f67139ae6f
Improve FILE(DOWNLOAD ...):
- Add percent complete progress output to the FILE DOWNLOAD
command. This progress output is off by default to
preserve existing behavior. To turn it on, pass
SHOW_PROGRESS as an argument.
- Add EXPECTED_MD5 argument. Verify that the downloaded
file has the expected md5 sum after download is complete.
- Add documentation for SHOW_PROGRESS and EXPECTED_MD5.
When the destination file exists already and has the
expected md5 sum, then do not bother re-downloading
the file. ("Short circuit" return.)
Also, add a test that checks for the status output
indicating that the short circuit behavior is actually
occurring. Use a binary file for the test so that the
md5 sum is guaranteed to be the same on all platforms
regardless of "shifting text file line ending" issues.
Improve ExternalProject:
- Add argument URL_MD5.
- Add verify step that compares md5 sum of .tar.gz file
before extracting it.
- Add md5 check to download step, too, to prevent
unnecessary downloads.
- Emit a warning message when a file is not verified.
Indicate that the file may be corrupt or that no
checksum was specified.
42 lines
829 B
CMake
42 lines
829 B
CMake
set(url "file://@CMAKE_CURRENT_SOURCE_DIR@/FileDownloadInput.png")
|
|
set(dir "@CMAKE_CURRENT_BINARY_DIR@/downloads")
|
|
|
|
message(STATUS "FileDownload:1")
|
|
file(DOWNLOAD
|
|
${url}
|
|
${dir}/file1.png
|
|
TIMEOUT 2
|
|
)
|
|
|
|
message(STATUS "FileDownload:2")
|
|
file(DOWNLOAD
|
|
${url}
|
|
${dir}/file2.png
|
|
TIMEOUT 2
|
|
SHOW_PROGRESS
|
|
)
|
|
|
|
# Two calls in a row, exactly the same arguments.
|
|
# Since downloaded file should exist already for 2nd call,
|
|
# the 2nd call will short-circuit and return early...
|
|
#
|
|
if(EXISTS ${dir}/file3.png)
|
|
file(REMOVE ${dir}/file3.png)
|
|
endif()
|
|
|
|
message(STATUS "FileDownload:3")
|
|
file(DOWNLOAD
|
|
${url}
|
|
${dir}/file3.png
|
|
TIMEOUT 2
|
|
EXPECTED_MD5 d16778650db435bda3a8c3435c3ff5d1
|
|
)
|
|
|
|
message(STATUS "FileDownload:4")
|
|
file(DOWNLOAD
|
|
${url}
|
|
${dir}/file3.png
|
|
TIMEOUT 2
|
|
EXPECTED_MD5 d16778650db435bda3a8c3435c3ff5d1
|
|
)
|