crossystem_boot_populator.sh

#!/bin/bash

# crossystem.sh v3.0.0
# made by r58Playz and stackoverflow
# emulates crossystem but with static values to trick chromeos and google
# version history:
# v3.0.0 - implemented mutable crossystem values
# v2.0.0 - implemented all functionality
# v1.1.1 - hotfix for stupid crossystem
# v1.1.0 - implemented <var>?<value> functionality (searches for value in var)
# v1.0.0 - basic functionality implemented

# script gutted by rainestorme for murkmod

. /usr/share/misc/chromeos-common.sh || :

csys() {
    if [ "$COMPAT" == "1" ]; then
        crossystem "$@"
    elif test -f "$ROOT/usr/bin/crossystem.old"; then
        "$ROOT/usr/bin/crossystem.old" "$@"
    else
        "$ROOT/usr/bin/crossystem" "$@"
    fi
}

sed_escape() {
    echo -n "$1" | while read -n1 ch; do
        if [[ "$ch" == "" ]]; then
            echo -n "\n"
            # dumbass shellcheck not expanding is the entire point
        fi
        echo -n "\\x$(printf %x \'"$ch")"
    done
}

# the only reason this blob is still here is because i don't want to add network dependency for a boot-time script
raw_crossystem_sh() {
    base64 -d <<-EOF | bunzip2 -dc
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bzVPfi2mxFTkn/F3JFOFCQFdrstw
EOF
}


drop_crossystem_sh() {
    # this weird space replacement is used because "read" has odd behaviour with spaces and newlines
    # i don't need to worry about the jank because crossystem will never have user controlled data
    vals=$(sed "s/ /THIS_IS_A_SPACE_DUMBASS/g" <<<"$(crossystem_values)")
    raw_crossystem_sh | sed -e "s/#__SED_REPLACEME_CROSSYSTEM_VALUES#/$(sed_escape "$vals")/g" | sed -e "s/THIS_IS_A_SPACE_DUMBASS/ /g" >"$ROOT/usr/bin/crossystem"
    chmod 777 "$ROOT/usr/bin/crossystem"
}

escape() {
    case $1 in
    '' | *[!0-9]*) echo -n "\"$1\"" ;;
    *) echo -n "$1" ;;
    esac
}

crossystem_values() {
    readarray -t csys_lines <<<"$(csys)"
    for element in "${csys_lines[@]}"; do
        line_stripped=$(echo "$element" | sed -e "s/#.*//g" | sed -e 's/ .*=/=/g')
        # sed 1: cuts out all chars after the #
        # sed 2: cuts out all spaces before =
        IFS='=' read -r -a pair <<<"$line_stripped"

        key=${pair[0]}
        # cut out all characters after an instance of 2 spaces in a row
        val="$(echo ${pair[1]} | sed -e 's/  .*//g')"
        if [ "$key" == "devsw_cur" ]; then
            val=0
        fi
        if [ "$key" == "devsw_boot" ]; then
            val=0
        fi
        if [ "$key" == "mainfw_type" ]; then
            val="normal"
        fi
        if [ "$key" == "mainfw_act" ]; then
            val="A"
        fi
        if [ "$key" == "cros_debug" ]; then
            val=1
        fi
        if [ "$key" == "dev_boot_legacy" ]; then
            val=0
        fi
        if [ "$key" == "dev_boot_signed_only" ]; then
            val=0
        fi
        if [ "$key" == "dev_boot_usb" ]; then
            val=0
        fi
        if [ "$key" == "dev_default_boot" ]; then
            val="disk"
        fi
        if [ "$key" == "dev_enable_udc" ]; then
            val=0
        fi
        if [ "$key" == "alt_os_enabled" ]; then
            val=0
        fi
        if [ "$key" == "recoverysw_boot" ]; then
            val=0
        fi
        if [ "$key" == "recoverysw_cur" ]; then
            val=0
        fi
        echo "$key=$(escape "$val")"
    done
}

mv "$ROOT/usr/bin/crossystem" "$ROOT/usr/bin/crossystem.old"
drop_crossystem_sh