407 lines
16 KiB
Bash
Executable File
407 lines
16 KiB
Bash
Executable File
#!/bin/bash
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# Copyright © 2022 Matthias Quintern.
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# This software comes with no warranty.
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# This software is licensed under the GPL3
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# ABOUT
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# Synchronizes files from a sender to a receiver using rsync
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# The files can be encrypted before or decrypted after the transfer using the mkrypt script
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# SETTINGS
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# The directory that is searched for config files, use ~/.config if $XDG_CONFIG_HOME is not defined
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[[ -z $XDG_CONFIG_HOME ]] && XDG_CONFIG_HOME=~/.config
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CONFIG_DIR=$XDG_CONFIG_HOME/msynk/
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# When using encrypt/decrypt, the source is en/decrypted to TMP_DIR and then rsynced to receiver from there
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# Path must contain 'msynk'
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TMP_DIR=/tmp/msynk/
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# When using --delete, this file is used to determine the files that will be deleted
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TMP_FILE=/tmp/msynk_file
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# Path to the mkrypt script
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mkrypt=/usr/bin/mkrypt
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# Additional flags for mkrypt
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mkrypt_flags=()
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rsync_flags=(-ruh)
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# rsync_flags+=(--rsh="ssh -p 42")
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# r - relative
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# v - verbose
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# Ut - preserve modification&access times
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# u - update, skip files that are newer on the receiver
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# P - show progress and keep partially transferred files
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# h - human readable
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# see "man rsync" for more
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# expand * to hidden files as well
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shopt -s dotglob
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# UTILITY
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FMT_MESSAGE="\e[1;34m%s\e[0m %s\n"
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FMT_ERROR="\e[1;31mmsync ERROR: \e[0m%s\n"
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# exit 1: error, exit 2: rsync exited non 0, exit 3: mkrypt exited non 0
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FMT_SYNC="\e[1;32mSyncing: \e[0m%s\n"
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FMT_CONFIG="\e[34m%s\e:\t\e[1;33m%s\e[0m\n"
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FMT_CMD="\e[1;33mRunning: \e[0m%s\n"
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# FUNCTIONS
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# silence commands
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quiet() { "$@" > /dev/null 2>&1; }
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# check if a passed parameter is contained in file
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# path must be set before calling
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check_path_in_args()
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{
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if [ $all = 1 ]; then
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return 0
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fi
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for string in ${paths_2[@]}; do
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if [[ $path == *$string* ]]; then
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if [[ $exclude = 1 ]]; then
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return 1
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else
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return 0
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fi
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fi
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done
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if [[ $exclude = 1 ]]; then
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return 0
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else
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return 1
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fi
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}
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# SYNC SENDER TO RECEIVER
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sync_sender_to_receiver()
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{
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# perform a dry run to see which files would be deleted
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if [[ -n $delete && -z $skip_dryrun ]]; then
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[[ $v -ge 1 ]] && printf "$FMT_MESSAGE" "Performing dryrun" "to generate list of files that will be deleted from $receiver..."
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echo "" > $TMP_FILE
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for path in "${filtered_paths[@]}"; do
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dest_subdir=$receiver$(basename $path)
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rsync $rsync_flags -v --dry-run --delete $path $dest_subdir | grep deleting | sed "s(deleting (${BACKUP_SUBDIR}/(" >> $TMP_FILE
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done
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# print files that will be deleted and ask if continue
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# grep deleting $TMP_FILE | sed "s(deleting (${receiver}/(" | less
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less $TMP_FILE
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printf "$FMT_MESSAGE" "The listed files will be deleted from $receiver."
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printf "Proceed?\e[34m (y/n)\e[0m: "
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read answer
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case $answer in
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y|Y)
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# printf "$FMT_MESSAGE" "Backing up to $receiver..."
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;;
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*)
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printf "$FMT_MESSAGE" "Cancelled."
