X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=backup.sh;h=6352fcebdff1b3a5eef94053292b9f58aea60ddc;hb=076bb4fa6d0c5a1e63b019848709969949dc191c;hp=0a4cb4ac2a61e7869b115fe1777974f3bd40f201;hpb=c027e80dd5f2ac433fefeb76dabc4a3f7aed988b;p=backup.sh

diff --git a/backup.sh b/backup.sh
index 0a4cb4a..6352fce 100755
--- a/backup.sh
+++ b/backup.sh
@@ -1,264 +1,290 @@
-#!/bin/sh
+#!/bin/bash
+# backup.sh
+# 
+# Backup up Unix-like computers
+# 
+# itk@samfundet.no
+#
+# This script was first checked into RCS in 2000, and has since backed up a few
+# servers almost every day, whenever not broken.
+# 
+# It's a bit peculiar, but quite effective. The following is worth keeping in
+# mind when hacking:
+#
+# Because of the way we run this script from cron, informational logging goes
+# to stderr and warnings and errors to stdout. This way, we get mail whenever
+# stuff fails, and other output is redirected to the log file.
+# 
+# The script is halfway Norwegian and halfway English. Newer modifications are
+# in English, we should probably stick to that.
+
+# The computer to backup.
+computer=$1
+
+# Configuration
+LOCKFILE=/home/backup/backuprun.lockfile.$computer
+confdir=/home/backup/conf/              # Configuration files
+storagedir=/backup                      # Where we keep backups
+maxnumfull=3                            # Number of full backups
+daysbetweenfull=30                      # Days between full backups
+daysbetweenfullforfixed=32              # Days between full backups for machines with fixed
+                                        # full-backup date (in case the fixed day gets missed)
+DAY_OF_MONTH=`date "+%d" | sed s/^0//`  # from 1 to 31
+DATE=`date "+%Y%m%d%H%M"`               #format: touch
+DATEs=`date "+%Y-%m-%d %H:%M"`          #format: tar
+
+# Exclude-pattern
+exclude=$confdir/exclude
+[ ! -f $exclude ] && printf "tmp\ncore\n" > $exclude
 
-# Locking
-LOCKFILE=/home/backup/backuprun.lockfile
+if [ -z "$computer" ]; then
+	echo "Usage: $0 COMPUTER"
+	exit 1
+fi
 
-# Die gracefully (ie. remove lockfile)
+# Die more or less gracefully (at least notify user)
 die() {
+	warnmsg "Aborting."
 	rm $LOCKFILE
-	exit 255
+	exit 1
+}
+diemsg() {
+	warnmsg "$@"
+	die
+}
+warnmsg() {
+	echo `date`": $computer: $@"
+	echo `date`": $computer: $@" >&2
+}
+infomsg() {
+	echo `date`": $computer: $@" >&2
 }
 
+# Trap C-c and kill
 trap die SIGINT SIGTERM
 
+# Don't start if we're already running
 if [ -e $LOCKFILE ]; then
-	echo `date`": $LOCKFILE exists, exiting."
-	exit 1
+	diemsg "$LOCKFILE exists for pid `cat $LOCKFILE`."
 fi;
 touch $LOCKFILE
+echo $$ > $LOCKFILE
 
-#dirs
-confdir=/home/backup/conf/           #configuration files
-storagedir=/backup                   #mountpoint of huge disc
-###
-
-#exclude-pattern
-exclude=$confdir/exclude
-[ ! -f $exclude ] && printf "tmp\ncore\n" > $exclude
-###
-
-#syntax of remotestat:
-#hostname:/directory/
-remotestatf=$confdir/remotestat
-[ -f $remotestatf ] && remotestat=`cat $remotestatf`
-###
-
-PATH=/local/bin:$PATH:/store/bin
-export PATH
-
-#start the logfile
-echo `date`": Backup run starting"
-echo "Exclude pattern:"
-cat $exclude
-echo "End exclude pattern"
+infomsg "Backup run starting"
 
