[PATCH v1] env: setenv add resolve value option

[Tom Rini]

On Tue, Nov 02, 2021 at 03:19:14PM +0800, Artem Lapkin wrote:

> Add possibility setup env variable with additional resolving vars inside
> value.
> 
> Usage examples
> 
> => setenv a hello
> => setenv b world
> => setenv c '${a} ${b}'
> => setenv -r d '${c}! ${a}...'
> => printenv d
> d=hello world! hello...
> 
> /* internal usage example */
> env_resolve("d", "${c}! ${a}...");
> /* d="hello world! hello..." */
> 
> Notes
> 
> Resolving works only for ${var} "bracket" and didn't workd for
> "unbracket" $var
> 
> => setenv -r d '$c! $a...'
> => printenv d
> d=$c! $a...
> 
> Signed-off-by: Artem Lapkin <art at khadas.com>

The high level problem I have with this patch is that we keep going back
to "we really need to update to a modern hush (or other shell) rather
than patching new features in to our ancient fork".

-- 
Tom
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