Simple script to install the MiniIO (S3-compatible storage) command-line tool `mc`.

install-mc.sh

#!/usr/bin/env bash
set -euo pipefail

# Colored, prefixed logging
COLOR_RESET="\033[0m"
COLOR_CYAN="\033[1;36m"
COLOR_RED="\033[1;31m"
COLOR_GREEN="\033[1;32m"
COLOR_AMBER="\033[0;33m"

log_info()    { printf "%b[*] %b%s%b\n"    "$COLOR_CYAN" "$COLOR_RESET" "$1" ""; }
log_success() { printf "%b[+] %b%s%b\n"    "$COLOR_GREEN" "$COLOR_RESET" "$1" ""; }
log_warn()    { printf "%b[!] %b%s%b\n"    "$COLOR_AMBER" "$COLOR_RESET" "$1" ""; }
log_error()   { printf "%b[-] %b%s%b\n"    "$COLOR_RED" "$COLOR_RESET" "$1" ""; }

# Defaults
DEST="/usr/local/bin/mc"
TMPDIR="${TMPDIR:-/tmp}"
FORCE=0

usage() {
  cat <<EOF
Usage: $(basename "$0") [--force] [--dest /path/to/mc]
Installs the MinIO mc CLI to $DEST by default.
  --force    Overwrite existing installation without prompting.
  --dest     Destination path (default: $DEST)
  -h, --help Show this help.
EOF
  exit 1
}

# Parse args (simple)
while [[ $# -gt 0 ]]; do
  case "$1" in
    --force) FORCE=1; shift ;;
    --dest) DEST="$2"; shift 2 ;;
    -h|--help) usage ;;
    *) log_error "Unknown arg: $1"; usage ;;
  esac
done

# Ensure running as root (or writable DEST)
if ! [ -w "$(dirname "$DEST")" ] && [ "$(id -u)" -ne 0 ]; then
  log_error "Must be run as root or with write permission to $(dirname "$DEST"). Use sudo."
  exit 1
fi

# Check dependencies
if ! command -v curl >/dev/null 2>&1; then
  log_error "curl is required but not installed."
  exit 1
fi
if ! command -v uname >/dev/null 2>&1; then
  log_error "uname is required but missing."
  exit 1
fi

log_info "Attempting to detect architecture..."
ARCH=$(uname -m || true)
case "$ARCH" in
  x86_64)   URL="https://dl.min.io/client/mc/release/linux-amd64/mc"; ARCH_LABEL="x86_64" ;;
  aarch64)  URL="https://dl.min.io/client/mc/release/linux-arm64/mc"; ARCH_LABEL="aarch64" ;;
  arm64)    URL="https://dl.min.io/client/mc/release/linux-arm64/mc"; ARCH_LABEL="arm64" ;;
  ppc64le)  URL="https://dl.min.io/client/mc/release/linux-ppc64le/mc"; ARCH_LABEL="ppc64le" ;;
  s390x)    URL="https://dl.min.io/client/mc/release/linux-s390x/mc"; ARCH_LABEL="s390x" ;;
  *)
    log_error "Unsupported architecture: $ARCH"
    exit 1
    ;;
esac
log_success "Architecture ${ARCH_LABEL} detected."

# Already installed?
if command -v mc >/dev/null 2>&1; then
  INST_PATH=$(command -v mc)
  INST_VER=$(mc --version 2>/dev/null || echo "unknown")
  log_info "Detected existing mc at ${INST_PATH} (${INST_VER})."
  if [ "$FORCE" -ne 1 ]; then
    printf "%b" "${COLOR_CYAN}"
    read -r -p "[*] Overwrite and install to ${DEST}? (y/N) " REPLY
    printf "%b" "${COLOR_RESET}"
    REPLY=${REPLY:-N}
    if [[ ! "$REPLY" =~ ^[Yy]$ ]]; then
      log_info "Aborting; existing installation preserved."
      exit 0
    fi
  else
    log_info "--force supplied; will overwrite existing installation."
  fi
fi

log_info "Attempting to download ${ARCH_LABEL} executable from: ${URL}..."

# Create secure temp file
TMPFILE=$(mktemp --tmpdir="$TMPDIR" mc.XXXXXX) || { log_error "Failed to create temp file"; exit 1; }
cleanup() {
  rm -f "$TMPFILE"
}
trap cleanup EXIT

# Download
if ! curl -fsSL --location "$URL" -o "$TMPFILE"; then
  log_error "Download failed from: $URL"
  exit 1
fi

# Validate minimal size (non-empty, heuristic)
if [ ! -s "$TMPFILE" ] || [ "$(stat -c%s "$TMPFILE")" -lt 10240 ]; then
  log_error "Downloaded file is empty or unexpectedly small."
  exit 1
fi

# Atomic install: write to temporary dest then move
DEST_DIR=$(dirname "$DEST")
mkdir -p "$DEST_DIR"
CHOWN_CMD=""
if [ "$(id -u)" -eq 0 ]; then
  # preserve mode and owner root
  INSTALL_TMP="${DEST}.tmp.$$"
  if ! mv "$TMPFILE" "$INSTALL_TMP"; then
    log_error "Failed to move temporary file to ${INSTALL_TMP}"
    exit 1
  fi
  chmod 0755 "$INSTALL_TMP"
  if ! mv -f "$INSTALL_TMP" "$DEST"; then
    log_error "Failed to move ${INSTALL_TMP} to ${DEST}"
    exit 1
  fi
else
  # non-root: try install by cp
  if ! cp "$TMPFILE" "$DEST"; then
    log_error "Failed to copy file to ${DEST}; need root privileges."
    exit 1
  fi
  chmod 0755 "$DEST"
fi

# Verify install works
if ! "$DEST" --version >/dev/null 2>&1; then
  log_error "Installed binary at ${DEST} failed to execute."
  exit 1
fi

log_success "mc installed to ${DEST}."
log_success "$DEST --version: $("$DEST" --version | head -n1)"

exit 0
```