[Buildroot] [RFC PATCH 1/3] download/git: fix fetch all refs for old git

[Yann E. MORIN]

Ricardo, All,

On 2018-04-12 06:28 -0300, Ricardo Martincoski spake thusly:
> With old versions of git, when the shallow fetch was not enough, the
> download fails like this:
>  Fetching all references
>  Could not fetch special ref 'sha1'; assuming it is not special.
>  fatal: reference is not a tree: sha1
> 
> At git version 1.9.0, the semantics of the option -t for git fetch
> changed, see upstream commit [1]:
> < 1.9.0: "fetch tags without also fetching other references";
> >=1.9.0: "fetch tags *in addition to* other stuff".
> 
> Fall back to explicit refspec to support distros that use ancient
> versions of git.
[--SNIP--]
> diff --git a/support/download/git b/support/download/git
> index 381f3ceeb3..1b09e5c750 100755
> --- a/support/download/git
> +++ b/support/download/git
> @@ -76,7 +76,7 @@ if [ -n "$(_git ls-remote origin "'${cset}'" 2>&1)" ]; then
>  fi
>  if [ ${git_done} -eq 0 ]; then
>      printf "Fetching all references\n"
> -    _git fetch origin -t
> +    _git fetch origin -u "'+refs/tags/*:refs/tags/*'" "'+refs/heads/*:refs/remotes/origin/*'"

Why don't we just run:

    git fetch origin
    git fetch origin -t

As I understand it:

                    ancient git         | new git
--------------------------------------------------------------------
git fetch     | fetch all refs but tags | fetches all refs but tags
git fetch -t  | fetches only tags       | fetch all refs and tags

Right?

Regards,
Yann E. MORIN.

>  fi
>  
>  # Try to get the special refs exposed by some forges (pull-requests for
> -- 
> 2.14.1
> 

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