[Buildroot] [PATCH 1/1] support/download: Fix tarball generation - master branch patch

[Yann E. MORIN]

Jean-Pierre, All,

On 2021-03-18 08:28 +0100, Jean-pierre Cartal spake thusly:
> fix tarball generation with symlinks pointing to ./something
> 
>     When a --transform expression is provided, it is by default also applied
>     to the target of a symlink.
> 
>     When we create tarballs (from git or svn checkouts), we use a --transform
>     expression to replace the leading ./ with the package name and version.
> 
>     This causes issues when a package contains symlinks that points to
>     ./something, as the leading './' is also replaced.
> 
>     Fix that by using the 'S' transformation scope flag, as described in the
>     tar manual:
>         https://www.gnu.org/software/tar/manual/html_node/transform.html#transform
> 
>         In addition, several transformation scope flags are supported, that
>         control to what files transformations apply. These are:
> 
>         ‘r’ Apply transformation to regular archive members.
>         ‘R’ Do not apply transformation to regular archive members.
>         ‘s’ Apply transformation to symbolic link targets.
>         ‘S’ Do not apply transformation to symbolic link targets.
>         ‘h’ Apply transformation to hard link targets.
>         ‘H’ Do not apply transformation to hard link targets.
> 
>         Default is ‘rsh’ [...].
> 
>     Fixes: #13616

The commit log was needlessly indented, so I've redeuced the
indentation. I also added a scriptlet to test existing hashes have not
been impacted.

Applied to master, thanks.

Regards,
Yann E. MORIN.

> Signed-off-by: Jean-pierre Cartal <jpcartal at free.fr>
> ---
>  support/download/helpers | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/support/download/helpers b/support/download/helpers
> index 57cc9fef44..40d5eea591 100755
> --- a/support/download/helpers
> +++ b/support/download/helpers
> @@ -59,7 +59,7 @@ mk_tar_gz() {
>      LC_ALL=C sort <"${tmp}.list" >"${tmp}.sorted"
>  
>      # Create POSIX tarballs, since that's the format the most reproducible
> -    tar cf - --transform="s#^\./#${base_dir}/#" \
> +    tar cf - --transform="s#^\./#${base_dir}/#S" \
>               --numeric-owner --owner=0 --group=0 --mtime="${date}" \
>               --format=posix --pax-option="${pax_options}" \
>               -T "${tmp}.sorted" >"${tmp}.tar"
> -- 
> 2.30.2
> 
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