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From: "Philippe Blain via GitGitGadget" <gitgitgadget@gmail.com>
To: git@vger.kernel.org
Cc: Philippe Blain <levraiphilippeblain@gmail.com>,
	Philippe Blain <levraiphilippeblain@gmail.com>
Subject: [PATCH v2 4/4] submodule.c: use get_git_dir() instead of get_git_common_dir()
Date: Tue, 21 Jan 2020 15:01:17 +0000
Message-ID: <614bccd31b8edb6cf7c0ae53b70680e0a18bdd7e.1579618877.git.gitgitgadget@gmail.com> (raw)
In-Reply-To: <pull.523.v2.git.1579618877.gitgitgadget@gmail.com>

From: Philippe Blain <levraiphilippeblain@gmail.com>

Ever since df56607dff (git-common-dir: make "modules/"
per-working-directory directory, 2014-11-30), submodules in linked worktrees
are cloned to $GIT_DIR/modules, i.e. $GIT_COMMON_DIR/worktrees/<name>/modules.

However, this convention was not followed when the worktree updater commands
checkout, reset and read-tree learned to recurse into submodules. Specifically,
submodule.c::submodule_move_head, introduced in 6e3c1595c6 (update submodules:
add submodule_move_head, 2017-03-14) and submodule.c::submodule_unset_core_worktree,
(re)introduced in 898c2e65b7 (submodule: unset core.worktree if no working tree
is present, 2018-12-14) use get_git_common_dir() instead of get_git_dir()
to get the path of the submodule repository.

This means that, for example, 'git checkout --recurse-submodules <branch>'
in a linked worktree will correctly checkout <branch>, detach the submodule's HEAD
at the commit recorded in <branch> and update the submodule working tree, but the
submodule HEAD that will be moved is the one in $GIT_COMMON_DIR/modules/<name>/,
i.e. the submodule repository of the main superproject working tree.
It will also rewrite the gitfile in the submodule working tree of the linked worktree
to point to $GIT_COMMON_DIR/modules/<name>/.
This leads to an incorrect (and confusing!) state in the submodule working tree
of the main superproject worktree.

Additionally, if switching to a commit where the submodule is not present,
submodule_unset_core_worktree will be called and will incorrectly remove
'core.wortree' from the config file of the submodule in the main superproject worktree,
$GIT_COMMON_DIR/modules/<name>/config.

Fix this by constructing the path to the submodule repository using get_git_dir()
in both submodule_move_head and submodule_unset_core_worktree.

Signed-off-by: Philippe Blain <levraiphilippeblain@gmail.com>
---
 submodule.c                   |  6 +++---
 t/t2405-worktree-submodule.sh | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+), 3 deletions(-)

diff --git a/submodule.c b/submodule.c
index 9da7181321..5d19ec48a6 100644
--- a/submodule.c
+++ b/submodule.c
@@ -1811,7 +1811,7 @@ int bad_to_remove_submodule(const char *path, unsigned flags)
 void submodule_unset_core_worktree(const struct submodule *sub)
 {
 	char *config_path = xstrfmt("%s/modules/%s/config",
-				    get_git_common_dir(), sub->name);
+				    get_git_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'"),
@@ -1914,7 +1914,7 @@ int submodule_move_head(const char *path,
 					ABSORB_GITDIR_RECURSE_SUBMODULES);
 		} else {
 			char *gitdir = xstrfmt("%s/modules/%s",
-				    get_git_common_dir(), sub->name);
+				    get_git_dir(), sub->name);
 			connect_work_tree_and_git_dir(path, gitdir, 0);
 			free(gitdir);
 
@@ -1924,7 +1924,7 @@ int submodule_move_head(const char *path,
 
 		if (old_head && (flags & SUBMODULE_MOVE_HEAD_FORCE)) {
 			char *gitdir = xstrfmt("%s/modules/%s",
-				    get_git_common_dir(), sub->name);
+				    get_git_dir(), sub->name);
 			connect_work_tree_and_git_dir(path, gitdir, 1);
 			free(gitdir);
 		}
diff --git a/t/t2405-worktree-submodule.sh b/t/t2405-worktree-submodule.sh
index d0830058fd..e1b2bfd87e 100755
--- a/t/t2405-worktree-submodule.sh
+++ b/t/t2405-worktree-submodule.sh
@@ -10,6 +10,7 @@ test_expect_success 'setup: create origin repos'  '
 	git init origin/sub &&
 	test_commit -C origin/sub file1 &&
 	git init origin/main &&
+	test_commit -C origin/main first &&
 	git -C origin/main submodule add ../sub &&
 	git -C origin/main commit -m "add sub" &&
 	test_commit -C origin/sub "file1 updated" file1 file1updated file1updated &&
@@ -54,4 +55,36 @@ test_expect_success 'submodule is checked out after manually adding submodule wo
 	grep "file1 updated" out
 '
 