 umask 027
 
-# The computers we want to back up
-unixcomputers=`cat $confdir/computers.unix \
-  | grep -v "^#" \
-  | grep -v "^$" `
-
-
-if [ $1 ] ; then 
-  unixcomputers=$1
-fi;
-###
-
-#disse bør kunne varieres fra fs til fs?
-maksantallfulle=3          #hvor mange fulle vi tar vare på
-dagermellomfulle=30        #antall dager før det er på tide med ny full
-logw=40
-###
-
-#lager datovariabeler
-DATE=`date "+%Y%m%d%H%M"`            #format: touch
-DATEs=`date "+%Y-%m-%d %H:%M"`       #format: tar
-###
-
-#selve backupen
-# krever at noen variabler er satt
-# krever at vi er i rett katalog
 backup()
 {
-
- printf "%-${logw}s %s\n" "$computer:$filesystem" "$backuplevel backup"
-
- if [ "$backuplevel" = "daglig" ] || [ "$backuplevel" = "incremental" ]
- then
-  lastd=`cat ../.date`
-  lastcmd="--newer='$lastd'"
- else
-  lastcmd=""
- fi
-
- #if this client has a special tar
- #we need to find a better solution to this conf-issue
- if [ -f $confdir/tar.$computer ] ; then
-   tar=`cat $confdir/tar.$computer`
- else 
-   tar=tar
- fi
-
- #expand the exclude-path for use with tar
- exf=`ssh $computer "ls ~/.backup/exclude"`
-
- #We try to run tar on the remote computer
- #    c create archive
- #    C change to directory first
- #    - output to stdout (we pipe to gzip, then to dd)
- #    . where to start taring (see C)
- #    $lastcmd only files newer than this
- #    --exclude-from file to get exclusion pattern from
- #    pipe to gzip, which in turn pipes over the ssh-stream
- #    ..to dd, to output to a file. We surpress messages from dd.
- #    And at last, redirect stderr to stdout, to get output logged.
- TARFILE=$DATE.tmp
- TARCMD="ssh $computer \"$tar --one-file-system -cf - -C $filesystem . $lastcmd \
-	--exclude-from=$exf | gzip\" | (dd of=$TARFILE 2> /dev/null) 2>&1"
- echo "cmdline: $TARCMD"
- eval $TARCMD
-
- # Ideally, we should check wether the tar command returned 0 or not, but it
- # seems a pipe in bash returns the value of the last command in the pipe.
- # Instead, we check wether the resulting file has zero size, in which case we
- # consider it an error.
- if [ -s $TARFILE ]; then
-  echo `date`": command probably ran without errors."
-  #perhaps it did work
-  mv $TARFILE $DATE.tgz
-  #make a filelist.
-  #update the datefile if the filelist is ok.
-  tar tvfz $DATE.tgz > $DATE.idx 2>&1 &&
-    echo $DATEs > ../.date            &&
-    touch -t $DATE ../.date
-
-  #make a sortet filelist
-  grep -v ^d $DATE.idx | sort -n -r +2 > $DATE.sdx
-
-  #fix perm
-  chmod 600 *tgz                      #only for us
