Metadata

ID: docker-best-practices/copy-end-slash

Language: Docker

Severity: Warning

Category: Best Practices

Description

This rule enforces that when the COPY instruction in a Dockerfile has more than two arguments, the last argument must be a directory path ending with a slash (/). This ensures that multiple source files or directories are copied into the specified destination directory correctly. Always ensure that when copying multiple files or directories, the destination path ends with a slash, clearly indicating it is a directory. For example, use COPY package.json yarn.lock my_app/ instead of COPY package.json yarn.lock my_app. This practice improves clarity and prevents ambiguous or incorrect Docker image builds.

Non-Compliant Code Examples

FROM node:carbon
COPY package.json yarn.lock my_app

Compliant Code Examples

FROM node:carbon
COPY package.json yarn.lock my_app/

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