[CMake] Prevent ExternalProject from updating git submodules

Tue Oct 25 09:12:36 EDT 2016

Sounds like you should consider customizing the git clone with DOWNLOAD_COMMAND. You can do anything you want as a customization...

HTH,
David

> On Oct 24, 2016, at 11:35 PM, Timothy Rae <timothy.rae at sbibits.com> wrote:
> 
> Thanks for the tip, but I'd rather it didn't fetch the documentation submodule at all, as this unnecessarily slows down the build.
> 
>> On Tue, Oct 25, 2016 at 12:29 PM, Hendrik Sattler <post at hendrik-sattler.de> wrote:
>> Hi,
>> 
>> you can tell git where your copy of tree remote url is. This is site-specific and does not change the repository:
>> git config remote."$origirl".url "$newurl"
>> 
>> HS
>> 
>> 
>> Am 25. Oktober 2016 03:52:12 MESZ, schrieb Tim Rae <timothy.rae at sbibits.com>:
>> >Hi all,
>> >
>> >I'm using ExternalProject_Add to add the popular C++ library range-v3
>> >to
>> >one of our projects. However, since the build server only has local
>> >intranet access, and therefore can't access the main github repository,
>> >
>> >we have put a clone of that repo on our local gitlab:
>> >
>> >ExternalProject_Add(range-v3
>> >     PREFIX ${PREFIX_DIR}
>> >     GIT_REPOSITORY ${LOCAL_GITLAB_URI}
>> >)
>> >
>> >The problem is that range-v3 has a documentation submodule that points
>> >to github, so `git clone ${LOCAL_GITLAB_URI} --recursive` would fail
>> >when github is inaccessible, whereas git clone works fine without the
>> >recursive flag.
>> >
>> >I found a previous message from Tim Gallagher on the mailing list
>> >reporting the same problem, but it looks like the issue was never
>> >addressed upstream.
>> >
>> >https://cmake.org/pipermail/cmake/2015-March/060100.html
>> >
>> >Unfortunately, specifying GIT_SUBMODULES "" will add all submodules, so
>> >
>> >it doesn't appear that variable will help to solve the issue. I would
>> >suggest either having a special value like "__NONE__", or having a new
>> >boolean variable like INIT_GIT_SUBMODULES; either of which can be used
>> >to disable the automatic initialization of submodules entirely.
>> >
>> >You could also change the default to NOT pull in submodules. This would
>> >
>> >be much better IMHO, as the current behavior is unintuitive. Most
>> >developers (e.g. myself until yesterday) don't even know what a
>> >submodule is, and are only familiar with using git clone, as opposed to
>> >
>> >git clone --recursive. Obviously this would be a breaking change
>> >though,
>> >so I understand that you probably don't want to go with this option.
>> >
>> >For now I have "solved" the problem by adding a new commit to our
>> >range-v3 fork removing all git submodules, however this makes it more
>> >difficult to get the upstream changes in, so I highly recommend adding
>> >an option to disable the automatic initialization of git submodules.
>> >
>> >Best regards,
>> >Tim
>> >
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