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#!/bin/bash

# This is a precompiled libos.so used as a drop-in replacement because default
# installations of Red Star OS 3.0 Desktop do not include GCC.
#
# sha256sum: 8661c311a18cb7a8be4624a9930c88b3a0f43d734bcafb26f9ea15651cda2800
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AAQAAAAEAAAAUeV0ZAAAAAAAAAAAAAAAAAAAAAAAAAAABgAAAAQAAAAEAAAAFAAAAAMAAABHTlUA
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X2N4YV9maW5hbGl6ZUBAR0xJQkNfMi4xLjMAX2luaXQA"

check_euid(){
    if [ "$(id -u)" != 0 ]; then
        echo "You need root privileges to run this script!"
        exit 1
    fi
}

disable_selinux(){
    setenforce 0
    sed -i'.bak' '/kernel \/boot\/vmlinuz-2.6.38.8-24.rs3.0.i686/ s/$/ selinux=0/' /boot/grub/grub.conf
}

disable_rtscan(){
    echo -e "import fcntl\nfcntl.ioctl(open('/dev/res', 'wb'), 29187)" | python
}

replace_libos(){
    echo "$LIBOS" | base64 -d > /usr/lib/libos.so.0.0.0
    rm /usr/lib/libos.so.0
    ln -s /usr/lib/libos.so.0.0.0 /usr/lib/libos.so.0
}

remove_autostarts(){
    mv /usr/share/autostart/scnprc.desktop /usr/share/autostart/scnprc.desktop.bak 2>/dev/null
    mv /etc/init/ctguard.conf /etc/init/ctguard.conf.bak 2>/dev/null
}

main(){
    check_euid
    
    echo "Disabling SELinux"
    disable_selinux
    
    echo "Killing securityd"
    killall -9 securityd 2>/dev/null
    
    echo "Disabling rtscan"
    disable_rtscan
    
    echo "Killing scnprc and opprc"
    killall scnprc opprc 2>/dev/null
    
    echo "Replacing libos"
    replace_libos
    
    echo "Disabling scnprc autostart"
    remove_autostarts
    
    echo "Done. Please press Return to reboot the system."
    read -r
    reboot
}

main
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