[CMake] downloading ftp URL problems

[Cristian Adam]

On Sat, Jan 27, 2018 at 12:12 PM, Kris Thielemans <
kris.f.thielemans at gmail.com> wrote:

> Dear all
>
>
>
> I have had no response to this. The problem continues with CMake 3.10.2. I
> have no idea what causes this or how to fix it. Any help would be much
> appreciated.
>
>
>
> Kris
>
>
>
> *From:* Kris Thielemans
>
> *Sent:* 19 December 2017 08:15
> *To:* cmake at cmake.org
> *Subject:* downloading ftp URL problems
>
>
>
> Hi
>
>
>
> I’m try to get a file via ftp in EXTERNAL_PROJECT_ADD by specifying the
> URL. This takes a long time on my Windows machine using CMake 3.10.1 (and
> previous versions of CMake) as it needs multiple retries:
>
>
>
> 2>  -- Using src='ftp://ftp.fftw.org/pub/fftw/fftw-3.3.5-dll64.zip'
>
> 2>  -- Retrying...
>
> 2>  -- Using src='ftp://ftp.fftw.org/pub/fftw/fftw-3.3.5-dll64.zip'
>
> 2>  -- Retry after 5 seconds (attempt #2) ...
>
> 2>  -- Using src='ftp://ftp.fftw.org/pub/fftw/fftw-3.3.5-dll64.zip'
>
> 2>  -- Retry after 5 seconds (attempt #3) ...
>
> 2>  -- Using src='ftp://ftp.fftw.org/pub/fftw/fftw-3.3.5-dll64.zip'
>
> 2>  -- Retry after 15 seconds (attempt #4) ...
>
> 2>  -- Using src='ftp://ftp.fftw.org/pub/fftw/fftw-3.3.5-dll64.zip'
>
> 2>  -- Retry after 60 seconds (attempt #5) ...
>
> 2>  -- Using src='ftp://ftp.fftw.org/pub/fftw/fftw-3.3.5-dll64.zip'
>
> -- [download 0% complete]
>
> ...
>
>
>
> When using on https link, the download starts immediately.
>
>
>
> Any suggestions why this happens, what I can do about it, or how I could
> specify an initial sleep period to skip the first retries (but I’m not sure
> if that’d help)?
>
>
>
> Some more detail:
>
> I’m using Windows 10 home with latest CMake installed via the msi.
>
>
>
> Using the URL in a browser  (firefox) works fine but does need a ~5s wait
> before I get the “save” dialog box.
>
>
>
> Checking the created download.cmake, it is just a loop with different
> sleep_seconds doing the following
>
>
>
> Set(url “ftp://ftp.fftw.org/pub/fftw/fftw-3.3.5-dll64.zip”)
>
> execute_process(COMMAND "${CMAKE_COMMAND}" -E sleep "${sleep_seconds}")
>
>
>
>    file(
>
>        DOWNLOAD
>
>        "${url}" "C:/Users/krisf/Documents/devel/fftw-3.3.5-dll64.zip"
>
>        SHOW_PROGRESS
>
>        # no TIMEOUT
>
>        STATUS status
>
>        LOG log
>
>    )
>
>
>
> Thanks for your help
>
>
>

CMake, as far as I know, uses libcurl to handle network transfers.
You should compare cmake downloading with a curl build
<https://curl.haxx.se/download.html>not with Firefox.
Rumor has it that curl is part of Windows now.

If the https link works instantly, why not use it also with cmake?

Cheers,
Cristian.
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