X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=backup.sh;h=6f861df68a3df6d9ae527ceea61ed09bea976abe;hb=5352077065dc208094ecdad22d3390a3e3d05b60;hp=bafb1e32997151728cd0289d0c86b452fa37b7d2;hpb=dc2f6bebb7369194f903d5cf70ba212c470c79bd;p=backup.sh

diff --git a/backup.sh b/backup.sh
index bafb1e3..6f861df 100755
--- a/backup.sh
+++ b/backup.sh
@@ -11,22 +11,12 @@
 # It's a bit peculiar, but quite effective. The following is worth keeping in
 # mind when hacking:
 #
-# KISS. And by that I mean really simple. Only regular Unix commands, please
-# (but GNU extensions are used and moreutils has to be installed).
-#
 # 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.
-# 
-# Known issues:
-#
-# o $R has no proper meaning because of the forking subshell stuff. We need a
-#   more robust way of returning non-zero on errors, which we probably don't
-#   right now.
-#
 
 # The computer to backup.
 computer=$1
@@ -35,9 +25,9 @@ computer=$1
 LOCKFILE=/home/backup/backuprun.lockfile.$computer
 confdir=/home/backup/conf/              # Configuration files
 storagedir=/backup                      # Where we keep backups
-maksantallfulle=3                       # Number of full backups
-dagermellomfulle=30                     # Days between full backups
-dagermellomfulleforfast=32              # Days between full backups for machines with fixed
+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
@@ -54,7 +44,8 @@ fi
 
 # Die more or less gracefully (at least notify user)
 die() {
-	echo `date`": Something nasty happened. Ending, and not deleting lockfile $LOCKFILE."
+	echo `date`": Something nasty happened."
+	rm $LOCKFILE
 	exit 1
 }
 
@@ -75,214 +66,223 @@ echo `date`": Backup run starting" >&2
 umask 027
 
 
-#selve backupen
-# krever at noen variabler er satt
-# krever at vi er i rett katalog
 backup()
 {
+	echo -n `date` >&2
+	printf " $computer: $computer:$filesystem $backuplevel backup\n" >&2
+
+	SNARFILE="${storagedir}/${computer}/${sfilesystem}/.incremental.snar"
+	incrementalsnar="/root/.backup/${sfilesystem}.snar"
+	if [ "$backuplevel" = "daglig" ]
+	then
+		# If incremental backup, we need to copy the incremental status to $computer.
+		# If it does not exist, whine a bit and then run date-based instead.
+		if [ -s "$SNARFILE" ]; then
+			if ! scp $SNARFILE root@$computer:$incrementalsnar; then
+				echo `date`" $computer: Could not copy .incremental.snar to $computer"
+				die
+			fi
+			lastcmd="--listed-incremental=$incrementalsnar --no-check-device"
+		else
+			echo `date`" $computer: Missing incremental.snar for $filesystem, doing date-based backup instead until next full backup" >&2
+			incrementalsnar=""
+			lastd=`cat ../.date`
+			lastcmd="--newer='$lastd'"
+		fi
+	else
+		lastcmd="--listed-incremental=$incrementalsnar"
+	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 -\""
+	echo `date`" $computer: Running $TARCMD" >&2
+	eval $TARCMD > $DATE.idx
+
+	if [ $? -eq 0 ] && [ -s $TARFILE ]; then
+		# File is >0 in size and neither cat or tar tzvf failed; we assume it worked.
+
+		if ! scp root@$computer:$incrementalsnar $SNARFILE.tmp; then
+			echo `date`" $computer: Could not copy .incremental.snar from $computer"
+			die
+		fi
+
+		# Move tar file in place
+		mv $TARFILE $DATE.tgz
+		mv $SNARFILE.tmp $SNARFILE
+
+		# 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
+		echo `date`" $computer: $TARFILE empty. $backuplevel backup of $computer:$filesystem failed and deleted"
+		die
+	fi
+}
 
