disowned

#!/usr/bin/env sh
# compat: +ash +bash +dash +zsh

disowned() { ### @- find files in system directories that aren't associated with any pacman packages.
    #
    # Lists Pacman disowned files.
    #
    # Authors:
    #   Benjamin Boudreau <dreurmail@gmail.com>
    #   Sorin Ionescu <sorin.ionescu@gmail.com>
    #

    TMPDIR=/tmp
    local tmp="$TMPDIR/pacman-disowned-$UID-$$"

    mkdir -p "$tmp"
    #trap 'rm -rf "$tmp"' EXIT # dangerous, needs fixing

    pacman --quiet --query --list | sort -u > "$tmp/db"

    if [ -n "$MSYSTEM" ]; then
        # this excludes /bin due to confusion over symlinks.
        # /lib and /sbin don't exist.
        set -- /clang32 /clang64 /clangarm64 /etc /mingw32 /mingw64 /ucrt64 /usr
    else
        set -- /bin /etc /lib /sbin /usr
    fi

    find "$@" ! -name lost+found \
    \( -type d -printf '%p/\n' -o -print \) \
      | grep -v '^/etc/pacman.d/gnupg/' \
      | grep -v '^/usr/busybox/' \
      | grep -v '/__pycache__/' \
      | sort -u \
      > "$tmp/fs"

    comm -23 "$tmp/fs" "$tmp/db"
}

[ -n "${preload+-}" ] || disowned "$@"