rootdev

#!/bin/bash

# reMarkable 2 will not recognize root when using the stock version of rootdev, so we do this little hack.

# From gentoo wiki
cmdline() {
    local value
    value=" $(cat /proc/cmdline) "
    value="${value##* ${1}=}"
    value="${value%% *}"
    [ "${value}" != "" ] && echo "${value}"
}
function rootdev_new() {
    probed_path=$(echo -ne "$@ " | sed "s~-[cdis][cdis]*\s\s*~~g" | sed "s~--\(block\|dev\) [[:alnum:]/][[:alnum:]/]*\s\s*~~g" | sed "s~--\(minor\|major\) [0-9][0-9]*\s\s*~~g" | sed "s~\s*$~~g" | sed "s~\s*$~~g" | sed "s~^\s*~~g")
    
    if [ ! -e ${probed_path} ] || [[ ${probed_path} =~ ^\ +$ ]] || [[ "${probed_path}" == "" ]] ; then
        probed_path="/"
    fi
    probed_path=$(df --output=source ${probed_path} | tail -n1)
    if [[ ${probed_path} == "none" ]]; then
        echo -e "$(cmdline root)"
    else
        echo ${probed_path}
    fi
}
rootdev.old "$@" 1>/dev/null 2>/dev/null && rootdev.old "$@" || rootdev_new "$@"