Myujth

Using this Dockerfile with just the important parts highlighted for simplicity:

RUN cd /opencv-$OPENCV_VERSION/cmake_binary 
 && cmake -DBUILD_TIFF=ON 
 && make install

## Compress the openCV files so you can extract them from the docker easily 
RUN tar cvzf opencv-$OPENCV_VERSION.tar.gz --directory=$OPENCV_INSTALL_PATH .

Now, I want to build my application in a new container, so as far as I understand the documentation I can go:

FROM docker-opencv-cuda:cv3.3.1_cuda8 AS opencv

COPY -from=opencv /opencv/ /opencv/

However, I get an error:

invalid from flag value opencv: pull access denied for opencv, repository does not exist or may require 'docker login'

Looking around, it seems that COPY -from is trying to reference either a private or public repository, but I'd like it to look for my local version as docker image ls reports:

REPOSITORY TAG IMAGE ID
docker-opencv-cuda cv3.3.1_cuda8 xxxx
docker-opencv-cuda cv3.3.1_cuda9 yyyy

How can I do what I want to do? Adding to a repository is not a valid option as later I will have proprietary code that I cannot share, etc.

UPDATE: I might have found a bug? I have Docker 18.09.0, and given the lines:

ARG CV_VERSION=cv3.3.1_cuda8
FROM docker-opencv-cuda:$CV_VERSION AS opencv

COPY -from=opencv /opencv/ /opencv/
COPY -from=docker-opencv-cuda:$CV_VERSION /opencv/ /opencv/
COPY -from=docker-opencv-cuda:cv3.3.1_cuda8 /opencv/ /opencv/

Only the third COPY with the full -from label works.

UPDATE 2: Docker newbie problem. My Dockerfile is incorrect as -from should not refer to the current FROM, so this is OK and does what I want:

ARG CV_VERSION=cv3.3.1_cuda8
FROM docker-opencv-cuda:$CV_VERSION AS opencv

# Switch context so the OpenCV files no longer exist in the current image
FROM another_package

COPY -from=opencv /opencv/ /opencv/
COPY -from=docker-opencv-cuda:$CV_VERSION /opencv/ /opencv/
COPY -from=docker-opencv-cuda:cv3.3.1_cuda8 /opencv/ /opencv/

First map your local disk when start docker and copy data from docker into the local disk.

such as:

$ docker run --it -rm -v /your_path:/your_path your_image
# cp -rf /opencv /your_path 
# exit 

Then create your new docker, and copy the data from the local.