git-submodule.sh: separate parens by a space to avoid confusing some shells

Some shells interpret '(( ))' according to the rules for arithmetic
expansion.  This may not follow POSIX, but is prevalent in commonly used
shells.  Bash does not have a problem with this particular instance of
'((', likely because it is not followed by a '))', but the public domain
ksh does, and so does ksh on IRIX 6.5.

So, add a space between the parenthesis to avoid confusing these shells.

Signed-off-by: Brandon Casey <casey@nrlssc.navy.mil>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/git-submodule.sh b/git-submodule.sh
index b010a673097a9cfcf009b307114669b6221d066c..4361ae418cfc032f793d14af057e2b178922ca1f 100755 (executable)
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -491,7 +491,7 @@ cmd_update()
                                # Run fetch only if $sha1 isn't present or it
                                # is not reachable from a ref.
                                (clear_local_git_env; cd "$path" &&
-                                       ((rev=$(git rev-list -n 1 $sha1 --not --all 2>/dev/null) &&
+                                       ( (rev=$(git rev-list -n 1 $sha1 --not --all 2>/dev/null) &&
                                         test -z "$rev") || git-fetch)) ||
                                die "Unable to fetch in submodule path '$path'"
                        fi