├── LICENSE ├── README.md ├── btrfs-sync └── resources └── btrfs-sync.gif /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. By contrast, 15 | the GNU General Public License is intended to guarantee your freedom to 16 | share and change all versions of a program--to make sure it remains free 17 | software for all its users. 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It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # btrfs-sync 2 | 3 | Smart and easy sync of BTRFS snapshots, locally or through SSH. 4 | 5 | ![Example](resources/btrfs-sync.gif) 6 | 7 | Can be used in conjunction with [btrfs-snp](https://ownyourbits.com/2017/12/27/schedule-btrfs-snapshots-with-btrfs-snp/) 8 | 9 | ``` 10 | # btrfs-sync --verbose --delete /home/user/.snapshots user@server:/media/USBdrive/home-snapshots 11 | * Skip existing '/home/user/.snapshots/monthly_2018-01-09_200102' 12 | * Skip existing '/home/user/.snapshots/monthly_2018-02-08_200102' 13 | * Skip existing '/home/user/.snapshots/weekly_2018-02-09_140102' 14 | * Skip existing '/home/user/.snapshots/weekly_2018-02-16_150102' 15 | * Skip existing '/home/user/.snapshots/weekly_2018-02-23_150102' 16 | * Skip existing '/home/user/.snapshots/weekly_2018-03-02_180102' 17 | * Skip existing '/home/user/.snapshots/daily_2018-03-03_000101' 18 | * Skip existing '/home/user/.snapshots/daily_2018-03-04_080101' 19 | * Skip existing '/home/user/.snapshots/daily_2018-03-05_100102' 20 | * Skip existing '/home/user/.snapshots/daily_2018-03-06_100102' 21 | * Skip existing '/home/user/.snapshots/daily_2018-03-07_110102' 22 | * Synchronizing '/home/user/.snapshots/hourly_2018-03-08_090101' using seed '.snapshots/hourly_2018-03-07_090101'... 23 | time elapsed [0:00:24] | rate [11.1MiB/s] | total size [ 132MiB] 24 | * Synchronizing '/home/user/.snapshots/hourly_2018-03-08_100101' using seed '.snapshots/hourly_2018-03-09_090101'... 25 | time elapsed [0:01:05] | rate [11.1MiB/s] | total size [ 275MiB] 26 | * Deleting non existent snapshots... 27 | Delete subvolume (no-commit): '/media/USBdrive/home-snapshots/hourly_2018-03-08_090101' 28 | Delete subvolume (no-commit): '/media/USBdrive/home-snapshots/hourly_2018-03-08_100101' 29 | ``` 30 | 31 | ## Features 32 | 33 | - Simple syntax 34 | - Progress indication 35 | - Support for _xz_ or _pbzip2_ compression in order to save bandwidth. 36 | - Retention policy 37 | - Automatic incremental synchronization 38 | - Cron friendly 39 | 40 | ## Usage 41 | 42 | The syntax is similar to that of _scp_ 43 | 44 | ``` 45 | Usage: 46 | btrfs-sync [options] [...] [[user@]host:] 47 | 48 | -k|--keep NUM keep only last sync'ed snapshots 49 | -d|--delete delete snapshots in that don't exist in 50 | -z|--xz use xz compression. Saves bandwidth, but uses one CPU 51 | -Z|--pbzip2 use pbzip2 compression. Saves bandwidth, but uses all CPUs 52 | -q|--quiet don't display progress 53 | -v|--verbose display more information 54 | -h|--help show usage 55 | 56 | can either be a single snapshot, or a folder containing snapshots 57 | requires privileged permissions at for the 'btrfs' command 58 | ``` 59 | 60 | ## Examples 61 | 62 | ### Manual 63 | 64 | Synchronize snapshots of _home_ to a USB