#!/usr/bin/env bash

# yadm - Yet Another Dotfiles Manager
# Copyright (C) 2015-2019 Tim Byrne and Martin Zuther

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.


YADM_DIRECTORY=$(dirname $YADM_HOOK_REPO)
YADM_CHECKSUMS=$YADM_DIRECTORY/files.checksums


# check if "shasum" exists
if command -v shasum > /dev/null; then
    # check if "shasum" supports SHA-512/256 algorithm
    echo -n | shasum --algorithm 512256 2>&1 1> /dev/null

    if [ $? -ne 0 ]; then
        echo
        echo "WARNING: \"shasum\" does not support SHA-512/256.  No checksums were created."
        exit $YADM_HOOK_EXIT
    fi

    # empty checksum file
    echo -n > $YADM_CHECKSUMS

    # calculate checksums for encrypted files
    for included in ${YADM_ENCRYPT_INCLUDE_FILES[@]}; do
        shasum --algorithm 512256 $included >> $YADM_CHECKSUMS
        ERROR_CODE=$?

        # signal errors
        if [ $ERROR_CODE -ne 0 ]; then
            exit $ERROR_CODE
        fi
    done

    echo "Wrote checksums: $YADM_CHECKSUMS (SHA-512/256)"
else
    echo
    echo "WARNING: command \"shasum\" not found.  No checksums were created."
    exit $YADM_HOOK_EXIT
fi

# return exit status of the yadm command
exit $YADM_HOOK_EXIT