#! /bin/bash
# SPDX-License-Identifier: GPL-2.0

readonly KSFT_FAIL=1
readonly KSFT_SKIP=4

# SELFTESTS_MPTCP_LIB_EXPECT_ALL_FEATURES env var can be set when validating all
# features using the last version of the kernel and the selftests to make sure
# a test is not being skipped by mistake.
mptcp_lib_expect_all_features() {
	[ "${SELFTESTS_MPTCP_LIB_EXPECT_ALL_FEATURES:-}" = "1" ]
}

# $1: msg
mptcp_lib_fail_if_expected_feature() {
	if mptcp_lib_expect_all_features; then
		echo "ERROR: missing feature: ${*}"
		exit ${KSFT_FAIL}
	fi

	return 1
}

# $1: file
mptcp_lib_has_file() {
	local f="${1}"

	if [ -f "${f}" ]; then
		return 0
	fi

	mptcp_lib_fail_if_expected_feature "${f} file not found"
}

mptcp_lib_check_mptcp() {
	if ! mptcp_lib_has_file "/proc/sys/net/mptcp/enabled"; then
		echo "SKIP: MPTCP support is not available"
		exit ${KSFT_SKIP}
	fi
}