Re: [PATCH 2/4] submodule: unset core.worktree if no working tree is present

> 2018-09-07). The revert was needed as the nearby commit e98317508c
> (submodule: ensure core.worktree is set after update, 2018-06-18) is
> faulty and at the time of 7e25437d35 (Merge branch
> 'sb/submodule-core-worktree', 2018-07-18) we could not revert the faulty
> commit only, as they were depending on each other: If core.worktree is
> unset, we have to have ways to ensure that it is set again once
> the working tree reappears again.
>
> Now that 4d6d6ef1fc (Merge branch 'sb/submodule-update-in-c', 2018-09-17),
> specifically 74d4731da1 (submodule--helper: replace
> connect-gitdir-workingtree by ensure-core-worktree, 2018-08-13) is
> present, we already check and ensure core.worktree is set when
> populating a new work tree, such that we can re-introduce the commits
> that unset core.worktree when removing the worktree.

> Signed-off-by: Stefan Beller <sbeller@google.com>
> Signed-off-by: Junio C Hamano <gitster@pobox.com>
> Signed-off-by: Stefan Beller <sbeller@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.