bin/backup-script

   1 #!/bin/bash
   2 #
   3 # backup-script system for cloning systems using rsync
   4 # Copyright (c)2008-2015 Alexander Barton <alex@barton.de>
   5 #
   6 # This program is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 2 of the License, or
   9 # (at your option) any later version.
  10 # Please read the file COPYING, README and AUTHORS for more information.
  11 #
  12
  13 NAME=$(basename "$0")
  14 PIDFILE="/var/run/$NAME.pid"
  15
  16 DRYRUN=0
  17 VERBOSE=0
  18
  19 export LC_ALL=C
  20
  21 declare -i count_all=0
  22 declare -i count_started=0
  23 declare -i count_ok=0
  24 declare -i count_ok_vanished=0
  25
  26 destinations=""
  27
  28 # Default settings, can be overwritten in backup-script.conf:
  29 conf_d="/etc/backup-script.d"
  30 pre_exec=""
  31 post_exec=""
  32 default_source_root="/"
  33 default_target=""
  34 default_user="root"
  35 default_ssh_args_add=""
  36 default_rsync_args_add=""
  37 default_exclude_args_add=""
  38 default_compress=1
  39 default_ping=1
  40 default_local=0
  41 default_generations=0
  42 default_job_pre_exec=""
  43 default_job_post_exec=""
  44
  45 Usage() {
  46         echo "Usage: $NAME [<options>] [<system> [<system> [...]]]"
  47         echo
  48         echo "  -p, --progress    Show progress, see rsync(1)."
  49         echo "  -n, --dry-run     Test run only, don't copy any data."
  50         echo
  51         echo "When no <system> is given, all defined systems are used."
  52         echo
  53         exit 1
  54 }
  55
  56 CleanUp() {
  57         if [ -n "$post_exec" ]; then
  58                 echo "Executing \"$post_exec\" ..."
  59                 sh -c $post_exec
  60                 if [ $? -ne 0 ]; then
  61                         echo "Warning: post-exec command failed!"
  62                 fi
  63                 echo
  64         fi
  65         rm -f "$PIDFILE"
  66 }
  67
  68 GotSignal() {
  69         echo
  70         echo "--> Got break signal, cleaning up & aborting ..."
  71         echo
  72         CleanUp
  73         echo -n "Aborted: "; date
  74         echo
  75         exit 9
  76 }
  77
  78 ExecJob() {
  79         local what="$1"
  80         local cmd="$2"
  81
  82         echo "Running job ${what}-exec command ..."
  83         [ "$local" -eq 0 ] \
  84                 && cmd="$ssh_cmd ${user}@${system} $cmd"
  85         echo -n "Start date (${what}-exec): "; date
  86         echo "$cmd"
  87         if [ "$DRYRUN" -eq 0 ]; then
  88                 $SHELL -c "$cmd"; local ret=$?
  89         else
  90                 echo " *** Trial run, not executing ${what}-exec command!"
  91                 ret=0
  92         fi
  93         [ $ret -eq 0 ] \
  94                 && echo "The ${what}-exec command completed with status 0, OK." \
  95                 || echo "The ${what}-exec command completed with ERRORS, code $ret!"
  96         return $ret
  97 }
  98
  99 GetFS() {
 100         local dir="$1"
 101
 102         while [ -n "$dir" ]; do
 103                 findmnt -fn -o FSTYPE --raw "$dir" 2>/dev/null; local r=$?
 104                 if [ $r -eq 0 ]; then
 105                         return 0
 106                 elif [ $r -eq 127 ]; then
 107                         echo "UNKNOWN"
 108                         return 1
 109                 fi
 110                 dir=$(dirname "$dir") || return 1
 111         done
 112 }
 113
 114 CreateSubvolume() {
 115         local volume="$1"
 116         local fs
 117         local dir
 118
 119         dir=$(dirname "$volume")
 120         fs=$(GetFS "$dir")
 121         case "$fs" in
 122           "btrfs")
 123                 btrfs subvolume create "$volume"  >/dev/null || return 1
 124                 ;;
 125           *)
 126                 echo "CreateSubvolume: Incompatible FS type \"$fs\" on \"$dir\"!"