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exit 0 ;;
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esac
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fi
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# actual syncing
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for path in "${filtered_paths[@]}"; do
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[[ $v -ge 1 ]] && printf "$FMT_SYNC" "$path"
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if [[ -d "$path" ]]; then
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dest="$receiver"$(basename "$path")
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elif [[ -f $path ]]; then
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dest="$receiver"
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elif [[ "$sender" == *:* ]]; then # if sender is remote, assume the path is a dir if it has a slash and a file otherwise
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[[ "$path" == *"/" ]] && dest="$receiver"$(basename "$path") || dest="$receiver"
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else
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printf "$FMT_ERROR" "Invalid path: $path"; exit 1
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fi
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if [[ -n $encrypt || -n $decrypt ]]; then
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mkdir -p "$TMP_DIR"
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tmp_source="$TMP_DIR"
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if [[ -n $encrypt ]]; then
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# check if TMP_DIR has enough space
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tmp_free=$(df --output=avail $TMP_DIR | grep -E "[[:digit:]]+")
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path_size=$(du -s "$path" | sed -e "s/[^0-9]//g")
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if [[ $tmp_free -le $path_size ]]; then
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printf "$FMT_ERROR" "Not enough space on $TMP_DIR to copy $path! $TMP_DIR $tmp_free free - Size $path: $path_size"
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printf "$FMT_MESSAGE" "" "If using a tmpfs, you can increase its size by running: 'sudo mount -o remount,size=XXG,noatime /tmp' to increase the size to XXG (You will need a large enough swap space)"
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exit 1
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fi
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[[ -f "$path" ]] && tmp_source="$TMP_DIR"$(basename "$path").gpg
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[[ $v -ge 3 ]] && printf "$FMT_CMD" "bash $mkrypt --encrypt $path --output $TMP_DIR ${mkrypt_flags[*]}"
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bash $mkrypt --encrypt "$path" --output "$TMP_DIR" ${mkrypt_flags[@]} || exit 3
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[[ $v -ge 3 ]] && printf "$FMT_CMD" "rsync ${rsync_flags[*]} $tmp_source $dest"
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rsync "${rsync_flags[@]}" "$tmp_source" "$dest" || { printf "$FMT_ERROR" "rsync exited with exit code $?"; exit 2; }
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else
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[[ -f $path ]] && tmp_source=$TMP_DIR$(basename $path)
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[[ $v -ge 3 ]] && printf "$FMT_CMD" "rsync ${rsync_flags[*]} $path $TMP_DIR"
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rsync "${rsync_flags[@]}" "$path" "$TMP_DIR" || { printf "$FMT_ERROR" "rsync exited with exit code $?"; exit 2; }
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[[ $v -ge 3 ]] && printf "$FMT_CMD" "bash $mkrypt --decrypt $tmp_source --output $(readlink -f $dest) ${mkrypt_flags[*]}"
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bash $mkrypt --decrypt "$tmp_source" --output "$(readlink -f "$dest")" ${mkrypt_flags[@]} || exit 3
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fi
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else
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[[ $v -ge 3 ]] && printf "$FMT_CMD" "rsync ${rsync_flags[*]} $delete $path $dest"
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rsync "${rsync_flags[@]}" $delete "$path" "$dest" || { printf "$FMT_ERROR" "rsync exited with exit code $?"; exit 2; }
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fi
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[[ "$TMP_DIR" == *msynk* ]] && {
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rm -rf "$TMP_DIR"/* || { printf "$FMT_ERROR" "Can not delete contents of \$TMP_DIR: $TMP_DIR"; exit 1; }
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} || { printf "$FMT_ERROR" "Will not delete \$TMP_DIR because it might be dangerous (path does not contain 'msynk'): $TMP_DIR"; exit 1; }
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done
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# put todays date in the config
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if [[ -f $CONFIG_DIR/$config ]]; then
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if grep -xq "date=.*" $CONFIG_DIR$config; then
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[[ $v -ge 2 ]] && printf "$FMT_MESSAGE" "Updating" "date in $CONFIG_DIR$config."
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sed "s/date=.*/date=\"$(date --iso=sec)\"/" $CONFIG_DIR$config -i
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else
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[[ $v -ge 2 ]] && printf "$FMT_MESSAGE" "Writing" "current date to $CONFIG_DIR$config."
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echo "date=\"$(date --iso=sec)\"" >> $CONFIG_DIR$config
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fi
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fi
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[[ $v -ge 2 ]] && printf "$FMT_MESSAGE" "Running:" "'sync' to write cached writes to persistent storage"
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sync
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[[ $v -ge 1 ]] && printf "$FMT_MESSAGE" "Done!"
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}
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# HELP
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show_help()
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{
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printf "\e[33mArgument Short Action:\e[0m
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--help -h Show this.
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--settings -s Show current settings.
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--config [name] -c [name] Use sender, receiver, paths from config file with [name].
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--show-config [name] Print variables defined by a config with [name].
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--sender [path] -s [path] Sender directory, with trailing slash! Defaults to the current working directory.
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--receiver [path] -r [path] Receiver directory, with trailing slash!.
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--reverse Swap receiver and sender.
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--encrypt Encrypt files before syncing.
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--decrypt Decrypt files before syncing.
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--check-date Only process files that have been modified since the program was last run. Needs -c and (--encrypt/--decrypt).
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--mkrypt-flag [arg] Additional argument for mkrypt.
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--delete -d Delete files that exist on receiver, but not on sender. Does not work with --encrypt/--decrypt.
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--skip-dryrun Delete without asking first.
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--rsync-flag [arg] Additional argument for rsync.
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--verbose -v Increase verbosity.
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--silent Decrease verbosity.
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--debug Maximum verbosity.
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--exclude Interpret positional arguments as blacklist
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Positional arguments are:
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- if using a config: a string that must be in the configs paths: eg. 'foo' will include ~/foo but not ~/bar
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- if not using a config: paths to sync (must be relative to --sender)
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See the manpage for more information.
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"
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}
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# SETTINGS
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show_settings()
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{
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printf "\e[1mThe current settings are:\e[0m\n"
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printf "$FMT_CONFIG" "\$TMP_DIR " "$TMP_DIR"
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printf "$FMT_CONFIG" "\$TMP_FILE " "$TMP_FILE"
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printf "$FMT_CONFIG" "\$CONFIG_DIR " "$CONFIG_DIR"
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[[ -f $mkrypt ]] || mkrypt_installed="(file not found)"
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printf "$FMT_CONFIG" "\$mkrypt " "$mkrypt $mkrypt_installed"
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printf "$FMT_CONFIG" "\$rsync_flags " "${rsync_flags[*]}"
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}
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show_config()
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{
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[[ ! -f $CONFIG_DIR$config ]] && { printf "$FMT_ERROR" "Invalid path: $CONFIG_DIR$config"; exit 1; }
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source $CONFIG_DIR$config
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printf "\e[1m$CONFIG_DIR$config:\e[0m\n"
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printf "$FMT_CONFIG" "\$sender " "$sender"
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printf "$FMT_CONFIG" "\$receiver " "$receiver"
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printf "$FMT_CONFIG" "\$paths " "${paths[*]}"
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printf "$FMT_CONFIG" "\$use_encryption " "$use_encryption"
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printf "$FMT_CONFIG" "Last run: $date"
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}
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# PARSE ARGS
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if [ -z $1 ]; then
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show_help
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exit 0
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fi
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all=1
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paths_2=()
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while (( "$#" )); do
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case "$1" in
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-h|--help)
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show_help
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exit 0 ;;
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--settings)
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show_settings
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exit 0 ;;
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-c|--config)
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if [[ -n $2 && ${2:0:1} != "-" ]]; then
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config=$2
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shift 2
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else printf "$FMT_ERROR" "Missing argument for $1"; exit 1; fi ;;
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--show-config)
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if [[ -n $2 && ${2:0:1} != "-" ]]; then
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config=$2
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show_config
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exit 0
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else printf "$FMT_ERROR" "Missing argument for $1"; exit 1; fi ;;
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-s|--sender)
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if [[ -n $2 && ${2:0:1} != "-" ]]; then
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sender_2=$2
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shift 2
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else printf "$FMT_ERROR" "Missing argument for $1"; exit 1; fi ;;
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-r|--receiver)
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if [[ -n $2 && ${2:0:1} != "-" ]]; then
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receiver_2=$2
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shift 2
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else printf "$FMT_ERROR" "Missing argument for $1"; exit 1; fi ;;
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--reverse)
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reverse=1
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shift ;;
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--encrypt)
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encrypt=1
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use_encryption=1
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shift ;;
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--decrypt)
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decrypt=1
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use_encryption=1
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shift;;
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-d|--delete)
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delete=--delete
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shift ;;
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--skip-dryrun)
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skip_dryrun=1
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shift ;;
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--rsync-flag)
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if [[ -n ${2} ]]; then # && "${2:0:1}" != "-" ]]; then # possibly problematic if $2 is an msynk flag
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rsync_flags+=("${2}")
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shift 2
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else printf "$FMT_ERROR" "Missing argument for $1"; exit 1; fi ;;
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--check-date)
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check_date=1
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shift ;;
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--mkrypt-flag)
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if [[ -n ${2} ]]; then # && "${2:0:1}" != "-" ]]; then # possibly problematic if $2 is an msynk flag
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mkrypt_flags+=("${2}")
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shift 2
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else printf "$FMT_ERROR" "Missing argument for $1"; exit 1; fi ;;
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-v|--verbose)
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v=2
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rsync_flags+=(-v)
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mkrypt_flags+=(-v)
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shift ;;
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--silent)
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v=0
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mkrypt_flags+=(--silent)
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shift ;;
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--debug)
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v=3
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rsync_flags+=(-v)
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mkrypt_flags+=(-v)
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shift;;
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--exclude)
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exclude=1
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shift ;;
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-*|--*=) # unsupported flags
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printf "$FMT_ERROR" "Unsupported flag $1" >&2
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exit 1 ;;
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*) # everything that does not have a - is interpreted as filepath
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all=0
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paths_2+=($1)
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shift ;;
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esac
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done
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# PREPARATION & CHECKS
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# clear $TMP_DIR: might be non-empty if previous msynk failed
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[[ $TMP_DIR == *msynk* ]] && {
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rm -rf $TMP_DIR/* || { printf "$FMT_ERROR" "Can not contents of \$TMP_DIR: $TMP_DIR"; exit 1; }
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} || { printf "$FMT_ERROR" "Will not delete \$TMP_DIR because it might be dangerous (path does not contain 'msynk'): $TMP_DIR"; exit 1; }
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# check if rsync is installed
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if ! command -v rsync &> /dev/null; then
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printf "$FMT_ERROR" "rsync is not installed."
