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Re: [PATCH] Fix --xattr-include='*' documentation

From: Pavel Raiskup
Subject: Re: [PATCH] Fix --xattr-include='*' documentation
Date: Wed, 24 Nov 2021 16:06:38 +0100

Updated patch is attached (more appropriate place for the second chunk).


On Wednesday, November 24, 2021 3:32:12 PM CET Pavel Raiskup wrote:
> * doc/tar.texi (Extended File Attributes): The default extraction
> pattern consists of just 'user.*' namespace only.  While on it, try
> to explain the reasons for this default behavior.
> ---
>  doc/tar.texi | 15 ++++++++++++---
>  1 file changed, 12 insertions(+), 3 deletions(-)
> diff --git a/doc/tar.texi b/doc/tar.texi
> index 389a3448..e03ce3d4 100644
> --- a/doc/tar.texi
> +++ b/doc/tar.texi
> @@ -5647,9 +5647,14 @@ Disable extended attributes support.  This is the 
> default.
>  Attribute names are strings prefixed by a @dfn{namespace} name and a dot.
>  Currently, four namespaces exist: @samp{user}, @samp{trusted},
>  @samp{security} and @samp{system}.  By default, when @option{--xattr}
> -is used, all names are stored in the archive (or extracted, if using
> -@option{--extract}).  This can be controlled using the following
> -options:
> +is used, all names are stored in the archive (with @option{--create}),
> +but only @samp{user} namespace is extracted (if using @option{--extract}).
> +The reason for this behavior is that any other, system defined attributes
> +don't provide us sufficient compatibility promise.  Storing all attributes
> +is safe operation for the archiving purposes.  Though extracting those
> +(often security related) attributes on a different system than originally
> +archived can lead to extraction failures, or even misinterpretations.
> +This behavior can be controlled using the following options:
>  @table @option
>  @item --xattrs-exclude=@var{pattern}
> @@ -5659,6 +5664,10 @@ Specify exclude pattern for extended attributes.
>  Specify include pattern for extended attributes.
>  @end table
> +Users shall manually check the attributes are binary compatible with the
> +target system first, before any other namespace is extracted with an
> +explicit @option{--xattr-include} option.
> +
>  Here, the @var{pattern} is a globbing pattern.  For example, the
>  following command:

Attachment: 0001-Fix-xattr-include-documentation.patch
Description: Text Data

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