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101 lines
3.1 KiB
101 lines
3.1 KiB
#!/usr/bin/env bash
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# yadm - Yet Another Dotfiles Manager
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# Copyright (C) 2015-2021 Tim Byrne and Martin Zuther
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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YADM_CHECKSUMS="$YADM_HOOK_DIR/files.checksums"
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WARNING_MESSAGE="Checksums were not verified"
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# unpack exported array; filenames including a newline character (\n)
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# are NOT supported
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OLD_IFS="$IFS"
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IFS=$'\n'
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YADM_ENCRYPT_INCLUDE_FILES=( $YADM_ENCRYPT_INCLUDE_FILES )
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IFS="$OLD_IFS"
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function get_checksum_command {
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# check if "shasum" exists and supports the algorithm (which is
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# tested by sending an empty string to "shasum")
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if command -v "shasum" > /dev/null && printf "" | shasum --algorithm "256" &> /dev/null; then
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printf "shasum --algorithm 256"
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# check if "sha256sum" exists
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elif command -v "sha256sum" > /dev/null; then
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printf "sha256sum"
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# check if "gsha256sum" exists
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elif command -v "gsha256sum" > /dev/null; then
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printf "gsha256sum"
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else
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# display warning in bright yellow
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printf "\033[1;33m" >&2
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printf "\nWARNING: \"shasum\", \"sha256sum\" and \"gsha256sum\" not found. %s\n" "$WARNING_MESSAGE." >&2
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# reset output color
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printf "\033[0m" >&2
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# signal error
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return 1
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fi
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}
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# if there is no checksum file, exit with original status of yadm
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# command
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if [ ! -f "$YADM_CHECKSUMS" ]; then
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exit "$YADM_HOOK_EXIT"
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fi
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# get checksum command
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CHECKSUM_COMMAND=$(get_checksum_command)
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# no command found
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if (($?)); then
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# return original exit status of yadm command
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exit "$YADM_HOOK_EXIT"
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fi
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# check encrypted files for differences and capture output and error
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# messages
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YADM_CHECKSUM_OUTPUT=$($CHECKSUM_COMMAND --check "$YADM_CHECKSUMS" 2>&1)
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ERROR_CODE=$?
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# handle mismatched checksums and errors
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if (($ERROR_CODE)); then
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printf "\nSome SHA-256 sums do not match (or an error occurred):\n\n"
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# display differing files and errors (highlighted in red)
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printf "\033[0;31m"
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while IFS= read -r line; do
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# beautify output and get rid of unnecessary lines
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line="${line%%*: [Oo][Kk]}"
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line="${line%%: [Ff][Aa][Ii][Ll][Ee][Dd]}"
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line="${line##*WARNING:*did NOT match}"
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if [ -n "$line" ]; then
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printf "%s\n" "$line"
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fi
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done <<< "$YADM_CHECKSUM_OUTPUT"
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# reset output color
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printf "\033[0m"
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# display advice for differing files and signal error
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printf "\nConsider running either \"yadm encrypt\" or \"yadm decrypt\".\n"
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exit $ERROR_CODE
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fi
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