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This patch replaces the hardcoded "pi" user in the dtoverlay-pre and dtoverlay-post scripts with $SUDO_USER, which is set by the sudo command to the ID of the user calling it. In the event that SUDO_USER isn't set, $LOGNAME is used (set by login shells), with an ultime fallback to "pi". This change is necessary for users who have changed the login ID, perhaps as a security measure.