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#!/usr/bin/env bash
# yadm - Yet Another Dotfiles Manager
# Copyright (C) 2015-2021 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_CHECKSUMS="$YADM_HOOK_DIR/files.checksums"
WARNING_MESSAGE="Checksums were not verified"
# unpack exported array; filenames including a newline character (\n)
# are NOT supported
OLD_IFS="$IFS"
IFS=$'\n'
YADM_ENCRYPT_INCLUDE_FILES=( $YADM_ENCRYPT_INCLUDE_FILES )
IFS="$OLD_IFS"
function get_checksum_command {
# check if "shasum" exists and supports the algorithm (which is
# tested by sending an empty string to "shasum")
if command -v "shasum" > /dev/null && printf "" | shasum --algorithm "256" &> /dev/null; then
printf "shasum --algorithm 256"
# check if "sha256sum" exists
elif command -v "sha256sum" > /dev/null; then
printf "sha256sum"
# check if "gsha256sum" exists
elif command -v "gsha256sum" > /dev/null; then
printf "gsha256sum"
else
# display warning in bright yellow
printf "\033[1;33m" >&2
printf "\nWARNING: \"shasum\", \"sha256sum\" and \"gsha256sum\" not found. %s\n" "$WARNING_MESSAGE." >&2
# reset output color
printf "\033[0m" >&2
# signal error
return 1
fi
}
# if there is no checksum file, exit with original status of yadm
# command
if [ ! -f "$YADM_CHECKSUMS" ]; then
exit "$YADM_HOOK_EXIT"
fi
# get checksum command
CHECKSUM_COMMAND=$(get_checksum_command)
# no command found
if (($?)); then
# return original exit status of yadm command
exit "$YADM_HOOK_EXIT"
fi
# check encrypted files for differences and capture output and error
# messages
YADM_CHECKSUM_OUTPUT=$($CHECKSUM_COMMAND --check "$YADM_CHECKSUMS" 2>&1)
ERROR_CODE=$?
# handle mismatched checksums and errors
if (($ERROR_CODE)); then
printf "\nSome SHA-256 sums do not match (or an error occurred):\n\n"
# display differing files and errors (highlighted in red)
printf "\033[0;31m"
while IFS= read -r line; do
# beautify output and get rid of unnecessary lines
line="${line%%*: [Oo][Kk]}"
line="${line%%: [Ff][Aa][Ii][Ll][Ee][Dd]}"
line="${line##*WARNING:*did NOT match}"
if [ -n "$line" ]; then
printf "%s\n" "$line"
fi
done <<< "$YADM_CHECKSUM_OUTPUT"
# reset output color
printf "\033[0m"
# display advice for differing files and signal error
printf "\nConsider running either \"yadm encrypt\" or \"yadm decrypt\".\n"
exit $ERROR_CODE
fi
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