#!/bin/sh

# Copyright (C) 2018-2025 Internet Systems Consortium, Inc. ("ISC")
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

# Check revisions
#
# This developer script verifies versions in module contents match
# the version in the name.
# Requires yanglint to translate YANG to YIN formats.
# Fixme: use xlstproc to extract the revision.

# Exit with error if commands exit with non-zero and if undefined variables are
# used.
set -eu

# Change directory to the YANG modules' directory.
script_path=$(cd "$(dirname "${0}")" && pwd)
cd "${script_path}/@top_srcdir@/src/share/yang/modules"

exit_code=0

LIBYANG_PREFIX='@LIBYANG_PREFIX@'

# Find yanglint.
if test -f "${LIBYANG_PREFIX}/bin/yanglint"; then
    yanglint="${LIBYANG_PREFIX}/bin/yanglint"
    LD_LIBRARY_PATH="${LD_LIBRARY_PATH-}:${LIBYANG_PREFIX}/lib:${LIBYANG_PREFIX}/lib64"
    export LD_LIBRARY_PATH
elif command -v yanglint; then
    yanglint='yanglint'
else
    exit_code=$((exit_code | 2))
    printf 'ERROR: cannot find yanglint.\n' >&2
    exit "${exit_code}"
fi

# shellcheck disable=SC2044
# SC2044 (warning): For loops over find output are fragile. Use find -exec or a while read loop.
# reason: Involving IFS, and read, and input redirection is not less fragile.
for m in $(find . -type f -name '*.yang'); do
    rev1=$("${yanglint}" -f yin "${m}" | grep '<revision date=' | head -1 | sed \
 's/.*<revision date="\([0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]\)".*/\1/')
    rev2=$(echo "${m}" | sed \
 's/.*@\([0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]\)\..*/\1/')

    if test "${rev1}" != "${rev2}"; then
        exit_code=$((exit_code | 4))
        printf 'ERROR: revision mismatch on module %s: revision date is %s, file name has %s.\n' "${m}" "${rev1}" "${rev2}" >&2
    fi
done

exit "${exit_code}"