 127                 return 9
 128         esac
 129         return 0
 130 }
 131
 132 CloneSubvolume() {
 133         local source="$1"
 134         local volume="$2"
 135         local snapshot="$3"
 136         local dir
 137         local fs
 138
 139         dir=$(dirname "source")
 140         fs=$(GetFS "$source")
 141         case "$fs" in
 142           "btrfs")
 143                 btrfs subvolume snapshot "$source" "$snapshot"  >/dev/null || return 1
 144                 ;;
 145           *)
 146                 echo "CloneSubvolume: Incompatible FS type \"$fs\" on \"$source\"!"
 147                 return 9
 148         esac
 149         return 0
 150 }
 151
 152 RenameSubvolume() {
 153         local source="$1"
 154         local target="$2"
 155         local fs
 156
 157         fs=$(GetFS "$source")
 158         case "$fs" in
 159           "btrfs")
 160                 mv "$source" "$target" || return 1
 161                 ;;
 162           *)
 163                 echo "RenameSubvolume: Incompatible FS type \"$fs\" on \"$source\"!"
 164                 return 9
 165         esac
 166         return 0
 167 }
 168
 169 DeleteSubvolume() {
 170         local volume="$1"
 171         local fs
 172
 173         fs=$(GetFS "$source")
 174         case "$fs" in
 175           "btrfs")
 176                 btrfs subvolume delete "$volume" >/dev/null || return 1
 177                 ;;
 178           *)
 179                 echo "DeleteSubvolume: Incompatible FS type \"$fs\" on \"$volume\"!"
 180                 return 9
 181         esac
 182         return 0
 183 }
 184
 185 Initialize_Last_SysTarget_Snapshot() {
 186         sys_target="$1"
 187         unset last
 188         unset snapshot
 189
 190         fs=$(GetFS "$sys_target")
 191         case "$fs" in
 192           "btrfs")
 193                 # Search directory of last generation, if any
 194                 last=$(ls -1d "$sys_target"/[0-9]* 2>/dev/null | sort -r | head -n1)
 195                 if [ -n "$last" ]; then
 196                         if [ ! -d "$last" ]; then
 197                                 echo "Last snapshot \"$last\" seems not to be a directory!? \"$system\" skipped!"
 198                                 echo
 199                                 return 1
 200                         fi
 201                 fi
 202                 sys_target="$sys_target/$(date +%Y%m%d-%H%M%S)"
 203                 snapshot="$sys_target"
 204                 ;;
 205           *)
 206                 echo "Initialize_Last_SysTarget_Snapshot: Incompatible FS type \"$fs\" on \"$sys_target\"!"
 207                 return 1
 208         esac
 209         return 0
 210 }
 211
 212 while [ $# -gt 0 ]; do
 213         case "$1" in
 214           "-n"|"--dry-run")
 215                 DRYRUN=1; shift
 216                 ;;
 217           "-p"|"--progress")
 218                 VERBOSE=1; shift
 219                 ;;
 220           "-"*)
 221                 Usage
 222                 ;;
 223           *)
 224                 break
 225         esac
 226 done
 227
 228 trap GotSignal SIGINT
 229
 230 echo -n "Started: "; date
 231
 232 for conf in "/etc/backup-script.conf" "${conf_d}/backup-script.conf"; do
 233         if [ -r "$conf" ]; then
 234                 echo "Reading configuration: \"$conf\" ..."
 235                 source "$conf"
 236         fi
 237 done
 238 echo
 239
 240 if [ $# -ge 1 ]; then
 241         for s in "$@"; do
 242                 if [ ! -r "${conf_d}/$s" ]; then
 243                         echo "$NAME: Can' read \"${conf_d}/$s\"!"
 244                         exit 1
 245                 fi
 246                 sys="$sys ${conf_d}/$s"
 247         done
 248 else
 249         sys="${conf_d}/"*
 250 fi
 251
 252 # check and create PID file
 253 if [ -e "$PIDFILE" ]; then
 254         echo "Lockfile \"$PIDFILE\" already exists."
 255         echo "Is an other instance still running?"
 256         echo
 257         echo -n "Aborted: "; date
 258         echo
 259         exit 3
 260 fi
 261 touch "$PIDFILE" 2>/dev/null
 262 if [ $? -ne 0 ]; then
 263         echo "Warning: can't create PID file \"$PIDFILE\"!"
