DL3045: COPY to a relative destination without WORKDIR set
Warning Maintainability
Why This Matters
When COPY uses a relative destination (e.g., COPY . app/) and no WORKDIR has been set in the current build stage, the destination resolves relative to the filesystem root (/). This is usually unintentional and makes the Dockerfile fragile because the behavior depends on the base image default WORKDIR. Files end up in unexpected locations and builds break in confusing ways. Set WORKDIR before using relative paths.
How to Fix
Set WORKDIR before COPY with relative destination
Before (incorrect)
FROM node:20
COPY . app/After (correct)
FROM node:20
WORKDIR /app
COPY . .Rule Details
- Rule Code
- DL3045
- Severity
- Warning
- Category
- Maintainability