sb.sh

#!/bin/bash
#########################################################################
# Title:         Saltbox: sb Binary Wrapper                             #
# Author(s):     salty                                                  #
# URL:           https://github.com/saltyorg/sb                         #
# --                                                                    #
#########################################################################
#                   GNU General Public License v3.0                     #
#########################################################################

################################
# Variables
################################

RELEASE_FILE="/srv/git/sb/release.txt"
TARGET_BINARY_PATH="/srv/git/sb/sb"

################################
# Functions
################################

run_cmd() {
    local cmd_exit_code

    "$@"
    cmd_exit_code=$?

    if [ $cmd_exit_code -ne 0 ]; then
        echo "Command failed with exit code $cmd_exit_code: $*" >&2
        exit $cmd_exit_code
    fi
}

download_binary() {
    local github_tag
    local version
    local download_url
    local temp_binary_path
    local file_type

    if ! command -v file > /dev/null 2>&1; then
        run_cmd sudo apt-get update
        run_cmd sudo apt-get install -y file
    fi

    if [ ! -f "${RELEASE_FILE}" ]; then
        echo "Error: ${RELEASE_FILE} does not exist." >&2
        exit 1
    fi

    github_tag=$(head -n 1 "${RELEASE_FILE}" | tr -d '[:space:]')
    if [[ ! "$github_tag" =~ ^refs/tags/ ]]; then
        echo "Error: Invalid tag format in ${RELEASE_FILE}." >&2
        exit 1
    fi

    version=${github_tag#refs/tags/}
    if [ -z "$version" ]; then
        echo "Error: No version found in tag $github_tag." >&2
        exit 1
    fi

    download_url="https://github.com/saltyorg/sb/releases/download/$version/sb"

    temp_binary_path="${TARGET_BINARY_PATH}.tmp"
    run_cmd curl -L -o "${temp_binary_path}" "${download_url}" > /dev/null 2>&1

    file_type=$(file -b --mime-type "${temp_binary_path}")
    if [[ "$file_type" != application/* ]]; then
        echo "Error: Downloaded file is not a binary. Detected type: $file_type" >&2
        run_cmd rm -f "${temp_binary_path}"
        exit 1
    fi

    run_cmd mv -f "${temp_binary_path}" "${TARGET_BINARY_PATH}"
    run_cmd chmod +x "${TARGET_BINARY_PATH}"
}

################################
# Main
################################

if [ ! -f "${TARGET_BINARY_PATH}" ]; then
    download_binary
fi

sudo "${TARGET_BINARY_PATH}" "$@"