 264         echo
 265 else
 266         echo "$$" >>"$PIDFILE"
 267 fi
 268
 269 if [ -n "$pre_exec" ]; then
 270         echo "Executing \"$pre_exec\" ..."
 271         sh -c $pre_exec
 272         if [ $? -ne 0 ]; then
 273                 echo "Error: pre-exec command failed!"; echo
 274                 CleanUp
 275                 echo "Aborting backup."; echo
 276                 exit 2
 277         fi
 278         sleep 2
 279         echo
 280 fi
 281
 282 for f in $sys; do
 283         [ -r "$f" -a -f "$f" ] || continue
 284
 285         fname=$(basename "$f")
 286         case "$fname" in
 287                 "backup-script.conf"|*.sh)
 288                         continue
 289                         ;;
 290         esac
 291
 292         # Set global defaults
 293         system="$fname"
 294         user="$default_user"
 295         source_root="$default_source_root"
 296         target="$default_target"
 297         ssh_args_add="$default_ssh_args_add"
 298         rsync_args_add="$default_rsync_args_add"
 299         exclude_args_add="$default_exclude_args_add"
 300         compress="$default_compress"
 301         ping="$default_ping"
 302         local="$default_local"
 303         generations="$default_generations"
 304         job_pre_exec="$default_job_pre_exec"
 305         job_post_exec="$default_job_post_exec"
 306
 307         # Compatibility with backup-pull(1) script: Save global values ...
 308         pre_exec_saved="$pre_exec"
 309         post_exec_saved="$post_exec"
 310
 311         # Compatibility with backup-pull(1) script: Set defaults
 312         unset host
 313         unset source
 314         unset pre_exec
 315         unset post_exec
 316
 317         # Read in system configuration file
 318         source "$f"
 319
 320         # Compatibility with backup-pull(1) script: Fix up configuration
 321         [ "$system" = "$fname" -a -n "$host" ] \
 322                 && system="$host"
 323         [ "$source_root" = "$default_source_root" -a -n "$source" ] \
 324                 && source_root="$source"
 325         [ -z "$job_pre_exec" -a -n "$pre_exec" ] \
 326                 && job_pre_exec="$pre_exec"
 327         [ -z "$job_post_exec" -a -n "$post_exec" ] \
 328                 && job_post_exec="$post_exec"
 329
 330         # Compatibility with backup-pull(1) script: Restore global values ...
 331         pre_exec="$pre_exec_saved"
 332         post_exec="$post_exec_saved"
 333
 334         # Validate configuration
 335         [ "$system" = "localhost" -o "$system" = "127.0.0.1" ] && local=1
 336
 337         [ "$system" = "$fname" ] \
 338                 && systxt="\"$system\"" \
 339                 || systxt="\"$fname\" [\"$system\"]"
 340         [ "$local" -eq 0 ] \
 341                 && echo "Working on $systxt ..." \
 342                 || echo "Working on $systxt (local system) ..."
 343
 344         count_all=$count_all+1
 345
 346         # Check target directory
 347         if [ -z "$target" ]; then
 348                 echo "No target directory specified for \"$system\"!? Skipped!"
 349                 echo; continue
 350         fi
 351         if [ ! -d "$target" ]; then
 352                 echo "Target \"$target\" is not a directory!? \"$system\" skipped!"
 353                 echo; continue
 354         fi
 355
 356         sys_target="$target/$fname"
 357         sys_root="$sys_target"
 358         if [ "$DRYRUN" -eq 0 ]; then
 359                 mkdir -p "$sys_target" >/dev/null 2>&1
 360                 if [ $? -ne 0 ]; then
 361                         echo "Can't create \"$sys_target\"!? \"$system\" skipped!"
 362                         echo; continue
 363                 fi
 364         fi
 365
 366         if [ "$local" -eq 0 -a "$ping" -ne 0 ]; then
 367                 # Check if system is alive
 368                 ping -c 1 "$system" >/dev/null 2>&1
 369                 if [ $? -ne 0 ]; then
 370                         echo "Host \"$system\" seems not to be alive!? Skipped."
 371                         echo; continue
 372                 fi
 373                 echo "OK, host \"$system\" seems to be alive."