-  chmod 644 *sdx *idx 2>/dev/null     #everyone can read
-
- else
-  #it did not work
-  rm $TARFILE
-  echo `date`": $TARFILE empty. $backuplevel backup of $computer:$filesystem failed and deleted"
- fi
-
-}
-
-#Løper gjennom listen av unixmaskiner som vi skal ta backup av
-for computer in $unixcomputers
-do
-( 
- echo `date`": Backing up $computer"
-
- # Try to SSH to the computer without entering a password.
- if `ssh -n -o NumberOfPasswordPrompts=0 $computer /bin/true`; then
-  echo "Passwordless SSH to $computer works."
- else
-  echo "Could not use passwordless SSH to $computer."
-  break;
- fi
+	infomsg "$computer:$filesystem $backuplevel backup"
+
+	localsnar="${storagedir}/${computer}/${sfilesystem}/.incremental.snar"
+	remotesnar="/root/.backup/${sfilesystem}.snar"
+	if [ "$backuplevel" = "daglig" ]; then
+		# If incremental backup, we need to copy the incremental status to $computer.
+		# If it does not exist, whine a bit and then run date-based instead.
+		if [ -s "$localsnar" ]; then
+			if ! scp $localsnar root@$computer:$remotesnar; then
+				diemsg "Could not copy .incremental.snar to $computer"
+			fi
+			lastcmd="--listed-incremental=$remotesnar --no-check-device"
+		else
+			infomsg "Missing incremental.snar for $filesystem, doing date-based backup instead until next full backup"
+			remotesnar=""
+			lastd=`cat ../.date`
+			lastcmd="--newer='$lastd'"
+		fi
+	else
+		# Note: Since we rm-ed .backup previously, and we don't scp over
+		# anything in this branch, this file will not exist, and we
+		# will be doing a full backup (but we want the output of it).
+		lastcmd="--listed-incremental=$remotesnar"
+	fi
+
+	# We try to run tar on the remote computer
+	#    c create archive
+	#    C change to directory first
+	#    . where to start taring (see C)
+	#    $lastcmd only files newer than this
+	#    --one-file-system don't traverse file systems
+	#    --use-compress-program compress it using gzip or pigz
+	#    --exclude-from file to get exclusion pattern from
+	#    Pipe the stuff over ssh to ourselves, run pee to cat the contents to a
+	#    file and build a file list, respectivly.  
+	TARFILE=$DATE.tmp
+	TARCMD="ssh root@$computer \"nice -n 19 ionice -c3 tar --one-file-system --use-compress-program $compressor -cf - -C $filesystem . $lastcmd \
+		--exclude-from=/root/.backup/exclude\" | pee \"cat > $TARFILE\" \"tar tzvf -\""
+	infomsg "Running $TARCMD"
+	eval $TARCMD > $DATE.idx
+
+	if [ $? -eq 0 ] && [ -s $TARFILE ]; then
+		# File is >0 in size and neither cat or tar tzvf failed; we assume it worked.
  
