[Buildroot] [RFC/PATCH] download/git: support Git LFS

[John Keeping <john@metanate.com>]

On Fri, 27 Apr 2018 11:17:34 +0100
John Keeping <john@metanate.com> wrote:

> On Thu, 26 Apr 2018 22:24:40 +0200
> "Yann E. MORIN" <yann.morin.1998@free.fr> wrote:
> 
> > On 2018-04-26 18:36 +0100, John Keeping spake thusly:  
> > > Git Large File Storage replaces large files with text pointers in
> > > the Git repository while storing the contents on a remote server.
> > > If a repository is using this extension, then git-lfs must be used
> > > to checkout the large files before the source archive is
> > > generated.
> > > 
> > > Signed-off-by: John Keeping <john@metanate.com>
> > > ---
> > > Currently this relies on git-lfs being installed on the host
> > > system and I'm not sure if that's considered acceptable or
> > > not.    
> > 
> > I think that would be acceptable, but would require a dependency
> > check, basically, something like
> > 
> >   - support/depenencies/check-host-git.mk :
> > 
> >         ifeq (,$(call suitable-host-package,git,$(GIT) $(if
> > $(BR2_GIT_NEEDS_LFS).lfs))) $(error You need a git that supports
> > git-lfs) endif
> > 
> >   - support/depenencies/check-host-git.sh
> > 
> >         #!/bin/sh
> > 
> >         GIT="${1}"
> >         LFS="${2}"
> > 
> >         # If LFS not required, any git is OK
> >         if [ -z "${LFS}" ]; then
> >             echo "${GIT}"
> >             exit 0
> >         fi
> > 
> >         # Test LFS
> >         if ${GIT} help lfs >/dev/null 2>&1; then
> >             # Works!
> >             echo "${GIT}"
> >             exit 0
> >         fi
> > 
> >         exit 1
> > 
> > Now, all you have, is to find a way to synthetise
> > BR2_GIT_NEEDS_LFS. ;-)  
> 
> This makes sense, I'll add this check for v2.

Actually, it looks like adding "git-lfs" to DL_TOOLS_DEPENDENCIES works
and it's a lot simpler.  What do you think about handling it that way?


Regards,
John