 374         fi
 375
 376         if [ $generations -gt 0 ]; then
 377                 # Make sure no old backup is stored in system directory
 378                 if [ -e "$sys_target/.stamp" ]; then
 379                         # There seems to be a genearation-less backup in the
 380                         # target directory!
 381                         echo "Target directory \"$sys_target\" seems to be unclean!? \"$system\" skipped!"
 382                         echo; continue
 383                 fi
 384
 385                 Initialize_Last_SysTarget_Snapshot "$sys_target" || continue
 386
 387                 if [ -n "$last" -a ! -e "$last/.stamp" ]; then
 388                         # Old backup directory without "stamp file", continue
 389                         echo "Found incomplete snapshot in \"$last\", reusing and renaming it ..."
 390                         RenameSubvolume "$last" "$sys_target"
 391                         if [ $? -ne 0 ]; then
 392                                 echo "Failed to rename last snapshot \"$last\" to \"$sys_target\"!? \"$system\" skipped!"
 393                                 echo; continue
 394                         fi
 395                 elif [ -n "$last" ]; then
 396                         # Old backup directory found, create new snapshot
 397                         echo "Found last snapshot in \"$last\"."
 398                         if [ "$DRYRUN" -eq 0 ]; then
 399                                 CloneSubvolume "$last" "$sys_target" "$snapshot"; r=$?
 400                                 if [ $r -ne 0 ]; then
 401                                         echo "Can't create snapshot \"$snapshot\" of \"$last\", code $r!? \"$system\" skipped!"
 402                                         echo; continue
 403                                 fi
 404                                 echo "Created new snapshot in \"$snapshot\"."
 405                         else
 406                                 echo " *** Trial run, not creating new snapshot in \"$sys_target\"!"
 407                         fi
 408                 else
 409                         # No old backup found, create new subvolume
 410                         if [ "$DRYRUN" -eq 0 ]; then
 411                                 CreateSubvolume "$sys_target"; r=$?
 412                                 if [ $r -ne 0 ]; then
 413                                         echo "Can't create subvolume \"$sys_target\", code $r!? \"$system\" skipped!"
 414                                         echo; continue
 415                                 fi
 416                                 echo "Created new subvolume in \"$sys_target\"."
 417                         else
 418                                 echo " *** Trial run, not creating new subvolume \"$sys_target\"!"
 419                         fi
 420                 fi
 421         fi
 422
 423         ssh_cmd="ssh"
 424         [ -n "$ssh_args_add" ] && ssh_cmd="$ssh_cmd $ssh_args_add"
 425
 426         # execute job "pre-exec" command, if any
 427         if [ -n "$job_pre_exec" ]; then
 428                 ExecJob pre "$job_pre_exec" ; ret=$?
 429                 if [ $ret -ne 0 ]; then
 430                         [ $ret -ne 99 ] && count_started=$count_started+1
 431                         echo "Pre-exec command failed, \"$system\" skipped!"
 432                         echo; continue
 433                 fi
 434         fi
 435
 436         # prepare (remote) command ...
 437         cmd="rsync --archive"
 438         [ "$compress" -ne 0 ] && cmd="$cmd --compress"
 439         [ "$local" -eq 0 ] && cmd="$cmd --rsh=\"$ssh_cmd\""
 440         cmd="$cmd --delete --delete-excluded --sparse"
 441         [ "$VERBOSE" -gt 0 ] && cmd="$cmd --progress"
 442         if [ "$source_root" = "$default_source_root" ]; then
 443                 cmd="$cmd --exclude=/dev --exclude=/proc --exclude=/sys"
 444                 cmd="$cmd --exclude=/run --exclude=/tmp --exclude=/var/tmp"
 445                 cmd="$cmd --exclude=/media --exclude=/mnt --exclude=/net"
 446                 cmd="$cmd --exclude=/var/cache/apt --exclude=/var/log"
 447         fi
 448         [ -n "$exclude_args_add" ] && cmd="$cmd $exclude_args_add"
 449         [ -n "$rsync_args_add" ] && cmd="$cmd $rsync_args_add"
 450
 451         [ "$local" -eq 0 ] \
 452                 && cmd="$cmd ${user}@${system}:$source_root $sys_target/" \
 453                 || cmd="$cmd $source_root $sys_target/"
 454
 455         echo "Backing up to \"$sys_target\" ..."
