• This is a bug report
• This is a feature request
• I searched existing issues before opening this one

Expected behavior

RUN apk -X https://dl-cdn.alpinelinux.org/alpine/edge/main add --no-cache lttng-ust=2.10.4-r0 pass the check

Actual behavior

RUN apk -X https://dl-cdn.alpinelinux.org/alpine/edge/main add --no-cache lttng-ust=2.10.4-r0 fails with

DL3018 Pin versions in apk add. Instead of apk add <package> use apk add <package>=<version>

Steps to reproduce the behavior

Run apk add -X .... The sample Dockerfile:

FROM alpine:3.11
RUN apk -X https://dl-cdn.alpinelinux.org/alpine/edge/main add --no-cache lttng-ust=2.10.4-r0

Output of hadolint --version

docker run --rm -i hadolint/hadolint hadolint --version
Haskell Dockerfile Linter v1.17.5-6-gbc8bab9

Notes

Probably, the issue could be solved just with adding X argument to the line: