89 lines
2.3 KiB
Bash
Executable file
89 lines
2.3 KiB
Bash
Executable file
#!/usr/bin/env bash
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# yadm - Yet Another Dotfiles Manager
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# Copyright (C) 2015-2019 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_DIRECTORY=$(dirname "$YADM_HOOK_REPO")
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YADM_CHECKSUMS=$YADM_DIRECTORY/files.checksums
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# unpack exported array; filenames including a newline character (\n)
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# are NOT supported
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OLD_IFS="$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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CHECKSUM_ALGORITHM="512"
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CHECKSUM_ALGORITHM_NAME="SHA-512"
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WARNING_MESSAGE="No checksums were created."
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function print_warning_and_exit {
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MESSAGE=$1
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# set output color to yellow
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echo -e "\033[1;33m"
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echo "WARNING: $MESSAGE $WARNING_MESSAGE"
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# reset output color
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echo -e "\033[0m"
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exit "$YADM_HOOK_EXIT"
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}
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function ensure_command {
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COMMAND_NAME=$1
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# check if command exists
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if ! command -v "$COMMAND_NAME" > /dev/null; then
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print_warning_and_exit "command \"$COMMAND_NAME\" not found."
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fi
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}
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function ensure_algorithm {
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# check if "shasum" supports algorithm by hashing an empty string
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echo -n | shasum --algorithm "$CHECKSUM_ALGORITHM" &> /dev/null
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if [ $? -ne 0 ]; then
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print_warning_and_exit "\"shasum\" does not support $CHECKSUM_ALGORITHM_NAME."
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fi
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}
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# check if "shasum" exists and supports algorithm
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ensure_command shasum
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ensure_algorithm
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# empty checksum file
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echo -n > "$YADM_CHECKSUMS"
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# calculate checksums for encrypted files
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for included in ${YADM_ENCRYPT_INCLUDE_FILES[*]}; do
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shasum --algorithm $CHECKSUM_ALGORITHM "$included" >> "$YADM_CHECKSUMS"
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# signal errors
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if [ $? -ne 0 ]; then
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exit $?
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fi
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done
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echo "Wrote checksums: $YADM_CHECKSUMS ($CHECKSUM_ALGORITHM_NAME)"
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# return exit status of the yadm command
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exit "$YADM_HOOK_EXIT"
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