[PATCH 5/9] setup: limit get_git_work_tree()'s to explicit setup case only

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

get_git_work_tree() takes input as core.worktree, core.bare,
GIT_WORK_TREE and decides correct worktree setting.

Unfortunately it does not do its job well. core.worktree and
GIT_WORK_TREE should only be taken into account, if GIT_DIR is set
(which is handled by setup_explicit_git_dir). For other setup cases,
only core.bare matters.

Add a temporary variable setup_explicit to adjust get_git_work_tree()
behavior as such. This variable will be gone once setup_* rework is
done.

Also remove is_bare_repository_cfg check in set_git_work_tree() to
ease the rework. We are going to check for core.bare and core.worktree
early before setting worktree. For example, if core.bare is true, no
need to set worktree.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 I isolate setup_bare_git_dir and setup_discovered_git_dir from
 get_git_work_tree() with this patch. setup_explicit_git_dir will
 remove "startup_info->setup_explicit = 1", which means
 get_git_work_tree() can no longer affect setup_* even if all the
 logic is there.

 builtin/init-db.c     |    1 +
 cache.h               |    1 +
 environment.c         |   10 ++++++-
 setup.c               |   10 ++++++-
 t/t1510-repo-setup.sh |   66 ++++++++++++++++++++++++------------------------
 5 files changed, 51 insertions(+), 37 deletions(-)

diff --git a/builtin/init-db.c b/builtin/init-db.c
index 9d4886c..ea06478 100644
--- a/builtin/init-db.c
+++ b/builtin/init-db.c
@@ -496,6 +496,7 @@ int cmd_init_db(int argc, const char **argv, const char *prefix)
 	if (is_bare_repository_cfg < 0)
 		is_bare_repository_cfg = guess_repository_type(git_dir);
 
+	startup_info->setup_explicit = 1;
 	if (!is_bare_repository_cfg) {
 		if (git_dir) {
 			const char *git_dir_parent = strrchr(git_dir, '/');
diff --git a/cache.h b/cache.h
index 123dd4b..b2cdda7 100644
--- a/cache.h
+++ b/cache.h
@@ -1119,6 +1119,7 @@ const char *split_cmdline_strerror(int cmdline_errno);
 /* git.c */
 struct startup_info {
 	int have_repository;
+	int setup_explicit;
 };
 extern struct startup_info *startup_info;
 
diff --git a/environment.c b/environment.c
index de5581f..d811049 100644
--- a/environment.c
+++ b/environment.c
@@ -137,8 +137,6 @@ static int git_work_tree_initialized;
  */
 void set_git_work_tree(const char *new_work_tree)
 {
-	if (is_bare_repository_cfg >= 0)
-		die("cannot set work tree after initialization");
 	git_work_tree_initialized = 1;
 	free(work_tree);
 	work_tree = xstrdup(make_absolute_path(new_work_tree));
@@ -147,6 +145,14 @@ void set_git_work_tree(const char *new_work_tree)
 
 const char *get_git_work_tree(void)
 {
+	if (startup_info && !startup_info->setup_explicit) {
+		if (is_bare_repository_cfg == 1)
+			return NULL;
+		if (work_tree)
+			is_bare_repository_cfg = 0;
+		return work_tree;
+	}
+
 	if (!git_work_tree_initialized) {
 		work_tree = getenv(GIT_WORK_TREE_ENVIRONMENT);
 		/* core.bare = true overrides implicit and config work tree */
diff --git a/setup.c b/setup.c
index 49a1a25..c7d7198 100644
--- a/setup.c
+++ b/setup.c
@@ -331,6 +331,8 @@ static const char *setup_explicit_git_dir(const char *gitdirenv,
 	static char buffer[1024 + 1];
 	const char *retval;
 
