From 7307647ddbd2a722a5f63a7084ca703827992f80 Mon Sep 17 00:00:00 2001
From: Shuduo Sang <sangshuduo@gmail.com>
Date: Wed, 12 May 2021 22:01:03 +0800
Subject: [PATCH] [TD-4158]<fix>: taosdemo cmake failed with low version git.
 (#6106)

---
 src/kit/taosdemo/CMakeLists.txt | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/kit/taosdemo/CMakeLists.txt b/src/kit/taosdemo/CMakeLists.txt
index 4e38a8842e..5f75be0e19 100644
--- a/src/kit/taosdemo/CMakeLists.txt
+++ b/src/kit/taosdemo/CMakeLists.txt
@@ -10,7 +10,11 @@ IF (GIT_FOUND)
         COMMAND ${GIT_EXECUTABLE} log --pretty=oneline -n 1 ${CMAKE_CURRENT_LIST_DIR}/taosdemo.c
         RESULT_VARIABLE RESULT
         OUTPUT_VARIABLE TAOSDEMO_COMMIT_SHA1)
-    STRING(SUBSTRING "${TAOSDEMO_COMMIT_SHA1}" 0 7 TAOSDEMO_COMMIT_SHA1)
+    IF ("${TAOSDEMO_COMMIT_SHA1}" STREQUAL "")
+        MESSAGE("taosdemo's latest commit in short is:" ${TAOSDEMO_COMMIT_SHA1})
+    ELSE ()
+        STRING(SUBSTRING "${TAOSDEMO_COMMIT_SHA1}" 0 7 TAOSDEMO_COMMIT_SHA1)
+    ENDIF ()
     EXECUTE_PROCESS(
         COMMAND ${GIT_EXECUTABLE} status -z -s ${CMAKE_CURRENT_LIST_DIR}/taosdemo.c
         RESULT_VARIABLE RESULT