- #tømmer variabelen for sikkerhets skyld
- filesystems=""
-
- #Sjekker nest siste felt i fstab. Om det er 0 tar vi ikke backup
- filesystems=`ssh -n $computer "cat /etc/fstab" \
-  | grep -v nfs \
-  | grep -v "^#" \
-  | grep -v "^$" \
-  | awk '{ if ( $(NF-1) != "0" ) print $2}' `
-
- echo "Filesystems to backup on $computer: $filesystems"
-
- #clean up our dir at this client
- if ! ssh $computer "rm -r ~/.backup ; mkdir -m 700 ~/.backup"; then
-  echo "Could not create backup staging area at $computer:~/.backup"
-  break;
- fi
-
- #try to copy $exclude to $computer
- if ! scp $exclude $computer:~/.backup/exclude > /dev/null; then
-  echo "Could not copy exclude.txt to $computer"
-  break;
- fi
-
- #try to copy preeexec and postexec if they exist
- [ -f $confdir/preexec.$computer ] && (
-    scp $confdir/preexec.$computer  $computer:~/.backup/preexec ||
-     ( echo "Could not copy preexec.$computer to $computer:~/.backup/preexec"; break )
-    )
- [ -f $confdir/postexec.$computer ] && (
-    scp $confdir/postexec.$computer $computer:~/.backup/postexec ||
-     ( echo "Could not copy postexec.$computer to $computer:~/.backup/postexec"; break )
-    )
-
- #try to run preexec if it exist
- ssh $computer "[ -f ~/.backup/preexec ] && /bin/bash -x ~/.backup/preexec"
-
- for filesystem in $filesystems
- do
-  #lager en variant uten tegnet "/" eller $ (gjelder NT)
-  sfilesystem=`echo $filesystem | tr '\/\$' '__'`
-
-  #lager det som trengs av kataloger
-  mkdir -m 755 -p $storagedir/$computer/$sfilesystem/{full,daglig} 2>/dev/null
-
-  echo $filesystem > ${storagedir}/${computer}/.${sfilesystem}.name 
-  chmod 644 ${storagedir}/${computer}/.${sfilesystem}.name
-
-  #set default backuplevel
-  backuplevel=daglig
-
-  if [ ! -f $storagedir/$computer/$sfilesystem/.date ]
-  then
-   #take the first full backup of this filesystem on this computer
-   backuplevel=full
-   echo $DATEs > $storagedir/$computer/$sfilesystem/.date
-  fi
-
-  #sjekker om det er på tide med en full
-  if [ -z "`find $storagedir/$computer/$sfilesystem/full/ -name \*tgz -mtime -$dagermellomfulle`" ]; then
-   backuplevel=full
-  fi
- 
-  #gå ned i rett katalog, eller dø 
-  # TODO bør sende mail om dette skjer!
-  cd $storagedir/$computer/$sfilesystem/$backuplevel || die
-
-  #perform the actual backup
-  backup
-
-  # Sjekk om det skal være et annet antall fulle backuper av en boks
-  if [ -f $confdir/maksfulle.$computer ] ; then
-    mf=$((`cat $confdir/maksfulle.$computer`+1))
-  else
-    mf=$(($maksantallfulle+1))
-  fi
-
-  #delete complete backups
-  for full in `ls -1t $storagedir/$computer/$sfilesystem/full/*tgz | tail +$mf`
-  do
-   prefix=`echo $full | sed "s/\.[^.]*$//"`
-   echo "$computer:$filesystem sletter full $prefix (for mange)"
-   rm $prefix*
-  done
-
-  #delete incremental backups older than the oldest complete backup
-  oldf=`ls -t1 $storagedir/$computer/$sfilesystem/full/*tgz | tail -1`
-  find \
-     $storagedir/$computer/$sfilesystem/daglig \
-     -type f \
-     \! -newer $oldf \
-     -exec rm {} \;
-#     #denne funker bare med gnu find
-#     #-printf "$computer:$filesystem sletter daglig %f (for gammel)\n"
- done
-
- #try to run postexec if it exist
- ssh $computer "[ -f ~/.backup/postexec ] && /bin/bash -x ~/.backup/postexec"
-
-)  
-done &
-
-wait
-
-# print diskusage to logfile
-echo "Current disk usage:"
-df -k $storagedir
-
-echo `date`": Backup run ended"
+		if [ "$remotesnar" ]; then
+			if ! scp root@$computer:$remotesnar $localsnar.tmp; then
+				diemsg "Could not copy .incremental.snar from $computer"
+			fi
+		fi
+
+		# Move tar file in place
+		mv $TARFILE $DATE.tgz
+		if [ "$remotesnar" ]; then
+			mv $localsnar.tmp $localsnar
+		fi
+
+		# Update timestamp
+		echo $DATEs > ../.date && touch -t $DATE ../.date
+
+		# Make a sorted file list as well
+		sort -k6 < $DATE.idx > $DATE.sdx
+
+		# Fix permissions
+		chmod 600 *tgz                      #only for us
+		chmod 644 *sdx *idx 2>/dev/null     #everyone can read
+
+		# Let the remote computer know that we ran a successful backup (for nagios)
+		ssh root@$computer touch $filesystem/.lastbackup
+	else
+		# Something wrong happened.
+		rm $TARFILE
+		diemsg "tar failed or $TARFILE empty. $backuplevel backup of $computer:$filesystem failed and deleted"
+	fi
+}
 
