Re: [PATCH 2/2] difftool: don't assume that default sh is sane

> From: Charles Bailey <cbailey32@bloomberg.net>
> 
> git-difftool used to create a command list script containing $( ... )
> and explicitly call "sh -c" with this list.
> 
> Instead, allow mergetool --tool-help to take a mode parameter and call
> mergetool directly to invoke the show_tool_help function. This mode
> parameter is intented for use solely by difftool.
> 
> Signed-off-by: Charles Bailey <cbailey32@bloomberg.net>
> ---
> Another issue for Solaris. Originally I had a fix for this that
> substituted "@SHELL_PATH@" even inside perl scripts but I felt that
> having an interface for show_tool_help was a little neater all round but
> I welcome alternative views.

>  git-difftool.perl |  6 +-----
>  git-mergetool.sh  | 12 +++++++++++-
>  2 files changed, 12 insertions(+), 6 deletions(-)
> 
> diff --git a/git-difftool.perl b/git-difftool.perl
> index 18ca61e..598fcc2 100755
> --- a/git-difftool.perl
> +++ b/git-difftool.perl
> @@ -47,13 +47,9 @@ sub find_worktree
>  
>  sub print_tool_help
>  {
> -	my $cmd = 'TOOL_MODE=diff';
> -	$cmd .= ' && . "$(git --exec-path)/git-mergetool--lib"';
> -	$cmd .= ' && show_tool_help';
> -
>  	# See the comment at the bottom of file_diff() for the reason behind
>  	# using system() followed by exit() instead of exec().
> -	my $rc = system('sh', '-c', $cmd);
> +	my $rc = system(qw(git mergetool --tool-help=diff));