drive 65 | 66 | ``` 67 | # btrfs-sync /home/user/.snapshots /media/USBdrive/home-snapshots 68 | ``` 69 | 70 | Synchronize snapshots of _home_ to a USB drive in another machine 71 | 72 | ``` 73 | # btrfs-sync /home/user/.snapshots user@server:/media/USBdrive/home-snapshots 74 | ``` 75 | 76 | Synchronize one snapshot of _home_ to a USB drive in another machine 77 | 78 | ``` 79 | # btrfs-sync /home/user/.snapshots/monthly_2018-02-08_200102 user@server:/media/USBdrive/home-snapshots 80 | ``` 81 | 82 | Synchronize only monthly snapshots of _home_ to a USB drive in another machine 83 | 84 | ``` 85 | # btrfs-sync /home/user/.snapshots/monthly_* user@server:/media/USBdrive/home-snapshots 86 | ``` 87 | 88 | ### Cron 89 | 90 | Daily synchronization over the internet, keep only last 50 91 | 92 | ``` 93 | cat > /etc/cron.daily/btrfs-sync < /etc/cron.daily/btrfs-sync < [...] [[user@]host:] 9 | # 10 | # -k|--keep NUM keep only last sync'ed snapshots 11 | # -d|--delete delete snapshots in that don't exist in 12 | # -z|--xz use xz compression. Saves bandwidth, but uses one CPU 13 | # -Z|--pbzip2 use pbzip2 compression. Saves bandwidth, but uses all CPUs 14 | # -q|--quiet don't display progress 15 | # -v|--verbose display more information 16 | # -h|--help show usage 17 | # 18 | # can either be a single snapshot, or a folder containing snapshots 19 | # requires privileged permissions at for the 'btrfs' command 20 | # 21 | # Cron example: daily synchronization over the internet, keep only last 50 22 | # 23 | # cat > /etc/cron.daily/btrfs-sync < 30 | # GPL licensed (see end of file) * Use at your own risk! 31 | # 32 | # More at https://ownyourbits.com 33 | # 34 | 35 | set -e -o pipefail 36 | 37 | # help 38 | print_usage() { 39 | echo "Usage: 40 | $BIN [options] [[user@]host:] [...] [[user@]host:] 41 | 42 | -k|--keep NUM keep only last sync'ed snapshots 43 | -d|--delete delete snapshots in that don't exist in 44 | -z|--xz use xz compression. Saves bandwidth, but uses one CPU 45 | -Z|--pbzip2 use pbzip2 compression. Saves bandwidth, but uses all CPUs 46 | -p|--port SSH port. Default 22 47 | -q|--quiet don't display progress 48 | -v|--verbose display more information 49 | -h|--help show usage 50 | 51 | can either be a single snapshot, or a folder containing snapshots 52 | requires privileged permissions at for the 'btrfs' command 53 | 54 | Cron example: daily synchronization over the internet, keep only last 50 55 | 56 | cat > /etc/cron.daily/btrfs-sync </dev/null ) 80 | [[ $? -ne 0 ]] && { echo "error parsing arguments"; exit 1; } 81 | eval set -- "$OPTS" 82 | 83 | while true; do 84 | case "$1" in 85 | -h|--help ) print_usage; exit 0 ;; 86 | -q|--quiet ) QUIET=1 ; shift 1 ;; 87 | -d|--delete ) DELETE=1 ; shift 1 ;; 88 | -k|--keep ) KEEP=$2 ; shift 2 ;; 89 | -p|--port ) PORT=$2 ; shift 2 ;; 90 | -z|--xz ) ZIP=xz PIZ=( xz -d ); shift 1 ;; 91 | -Z|--pbzip2 ) ZIP=pbzip2 PIZ=( pbzip2 -d ); shift 1 ;; 92 | -v|--verbose) SILENT="" VERBOSE=1 ; shift 1 ;; 93 | --) shift; break ;; 94 | esac 95 | done 96 | 97 | SRC=( "${@:1:$#-1}" ) 98 | DST="${@: -1}" 99 | 100 | # detect remote src argument 101 | [[ "$SRC" =~ : ]] && { 102 | NET_SRC="$( sed 's|:.