+	if (startup_info)
+		startup_info->setup_explicit = 1;
 	if (PATH_MAX - 40 < strlen(gitdirenv))
 		die("'$%s' too big", GIT_DIR_ENVIRONMENT);
 	if (!is_git_directory(gitdirenv)) {
@@ -382,12 +384,15 @@ static const char *setup_discovered_git_dir(const char *work_tree_env,
 					    char *cwd, int *nongit_ok)
 {
 	int root_len;
+	char *work_tree;
 
 	inside_git_dir = 0;
 	if (!work_tree_env)
 		inside_work_tree = 1;
 	root_len = offset_1st_component(cwd);
-	git_work_tree_cfg = xstrndup(cwd, offset > root_len ? offset : root_len);
+	work_tree = xstrndup(cwd, offset > root_len ? offset : root_len);
+	set_git_work_tree(work_tree);
+	free(work_tree);
 	if (check_repository_format_gently(gitdir, nongit_ok))
 		return NULL;
 	if (offset == len)
@@ -627,7 +632,8 @@ const char *setup_git_directory(void)
 	const char *retval = setup_git_directory_gently(NULL);
 
 	/* If the work tree is not the default one, recompute prefix */
-	if (inside_work_tree < 0) {
+	if ((!startup_info || startup_info->setup_explicit) &&
+	    inside_work_tree < 0) {
 		static char buffer[PATH_MAX + 1];
 		char *rel;
 		if (retval && chdir(retval))
diff --git a/t/t1510-repo-setup.sh b/t/t1510-repo-setup.sh
index fe65a02..629ba34 100755
--- a/t/t1510-repo-setup.sh
+++ b/t/t1510-repo-setup.sh
@@ -129,7 +129,7 @@ test_expect_success '#1: setup' '
 	cd ..
 '
 
-test_expect_failure '#1: at root' '
+test_expect_success '#1: at root' '
 	cat >1/expected <<EOF &&
 setup: git_dir: .git
 setup: worktree: $TRASH_DIRECTORY/1
@@ -139,7 +139,7 @@ EOF
 	test_repo 1
 '
 
-test_expect_failure '#1: in subdir' '
+test_expect_success '#1: in subdir' '
 	cat >1/sub/expected <<EOF &&
 setup: git_dir: .git
 setup: worktree: $TRASH_DIRECTORY/1
@@ -509,7 +509,7 @@ test_expect_success '#4: setup' '
 	cd ..
 '
 
-test_expect_failure '#4: at root' '
+test_expect_success '#4: at root' '
 	cat >4/expected <<EOF &&
 setup: git_dir: .git
 setup: worktree: $TRASH_DIRECTORY/4
@@ -519,7 +519,7 @@ EOF
 	test_repo 4
 '
 
-test_expect_failure '#4: in subdir' '
+test_expect_success '#4: in subdir' '
 	cat >4/sub/expected <<EOF &&
 setup: git_dir: .git
 setup: worktree: $TRASH_DIRECTORY/4
@@ -556,7 +556,7 @@ test_expect_success '#5: setup' '
 	cd ..
 '
 
-test_expect_failure '#5: at root' '
+test_expect_success '#5: at root' '
 	cat >5/expected <<EOF &&
 setup: git_dir: .git
 setup: worktree: $TRASH_DIRECTORY/5
@@ -566,7 +566,7 @@ EOF
 	test_repo 5
 '
 
-test_expect_failure '#5: in subdir' '
+test_expect_success '#5: in subdir' '
 	cat >5/sub/expected <<EOF &&
 setup: git_dir: .git
 setup: worktree: $TRASH_DIRECTORY/5
@@ -1207,7 +1207,7 @@ test_expect_success '#9: setup' '
 	cd ..
 '
 
-test_expect_failure '#9: at root' '
+test_expect_success '#9: at root' '
 	cat >9/expected <<EOF &&
 setup: git_dir: $TRASH_DIRECTORY/9.git
 setup: worktree: $TRASH_DIRECTORY/9
@@ -1217,7 +1217,7 @@ EOF
 	GIT_WORK_TREE=non-existent test_repo 9
 '
 
-test_expect_failure '#9: in subdir' '
+test_expect_success '#9: in subdir' '
 	cat >9/sub/expected <<EOF &&
 setup: git_dir: $TRASH_DIRECTORY/9.git
 setup: worktree: $TRASH_DIRECTORY/9
@@ -1590,7 +1590,7 @@ test_expect_success '#12: setup' '
 	cd ..
 '
 
-test_expect_failure '#12: at root' '
+test_expect_success '#12: at root' '
 	cat >12/expected <<EOF &&
 setup: git_dir: $TRASH_DIRECTORY/12.git
 setup: worktree: $TRASH_DIRECTORY/12
@@ -1600,7 +1600,7 @@ EOF
 	test_repo 12
 '
 
