Dummy sudo for proot-distro

sudo.sh

#!/bin/bash
# -----------------------------------------------------------------------------
# sudo.sh
#
# Description:
# A lightweight "dummy" sudo wrapper designed for proot-distro, Termux, or 
# containerized environments where the standard sudo binary is missing.
#
# Behaviour:
# - If running as root (EUID 0): Executes commands immediately and silently.
# - If running as a regular user: 
#    1. Prompts to continue with current user permissions.
#    2. If declined, offers to attempt execution via Termux native sudo.
#
# Rationale:
# Facilitates running scripts that hardcode 'sudo'. Provides a bridge between
# the proot guest environment and the Termux host sudo (for rooted devices).
#
# Installation:
# 1. Save this file to /usr/local/bin/sudo
# 2. Make it executable: chmod +x /usr/local/bin/sudo
# 3. (Optional) Map Termux sudo if available: 
#    ln -s /data/data/com.termux/files/usr/bin/sudo /usr/local/bin/sudo_termux
#
# Author: Jeremy Varnham https://github.com/jvarn
# License: MIT
# -----------------------------------------------------------------------------

TERMUX_SUDO="/data/data/com.termux/files/usr/bin/sudo"

# 1. If already root, execute silently
if [ "$EUID" -eq 0 ]; then
    if [ $# -eq 0 ]; then exit 0; fi
    exec "$@"
fi

# 2. First Prompt: Current User
echo "--------------------------------------------------------"
echo "WARNING: 'sudo' called by $(whoami)"
echo "Command: ${*:-[Privilege Check]}"
echo "--------------------------------------------------------"
read -p "Continue with current user permissions? (y/N): " confirm

if [[ "$confirm" =~ ^[yY](es)?$ ]]; then
    # Handle flags/empty calls
    if [ $# -eq 0 ] || ([[ "$1" == -* ]] && [ $# -eq 1 ]); then
        echo "Privilege check validated."
        exit 0
    fi
    exec "$@"
else
    # 3. Second Prompt: Alternative methods
    echo -e "\nPermission declined for current user."
    echo "1) Abort and exit"
    echo "2) Attempt via Termux native sudo (Requires Rooted Device)"
    read -p "Select an option (1/2): " choice

    case "$choice" in
        2)
            if [ -f "$TERMUX_SUDO" ]; then
                echo "Handing over to Termux sudo..."
                exec "$TERMUX_SUDO" "$@"
            else
                echo "Error: Termux sudo not found at $TERMUX_SUDO"
                exit 1
            fi
            ;;
        *)
            echo "Exiting: Sudo command cancelled."
            exit 1
            ;;
    esac
fi