*||' <<<"$SRC" )" 103 | SRC="$( sed 's|.*:||' <<<"$SRC" )" 104 | SSH_SRC=( ssh -p "$PORT" -o ServerAliveInterval=5 -o ConnectTimeout=1 -o BatchMode=yes "$NET_SRC" ) 105 | } 106 | 107 | [[ "$SSH_SRC" != "" ]] && SRC_CMD=( ${SSH_SRC[@]} ) || SRC_CMD=( eval ) 108 | ${SRC_CMD[@]} test -x "$SRC" &>/dev/null || { 109 | [[ "$SSH_SRC" != "" ]] && echo "SSH access error to $NET_SRC. Do you have passwordless login setup, and adequate permissions for $SRC?" 110 | [[ "$SSH_SRC" == "" ]] && echo "Access error. Do you have adequate permissions for $SRC?" 111 | exit 1 112 | } 113 | 114 | # detect remote dst argument 115 | [[ "$DST" =~ : ]] && { 116 | NET="$( sed 's|:.*||' <<<"$DST" )" 117 | DST="$( sed 's|.*:||' <<<"$DST" )" 118 | SSH=( ssh -p "$PORT" -o ServerAliveInterval=5 -o ConnectTimeout=1 -o BatchMode=yes "$NET" ) 119 | } 120 | [[ "$SSH" != "" ]] && DST_CMD=( ${SSH[@]} ) || DST_CMD=( eval ) 121 | ${DST_CMD[@]} test -x "$DST" &>/dev/null || { 122 | [[ "$SSH" != "" ]] && echo "SSH access error to $NET. Do you have passwordless login setup, and adequate permissions for $DST?" 123 | [[ "$SSH" == "" ]] && echo "Access error. Do you have adequate permissions for $DST?" 124 | exit 1 125 | } 126 | 127 | #---------------------------------------------------------------------------------------------------------- 128 | 129 | # more checks 130 | 131 | ## don't overlap 132 | pgrep -F /run/btrfs-sync.pid &>/dev/null && { echo "$BIN is already running"; exit 1; } 133 | echo $$ > /run/btrfs-sync.pid 134 | 135 | ${DST_CMD[@]} "pgrep -f btrfs\ receive &>/dev/null" && { echo "btrfs-sync already running at destination"; exit 1; } 136 | 137 | ## src checks 138 | echov "* Check source" 139 | while read entry; do SRCS+=( "$entry" ); done < <( 140 | "${SRC_CMD[@]}" " 141 | for s in "${SRC[@]}"; do 142 | src=\"\$(cd \"\$s\" &>/dev/null && pwd)\" || { echo \"\$s not found\"; exit 1; } #abspath 143 | btrfs subvolume show \"\$src\" &>/dev/null && echo \"0|\$src\" || \ 144 | for dir in \$( ls -drt \"\$src\"/* 2>/dev/null ); do 145 | DATE=\"\$( btrfs su sh \"\$dir\" 2>/dev/null | grep \"Creation time:\" | awk '{ print \$3, \$4 }' )\" \ 146 | || continue # not a subvolume 147 | SECS=\$( date -d \"\$DATE\" +\"%s\" ) 148 | echo \"\$SECS|\$dir\" 149 | done 150 | done | sort -V | sed 's=.*|==' 151 | " 152 | ) 153 | [[ ${#SRCS[@]} -eq 0 ]] && { echo "no BTRFS subvolumes found"; exit 1; } 154 | 155 | ## check pbzip2 156 | [[ "$ZIP" == "pbzip2" ]] && { 157 | "${SRC_CMD[@]}" type pbzip2 &>/dev/null && \ 158 | "${DST_CMD[@]}" type pbzip2 &>/dev/null || { 159 | echo "INFO: 'pbzip2' not installed on both ends, fallback to 'xz'" 160 | ZIP=xz PIZ=unxz 161 | } 162 | } 163 | 164 | ## use 'pv' command if available 165 | PV=( pv -F"time elapsed [%t] | rate %r | total size [%b]" ) 166 | [[ "$QUIET" == "1" ]] && PV=( cat ) || type pv &>/dev/null || { 167 | echo "INFO: install the 'pv' package in order to get a progress indicator" 168 | PV=( cat ) 169 | } 170 | 171 | #---------------------------------------------------------------------------------------------------------- 172 | 173 | # sync snapshots 174 | 175 | get_dst_snapshots() { # sets DSTS DST_UUIDS 176 | local DST="$1" 177 | unset DSTS DST_UUIDS 178 | while read entry; do 179 | DST_UUIDS+=( "$( sed 's=|.