Error copying folder using COPY --from from another layer-CodePudding

The Dockerfile uses the COPY --from command from the other build Node layer, but the generated directory is not found.
Note 1: This Dockerfile works locally on my machine doing builds normally.
Note 2: In the execution log it mentions the removal of an intermediate container, is that it? Would it be possible to preserve this container so that the copy works?

FROM node:16.16 as build
# USER node
WORKDIR /app
COPY package.json /app
RUN npm install --location=global npm@latest && npm install --silent
COPY . .
ARG SCRIPT
ENV SCRIPT=$SCRIPT
ARG API_URL
ENV API_URL=$API_URL
ARG API_SERVER
ENV API_SERVER=$API_SERVER
CMD ["/bin/sh",  "-c",  "envsubst < src/proxy.conf.template.js > src/proxy.conf.js"]
RUN npm run ${SCRIPT}

FROM nginx:1.23
VOLUME /var/cache/nginx
EXPOSE 80
COPY --from=build /app/dist/siai-spa /usr/share/nginx/html
COPY ./config/nginx-template.conf /etc/nginx/nginx-template.conf

b9ed43dcc388: Pull complete
Digest: sha256:db345982a2f2a4257c6f699a499feb1d79451a1305e8022f16456ddc3ad6b94c
Status: Downloaded newer image for nginx:1.23
 ---> 41b0e86104ba
Step 15/24 : VOLUME /var/cache/nginx
 ---> Running in dc0e24ae6e51
Removing intermediate container dc0e24ae6e51
 ---> 3b2799dad197
Step 16/24 : EXPOSE 80
 ---> Running in f30edd617285
Removing intermediate container f30edd617285
 ---> 21985745ce49
Step 17/24 : COPY --from=build /app/dist/siai-spa /usr/share/nginx/html
COPY failed: stat app/dist/siai-spa: file does not exist
Cleaning up project directory and file based variables
00:00
ERROR: Job failed: exit code 1

CodePudding user response：

I guess, you should use CMD instead of RUN while npm run ${SCRIPT} as this needs to be executed during container running time rather than image build time.

CodePudding user response：

Solved problem! The difference was that locally I used docker-compose which captures the build arguments from the .env file. The npm run command did not override the ${SCRIPT} variable as the docker command does not use the env file, required to pass through the --build-arg parameters.