-test_expect_failure '#12: in subdir' '
+test_expect_success '#12: in subdir' '
 	cat >12/sub/expected <<EOF &&
 setup: git_dir: $TRASH_DIRECTORY/12.git
 setup: worktree: $TRASH_DIRECTORY/12
@@ -1639,7 +1639,7 @@ test_expect_success '#13: setup' '
 	cd ..
 '
 
-test_expect_failure '#13: at root' '
+test_expect_success '#13: at root' '
 	cat >13/expected <<EOF &&
 setup: git_dir: $TRASH_DIRECTORY/13.git
 setup: worktree: $TRASH_DIRECTORY/13
@@ -1649,7 +1649,7 @@ EOF
 	test_repo 13
 '
 
-test_expect_failure '#13: in subdir' '
+test_expect_success '#13: in subdir' '
 	cat >13/sub/expected <<EOF &&
 setup: git_dir: $TRASH_DIRECTORY/13.git
 setup: worktree: $TRASH_DIRECTORY/13
@@ -2380,7 +2380,7 @@ test_expect_success '#17.1: setup' '
 	cd ..
 '
 
-test_expect_failure '#17.1: at .git' '
+test_expect_success '#17.1: at .git' '
 	cat >17/.git/expected <<EOF &&
 setup: git_dir: .
 setup: worktree: (null)
@@ -2390,7 +2390,7 @@ EOF
 	test_repo 17/.git
 '
 
-test_expect_failure '#17.1: in .git/wt' '
+test_expect_success '#17.1: in .git/wt' '
 	cat >17/.git/wt/expected <<EOF &&
 setup: git_dir: $TRASH_DIRECTORY/17/.git
 setup: worktree: (null)
@@ -2400,7 +2400,7 @@ EOF
 	test_repo 17/.git/wt
 '
 
-test_expect_failure '#17.1: in .git/wt/sub' '
+test_expect_success '#17.1: in .git/wt/sub' '
 	cat >17/.git/wt/sub/expected <<EOF &&
 setup: git_dir: $TRASH_DIRECTORY/17/.git
 setup: worktree: (null)
@@ -2431,7 +2431,7 @@ test_expect_success '#17.2: setup' '
 	git config --file="$TRASH_DIRECTORY/17/.git/config" core.bare true
 '
 
-test_expect_failure '#17.2: at .git' '
+test_expect_success '#17.2: at .git' '
 	cat >17/.git/expected <<EOF &&
 setup: git_dir: .
 setup: worktree: (null)
@@ -2441,7 +2441,7 @@ EOF
 	test_repo 17/.git
 '
 
-test_expect_failure '#17.2: in .git/wt' '
+test_expect_success '#17.2: in .git/wt' '
 	cat >17/.git/wt/expected <<EOF &&
 setup: git_dir: $TRASH_DIRECTORY/17/.git
 setup: worktree: (null)
@@ -2451,7 +2451,7 @@ EOF
 	test_repo 17/.git/wt
 '
 
-test_expect_failure '#17.2: in .git/wt/sub' '
+test_expect_success '#17.2: in .git/wt/sub' '
 	cat >17/.git/wt/sub/expected <<EOF &&
 setup: git_dir: $TRASH_DIRECTORY/17/.git
 setup: worktree: (null)
@@ -2461,7 +2461,7 @@ EOF
 	test_repo 17/.git/wt/sub
 '
 
-test_expect_failure '#17.2: at root' '
+test_expect_success '#17.2: at root' '
 	cat >17/expected <<EOF &&
 setup: git_dir: .git
 setup: worktree: (null)
@@ -2845,7 +2845,7 @@ test_expect_success '#20.1: setup' '
 	cd ..
 '
 
-test_expect_failure '#20.1: at .git' '
+test_expect_success '#20.1: at .git' '
 	cat >20/.git/expected <<EOF &&
 setup: git_dir: .
 setup: worktree: (null)
@@ -2855,7 +2855,7 @@ EOF
 	test_repo 20/.git
 '
 
-test_expect_failure '#20.1: in .git/wt' '
+test_expect_success '#20.1: in .git/wt' '
 	cat >20/.git/wt/expected <<EOF &&
 setup: git_dir: $TRASH_DIRECTORY/20/.git
 setup: worktree: (null)
@@ -2865,7 +2865,7 @@ EOF
 	test_repo 20/.git/wt
 '
 
