38.15.4. rootfs_overlay
Source: rootfs_overlay.
We use this directory for:
-
customized configuration files
-
userland module test scripts that don’t need to be compiled.
Contrast this with C examples that need compilation.
This directory is copied into the target filesystem by:
./copy-overlay ./build-buildroot
Source: copy-overlay
Build Buildroot is required for the same reason as described at: Section 2.2.2.2, “Your first kernel module hack”.
However, since the rootfs_overlay directory does not require compilation, unlike say kernel modules, we also make it 9P available to the guest directly even without ./copy-overlay at:
ls /mnt/9p/rootfs_overlay
This way you can just hack away the scripts and try them out immediately without any further operations.