+# Check that the target filesystem is mounted (actually check that it's not
+# the root filesystem)
+if [ ! -d "$storagedir/$computer" ]; then
+	diemsg "Target filesystem ($storagedir/$computer) does not exist."
+fi
+rootfilesystem=`df -P /`
+targetfilesystem=`df -P "$storagedir/$computer"`
+if [ "$rootfilesystem" == "$targetfilesystem" ]; then
+	diemsg "Target filesystem ($storagedir/$computer) was mounted on /."
+fi
+
+infomsg "Backing up $computer"
+
+# Try to SSH to the computer without entering a password.
+if ! ssh -n -o NumberOfPasswordPrompts=0 root@$computer /bin/true; then
+	diemsg "Could not use passwordless SSH."
+fi
+
+# Check if pigz is available
+if ssh -n root@$computer "pigz -V 2>/dev/null"; then
+	compressor=pigz
+else
+	infomsg "pigz missing; falling back to gzip."
+	compressor=gzip
+fi
+
+# Check dump bit in fstab
+filesystems=`ssh -n root@$computer "cat /etc/fstab" \
+	| grep -v nfs \
+	| grep -v "^#" \
+	| grep -v "^$" \
+	| awk '{ if ( $(NF-1) != "0" ) print $2}' `
+
+# Clean up our dir at this client
+if ! ssh root@$computer "rm -r /root/.backup ; mkdir -m 700 /root/.backup"; then
+	diemsg "Could not create backup staging area at $computer:/root/.backup"
+fi
+
+# Try to copy $exclude to $computer
+if ! scp $exclude root@$computer:/root/.backup/exclude > /dev/null; then
+	diemsg "Could not copy exclude.txt to $computer"
+fi
+
+# Try to copy preeexec and postexec if they exist
+if [ -f $confdir/preexec.$computer ]; then
+	if ! scp $confdir/preexec.$computer  root@$computer:/root/.backup/preexec >&2; then
+		diemsg "Could not copy preexec.$computer to $computer:/root/.backup/preexec"
+	fi
+fi
+if [ -f $confdir/postexec.$computer ]; then
+	if ! scp $confdir/postexec.$computer root@$computer:/root/.backup/postexec >&2; then
+		diemsg "Could not copy postexec.$computer to $computer:/root/.backup/postexec"
+	fi
+fi
+
+# Try to run preexec if it exists
+if ! ssh root@$computer "[ ! -f /root/.backup/preexec ] || /bin/bash -x /root/.backup/preexec" >&2; then
+	diemsg "Could not run $computer:/root/.backup/preexec"
+fi
+
+for filesystem in $filesystems; do
+	# Remove / and $ (for Windows) for path names
+	sfilesystem=`echo $filesystem | tr '\/\$' '__'`
+
+	# Prepare storage area
+	mkdir -m 755 -p $storagedir/$computer/$sfilesystem/full 2>/dev/null
+	mkdir -m 755 -p $storagedir/$computer/$sfilesystem/daglig 2>/dev/null
+
+	# Default backuplevel
+	backuplevel=daglig
+
+	if [ ! -s $storagedir/$computer/$sfilesystem/.date ]; then
+		# Take the first full backup of this filesystem on this computer
+		backuplevel=full
+	fi
+
+	# Check if we want a full backup
+	if [ -f $confdir/fastfullbackupdag.$computer.$sfilesystem ]; then
+		fullbackup_min_for_this_machine=$daysbetweenfullforfixed
+		if [ "$DAY_OF_MONTH" = "`cat $confdir/fastfullbackupdag.$computer.$sfilesystem`" ]; then
+			backuplevel=full
+		fi
+	elif [ -f $confdir/fastfullbackupdag.$computer ]; then
+		fullbackup_min_for_this_machine=$daysbetweenfullforfixed
+		if [ "$DAY_OF_MONTH" = "`cat $confdir/fastfullbackupdag.$computer`" ]; then
+			backuplevel=full
+		fi
+	else
+		fullbackup_min_for_this_machine=$daysbetweenfull 
+	fi
+
+	if [ -z "`find $storagedir/$computer/$sfilesystem/full/ -name \*tgz -mtime -$fullbackup_min_for_this_machine`" ]; then
+		backuplevel=full
+	fi
+
+	# We want to be here
+	cd $storagedir/$computer/$sfilesystem/$backuplevel || diemsg "$storagedir/$computer/$sfilesystem/$backuplevel does not exist"
+
+	# Perform the actual backup
+	backup
+
+	# Check if this box has a custom number of full backups
+	if [ -f $confdir/maksfulle.$computer.$sfilesystem ]; then
+		mf=$((`cat $confdir/maksfulle.$computer`+1))
+	elif [ -f $confdir/maksfulle.$computer ] ; then
+		mf=$((`cat $confdir/maksfulle.$computer`+1))
+	else
+		mf=$(($maxnumfull+1))
+	fi
+
+	# Delete old full backups
+	for full in `ls -1t $storagedir/$computer/$sfilesystem/full/*tgz | tail -n +$mf`; do
+		prefix=`echo $full | sed "s/\.[^.]*$//"`
+		infomsg "$computer:$filesystem Deleting full backup $prefix"
+		rm $prefix*
+	done
+
+	# Delete incremental backups older than the oldest full backup
+	oldf=`ls -t1 $storagedir/$computer/$sfilesystem/full/*tgz | tail -1`
+	find \
+		$storagedir/$computer/$sfilesystem/daglig \
+		-type f \
+		\! -newer $oldf \
+		-printf "`date`: $computer: Deleting old incremental backup: %p\n" \
+		-exec rm {} \; >&2
+done
+
+# Try to run postexec if it exist
+if ! ssh root@$computer "[ ! -f /root/.backup/postexec ] || /bin/bash -x /root/.backup/postexec" >&2; then
+	diemsg "Could not run $computer:/root/.backup/postexec"
+fi
+
+# Use warn so that we will get an email even on success.
+warnmsg "$computer: Backup completed successfully."
+
+# Remove lockfile
+rm $LOCKFILE