#!/bin/sh
# makit installer — https://makit.sh
#
#   curl -fsSL https://makit.sh/install.sh | sh                    the latest release
#   curl -fsSL https://makit.sh/install.sh | sh -s -- v0.5.0       a given version
#   curl -fsSL https://makit.sh/v0.5.0/install.sh | sh             the same, version in the URL
#
# This file only finds the version to install and hands over to that release's own install.sh on GitHub
# (github.com/material-atomic/makit), which checks the downloaded source and the makit-core binary against the
# release's SHA256SUMS before installing anything.
# Read it first:   curl -fsSL https://makit.sh/install.sh | less
set -eu

repo=material-atomic/makit
version=${1:-${MAKIT_VERSION:-}}

if [ "$(id -u)" -ne 0 ]; then
  echo "makit: run as root (sudo -i, then the same command)" >&2
  exit 1
fi
command -v curl >/dev/null 2>&1 || { echo "makit: curl is required (apt-get install -y curl)" >&2; exit 1; }
command -v bash >/dev/null 2>&1 || { echo "makit: bash is required" >&2; exit 1; }

if [ -z "$version" ] || [ "$version" = latest ]; then
  # github.com/<repo>/releases/latest redirects to …/releases/tag/<version> (no API rate limit).
  latest=$(curl -fsSLI -o /dev/null -w '%{url_effective}' "https://github.com/$repo/releases/latest" || true)
  version=${latest##*/}
fi
case $version in
  v[0-9]*) ;;
  [0-9]*) version="v$version" ;;
  *) echo "makit: could not find the version to install — pass one: … | sh -s -- v0.5.0" >&2; exit 1 ;;
esac
case $version in
  *[!0-9A-Za-z.-]*) echo "makit: '$version' is not a version" >&2; exit 1 ;;
esac

# The tag must exist: a typo should fail here, not halfway through the install.
if ! curl -fsSLI -o /dev/null "https://github.com/$repo/releases/tag/$version"; then
  echo "makit: there is no release $version — see https://github.com/$repo/releases" >&2
  exit 1
fi

echo "makit: installing $version from https://github.com/$repo"
curl -fsSL "https://raw.githubusercontent.com/$repo/$version/install.sh" | MAKIT_VERSION="$version" bash