Merge branch 'en/keep-cwd' into maint

Fix a regression in 2.35 that roke the use of "rebase" and "stash"
in a secondary worktree.

* en/keep-cwd:
  sequencer, stash: fix running from worktree subdir

Author: gitster

builtin/stash.c

@@ -1539,8 +1539,12 @@ static int do_push_stash(const struct pathspec *ps, const char *stash_msg, int q
 			struct child_process cp = CHILD_PROCESS_INIT;
 
 			cp.git_cmd = 1;
-			if (startup_info->original_cwd)
+			if (startup_info->original_cwd) {
 				cp.dir = startup_info->original_cwd;
+				strvec_pushf(&cp.env_array, "%s=%s",
+					     GIT_WORK_TREE_ENVIRONMENT,
+					     the_repository->worktree);
+			}
 			strvec_pushl(&cp.args, "clean", "--force",
 				     "--quiet", "-d", ":/", NULL);
 			if (include_untracked == INCLUDE_ALL_FILES)

sequencer.c

@@ -4223,8 +4223,11 @@ static int run_git_checkout(struct repository *r, struct replay_opts *opts,
 
 	cmd.git_cmd = 1;
 
-	if (startup_info->original_cwd)
+	if (startup_info->original_cwd) {
 		cmd.dir = startup_info->original_cwd;
+		strvec_pushf(&cmd.env_array, "%s=%s",
+			     GIT_WORK_TREE_ENVIRONMENT, r->worktree);
+	}
 	strvec_push(&cmd.args, "checkout");
 	strvec_push(&cmd.args, commit);
 	strvec_pushf(&cmd.env_array, GIT_REFLOG_ACTION "=%s", action);

t/t3400-rebase.sh

@@ -416,4 +416,25 @@ test_expect_success MINGW,SYMLINKS_WINDOWS 'rebase when .git/logs is a symlink'
 	mv actual_logs .git/logs
 '
 
+test_expect_success 'rebase when inside worktree subdirectory' '
+	git init main-wt &&
+	(
+		cd main-wt &&
+		git commit --allow-empty -m "initial" &&
+		mkdir -p foo/bar &&
+		test_commit foo/bar/baz &&
+		mkdir -p a/b &&
+		test_commit a/b/c &&
+		# create another branch for our other worktree
+		git branch other &&
+		git worktree add ../other-wt other &&
+		cd ../other-wt &&
+		# create and cd into a subdirectory
+		mkdir -p random/dir &&
+		cd random/dir &&
+		# now do the rebase
+		git rebase --onto HEAD^^ HEAD^  # drops the HEAD^ commit
+	)
+'
+
 test_done