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-rw-r--r--Documentation/git-checkout.txt2
-rw-r--r--submodule.c3
-rwxr-xr-xt/lib-submodule-update.sh17
3 files changed, 21 insertions, 1 deletions
diff --git a/Documentation/git-checkout.txt b/Documentation/git-checkout.txt
index e108b0f74..bfa64ca5c 100644
--- a/Documentation/git-checkout.txt
+++ b/Documentation/git-checkout.txt
@@ -264,6 +264,8 @@ section of linkgit:git-add[1] to learn how to operate the `--patch` mode.
local modifications in a submodule would be overwritten the checkout
will fail unless `-f` is used. If nothing (or --no-recurse-submodules)
is used, the work trees of submodules will not be updated.
+ Just like linkgit:git-submodule[1], this will detach the
+ submodules HEAD.
<branch>::
Branch to checkout; if it refers to a branch (i.e., a name that,
diff --git a/submodule.c b/submodule.c
index bb531e0e5..95e6aff2b 100644
--- a/submodule.c
+++ b/submodule.c
@@ -1670,7 +1670,8 @@ int submodule_move_head(const char *path,
cp.dir = path;
prepare_submodule_repo_env(&cp.env_array);
- argv_array_pushl(&cp.args, "update-ref", "HEAD", new, NULL);
+ argv_array_pushl(&cp.args, "update-ref", "HEAD",
+ "--no-deref", new, NULL);
if (run_command(&cp)) {
ret = -1;
diff --git a/t/lib-submodule-update.sh b/t/lib-submodule-update.sh
index bb94c2320..9058bf978 100755
--- a/t/lib-submodule-update.sh
+++ b/t/lib-submodule-update.sh
@@ -689,6 +689,23 @@ test_submodule_switch_recursing_with_args () {
test_submodule_content sub1 origin/add_sub1
)
'
+ test_expect_success "$command: submodule branch is not changed, detach HEAD instead" '
+ prolog &&
+ reset_work_tree_to_interested add_sub1 &&
+ (
+ cd submodule_update &&
+ git -C sub1 checkout -b keep_branch &&
+ git -C sub1 rev-parse HEAD >expect &&
+ git branch -t check-keep origin/modify_sub1 &&
+ $command check-keep &&
+ test_superproject_content origin/modify_sub1 &&
+ test_submodule_content sub1 origin/modify_sub1 &&
+ git -C sub1 rev-parse keep_branch >actual &&
+ test_cmp expect actual &&
+ test_must_fail git -C sub1 symbolic-ref HEAD
+ )
+ '
+
# Replacing a tracked file with a submodule produces a checked out submodule
test_expect_success "$command: replace tracked file with submodule checks out submodule" '
prolog &&