAD
"${url}" "@LOCAL@"
@SHOW_PROGRESS@
@TIMEOUT_ARGS@
STATUS status
LOG log
@USERPWD_ARGS@
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@HTTP_HEADERS_ARGS@
)
list(GET status 0 status_code)
list(GET status 1 status_string)
if(status_code EQUAL 0)
check_file_hash(has_hash hash_is_good)
if(has_hash AND NOT hash_is_good)
message(STATUS "Hash mismatch, removing...")
file(REMOVE "@LOCAL@")
else()
message(STATUS "Downloading... done")
return()
endif()
else()
string(APPEND logFailedURLs "error: downloading '${url}' failed
status_code: ${status_code}
status_string: ${status_string}
log:
--- LOG BEGIN ---
${log}
--- LOG END ---
"
)
endif()
endforeach()
endforeach()
message(FATAL_ERROR "Each download failed!
${logFailedURLs}
"
)