#!/bin/bash
set -euo pipefail

# Check that only GPLv2 compatible licenses are used.

DEBUG=${DEBUG:-false}
if $DEBUG; then
  set -x
fi

if ! hash go-licenses; then
	printf 'ERROR: Please put the go-licenses tool in your path.\n' 1>&2
	printf 'ERROR: You can download it from https://github.com/google/go-licenses\n' 1>&2

	exit 1
fi

# Ensure mod files are up to date.
go mod tidy

# Get the licenses.
# TODO: get go-licenses working without silencing so many non-fatal errors
licenses=$(go-licenses csv storj.io/uplink-c --stderrthreshold=FATAL)

licenses_count=$(wc -l <<<"$licenses")
if [[ $licenses_count == 0 ]]; then
  printf 'ERROR: Failed to find any licenses.\n' 1>&2

  exit 1
fi

# MIT, ISC, and BSD-3-Clause are okay
# github.com/spacemonkeygo/monkit/v3 is excluded
exceptions=$(
(grep -vE ',(MIT|ISC|BSD-3-Clause)$' <<<"$licenses" || true) \
| (grep -vE '^github.com/spacemonkeygo/monkit/v3,' || true)
)

if [[ ! -z "$exceptions" ]]; then
  printf 'ERROR: License exceptions:\n' 1>&2
  cat 1>&2 <<<"$exceptions"

  exit 1
fi