install.sh

#!/usr/bin/env bash
# microcode installer.
#
#   curl -fsSL https://raw.githubusercontent.com/microclaw/microcode/main/install.sh | bash
#
# Detects OS/arch, downloads the matching binary from the latest GitHub
# release, and installs it. Honors:
#   MICROCODE_VERSION      Override the version to install (default: latest)
#   MICROCODE_INSTALL_DIR  Install directory (default: ~/.local/bin or /usr/local/bin)
#   MICROCODE_REPO         "owner/repo" override for forks (default: microclaw/microcode)

set -euo pipefail

REPO="${MICROCODE_REPO:-microclaw/microcode}"
VERSION="${MICROCODE_VERSION:-latest}"

red()   { printf '\033[31m%s\033[0m' "$*"; }
green() { printf '\033[32m%s\033[0m' "$*"; }
dim()   { printf '\033[2m%s\033[0m'  "$*"; }

err()  { echo "$(red error:) $*" >&2; exit 1; }
info() { echo "$(green ::) $*"; }
note() { echo "   $(dim "$*")"; }

need() {
  command -v "$1" >/dev/null 2>&1 || err "missing required tool: $1"
}

need uname
need curl
need tar
need install || true   # not strictly required

OS="$(uname -s)"
ARCH="$(uname -m)"
case "$OS" in
  Darwin)  os_tag="apple-darwin" ;;
  Linux)   os_tag="unknown-linux-gnu" ;;
  *)       err "unsupported OS: $OS" ;;
esac
case "$ARCH" in
  arm64|aarch64) arch_tag="aarch64" ;;
  x86_64|amd64)  arch_tag="x86_64" ;;
  *)             err "unsupported arch: $ARCH" ;;
esac
TARGET="${arch_tag}-${os_tag}"
info "detected target: $TARGET"

if [ "$VERSION" = "latest" ]; then
  api_url="https://api.github.com/repos/${REPO}/releases/latest"
  VERSION="$(curl -fsSL "$api_url" 2>/dev/null \
    | sed -n 's/.*"tag_name": *"\([^"]*\)".*/\1/p' | head -n1)"
  [ -n "$VERSION" ] || err "could not resolve latest release at $api_url"
fi
info "installing $REPO @ $VERSION"

asset="microcode-${VERSION#v}-${TARGET}.tar.gz"
url="https://github.com/${REPO}/releases/download/${VERSION}/${asset}"
note "$url"

if [ -n "${MICROCODE_INSTALL_DIR:-}" ]; then
  DEST="$MICROCODE_INSTALL_DIR"
elif [ -w /usr/local/bin ]; then
  DEST="/usr/local/bin"
else
  DEST="$HOME/.local/bin"
  mkdir -p "$DEST"
fi
info "install dir: $DEST"

tmp="$(mktemp -d)"
trap 'rm -rf "$tmp"' EXIT
( cd "$tmp" && curl -fSL --progress-bar "$url" -o "$asset" )
( cd "$tmp" && tar -xzf "$asset" )
[ -f "$tmp/microcode" ] || err "archive did not contain microcode binary"

mv "$tmp/microcode" "$DEST/microcode"
chmod +x "$DEST/microcode"
info "$(green installed) $DEST/microcode"

case ":$PATH:" in
  *":$DEST:"*) ;;
  *) note "(add $DEST to your PATH if it isn't already)" ;;
esac

"$DEST/microcode" --version