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This document is about using your user's ccache from inside a RUA sandbox. If you configure makepkg to use ccache as described in ArchWiki, build will fail with error messages like:

ccache: error: Failed to create temporary file for /run/user/1000/ccache-tmp/tmp.cpp_stdout.zdMorR: Read-only file system
ccache: error: Failed to create temporary file for /run/user/1000/ccache-tmp/tmp.cpp_stdout.A7CGmu: Read-only file system
ccache: error: Failed to create temporary file for /run/user/1000/ccache-tmp/tmp.cpp_stdout.hAwjZX: Read-only file system

This is intentional, as no program running in the sandbox is allowed to have access to /run/user/1000.

On top of that, even if ccache would have access to this folder, the cache would be lost after the package was built since ccache has no access to the user's ccache folder in ~/.ccache.

What to do?

You can work around the issue by

  1. giving ccache access to your ~/.ccache folder. In theory you can attach any local foder to ~/.ccache in the sandbox, but for simplicity it is assumed that your ccache folder in in your home directory.
  2. asking ccache to use a different temporary directory. As /tmp is created only for this sandbox, we simply choose a folder below.

In order to implement the aforementioned changes, all you need to do is create ~/.config/rua/wrap_args.d/ccache.sh with the following content:

wrap_args+=(--bind-try ~/.ccache ~/.ccache)
export CCACHE_TEMPDIR=/tmp/ccache