properly mount cache for npm

[flixman]

I am coming from docker, and moving to podman. In my dockerfile, I have the following statement RUN --mount=type=cache,target=/root/.npm npm install. I am running this on a podman-enabled Gitea runner, thus running on a podman-in-podman scenario. For what I have seen, in case TMPDIR is not defined (the case), I should get the /root/.npm folder in the building container mapped to /var/tmp/buildah-cache, which I am mapping in the outer container to a folder in the host... but I see that empty. While debugging this, I have observed that there is a chroot involved so... I do not see how to proceed to have this cache persisted.

Can anybody provide some help?

[nalind]

IIRC, since around 1.29 it's defaulted to /var/tmp/buildah-cache-$(id -u). Can you try mounting the host directory there instead?

[flixman]

I have just discovered that :-D now I am facing another problem, that is that the folder is owned by root (while the user running the container is 1000). I have created an issue in gitea, because I think I am doing something wrong there. Thank you anyway!