Update install.sh

plugins/zimg/install.sh

@@ -17,22 +17,25 @@ SYSOS=`uname`
 Install_libjpeg_turbo(){
 	mkdir -p $zimgSourceDir/libjpeg-turbo
 	cd $zimgSourceDir/libjpeg-turbo
+	if [ ! -d $zimgSourceDir/libjpeg-turbo ];then
 		wget https://downloads.sourceforge.net/project/libjpeg-turbo/1.3.1/libjpeg-turbo-1.3.1.tar.gz
 		tar zxvf libjpeg-turbo-1.3.1.tar.gz
 		cd libjpeg-turbo-1.3.1
 		./configure --prefix=/usr/local --with-jpeg8
 		make && make install
+	fi 
 }
 
 Install_zimg_source(){
 	mkdir -p $zimgSourceDir
 	cd $zimgSourceDir
+	if [ ! -d $zimgSourceDir/zimg ];then
 		git clone https://github.com/buaazp/zimg -b master --depth=1
 		cd zimg
 		make
-
+	fi
 	if [ -f $zimgSourceDir/zimg/bin/zimg ];then
-		mv $zimgSourceDir/zimg/bin $serverPath/zimg
+		cp -r $zimgSourceDir/zimg/bin $serverPath/zimg
 	fi
 }