Dockerfile: unable to copy file

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As my Docker container starts up, I need to run this line:

cp /lib/libc.musl-x86_64.so.1 /lib/ld-linux-x86-64.so.2

Both of these files only exist in the Docker container after some packages have been installed.

In the Dockerfile, I have tried:

RUN cp /lib/libc.musl-x86_64.so.1 /lib/ld-linux-x86-64.so.2

COPY /lib/libc.musl-x86_64.so.1 /lib/ld-linux-x86-64.so.2

ENTRYPOINT ["cp","/lib/libc.musl-x86_64.so.1 /lib/ld-linux-x86-64.so.2"]

And also created a bash script that contains (among other things) this line. I know the script has run as the other changes it makes are present, but the file is not copied.

#!/bin/sh

apk add build-base
apk add libc6-compat

cp /lib/libc.musl-x86_64.so.1 /lib/ld-linux-x86-64.so.2

Then run with

RUN ./my_bash_script.sh

However, when I use the command line in the Docker container, and run the line manually, it works.

Why are the Dockerfile commands not copying this file?

Edit: My complete Dockerfile

FROM golang:alpine
ENV APP_NAME hello-world
ADD env_setup.sh .
RUN chmod +x env_setup.sh
RUN ./env_setup.sh
WORKDIR /home/helloworld
ADD vendor/ ./vendor/
COPY main.go .
COPY go.mod .
dockerfile docker linux
1 Answers

Multiple resources may be specified but the paths of files and directories will be interpreted as relative to the source of the context of the build

Try to firstly copy the file to the local directory where the Dockerfile is located

Then

COPY libc.musl-x86_64.so.1 /lib/ld-linux-x86-64.so.2
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