*==' <<<"$entry" )" ) 180 | DSTS+=( "$( sed 's=.*|==' <<<"$entry" )" ) 181 | done < <( 182 | "${DST_CMD[@]}" " 183 | DSTS=( \$( ls -d \"$DST\"/* 2>/dev/null ) ) 184 | for dst in \${DSTS[@]}; do 185 | UUID=\$( sudo btrfs su sh \"\$dst\" 2>/dev/null | grep 'Received UUID' | awk '{ print \$3 }' ) 186 | [[ \"\$UUID\" == \"-\" ]] || [[ \"\$UUID\" == \"\" ]] && continue 187 | echo \"\$UUID|\$dst\" 188 | done" 189 | ) 190 | } 191 | 192 | choose_seed() { # sets SEED 193 | local SRC="$1" 194 | 195 | SEED="$SEED_NEXT" 196 | if [[ "$SEED" == "" ]]; then 197 | # try to get most recent src snapshot that exists in dst to use as a seed 198 | local RXID_CALCULATED=0 199 | declare -A PATH_RXID DATE_RXID SHOWP RXIDP DATEP 200 | local LIST="$( "${SRC_CMD[@]}" sudo btrfs subvolume list -su "$SRC" )" 201 | SEED=$( 202 | for id in "${DST_UUIDS[@]}"; do 203 | # try to match by UUID 204 | local PATH_=$( awk "{ if ( \$14 == \"$id\" ) print \$16 }" <<<"$LIST" ) 205 | local DATE=$( awk "{ if ( \$14 == \"$id\" ) print \$11, \$12 }" <<<"$LIST" ) 206 | 207 | # try to match by received UUID, only if necessary 208 | [[ "$PATH_" == "" ]] && { 209 | [[ "$RXID_CALCULATED" == "0" ]] && { # create table during the first iteration if needed 210 | local PATHS=( $( "${SRC_CMD[@]}" sudo btrfs su list -u "$SRC" | awk '{ print $11 }' ) ) 211 | for p in "${PATHS[@]}"; do 212 | SHOWP="$( "${SRC_CMD[@]}" sudo btrfs su sh "$( dirname "$SRC" )/$( basename "$p" )" 2>/dev/null )" 213 | RXIDP="$( grep 'Received UUID' <<<"$SHOWP" | awk '{ print $3 }' )" 214 | DATEP="$( grep 'Creation time' <<<"$SHOWP" | awk '{ print $3, $4 }' )" 215 | [[ "$RXIDP" == "" ]] && continue 216 | PATH_RXID["$RXIDP"]="$p" 217 | DATE_RXID["$RXIDP"]="$DATEP" 218 | done 219 | RXID_CALCULATED=1 220 | } 221 | PATH_="${PATH_RXID["$id"]}" 222 | DATE="${DATE_RXID["$id"]}" 223 | } 224 | 225 | [[ "$PATH_" == "" ]] || [[ "$PATH_" == "$( basename "$SRC" )" ]] && continue 226 | 227 | local SECS=$( date -d "$DATE" +"%s" ) 228 | echo "$SECS|$PATH_" 229 | done | sort -V | tail -1 | cut -f2 -d'|' 230 | ) 231 | fi 232 | } 233 | 234 | exists_at_dst() { 235 | local SHOW="$( "${SRC_CMD[@]}" sudo btrfs subvolume show "$SRC" )" 236 | 237 | local SRC_UUID="$( grep 'UUID:' <<<"$SHOW" | head -1 | awk '{ print $2 }' )" 238 | grep -q "$SRC_UUID" <<<"${DST_UUIDS[@]}" && return 0; 239 | 240 | local SRC_RXID="$( grep 'Received UUID' <<<"$SHOW" | awk '{ print $3 }' )" 241 | grep -q "^-$" <<<"$SRC_RXID" && return 1; 242 | grep -q "$SRC_RXID" <<<"${DST_UUIDS[@]}" && return 0; 243 | 244 | return 1 245 | } 246 | 247 | ## sync incrementally 248 | sync_snapshot() { 249 | local SRC="$1" 250 | "${SRC_CMD[@]}" test -d "$SRC" || return 251 | 252 | exists_at_dst "$SRC" && { echov "* Skip existing '$SRC'"; return 0; } 253 | 254 | choose_seed "$SRC" # sets SEED 255 | 256 | # incremental sync argument 257 | [[ "$SEED" != "" ]] && { 258 | local SEED_PATH="$( dirname "$SRC" )/$( basename $SEED )" 259 | "${SRC_CMD[@]}" test -d "$SEED_PATH" && 260 | local SEED_ARG=( -p "$SEED_PATH" ) || \ 261 | echo "INFO: couldn't find $SEED_PATH. Non-incremental mode" 262 | } 263 | 264 | # do it 265 | echo -n "* Synchronizing '$src'" 266 | [[ "$SEED_ARG" != "" ]] && echov -n " using seed '$SEED'" 267 | echo "..." 