This reintroduces 4fa4f90ccd (submodule: unset core.worktree if no working
tree is present, 2018-06-12), which was reverted as part of f178c13fda
(Revert "Merge branch 'sb/submodule-core-worktree'", 2018-09-07).

4fa4f90ccd was reverted as its followup commit was faulty, but without
the accompanying change of the followup, we'd have an incomplete workflow
of setting `core.worktree` again, when it is needed such as checking out
a revision that contains a submodule.

So re-introduce that commit as-is, focusing on fixing up the followup

Signed-off-by: Stefan Beller <sbel...@google.com>
Signed-off-by: Junio C Hamano <gits...@pobox.com>
Signed-off-by: Stefan Beller <sbel...@google.com>
---
 submodule.c               | 14 ++++++++++++++
 submodule.h               |  2 ++
 t/lib-submodule-update.sh |  3 ++-
 3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/submodule.c b/submodule.c
index 6415cc5580..d393e947e6 100644
--- a/submodule.c
+++ b/submodule.c
@@ -1561,6 +1561,18 @@ int bad_to_remove_submodule(const char *path, unsigned 
flags)
        return ret;
 }
 
+void submodule_unset_core_worktree(const struct submodule *sub)
+{
+       char *config_path = xstrfmt("%s/modules/%s/config",
+                                   get_git_common_dir(), sub->name);
+
+       if (git_config_set_in_file_gently(config_path, "core.worktree", NULL))
+               warning(_("Could not unset core.worktree setting in submodule 
'%s'"),
+                         sub->path);
+
+       free(config_path);
+}
+
 static const char *get_super_prefix_or_empty(void)
 {
        const char *s = get_super_prefix();
@@ -1726,6 +1738,8 @@ int submodule_move_head(const char *path,
 
                        if (is_empty_dir(path))
                                rmdir_or_warn(path);
+
+                       submodule_unset_core_worktree(sub);
                }
        }
 out:
diff --git a/submodule.h b/submodule.h
index a680214c01..9e18e9b807 100644
--- a/submodule.h
+++ b/submodule.h
@@ -131,6 +131,8 @@ int submodule_move_head(const char *path,
                        const char *new_head,
                        unsigned flags);
 
+void submodule_unset_core_worktree(const struct submodule *sub);
+
 /*
  * Prepare the "env_array" parameter of a "struct child_process" for executing
  * a submodule by clearing any repo-specific environment variables, but
diff --git a/t/lib-submodule-update.sh b/t/lib-submodule-update.sh
index 016391723c..51d4555549 100755
--- a/t/lib-submodule-update.sh
+++ b/t/lib-submodule-update.sh
@@ -709,7 +709,8 @@ test_submodule_recursing_with_args_common() {
                        git branch -t remove_sub1 origin/remove_sub1 &&
                        $command remove_sub1 &&
                        test_superproject_content origin/remove_sub1 &&
-                       ! test -e sub1
+                       ! test -e sub1 &&
+                       test_must_fail git config -f .git/modules/sub1/config 
core.worktree
                )
        '
        # ... absorbing a .git directory along the way.
-- 
2.20.0.rc2.403.gdbc3b29805-goog

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