+test_expect_success 'checkout --recurse-submodules uses $GIT_DIR for submodules in a linked worktree' '
+	git -C main worktree add "$base_path/checkout-recurse" --detach  &&
+	git -C checkout-recurse submodule update --init &&
+	echo "gitdir: ../../main/.git/worktrees/checkout-recurse/modules/sub" >expect-gitfile &&
+	cat checkout-recurse/sub/.git >actual-gitfile &&
+	test_cmp expect-gitfile actual-gitfile &&
+	git -C main/sub rev-parse HEAD >expect-head-main &&
+	git -C checkout-recurse checkout --recurse-submodules HEAD~1 &&
+	cat checkout-recurse/sub/.git >actual-gitfile &&
+	git -C main/sub rev-parse HEAD >actual-head-main &&
+	test_cmp expect-gitfile actual-gitfile &&
+	test_cmp expect-head-main actual-head-main
+'
+
+test_expect_success 'core.worktree is removed in $GIT_DIR/modules/<name>/config, not in $GIT_COMMON_DIR/modules/<name>/config' '
+	echo "../../../sub" >expect-main &&
+	git -C main/sub config --get core.worktree >actual-main &&
+	test_cmp expect-main actual-main &&
+	echo "../../../../../../checkout-recurse/sub" >expect-linked &&
+	git -C checkout-recurse/sub config --get core.worktree >actual-linked &&
+	test_cmp expect-linked actual-linked &&
+	git -C checkout-recurse checkout --recurse-submodules first &&
+	test_expect_code 1 git -C main/.git/worktrees/checkout-recurse/modules/sub config --get core.worktree >linked-config &&
+	test_must_be_empty linked-config &&
+	git -C main/sub config --get core.worktree >actual-main &&
+	test_cmp expect-main actual-main
+'
+
+test_expect_success 'unsetting core.worktree does not prevent running commands directly against the submodule repository' '
+	git -C main/.git/worktrees/checkout-recurse/modules/sub log
+'
+
 test_done
-- 
gitgitgadget

  parent reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-17 12:23 [PATCH 0/4] checkout/reset/read-tree: fix --recurse-submodules in linked worktree Philippe Blain via GitGitGadget
2020-01-17 12:23 ` [PATCH 1/4] t7410: rename to t2405-worktree-submodule.sh Philippe Blain via GitGitGadget
2020-01-17 12:23 ` [PATCH 2/4] t2405: use git -C and test_commit -C instead of subshells Philippe Blain via GitGitGadget
2020-01-17 13:45   ` Eric Sunshine
2020-01-17 20:32     ` Junio C Hamano
2020-01-18 19:50     ` Philippe Blain
2020-01-17 12:23 ` [PATCH 3/4] t2405: clarify test descriptions and simplify test Philippe Blain via GitGitGadget
2020-01-17 13:56   ` Eric Sunshine
2020-01-19  0:21     ` Philippe Blain
2020-01-19  1:41       ` Eric Sunshine
2020-01-17 12:23 ` [PATCH 4/4] submodule.c: use get_git_dir() instead of get_git_common_dir() Philippe Blain via GitGitGadget
2020-01-17 13:24   ` Derrick Stolee
2020-01-18 21:09     ` Philippe Blain
2020-01-17 13:24 ` [PATCH 0/4] checkout/reset/read-tree: fix --recurse-submodules in linked worktree Derrick Stolee
2020-01-21 15:01 ` [PATCH v2 " Philippe Blain via GitGitGadget
2020-01-21 15:01   ` [PATCH v2 1/4] t7410: rename to t2405-worktree-submodule.sh Philippe Blain via GitGitGadget
2020-01-21 15:01   ` [PATCH v2 2/4] t2405: use git -C and test_commit -C instead of subshells Philippe Blain via GitGitGadget
2020-01-21 15:01   ` [PATCH v2 3/4] t2405: clarify test descriptions and simplify test Philippe Blain via GitGitGadget
2020-01-21 15:01   ` Philippe Blain via GitGitGadget [this message]
2020-01-22 12:55   ` [PATCH v2 0/4] checkout/reset/read-tree: fix --recurse-submodules in linked worktree Philippe Blain
2020-01-22 22:10   ` Junio C Hamano
2020-01-22 22:25     ` Philippe Blain
2020-01-24 23:00       ` Philippe Blain
2020-01-24 23:47         ` Junio C Hamano

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