[PATCH 3/4] submodule--helper list: lose the extra prefix option

[Stefan Beller <sbeller@google.com>]

The usual early machinery of Git is to change the directory to
the top level of the working tree and pass the actual path inside
the working tree as `prefix` to the command being run.
This is the case both for commands written in C (where the
prefix is passed into the command in a function parameter) as
well as in git-submodule.sh where the setup code runs

  wt_prefix=$(git rev-parse show-prefix)
  cd_to_top_level

So the prefix passed into the `submodule--helper list` is actually
the relative path inside the working tree, but we were not using
the standard way of passing it through.

Adhere to Gits standard of passing the relative path inside the
working tree by passing it via -C.

We do not need to pass it for `submodule foreach` as that command
doesn't take further arguments ('$@') to operate on a subset of
submodules, such that it is irrelevant for listing the submodules.
The computation of the displaypath ('Entering <path>') is done
separately there.

Signed-off-by: Stefan Beller <sbeller@google.com>
---
 builtin/submodule--helper.c |  5 +----
 git-submodule.sh            | 12 ++++++------
 2 files changed, 7 insertions(+), 10 deletions(-)

diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index ed764c9..2983783 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -68,14 +68,11 @@ static int module_list(int argc, const char **argv, const char *prefix)
 	struct module_list list = MODULE_LIST_INIT;
 
 	struct option module_list_options[] = {
-		OPT_STRING(0, "prefix", &prefix,
-			   N_("path"),
-			   N_("alternative anchor for relative paths")),
 		OPT_END()
 	};
 
 	const char *const git_submodule_helper_usage[] = {
-		N_("git submodule--helper list [--prefix=<path>] [<path>...]"),
+		N_("git submodule--helper list [<path>...]"),
 		NULL
 	};
 
diff --git a/git-submodule.sh b/git-submodule.sh
index 6b18a03..1f7ad6e 100755
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -407,7 +407,7 @@ cmd_foreach()
 	# command in the subshell (and a recursive call to this function)
 	exec 3<&0
 
-	git submodule--helper list --prefix "$wt_prefix"|
+	git submodule--helper list |
 	while read mode sha1 stage sm_path
 	do
 		die_if_unmatched "$mode"
@@ -467,7 +467,7 @@ cmd_init()
 		shift
 	done
 
-	git submodule--helper list --prefix "$wt_prefix" "$@" |
+	git -C "$wt_prefix" submodule--helper list "$@" |
 	while read mode sha1 stage sm_path
 	do
 		die_if_unmatched "$mode"
@@ -549,7 +549,7 @@ cmd_deinit()
 		die "$(eval_gettext "Use '.' if you really want to deinitialize all submodules")"
 	fi
 
-	git submodule--helper list --prefix "$wt_prefix" "$@" |
+	git -C "$wt_prefix" submodule--helper list "$@" |
 	while read mode sha1 stage sm_path
 	do
 		die_if_unmatched "$mode"
@@ -683,7 +683,7 @@ cmd_update()
 	fi
 
 	cloned_modules=
-	git submodule--helper list --prefix "$wt_prefix" "$@" | {
+	git -C "$wt_prefix" submodule--helper list "$@" | {
 	err=
 	while read mode sha1 stage sm_path
 	do
@@ -1121,7 +1121,7 @@ cmd_status()
 		shift
 	done
 
-	git submodule--helper list --prefix "$wt_prefix" "$@" |
+	git -C "$wt_prefix" submodule--helper list "$@" |
 	while read mode sha1 stage sm_path
 	do
 		die_if_unmatched "$mode"
@@ -1199,7 +1199,7 @@ cmd_sync()
 		esac
 	done
 	cd_to_toplevel
-	git submodule--helper list --prefix "$wt_prefix" "$@" |
+	git -C "$wt_prefix" submodule--helper list "$@" |
 	while read mode sha1 stage sm_path
 	do
 		die_if_unmatched "$mode"
-- 
2.8.0.rc4.10.g52f3f33