[PATCH v5 3/4] submodule: record superproject gitdir during absorbgitdirs

From

Emily Shaffer <emilyshaffer@google.com>

Date

Nov 4, 2021, 23:49 UTC

Message-ID

<20211104234942.3473650-4-emilyshaffer@google.com>

In-Reply-To

<20211104234942.3473650-1-emilyshaffer@google.com>

Signed-off-by: Emily Shaffer <emilyshaffer@google.com>
---
 submodule.c                        |  9 ++++++
 t/t7412-submodule-absorbgitdirs.sh | 50 ++++++++++++++++++++++++++++--
 2 files changed, 57 insertions(+), 2 deletions(-)

diff --git a/submodule.c b/submodule.c
index c689070524..2e54dcf1a2 100644
--- a/submodule.c
+++ b/submodule.c
@@ -2097,6 +2097,7 @@ static void relocate_single_git_dir_into_superproject(const char *path)
 	char *old_git_dir = NULL, *real_old_git_dir = NULL, *real_new_git_dir = NULL;
 	struct strbuf new_gitdir = STRBUF_INIT;
 	const struct submodule *sub;
+	struct strbuf config_path = STRBUF_INIT, sb = STRBUF_INIT;
 
 	if (submodule_uses_worktrees(path))
 		die(_("relocate_gitdir for submodule '%s' with "
@@ -2127,6 +2128,14 @@ static void relocate_single_git_dir_into_superproject(const char *path)
 
 	relocate_gitdir(path, real_old_git_dir, real_new_git_dir);
 
+	/* cache pointer to superproject's gitdir */
+	strbuf_addf(&config_path, "%s/config", real_new_git_dir);
+	git_config_set_in_file(config_path.buf, "submodule.superprojectGitdir",
+			       relative_path(absolute_path(get_git_common_dir()),
+					     real_new_git_dir, &sb));
+
+	strbuf_release(&config_path);
+	strbuf_release(&sb);
 	free(old_git_dir);
 	free(real_old_git_dir);
 	free(real_new_git_dir);
diff --git a/t/t7412-submodule-absorbgitdirs.sh b/t/t7412-submodule-absorbgitdirs.sh
index 1cfa150768..b6f229043d 100755
--- a/t/t7412-submodule-absorbgitdirs.sh
+++ b/t/t7412-submodule-absorbgitdirs.sh
@@ -30,7 +30,17 @@ test_expect_success 'absorb the git dir' '
 	git status >actual.1 &&
 	git -C sub1 rev-parse HEAD >actual.2 &&
 	test_cmp expect.1 actual.1 &&
-	test_cmp expect.2 actual.2
+	test_cmp expect.2 actual.2 &&
+
+	# make sure the submodule cached the superproject gitdir correctly
+	submodule_gitdir="$(git -C sub1 rev-parse --path-format=absolute --git-common-dir)" &&
+	superproject_gitdir="$(git rev-parse --path-format=absolute --git-common-dir)" &&
+
+	test-tool path-utils relative_path "$superproject_gitdir" \
+		"$submodule_gitdir" >expect &&
+	git -C sub1 config submodule.superprojectGitDir >actual &&
+
+	test_cmp expect actual
 '
 
 test_expect_success 'absorbing does not fail for deinitialized submodules' '
@@ -61,7 +71,16 @@ test_expect_success 'absorb the git dir in a nested submodule' '
 	git status >actual.1 &&
 	git -C sub1/nested rev-parse HEAD >actual.2 &&
 	test_cmp expect.1 actual.1 &&
-	test_cmp expect.2 actual.2
+	test_cmp expect.2 actual.2 &&
+
+	sub1_gitdir="$(git -C sub1 rev-parse --path-format=absolute --git-common-dir)" &&
+	sub1_nested_gitdir="$(git -C sub1/nested rev-parse --path-format=absolute --git-common-dir)" &&
+
+	test-tool path-utils relative_path "$sub1_gitdir" "$sub1_nested_gitdir" \
+		>expect &&
+	git -C sub1/nested config submodule.superprojectGitDir >actual &&
+
+	test_cmp expect actual
 '
 
 test_expect_success 're-setup nested submodule' '
@@ -130,4 +149,31 @@ test_expect_success 'absorbing fails for a submodule with multiple worktrees' '
 	test_i18ngrep "not supported" error
 '
 
+test_expect_success 'absorbgitdirs works when called from a superproject worktree' '
+	# set up a worktree of the superproject
+	git worktree add wt &&
+	(
+	cd wt &&
+
+	# create a new unembedded git dir
+	git init sub4 &&
+	test_commit -C sub4 first &&
+	git submodule add ./sub4 &&
+	test_tick &&
+
+	# absorb the git dir
+	git submodule absorbgitdirs sub4 &&
+
+	# make sure the submodule cached the superproject gitdir correctly
+	submodule_gitdir="$(git -C sub4 rev-parse --path-format=absolute --git-common-dir)" &&
+	superproject_gitdir="$(git rev-parse --path-format=absolute --git-common-dir)" &&
+
+	test-tool path-utils relative_path "$superproject_gitdir" \
+		"$submodule_gitdir" >expect &&
+	git -C sub4 config submodule.superprojectGitDir >actual &&
+
+	test_cmp expect actual
+	)
+'
+
 test_done

-- 
2.34.0.rc0.344.g81b53c2807-goog