Merge branch 'pw/no-more-NULL-means-current-worktree' into jch

API clean-up for the worktree subsystem.

* pw/no-more-NULL-means-current-worktree:
  path: remove repository argument from worktree_git_path()
  wt-status: avoid passing NULL worktree

builtin/fsck.c

@@ -1105,7 +1105,7 @@ int cmd_fsck(int argc,
 			 * and may get overwritten by other calls
 			 * while we're examining the index.
 			 */
-			path = xstrdup(worktree_git_path(the_repository, wt, "index"));
+			path = xstrdup(worktree_git_path(wt, "index"));
 			wt_gitdir = get_worktree_git_dir(wt);
 
 			read_index_from(&istate, path, wt_gitdir);

builtin/worktree.c

@@ -1225,14 +1225,14 @@ static void validate_no_submodules(const struct worktree *wt)
 
 	wt_gitdir = get_worktree_git_dir(wt);
 
-	if (is_directory(worktree_git_path(the_repository, wt, "modules"))) {
+	if (is_directory(worktree_git_path(wt, "modules"))) {
 		/*
 		 * There could be false positives, e.g. the "modules"
 		 * directory exists but is empty. But it's a rare case and
 		 * this simpler check is probably good enough for now.
 		 */
 		found_submodules = 1;
-	} else if (read_index_from(&istate, worktree_git_path(the_repository, wt, "index"),
+	} else if (read_index_from(&istate, worktree_git_path(wt, "index"),
 				   wt_gitdir) > 0) {
 		for (i = 0; i < istate.cache_nr; i++) {
 			struct cache_entry *ce = istate.cache[i];

path.c

@@ -486,17 +486,16 @@ const char *mkpath(const char *fmt, ...)
 	return cleanup_path(pathname->buf);
 }
 
-const char *worktree_git_path(struct repository *r,
-			      const struct worktree *wt, const char *fmt, ...)
+const char *worktree_git_path(const struct worktree *wt, const char *fmt, ...)
 {
 	struct strbuf *pathname = get_pathname();
 	va_list args;
 
-	if (wt && wt->repo != r)
-		BUG("worktree not connected to expected repository");
+	if (!wt)
+		BUG("%s() called with NULL worktree", __func__);
 
 	va_start(args, fmt);
-	repo_git_pathv(r, wt, pathname, fmt, args);
+	repo_git_pathv(wt->repo, wt, pathname, fmt, args);
 	va_end(args);
 	return pathname->buf;
 }

path.h

@@ -66,13 +66,11 @@ const char *repo_git_path_replace(struct repository *repo,
 
 /*
  * Similar to repo_git_path() but can produce paths for a specified
- * worktree instead of current one. When no worktree is given, then the path is
- * computed relative to main worktree of the given repository.
+ * worktree instead of current one.
  */
-const char *worktree_git_path(struct repository *r,
-			      const struct worktree *wt,
+const char *worktree_git_path(const struct worktree *wt,
 			      const char *fmt, ...)
-	__attribute__((format (printf, 3, 4)));
+	__attribute__((format (printf, 2, 3)));
 
 /*
  * The `repo_worktree_path` family of functions will construct a path into a

revision.c

@@ -1848,7 +1848,7 @@ void add_index_objects_to_pending(struct rev_info *revs, unsigned int flags)
 		wt_gitdir = get_worktree_git_dir(wt);
 
 		if (read_index_from(&istate,
-				    worktree_git_path(the_repository, wt, "index"),
+				    worktree_git_path(wt, "index"),
 				    wt_gitdir) > 0)
 			do_add_index_objects_to_pending(revs, &istate, flags);
 

t/t7512-status-help.sh

@@ -594,6 +594,15 @@ EOF
 	test_cmp expected actual
 '
 
+test_expect_success 'rebase in a linked worktree' '
+	test_might_fail git rebase --abort &&
+	git worktree add wt &&
+	test_when_finished "test_might_fail git -C wt rebase --abort;
+				git worktree remove wt" &&
+	GIT_SEQUENCE_EDITOR="echo break >" git -C wt rebase -i HEAD &&
+	git -C wt status >actual &&
+	test_grep "interactive rebase in progress" actual
+'
 
 test_expect_success 'prepare am_session' '
 	git reset --hard main &&

worktree.c

@@ -66,6 +66,26 @@ static int is_current_worktree(struct worktree *wt)
 	return is_current;
 }
 
+struct worktree *get_worktree_from_repository(struct repository *repo)
+{
+	struct worktree *wt = xcalloc(1, sizeof(*wt));
+	char *gitdir = absolute_pathdup(repo->gitdir);
+	char *commondir = absolute_pathdup(repo->commondir);
+
+	wt->repo = repo;
+	wt->path = absolute_pathdup(repo->worktree ? repo->worktree
+						   : repo->gitdir);
+	wt->is_bare = !repo->worktree;
+	if (fspathcmp(gitdir, commondir))
+		wt->id = xstrdup(find_last_dir_sep(gitdir) + 1);
+	wt->is_current = is_current_worktree(wt);
+	add_head_info(wt);
+
+	free(gitdir);
+	free(commondir);
+	return wt;
+}
+
 /*
 * When in a secondary worktree, and when extensions.worktreeConfig
 * is true, only $commondir/config and $commondir/worktrees/<id>/
@@ -288,7 +308,7 @@ const char *worktree_lock_reason(struct worktree *wt)
 	if (!wt->lock_reason_valid) {
 		struct strbuf path = STRBUF_INIT;
 
