From a62924f1c492fae3a4d5ebfa4e3cd10ac9c4495c Mon Sep 17 00:00:00 2001
From: yaphet <darion.yaphet@gmail.com>
Date: Fri, 19 Apr 2019 14:33:54 +0800
Subject: [PATCH] check .git before create pre-commit hook (#276)

---
 CMakeLists.txt | 33 +++++++++++++++++++--------------
 1 file changed, 19 insertions(+), 14 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 48064c2a37b..c6ab9a1ea3f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -310,19 +310,24 @@ add_custom_target(
 )
 
 
-# Create the pre-commit hook every time we run cmake
-set(PRE_COMMIT_HOOK ${CMAKE_CURRENT_SOURCE_DIR}/.git/hooks/pre-commit)
-execute_process(
-    COMMAND
-    "rm" "-f" ${PRE_COMMIT_HOOK}
-)
-execute_process(
-    COMMAND
-    "ln" "-s" ${CMAKE_CURRENT_SOURCE_DIR}/cpplint/bin/pre-commit.sh ${PRE_COMMIT_HOOK}
-	RESULT_VARIABLE retcode
-)
-IF(${retcode} EQUAL 0)
-    MESSAGE(STATUS "Creating pre-commit hook done")
+IF(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/.git/")
+    # Create the pre-commit hook every time we run cmake
+    message(STATUS "Create the pre-commit hook")
+    set(PRE_COMMIT_HOOK ${CMAKE_CURRENT_SOURCE_DIR}/.git/hooks/pre-commit)
+    execute_process(
+        COMMAND
+        "rm" "-f" ${PRE_COMMIT_HOOK}
+    )
+    execute_process(
+        COMMAND
+        "ln" "-s" ${CMAKE_CURRENT_SOURCE_DIR}/cpplint/bin/pre-commit.sh ${PRE_COMMIT_HOOK}
+        RESULT_VARIABLE retcode
+    )
+    IF(${retcode} EQUAL 0)
+        MESSAGE(STATUS "Creating pre-commit hook done")
+    ELSE()
+        MESSAGE(FATAL_ERROR "Creating pre-commit hook failed: ${retcode}")
+    ENDIF()
 ELSE()
-    MESSAGE(FATAL_ERROR "Creating pre-commit hook failed: ${retcode}")
+    MESSAGE(FATAL_ERROR "Currently, we don't support downloaded source code.\nPlease using git clone it and rebuild.")
 ENDIF()