CODEWITHSUNDEEP
dockerdockerfilecontainers
Vishesh
Vishesh

Reputation: 3769

Unable to move file in container using dockerfile

I have a very simple dockerfile which i have written but unfortunately, it is failing while executing below command in dockerfile:-

RUN ["cp -r", "node_modules/dir1/test/*", "/app"]

Below is the Error message which i get:-

OCI runtime create failed: container_linux.go:349: starting container process caused "exec: \"cp -r\": executable file not found in $PATH": unknown

I have also tried using "mv" command instead of "cp" but with no success.

I don't want to move the complete folder but all the content of folder. As said if i execute below command it works but, it moves the directory:-

RUN ["cp -r", "node_modules/dir1/test", "/app"]

Any Suggestions.? I have tried looking into many questions but, couldnt find a concrete explanation and the answer on how we can do it.?

Thanks, Vishesh.

Upvotes: 0

Views: 1465

Answers (2)

David Maze
David Maze

Reputation: 159732

Internally in Unix-like operating systems, commands are broken up into "words". When you use the JSON-array syntax for RUN, ENTRYPOINT, and CMD directives, you're explicitly specifying what the words are, and they're not further processed split up.

In particular when you run

RUN ["cp -r", "node_modules/dir1/test/*", "/app"]

it looks for a command named cp -r in the usual places, where the command name includes a space and a hyphen. It won't find /bin/cp which doesn't have a space and a hyphen and there isn't a /bin/cp\ -r. If this were to work, it would also pass its first argument containing a * in the filename, which will also fail.

The easiest solution here is to not use the JSON-array form. This will implicitly run a shell (the command is wrapped in /bin/sh -c) which will split words and expand globs for you.

RUN cp -r node_modules/dir1/test/* /app

If you didn't need the wildcard, you need to manually split cp and -r into separate words

RUN ["cp", "-r", "node_modules/dir1/test", "/app"]

Upvotes: 1

Ratish Bansal
Ratish Bansal

Reputation: 2462

First, you need to check if the cp command is available. Once it's available you need to add /. for copying the content only.

RUN ["cp -r", "node_modules/dir1/test/.", "/app/"]

Snapshot from the documentation. enter image description here

Upvotes: 1

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