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exit 1
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fi
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# if using encryption, check if mkrypt is installed
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[[ $use_encryption = 1 && ! -f $mkrypt ]] && { printf "$FMT_ERROR" "Can not use encryption: mkrypt is not installed at given path: $mkrypt."; exit 1; }
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# if using a config
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if [[ -n $config ]]; then
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source $CONFIG_DIR$config || { printf "$FMT_ERROR" "Error running the config file: $CONFIG_DIR$config"; exit 1; }
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if [[ $use_encryption = 1 ]]; then
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[[ -z $reverse ]] && encrypt=1 || decrypt=1
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fi
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[[ $v -ge 3 ]] && printf "$FMT_MESSAGE" "Loaded config:" "$CONFIG_DIR$config: date:$date sender:$sender receiver:$receiver use_encryption:$use_encryption encrypt:$encrypt decrypt:$decrypt paths:${paths[*]}"
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fi
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# overwrite stuff from the config if anything else was given / set variables of no config was given
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[[ -n $sender_2 ]] && sender=$sender_2
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[[ -n $receiver_2 ]] && receiver=$receiver_2
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[[ -z $sender ]] && {
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[[ $v -ge 1 ]] && printf "$FMT_MESSAGE" "Missing sender:" "Using working directory: $(pwd)"
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sender="$(pwd)/"
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}
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# reverse: swap sender and reveiver
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if [[ -n $reverse ]]; then
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tmp_sender=$sender
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sender=$receiver
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receiver=$tmp_sender
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fi
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# make sure receiver has trailing slash
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[[ $receiver != *"/" ]] && receiver=$receiver"/"
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# create receiver dir if its local
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[[ ! $receiver == *:* ]] && { mkdir -p $receiver || { printf "$FMT_ERROR" "Can not create receiver directory: $receiver"; exit 1; }; }
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[[ $v -ge 3 ]] && printf "$FMT_MESSAGE" "Variables:" "sender:$sender receiver:$receiver paths:${paths[*]} paths_2:${paths_2[*]}"
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# filter paths:
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# - if using config: all paths from config that have a pos.arg in them
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# - else: pos.args, must be relative to specified --sender
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filtered_paths=()
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ifs=$IFS
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IFS=$'\n'
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if [[ -n $config ]]; then
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[[ $sender != *"/" ]] && sender=$sender"/"
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for path in "${paths[@]}"; do
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if check_path_in_args; then
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# if reverse and encryption (use_encryption might be overwritten by config when --decrypt is used) and file, it will have a .gpg extension
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[[ -n $reverse && ($use_encryption = 1 || $decrypt = 1) && "$path" != *"/" ]] && path="$path".gpg
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filtered_paths+=("$sender$path")
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fi
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done
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else
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for path in ${paths_2[@]}; do # add slash if directory
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[[ -d "$path" ]] && [[ "$path" != *"/" ]] && path="$path/"
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filtered_paths+=("$sender$path")
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done
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fi
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[[ $v -ge 3 ]] && printf "$FMT_MESSAGE" "Filtered paths:" "${filtered_paths[*]}"
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IFS=$ifs
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# sanity checks
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[[ -z $filtered_paths ]] && { printf "$FMT_ERROR" "Missing valid paths."; exit 1; }
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[[ -z $receiver ]] && { printf "$FMT_ERROR" "Missing receiver. Specifiy with --receiver"; exit 1; }
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[[ -n $delete && ( -n $decrypt || -n $encrypt ) ]] && { printf "$FMT_ERROR" "Can not use --delete and encryption at the same time."; exit 1; }
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# if using --check-date
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if [[ -n $check_date && -z $date ]]; then # if --check-date but date is not set, use 0 (unix time)
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[[ $v -ge 1 ]] && printf "$FMT_MESSAGE" "--check-date:" "passed but date not set in config, using 0 (unix time)"
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date=$(date --iso=sec -d @0)
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fi
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[[ -n $check_date ]] && { mkrypt_flags+=(--check-date "${date}"); rsync_flags+=(--times); }
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# RUN!
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sync_sender_to_receiver
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exit 0
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