-		strbuf_addstr(&path, worktree_git_path(the_repository, wt, "locked"));
+		strbuf_addstr(&path, worktree_git_path(wt, "locked"));
 		if (file_exists(path.buf)) {
 			struct strbuf lock_reason = STRBUF_INIT;
 			if (strbuf_read_file(&lock_reason, path.buf, 0) < 0)

worktree.h

@@ -38,6 +38,12 @@ struct worktree **get_worktrees(void);
  */
 struct worktree **get_worktrees_without_reading_head(void);
 
+/*
+ * Construct a struct worktree corresponding to repo->gitdir and
+ * repo->worktree.
+ */
+struct worktree *get_worktree_from_repository(struct repository *repo);
+
 /*
  * Returns 1 if linked worktrees exist, 0 otherwise.
  */

wt-status.c

@@ -1648,7 +1648,7 @@ static char *get_branch(const struct worktree *wt, const char *path)
 	struct object_id oid;
 	const char *branch_name;
 
-	if (strbuf_read_file(&sb, worktree_git_path(the_repository, wt, "%s", path), 0) <= 0)
+	if (strbuf_read_file(&sb, worktree_git_path(wt, "%s", path), 0) <= 0)
 		goto got_nothing;
 
 	while (sb.len && sb.buf[sb.len - 1] == '\n')
@@ -1747,18 +1747,21 @@ int wt_status_check_rebase(const struct worktree *wt,
 {
 	struct stat st;
 
-	if (!stat(worktree_git_path(the_repository, wt, "rebase-apply"), &st)) {
-		if (!stat(worktree_git_path(the_repository, wt, "rebase-apply/applying"), &st)) {
+	if (!wt)
+		BUG("wt_status_check_rebase() called with NULL worktree");
+
+	if (!stat(worktree_git_path(wt, "rebase-apply"), &st)) {
+		if (!stat(worktree_git_path(wt, "rebase-apply/applying"), &st)) {
 			state->am_in_progress = 1;
-			if (!stat(worktree_git_path(the_repository, wt, "rebase-apply/patch"), &st) && !st.st_size)
+			if (!stat(worktree_git_path(wt, "rebase-apply/patch"), &st) && !st.st_size)
 				state->am_empty_patch = 1;
 		} else {
 			state->rebase_in_progress = 1;
 			state->branch = get_branch(wt, "rebase-apply/head-name");
 			state->onto = get_branch(wt, "rebase-apply/onto");
 		}
-	} else if (!stat(worktree_git_path(the_repository, wt, "rebase-merge"), &st)) {
-		if (!stat(worktree_git_path(the_repository, wt, "rebase-merge/interactive"), &st))
+	} else if (!stat(worktree_git_path(wt, "rebase-merge"), &st)) {
+		if (!stat(worktree_git_path(wt, "rebase-merge/interactive"), &st))
 			state->rebase_interactive_in_progress = 1;
 		else
 			state->rebase_in_progress = 1;
@@ -1774,7 +1777,10 @@ int wt_status_check_bisect(const struct worktree *wt,
 {
 	struct stat st;
 
-	if (!stat(worktree_git_path(the_repository, wt, "BISECT_LOG"), &st)) {
+	if (!wt)
+		BUG("wt_status_check_bisect() called with NULL worktree");
+
+	if (!stat(worktree_git_path(wt, "BISECT_LOG"), &st)) {
 		state->bisect_in_progress = 1;
 		state->bisecting_from = get_branch(wt, "BISECT_START");
 		return 1;
@@ -1819,18 +1825,19 @@ void wt_status_get_state(struct repository *r,
 	struct stat st;
 	struct object_id oid;
 	enum replay_action action;
+	struct worktree *wt = get_worktree_from_repository(r);
 
 	if (!stat(git_path_merge_head(r), &st)) {
-		wt_status_check_rebase(NULL, state);
+		wt_status_check_rebase(wt, state);
 		state->merge_in_progress = 1;
-	} else if (wt_status_check_rebase(NULL, state)) {
+	} else if (wt_status_check_rebase(wt, state)) {
 		;		/* all set */
 	} else if (refs_ref_exists(get_main_ref_store(r), "CHERRY_PICK_HEAD") &&
 		   !repo_get_oid(r, "CHERRY_PICK_HEAD", &oid)) {
 		state->cherry_pick_in_progress = 1;
 		oidcpy(&state->cherry_pick_head_oid, &oid);
 	}
-	wt_status_check_bisect(NULL, state);
+	wt_status_check_bisect(wt, state);
 	if (refs_ref_exists(get_main_ref_store(r), "REVERT_HEAD") &&
 	    !repo_get_oid(r, "REVERT_HEAD", &oid)) {
 		state->revert_in_progress = 1;
@@ -1848,6 +1855,8 @@ void wt_status_get_state(struct repository *r,
 	if (get_detached_from)
 		wt_status_get_detached_from(r, state);
 	wt_status_check_sparse_checkout(r, state);
+
+	free_worktree(wt);
 }
 
 static void wt_longstatus_print_state(struct wt_status *s)