add ubuntu 18.04 support

deploy/cpp/scripts/bootstrap.sh

@@ -8,10 +8,31 @@ fi
 
 # download pre-compiled opencv lib
 OPENCV_URL=https://bj.bcebos.com/paddleseg/deploy/opencv3.4.6gcc4.8ffmpeg.tar.gz2
+system_name=`awk -F= '/^NAME/{print $2}' /etc/os-release `
+system_version=`awk -F= '/^VERSION_ID/{print $2}' /etc/os-release `
+
+# download pre-compiled opencv lib
+OPENCV_URL=https://bj.bcebos.com/paddleseg/deploy/opencv3.4.6gcc4.8ffmpeg.tar.gz2
+if [ $system_name = '"Ubuntu"' ]
+then
+    if [ $system_version = '"18.04"' ]
+    then
+        OPENCV_URL=https://bj.bcebos.com/paddlex/deploy/opencv3.4.6gcc4.8ffmpeg_ubuntu_18.04.tar.gz2
+    elif [ $system_version = '"16.04"' ]
+    then
+        OPENCV_URL=https://bj.bcebos.com/paddleseg/deploy/opencv3.4.6gcc4.8ffmpeg.tar.gz2
+    else
+        echo "Cannot find pre-comipled opencv lib for your system environment, refer this doc for more information: https://github.com/PaddlePaddle/PaddleX/tree/develop/docs/deploy/opencv.md"
+        exit -1
+    fi
+else
+    echo "Cannot find pre-comipled opencv lib for your system environment, refer this doc for more information: https://github.com/PaddlePaddle/PaddleX/tree/develop/docs/deploy/opencv.md"
+fi
+
 if [ ! -d "./deps/opencv3.4.6gcc4.8ffmpeg/" ]; then
     mkdir -p deps
     cd deps
-    wget -c ${OPENCV_URL}
+    wget -c ${OPENCV_URL} -O opencv3.4.6gcc4.8ffmpeg.tar.gz2
     tar xvfj opencv3.4.6gcc4.8ffmpeg.tar.gz2
     rm -rf opencv3.4.6gcc4.8ffmpeg.tar.gz2
     cd ..

docs/deploy/index.rst

@@ -13,3 +13,4 @@
    paddlelite/index
    openvino/index
    raspberry/index
+   opencv.md

docs/deploy/opencv.md

+# 部署编译说明
+
+目前PaddleX所有的模型部署测试环境为
+- Ubuntu 16.04/18.04  / Windows 10
+- gcc 4.8.5 / Microsoft Visual Studio 2019
+
+如果切换至其它Linux系统环境（gcc版本不变)，预期会遇到opencv的问题。
+
+在Linux编译脚本中，例如`deploy/cpp/script/build.sh`中，依赖`deploy/cpp/script/bootstrap.sh`去自动下载预先已经编译好的依赖的opencv库和加密库。而目前`bootstrap.sh`只提供了OpenCV在Ubuntu16.04/18.04两个系统环境下的预编译包，如果你的系统与此不同，尝试按照如下方式解决。
+
+
+## Linux下自编译OpenCV
+
+### 1. 下载OpenCV Source Code  
+前往OpenCV官方网站下载OpenCV 3.4.6 Source Code，或者直接[点击这里](https://bj.bcebos.com/paddlex/deploy/opencv-3.4.6.zip)下载我们已经上传至服务器的源码压缩包。
+
+### 2. 编译OpenCV
+确认自己的gcc/g++版本为4.8.5版本，编译过程参考如下代码  
+
+当前opencv-3.4.6.zip存放路径为`/home/paddlex/opencv-3.4.6.zip`
+```
+unzip opencv-3.4.6.zip
+cd opencv-3.4.6
+mkdir build && cd build
+mkdir opencv3.4.6gcc4.8ffmpeg
+cmake -DCMAKE_BUILD_TYPE=RELEASE -DCMAKE_INSTALL_PREFIX=/home/paddlex/opencv-3.4.6/build/opencv3.4.6gcc4.8ffmpeg -D WITH_FFMPEG=ON ..
+make -j5
+make install
+```
+编译好的opencv会存放在设定的`/home/paddlex/opencv-3.4.6/build/opencv3.4.6gcc4.8ffmpeg`下
+
+### 3. 编译PaddleX预测代码依赖自己的opencv
+修改`deploy/cpp/script/build.sh`
+
+1. 注释或删除掉如下一行代码
+
+```
+sh $(pwd)/scripts/bootstrap.sh # 下载预编译版本的加密工具
+```
+
+2. 模型加密开关设置
+如果您不需要用到PaddleX的模型加密功能，则将如下开关修改为OFF即可
+```
+WITH_ENCRYPTION=OFF
+```
+如果需要用到加密，则请手动下载加密库后解压，[点击下载](https://bj.bcebos.com/paddlex/tools/paddlex-encryption.zip)
+
+3. 设置依赖库路径
+将`OPENCV_DIR`设置为自己编译好的路径，如
+```
+OPENCV_DIR=/home/paddlex/opencv-3.4.6/build/opencv3.4.6gcc4.8ffmpeg
+```
+如果您还需要用到模型加密，已经将`WITH_ENCRYPTION`设为`ON`的前提下，也同时将`ENCRYPTION_DIR`设置为自己下载解压后的路径，如
+```
+ENCRYPTION_DIR=/home/paddlex/paddlex-encryption
+```
+
+4. 执行`sh script/build.sh`编译即可
+
+## 反馈
+
+如在使用中仍然存在问题，请前往PaddleX的Github提ISSUE反馈给我们。
+
+- [PaddleX Issue](https://github.com/PaddlePaddle/PaddleX/issues)