Using cflinuxfs3 with multiple buildpacks results in `failed to write buildpack group: open /workspace/group.toml: permission denied` about lifecycle HOT 3 CLOSED

hey @dmikusa-pivotal it looks like this problem occurs when you rebuild the same app using two different builders with different PACK_USER_ID and PACK_USER_GID values.

If you build with a builder based on the io.buildpacks.stacks.bionic stack, files in the cache volume will be owned by pack. If you subsequently build with a cflinuxfs3 builder, you will see this permission error.

We can fix this in pack by ensuring we change the ownership of all files in the cache volume before detecting. However this problem situation should be unlikely to arise after we play buildpacks/roadmap#28.

For now, if you remove the cache volume between builds or build from different paths in these two cases, you can work around the issue.

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Excellent! I'll give that a try. Thanks!

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Following up. That did, in fact, resolve the issue I was seeing. I just missed those cache volumes.

Running docker volume ls shows the volumes and docker volume prune seemed to clean them up.

Thanks!

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