-test_expect_failure '#20.1: in .git/wt/sub' '
+test_expect_success '#20.1: in .git/wt/sub' '
 	cat >20/.git/wt/sub/expected <<EOF &&
 setup: git_dir: $TRASH_DIRECTORY/20/.git
 setup: worktree: (null)
@@ -2974,7 +2974,7 @@ test_expect_success '#21.1: setup' '
 	cd ..
 '
 
-test_expect_failure '#21.1: at .git' '
+test_expect_success '#21.1: at .git' '
 	cat >21/.git/expected <<EOF &&
 setup: git_dir: .
 setup: worktree: (null)
@@ -2984,7 +2984,7 @@ EOF
 	test_repo 21/.git
 '
 
-test_expect_failure '#21.1: in .git/wt' '
+test_expect_success '#21.1: in .git/wt' '
 	cat >21/.git/wt/expected <<EOF &&
 setup: git_dir: $TRASH_DIRECTORY/21/.git
 setup: worktree: (null)
@@ -2994,7 +2994,7 @@ EOF
 	test_repo 21/.git/wt
 '
 
-test_expect_failure '#21.1: in .git/wt/sub' '
+test_expect_success '#21.1: in .git/wt/sub' '
 	cat >21/.git/wt/sub/expected <<EOF &&
 setup: git_dir: $TRASH_DIRECTORY/21/.git
 setup: worktree: (null)
@@ -3025,7 +3025,7 @@ test_expect_success '#21.2: setup' '
 	git config --file="$TRASH_DIRECTORY/21/.git/config" core.bare true
 '
 
-test_expect_failure '#21.2: at .git' '
+test_expect_success '#21.2: at .git' '
 	cat >21/.git/expected <<EOF &&
 setup: git_dir: .
 setup: worktree: (null)
@@ -3035,7 +3035,7 @@ EOF
 	test_repo 21/.git
 '
 
-test_expect_failure '#21.2: in .git/wt' '
+test_expect_success '#21.2: in .git/wt' '
 	cat >21/.git/wt/expected <<EOF &&
 setup: git_dir: $TRASH_DIRECTORY/21/.git
 setup: worktree: (null)
@@ -3045,7 +3045,7 @@ EOF
 	test_repo 21/.git/wt
 '
 
-test_expect_failure '#21.2: in .git/wt/sub' '
+test_expect_success '#21.2: in .git/wt/sub' '
 	cat >21/.git/wt/sub/expected <<EOF &&
 setup: git_dir: $TRASH_DIRECTORY/21/.git
 setup: worktree: (null)
@@ -3055,7 +3055,7 @@ EOF
 	test_repo 21/.git/wt/sub
 '
 
-test_expect_failure '#21.2: at root' '
+test_expect_success '#21.2: at root' '
 	cat >21/expected <<EOF &&
 setup: git_dir: .git
 setup: worktree: (null)
@@ -3703,7 +3703,7 @@ test_expect_success '#24: setup' '
 	cd ..
 '
 
-test_expect_success '#24: at root' '
+test_expect_failure '#24: at root' '
 	cat >24/expected <<EOF &&
 setup: git_dir: $TRASH_DIRECTORY/24.git
 setup: worktree: (null)
@@ -3713,7 +3713,7 @@ EOF
 	test_repo 24
 '
 
-test_expect_success '#24: in subdir' '
+test_expect_failure '#24: in subdir' '
 	cat >24/sub/expected <<EOF &&
 setup: git_dir: $TRASH_DIRECTORY/24.git
 setup: worktree: (null)
@@ -4137,7 +4137,7 @@ test_expect_success '#28: setup' '
 	cd ..
 '
 
-test_expect_success '#28: at root' '
+test_expect_failure '#28: at root' '
 	cat >28/expected <<EOF &&
 setup: git_dir: $TRASH_DIRECTORY/28.git
 setup: worktree: (null)
@@ -4147,7 +4147,7 @@ EOF
 	test_repo 28
 '
 
-test_expect_success '#28: in subdir' '
+test_expect_failure '#28: in subdir' '
 	cat >28/sub/expected <<EOF &&
 setup: git_dir: $TRASH_DIRECTORY/28.git
 setup: worktree: (null)
-- 
1.7.3.2.210.g045198