submodule add: If --branch is given, record it in .gitmodules

This allows you to easily record a submodule.<name>.branch option in
.gitmodules when you add a new submodule.  With this patch,

  $ git submodule add -b <branch> <repository> [<path>]
  $ git config -f .gitmodules submodule.<path>.branch <branch>

reduces to

  $ git submodule add -b <branch> <repository> [<path>]

This means that future calls to

  $ git submodule update --remote ...

will get updates from the same branch that you used to initialize the
submodule, which is usually what you want.

Signed-off-by: W. Trevor King <wking@tremily.us>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/git-submodule.txt b/Documentation/git-submodule.txt
index 8bf173a..b1996f1 100644 (file)
--- a/Documentation/git-submodule.txt
+++ b/Documentation/git-submodule.txt
@@ -208,6 +208,8 @@ OPTIONS
 -b::
 --branch::
        Branch of repository to add as submodule.
+       The name of the branch is recorded as `submodule.<path>.branch` in
+       `.gitmodules` for `update --remote`.
 
 -f::
 --force::

diff --git a/git-submodule.sh b/git-submodule.sh
index 6ae51c6..22ec5b6 100755 (executable)
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -417,6 +417,10 @@ Use -f if you really want to add it." >&2
 
        git config -f .gitmodules submodule."$sm_name".path "$sm_path" &&
        git config -f .gitmodules submodule."$sm_name".url "$repo" &&
+       if test -n "$branch"
+       then
+               git config -f .gitmodules submodule."$sm_name".branch "$branch"
+       fi &&
        git add --force .gitmodules ||
        die "$(eval_gettext "Failed to register submodule '\$sm_path'")"
 }

diff --git a/t/t7400-submodule-basic.sh b/t/t7400-submodule-basic.sh
index de7d453..2683cba 100755 (executable)
--- a/t/t7400-submodule-basic.sh
+++ b/t/t7400-submodule-basic.sh
@@ -133,6 +133,7 @@ test_expect_success 'submodule add --branch' '
        (
                cd addtest &&
                git submodule add -b initial "$submodurl" submod-branch &&
+               test "initial" = "$(git config -f .gitmodules submodule.submod-branch.branch)" &&
                git submodule init
        ) &&