268 | 269 | "${SRC_CMD[@]}" \ 270 | sudo btrfs send -q ${SEED_ARG[@]} "$SRC" \ 271 | | "$ZIP" \ 272 | | "${PV[@]}" \ 273 | | "${DST_CMD[@]}" "${PIZ[@]} | sudo btrfs receive \"$DST\" 2>&1 |(grep -v -e'^At subvol ' -e'^At snapshot '||true)" \ 274 | || { 275 | "${DST_CMD[@]}" sudo btrfs subvolume delete "$DST"/"$( basename "$SRC" )" 2>/dev/null 276 | return 1; 277 | } 278 | 279 | # update DST list 280 | DSTS+=("$DST/$( basename "$SRC" )") 281 | DST_UUIDS+=("$SRC_UUID") 282 | SEED_NEXT="$SRC" 283 | } 284 | 285 | #---------------------------------------------------------------------------------------------------------- 286 | 287 | # sync all snapshots found in src 288 | echov "* Check destination" 289 | get_dst_snapshots "$DST" # sets DSTS DST_UUIDS 290 | for src in "${SRCS[@]}"; do 291 | sync_snapshot "$src" && RET=0 || RET=1 292 | for i in $(seq 1 2); do 293 | [[ "$RET" != "1" ]] && break 294 | echo "* Retrying '$src'..." 295 | sync_snapshot "$src" && RET=0 || RET=1 296 | done 297 | [[ "$RET" == "1" ]] && { echo "Abort"; exit 1; } 298 | done 299 | 300 | #---------------------------------------------------------------------------------------------------------- 301 | 302 | # retention policy 303 | [[ "$KEEP" != 0 ]] && \ 304 | [[ ${#DSTS[@]} -gt $KEEP ]] && \ 305 | echov "* Pruning old snapshots..." && \ 306 | for (( i=0; i < $(( ${#DSTS[@]} - KEEP )); i++ )); do 307 | PRUNE_LIST+=( "${DSTS[$i]}" ) 308 | done && \ 309 | ${DST_CMD[@]} sudo btrfs subvolume delete "${PRUNE_LIST[@]}" $SILENT 310 | 311 | # delete flag 312 | [[ "$DELETE" == 1 ]] && \ 313 | for dst in "${DSTS[@]}"; do 314 | FOUND=0 315 | for src in "${SRCS[@]}"; do 316 | [[ "$( basename $src )" == "$( basename $dst )" ]] && { FOUND=1; break; } 317 | done 318 | [[ "$FOUND" == 0 ]] && DEL_LIST+=( "$dst" ) 319 | done 320 | [[ "$DEL_LIST" != "" ]] && \ 321 | echov "* Deleting non existent snapshots..." && \ 322 | ${DST_CMD[@]} sudo btrfs subvolume delete "${DEL_LIST[@]}" $SILENT 323 | 324 | exit 0 325 | 326 | # License 327 | # 328 | # This script is free software; you can redistribute it and/or modify it 329 | # under the terms of the GNU General Public License as published by 330 | # the Free Software Foundation; either version 2 of the License, or 331 | # (at your option) any later version. 332 | # 333 | # This script is distributed in the hope that it will be useful, 334 | # but WITHOUT ANY WARRANTY; without even the implied warranty of 335 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 336 | # GNU General Public License for more details. 337 | # 338 | # You should have received a copy of the GNU General Public License 339 | # along with this script; if not, write to the 340 | # Free Software Foundation, Inc., 59 Temple Place, Suite 330, 341 | -------------------------------------------------------------------------------- /resources/btrfs-sync.gif: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/nachoparker/btrfs-sync/fe9173bd5fa6c069a81c6a192a8d7be7bf28f381/resources/btrfs-sync.gif --------------------------------------------------------------------------------