205a83833e
systemd-repart implicitly excludes the contents of APIVFS and temporary directories (/proc, /sys, /dev, /tmp, /run, /var/tmp) when copying files via CopyFiles=. When populating a root partition, the contents below the mount points of other partitions in the image (e.g. /boot, /efi for an esp partition) are excluded as well, so that data belonging to a separate partition is not duplicated into the root file system. Neither of these implied denylists was documented, which surprised users (see #32651). Document them, and explain how to work around the mount-point exclusion by adding an explicit CopyFiles= entry for the directory in question. Fixes #32651
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