The file structures in the OL image bulit by paketo and ci.docker are different

[gkwan-ibm]

The OL image built by ci.docker has following file structures

• liberty runtime is located at /opt/ol/wlp
• server configuration is also located at /config
• logs files are located at /logs
• ifixes should be put at /opt/ol/fixes/

The OL image built by Paketo

• liberty runtime /layers/paketo-buildpacks_liberty/open-liberty-runtime-kernel
• server configuration and logs is located at /layers/paketo-buildpacks_liberty/open-liberty-runtime-kernel/usr/servers/defaultServer

For user experience reason, it is better for the Paketo OL image to have same file structures as ci.docker does.

[dmikusa]

That is not possible at the moment, sorry.

The buildpack spec requires files to be added under /layers. It is required for reasons related to buildpack rebase that I won't go into but also for security reasons. Buildpacks do not run as root so they cannot put files into the locations you referenced. /layers is a special location that is owned by the cnb user/group so buildpacks can write to it.

It might be possible to do this in the future with a builder extension, which can have elevated permissions. That functionality hasn't landed in buildpacks yet though so there's nothing Paketo could do about it now.

I agree with what you're saying, so I'll leave this open as a potential future enhancement. I can't guarantee it'll be implemented or provide any timeframe though, due to the reasons above.

[gkwan-ibm]

hi @dmikusa-pivotal

is there a doc to describe the file structure?

[dmikusa]

The buildpacks API spec dictates where most things end up, https://github.com/buildpacks/spec/blob/main/buildpack.md.