[cmake-developers] Unexpected bad status for file DOWNLOAD for http://*.xz URLs

[Eric Noulard]

2013/7/12 Alan W. Irwin <irwin at beluga.phys.uvic.ca>:
> On 2013-07-11 16:30-0700 Alan W. Irwin wrote:
>
>> These commands
>>
>> file(DOWNLOAD
>> "http://download.gnome.org/sources/glib/2.32/glib-2.32.1.tar.xz"
>>
>> "/home/software/plplot_svn/HEAD/plplot_allura/cmake/build_projects/cmake_downloaded_glib-2.32.1.tar.xz"
>> SHOW_PROGRESS STATUS status)
>> message(STATUS "Download status = ${status}")
>>
>> instantly give me the following results:
>>
>> -- [download 0% complete]
>> -- Download status = 1;"unsupported protocol"

[...]

Then may be the "unsupported protocol" is not http...keep reading

>
> So I hope someone else will also try experiments to see if they can
> discover _any_ http://*.tar.xz URL that can be downloaded by
> file(DOWNLOAD...).

If I use the curl -L options you use I can see:

GET /sources/glib/2.32/glib-2.32.1.tar.xz HTTP/1.1
Location: https://download.gnome.org/sources/glib/2.32/glib-2.32.1.tar.xz
Issue another request to this URL:
'https://download.gnome.org/sources/glib/2.32/glib-2.32.1.tar.xz
GET /sources/glib/2.32/glib-2.32.1.tar.xz
Location: http://ftp.gnome.org/pub/GNOME/sources/glib/2.32/glib-2.32.1.tar.xz
Issue another request to this URL:
'http://ftp.gnome.org/pub/GNOME/sources/glib/2.32/glib-2.32.1.tar.xz
GET /pub/GNOME/sources/glib/2.32/glib-2.32.1.tar.xz
...

then it seems that the initial http URL is redirected to https which
is redirected to ftp...

then I tried my CMake build with with your:
file(DOWNLOAD
"http://download.gnome.org/sources/glib/2.32/glib-2.32.1.tar.xz"
"/tmp/cmake_downloaded_glib-2.32.1.tar.xz"
SHOW_PROGRESS STATUS status)
message(STATUS "Download status = ${status}")

and it works as expected.

so my best bet is that the CMake command your are using has no SSL support
which makes the "https" handling fail with "unsupported protocol".


--
Erk
L'élection n'est pas la démocratie -- http://www.le-message.org