From: Charles Bailey <cbaile...@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 <cbaile...@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 $rc = system(qw(git mergetool --tool-help=diff));
        exit($rc | ($rc >> 8));
 }
 
diff --git a/git-mergetool.sh b/git-mergetool.sh
index e969dd0..d32b663 100755
--- a/git-mergetool.sh
+++ b/git-mergetool.sh
@@ -320,7 +320,17 @@ guessed_merge_tool=false
 while test $# != 0
 do
        case "$1" in
-       --tool-help)
+       --tool-help*)
+               case "$#,$1" in
+               1,*=*)
+                       TOOL_MODE=$(expr "z$1" : 'z-[^=]*=\(.*\)')
+                       ;;
+               1,--tool-help)
+                       ;;
+               *)
+                       usage
+                       ;;
+               esac
                show_tool_help
                ;;
        -t|--tool*)
-- 
2.0.2.611.g8c85416

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