英文:
Dockerfile for Python3 and OpenCV
问题
我需要一个带有Python3和最新版本OpenCV的Dockerfile。我编写的Dockerfile如下所述：
FROM ubuntu
#安装OpenCV
RUN apt-get update &&\
apt-get install -y cmake
RUN apt-get install -y gcc g++
RUN apt-get install -y python3-dev python3-numpy
# 支持GUI功能
RUN apt-get install -y libavcodec-dev libavformat-dev libswscale-dev
# 支持GTK 2
RUN apt-get install -y libgtk2.0-dev
# 支持GTK 3
RUN apt-get install -y libgtk-3-dev
#可选依赖项
RUN apt-get install -y libpng-dev
RUN apt-get install -y libjpeg-dev
RUN apt-get install -y libopenexr-dev
RUN apt-get install -y libtiff-dev
RUN apt-get install -y libwebp-dev
# 克隆OpenCV仓库
RUN apt-get install -y git
RUN git clone https://github.com/opencv/opencv.git
#编译
RUN mkdir /opencv/build && \
cd /opencv/build
RUN cmake ..
RUN make
然而，当我运行它时，出现了与 cmake 相关的以下错误：
Step 17/27 : RUN cmake ..
---> Running in 3dca32df2036
CMake Error: The source directory "/" does not appear to contain CMakeLists.txt.
Specify --help for usage, or press the help button on the CMake GUI.
The command '/bin/sh -c cmake ..' returned a non-zero code: 1
你知道我做错了什么吗？
英文:
I need to have a Dockerfile with Python3 and the latest version of OpenCV. The Dockerfile I have written is described below:
FROM ubuntu
#Install OpenCV
RUN apt-get update &&\
apt-get install -y cmake
RUN apt-get install -y gcc g++
RUN apt-get install -y python3-dev python3-numpy
# To support GUI features
RUN apt-get install -y libavcodec-dev libavformat-dev libswscale-dev
# To support GTK 2
RUN apt-get install -y libgtk2.0-dev
# To support GTK 3
RUN apt-get install -y libgtk-3-dev
#Optional dependencies
RUN apt-get install -y libpng-dev
RUN apt-get install -y libjpeg-dev
RUN apt-get install -y libopenexr-dev
RUN apt-get install -y libtiff-dev
RUN apt-get install -y libwebp-dev
# Clone OpenCV repo
RUN apt-get install -y git
RUN git clone https://github.com/opencv/opencv.git
#Compile
RUN mkdir /opencv/build && \
cd /opencv/build
RUN cmake ..
RUN make
However, when i run it, it gives me the following error with cmake.
Step 17/27 : RUN cmake ..
---> Running in 3dca32df2036
CMake Error: The source directory "/" does not appear to contain CMakeLists.txt.
Specify --help for usage, or press the help button on the CMake GUI.
The command '/bin/sh -c cmake ..' returned a non-zero code: 1
Do you know what am i doing wrong?
答案1
得分: 0
你只需要链式执行最后的 RUN 指令：
#编译
RUN mkdir /opencv/build && \
cd /opencv/build && \
cmake .. && \
make
解释：
RUN 语句会创建一个新的镜像层，并执行指定的 shell 命令。这意味着每个 RUN 语句将在单独的 shell 中运行命令，因此前一个 RUN 的当前目录不会被保留（通过仔细查看错误消息，您可以看到 CMake 的当前目录是 /）。
您可以在 Docker 文档 中找到有关 RUN 语句的更多信息，我还建议阅读 Dockerfile 最佳实践。
英文:
You just need to chain the last RUN instructions:
#Compile
RUN mkdir /opencv/build && \
cd /opencv/build && \
cmake .. && \
make
Explanation:
A RUN statement creates a new image layer and executes the specified shell command. This means that each RUN statement will run the command in a separate shell, so the current directory from the previous RUN will not be preserved (you can see that the CMake current directory is / by looking closely at the error message).
You can find more info about RUN statement in the Docker documentation and I also recommend reading Best practices for writing Dockerfiles.
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