TypeError: Cannot read property 'reduce' of null #156
Description
When using this Dockerfile with the latest dockerfilelint docker image, an internal error shows up. I checked using /bin/sh to make sure the Dockerfile is accessible, I tried moving the Dockerfile to the working directory of /dockerfilelint/ and using the binary inside /dockerfilelint/bin/ but I got the same error message.
Dockerfile
FROM node:12-alpine as dependencies
# Source directory
WORKDIR /usr/src/app/
RUN chown -R node:node .
USER node
# Dependencies
COPY --chown=node:node package*.json ./
RUN npm ci
# Source code and build configuration
COPY --chown=node:node angular.json tsconfig*.json ./
COPY --chown=node:node ngsw-config.json .
COPY --chown=node:node src/ src/
# Compilation
FROM dependencies as build
RUN npx ng build --prod
FROM nginx:stable-alpine
# hadolint ignore=DL3018
RUN apk --no-cache add curl \
&& rm -rf /var/cache/apk/*
HEALTHCHECK CMD curl -f http://localhost/ || exit 1
COPY --chown=nginx:nginx --from=build /usr/src/app/dist/bouwmapp-frontend/ /usr/share/nginx/app/
COPY --chown=nginx:nginx nginx/app.conf /etc/nginx/conf.d/default.conf
EXPOSE 80Command
docker run --rm -v "$PWD"/Dockerfile:/Dockerfile:ro replicated/dockerfilelint:latest /DockerfileOutput
/dockerfilelint/lib/checks.js:194
if (!options.reduce((valid, item) => valid &&
^
TypeError: Cannot read property 'reduce' of null
at Object.is_valid_healthcheck (/dockerfilelint/lib/checks.js:194:20)
at runLine (/dockerfilelint/lib/index.js:287:16)
at Object.module.exports.run (/dockerfilelint/lib/index.js:63:18)
at processContent (/dockerfilelint/bin/dockerfilelint:92:50)
at argv._.forEach (/dockerfilelint/bin/dockerfilelint:86:3)
at Array.forEach (<anonymous>)
at Object.<anonymous> (/dockerfilelint/bin/dockerfilelint:65:8)
at Module._compile (internal/modules/cjs/loader.js:702:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:713:10)
at Module.load (internal/modules/cjs/loader.js:612:32)