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Instruction keywords should use consistent casing throughout the Dockerfile.
| Property | Value |
|---|
| Severity | Warning |
| Category | Style |
| Default | Enabled |
| Auto-fix | Yes (--fix) |
Description
Instruction keywords should use consistent casing (all lowercase or all
uppercase). Using a case that mixes uppercase and lowercase, such as PascalCase
or snakeCase, results in poor readability.
Examples
Bad:
From alpine
Run echo hello > /greeting.txt
EntRYpOiNT ["cat", "/greeting.txt"]
FROM alpine
RUN echo hello > /greeting.txt
ENTRYPOINT ["cat", "/greeting.txt"]
from alpine
run echo hello > /greeting.txt
entrypoint ["cat", "/greeting.txt"]
Auto-fix
The fix changes instruction keywords to match the majority casing in the
Dockerfile.
# Before (majority is uppercase)
FROM alpine
run echo hello
# After (with --fix)
FROM alpine
RUN echo hello
Reference