Merge branch 'ma/help-w-check-for-requested-page'

The error in "git help no-such-git-command" is handled better.

* ma/help-w-check-for-requested-page:
  help: make sure local html page exists before calling external processes

builtin/help.c

@@ -467,11 +467,14 @@ static void get_html_page_path(struct strbuf *page_path, const char *page)
 	if (!html_path)
 		html_path = to_free = system_path(GIT_HTML_PATH);
 
-	/* Check that we have a git documentation directory. */
+	/*
+	 * Check that the page we're looking for exists.
+	 */
 	if (!strstr(html_path, "://")) {
-		if (stat(mkpath("%s/git.html", html_path), &st)
+		if (stat(mkpath("%s/%s.html", html_path, page), &st)
 		    || !S_ISREG(st.st_mode))
-			die("'%s': not a documentation directory.", html_path);
+			die("'%s/%s.html': documentation file not found.",
+				html_path, page);
 	}
 
 	strbuf_init(page_path, 0);

t/t0012-help.sh

@@ -73,6 +73,22 @@ test_expect_success 'git help -g' '
 	test_i18ngrep "^   tutorial   " help.output
 '
 
+test_expect_success 'git help fails for non-existing html pages' '
+	configure_help &&
+	mkdir html-empty &&
+	test_must_fail git -c help.htmlpath=html-empty help status &&
+	test_must_be_empty test-browser.log
+'
+
+test_expect_success 'git help succeeds without git.html' '
+	configure_help &&
+	mkdir html-with-docs &&
+	touch html-with-docs/git-status.html &&
+	git -c help.htmlpath=html-with-docs help status &&
+	echo "html-with-docs/git-status.html" >expect &&
+	test_cmp expect test-browser.log
+'
+
 test_expect_success 'generate builtin list' '
 	git --list-cmds=builtins >builtins
 '