Problems problems

Dockerfile

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+FROM node
+
+RUN mkdir /app
+COPY . /app
+
+WORKDIR /app
+RUN yarn
+
+ENTRYPOINT ["yarn", "start"]

README.md

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+This project recreates the issues with layers disappearing from images when using the `cache-from` argument.
+
+To recreate run the following steps:
+
+```
+DOCKER_BUILDKIT=1 docker build -t cgreening/cache_problem:1 .  --build-arg BUILDKIT_INLINE_CACHE=1
+docker push cgreening/cache_problem:1
+docker run -it --entrypoint /bin/bash cgreening/cache_problem:1
+root@f3b83bd929e6:/app# ls
+Dockerfile  README.md  index.js  node_modules  package.json  yarn.lock
+```
+
+Clean up just like on the build machine:
+
+```
+docker system prune -a
+```
+
+Build again
+
+```
+DOCKER_BUILDKIT=1 docker build -t cgreening/cache_problem:2 .  --build-arg BUILDKIT_INLINE_CACHE=1 --cache-from cgreening/cache_problem:1
+docker push cgreening/cache_problem:2
+docker run -it --entrypoint /bin/bash cgreening/cache_problem:2
+root@f3b83bd929e6:/app# ls
+Dockerfile  README.md  index.js  node_modules  package.json  yarn.lock
+```
+
+Clean up again:
+
+```
+docker system prune -a
+```
+
+Build again
+
+```
+DOCKER_BUILDKIT=1 docker build -t cgreening/cache_problem:3 .  --build-arg BUILDKIT_INLINE_CACHE=1 --cache-from cgreening/cache_problem:2
+docker push cgreening/cache_problem:3
+docker run -it --entrypoint /bin/bash cgreening/cache_problem:3
+root@462e81ea94e4:/app# ls
+Dockerfile  README.md  index.js  package.json
+```
+
+You will see that there is no `node_modules` folder. This folder should have been created by the step:
+
+```
+RUN yarn
+```

index.js

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+console.log("It works!");

package.json

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+{
+  "name": "docker-cache-issue",
+  "version": "1.0.0",
+  "main": "index.js",
+  "author": "Chris Greening <[email protected]>",
+  "license": "MIT"
+}