 456         echo -n "Start date: "; date
 457         echo "$cmd"
 458         count_started=$count_started+1
 459         ok=0
 460
 461         if [ "$DRYRUN" -eq 0 ]; then
 462                 rm -f "$sys_target/.stamp"
 463                 $SHELL -c "$cmd"; ret=$?
 464                 echo "code=$ret" >"$sys_target/.stamp"
 465         else
 466                 echo " *** Trial run, not executing synchronization command!"
 467                 ret=0
 468         fi
 469
 470         if [ $ret -eq 20 ]; then
 471                 echo "Backup of \"$system\" interrupted. Aborting ..."
 472                 CleanUp
 473                 exit 1
 474         fi
 475
 476         echo -n "End date: "; date
 477         if [ $ret -eq 0 -o $ret -eq 24 ]; then
 478                 [ $ret -eq 24 ] && count_ok_vanished=$count_ok_vanished+1
 479
 480                 echo "System \"$system\" completed with status $ret, OK."
 481                 [ "$DRYRUN" -gt 0 ] || count_ok=$count_ok+1
 482                 ok=1
 483         else
 484                 echo "System \"$system\" completed with ERRORS, code $ret!"
 485         fi
 486
 487         # execute job "post-exec" command, if any
 488         if [ -n "$job_post_exec" ]; then
 489                 ExecJob post "$job_post_exec"
 490         fi
 491
 492         if [ $generations -gt 0 ]; then
 493                 # Update "latest" symlink
 494                 if [ "$DRYRUN" -eq 0 ]; then
 495                         rm -f "$sys_root/latest"
 496                         ln -s "$sys_target" "$sys_root/latest"
 497                 fi
 498                 # Clean up old generations
 499                 declare -i gen_count=$generations+2
 500                 to_delete=$(ls -1t "$sys_root" 2>/dev/null | tail -n+$gen_count | sort)
 501                 if [ -n "$to_delete" -a $ok -eq 1 ]; then
 502                         [ "$DRYRUN" -eq 0 ] \
 503                                 && echo "Deleting old backup generations (keep $generations) ..." \
 504                                 || echo " *** Trial run, not deleting old generations:"
 505                         for delete in $to_delete; do
 506                                 dir="$sys_root/$delete"
 507                                 if [ ! -e "$dir/.stamp" ]; then
 508                                         echo "Not deleting \"$dir\", not a backup directory!?"
 509                                         continue
 510                                 fi
 511                                 last=$(stat "$dir/.stamp" 2>/dev/null | grep "^Modify: " \
 512                                  | cut -d':' -f2- | cut -d. -f1)
 513                                 echo "Removing backup from" $last "..."
 514                                 if [ "$DRYRUN" -eq 0 ]; then
 515                                         DeleteSubvolume "$dir"
 516                                         [ $? -eq 0 ] || \
 517                                           echo "Failed to delete \"$dir\"!"
 518                                 fi
 519                         done
 520                         echo -n "Clean up finished: "; date
 521                 elif [ -n "$to_delete" ]; then
 522                         echo "There have been errors, not cleaning up old generations!"
 523                 else
 524                         echo "Nothing to clean up."
 525                 fi
 526         fi
 527
 528         destinations="$destinations $target"
 529         echo
 530 done
 531
 532 sync
 533
 534 paths=$( echo $destinations | sed -e 's/ /\n/g' | sort | uniq )
 535 if [ "$DRYRUN" -eq 0 -a -n "$paths" ]; then
 536         df -h $paths
 537         echo
 538 fi
 539
 540 CleanUp
 541
 542 echo -n "Done: "; date
 543 echo
 544 [ $count_all -eq 1 ] && s="" || s="s"
 545 echo " - $count_all job$s defined,"
 546 [ $count_started -eq 1 ] && s="" || s="s"
 547 echo " - $count_started job$s started,"
 548 echo " - $count_ok done without errors."
 549 echo
 550
 551 if [ $count_started -ne $count_ok ]; then
 552         echo "----->  THERE HAVE BEEN ERRORS!  <-----"
 553         echo
 554 fi
 555
 556 # -eof-