[PATCH 4/4] submodule deinit: unset core.worktree

[Stefan Beller]

When a submodule is deinit'd, the working tree is gone, so the setting of
core.worktree is bogus. Unset it. As we covered the only other case in
which a submodule loses its working tree in the earlier step
(i.e. switching branches of top-level project to move to a commit that did
not have the submodule), this makes the code always maintain
core.worktree correctly unset when there is no working tree
for a submodule.

This re-introduces 984cd77ddb (submodule deinit: unset core.worktree,
2018-06-18), which was reverted as part of f178c13fda (Revert "Merge
branch 'sb/submodule-core-worktree'", 2018-09-07)

The whole series was reverted as the offending commit e98317508c
(submodule: ensure core.worktree is set after update, 2018-06-18)
was relied on by other commits such as 984cd77ddb.

Keep the offending commit reverted, but its functionality came back via
4d6d6ef1fc (Merge branch 'sb/submodule-update-in-c', 2018-09-17), such
that we can reintroduce 984cd77ddb now.

Signed-off-by: Stefan Beller <sbel...@google.com>
---
 builtin/submodule--helper.c | 2 ++
 t/lib-submodule-update.sh   | 2 +-
 t/t7400-submodule-basic.sh  | 5 +++++
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index 31ac30cf2f..672b74db89 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -1131,6 +1131,8 @@ static void deinit_submodule(const char *path, const char 
*prefix,
                if (!(flags & OPT_QUIET))
                        printf(format, displaypath);
 
+               submodule_unset_core_worktree(sub);
+
                strbuf_release(&sb_rm);
        }
 
diff --git a/t/lib-submodule-update.sh b/t/lib-submodule-update.sh
index 51d4555549..5b56b23166 100755
--- a/t/lib-submodule-update.sh
+++ b/t/lib-submodule-update.sh
@@ -235,7 +235,7 @@ reset_work_tree_to_interested () {
        then
                mkdir -p submodule_update/.git/modules/sub1/modules &&
                cp -r submodule_update_repo/.git/modules/sub1/modules/sub2 
submodule_update/.git/modules/sub1/modules/sub2
-               GIT_WORK_TREE=. git -C 
submodule_update/.git/modules/sub1/modules/sub2 config --unset core.worktree
+               # core.worktree is unset for sub2 as it is not checked out
        fi &&
        # indicate we are interested in the submodule:
        git -C submodule_update config submodule.sub1.url "bogus" &&
diff --git a/t/t7400-submodule-basic.sh b/t/t7400-submodule-basic.sh
index 76a7cb0af7..aba2d4d6ee 100755
--- a/t/t7400-submodule-basic.sh
+++ b/t/t7400-submodule-basic.sh
@@ -984,6 +984,11 @@ test_expect_success 'submodule deinit should remove the 
whole submodule section
        rmdir init
 '
 
+test_expect_success 'submodule deinit should unset core.worktree' '
+       test_path_is_file .git/modules/example/config &&
+       test_must_fail git config -f .git/modules/example/config core.worktree
+'
+
 test_expect_success 'submodule deinit from subdirectory' '
        git submodule update --init &&
        git config submodule.example.foo bar &&
-- 
2.20.0.405.gbc1bbc6f85-goog