- echo -n `date` >&2
- printf " $computer: $computer:$filesystem $backuplevel backup\n" >&2
-
- if [ "$backuplevel" = "daglig" ] || [ "$backuplevel" = "incremental" ]
- then
-  lastd=`cat ../.date`
-  lastcmd="--newer='$lastd'"
- else
-  lastcmd=""
- fi
-
- # expand the exclude-path for use with tar
- exf=`ssh root@$computer "ls ~/.backup/exclude"`
-
- # We try to run tar on the remote computer
- #    z gzip it
- #    c create archive
- #    C change to directory first
- #    . where to start taring (see C)
- #    $lastcmd only files newer than this
- #    --one-file-system don't traverse file systems
- #    --exclude-from file to get exclusion pattern from
- #    Pipe the stuff over ssh to ourselves, run pee to cat the contents to a
- #    file and build a file list, respectivly.  
- TARFILE=$DATE.tmp
- TARCMD="ssh root@$computer \"nice -n 19 ionice -c3 tar --one-file-system -zcf - -C $filesystem . $lastcmd \
-	--exclude-from=$exf\" | pee \"cat > $TARFILE\" \"tar tzvf -\""
- echo `date`" $computer: Running $TARCMD" >&2
- eval $TARCMD > $DATE.idx
-
- if [ -s $TARFILE ]; then
-  # File is >0 in size, we assume it worked.
-
-  # Move tar file in place
-  mv $TARFILE $DATE.tgz
-
-  # Update timestamp
-  echo $DATEs > ../.date && touch -t $DATE ../.date
-
-  # Make a sorted filelist 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
-  echo `date`" $computer: $TARFILE empty. $backuplevel backup of $computer:$filesystem failed and deleted"
-
-  # We don't want to return 0
-  die
- fi
+# Check that the target filesystem is mounted (actually check that it's not
+# the root filesystem)
+if [ ! -d "$storagedir/$computer" ]; then
+	echo `date`" $computer: Target filesystem ($storagedir/$computer) does not exist. Aborting"
+	die
+fi
+rootfilesystem=`df -P /`
+targetfilesystem=`df -P "$storagedir/$computer"`
+if [ "$rootfilesystem" == "$targetfilesystem" ]; then
+	echo `date`" $computer: Target filesystem ($storagedir/$computer) was mounted on /. Aborting"
+	die
+fi
 
-}
+echo `date`" $computer: Backing up $computer" >&2
+
+# Try to SSH to the computer without entering a password.
+if ! `ssh -n -o NumberOfPasswordPrompts=0 root@$computer /bin/true`; then
+	echo `date`" $computer: Could not use passwordless SSH."
+	die
+fi
 
- # Check that the target filesystem is mounted (actually check that it's not
- # the root filesystem)
- if [ ! -d "$storagedir/$computer" ]; then
- 	echo `date`" $computer: Target filesystem ($storagedir/$computer) does not exist. Aborting"
+# Check if pigz is available
+if ssh -n root@$computer "pigz -V 2>/dev/null"; then
+	compressor=pigz
+else
+	echo `date`" $computer: pigz missing; falling back to gzip."
+	compressor=gzip
+fi
+
+# Check dump bit in fstab
+filesystems=`ssh -n root@$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
+	echo `date`" $computer: Could not create backup staging area at $computer:/root/.backup"
 	die
- fi
- rootfilesystem=`df -P /`
- targetfilesystem=`df -P "$storagedir/$computer"`
- if [ "$rootfilesystem" == "$targetfilesystem" ]; then
- 	echo `date`" $computer: Target filesystem ($storagedir/$computer) was mounted on /. Aborting"
+fi
+
+# Try to copy $exclude to $computer
+if ! scp $exclude root@$computer:/root/.backup/exclude > /dev/null; then
+	echo `date`" $computer: Could not copy exclude.txt to $computer"
 	die
- fi
-
- echo `date`" $computer: Backing up $computer" >&2
-
- # Try to SSH to the computer without entering a password.
- if ! `ssh -n -o NumberOfPasswordPrompts=0 root@$computer /bin/true`; then
-  echo `date`" $computer: Could not use passwordless SSH."
-
-  # We don't want to return 0
-  die
- fi
- 
- filesystems=""
-
- # Check dump bit in fstab
- filesystems=`ssh -n root@$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 ~/.backup ; mkdir -m 700 ~/.backup"; then
-  echo `date`" $computer: Could not create backup staging area at $computer:~/.backup - skipping backup of $computer"
-  die
- fi
-
- # Try to copy $exclude to $computer
- if ! scp $exclude root@$computer:~/.backup/exclude > /dev/null; then
-  echo `date`" $computer: Could not copy exclude.txt to $computer - skipping backup of $computer"
-  die
- fi
-
- # Try to copy preeexec and postexec if they exist
- if [ -f $confdir/preexec.$computer ]; then
-   if ! scp $confdir/preexec.$computer  root@$computer:~/.backup/preexec >&2; then
-     echo `date`" $computer: Could not copy preexec.$computer to $computer:~/.backup/preexec - skipping backup of $computer"
-     die
-   fi
- fi
- if [ -f $confdir/postexec.$computer ]; then
-   if ! scp $confdir/postexec.$computer root@$computer:~/.backup/postexec >&2; then
-     echo `date`" $computer: Could not copy postexec.$computer to $computer:~/.backup/postexec - skipping backup of $computer"
-     die
-   fi
- fi
-
- # Try to run preexec if it exist
- if ! ssh root@$computer "[ ! -f ~/.backup/preexec ] || /bin/bash -x ~/.backup/preexec" >&2; then
- 	echo `date`" $computer: Could not run $computer:~/.backup/preexec - skipping backup of $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
+		echo `date`" $computer: Could not copy preexec.$computer to $computer:/root/.backup/preexec"
+		die
+	fi
+fi
+if [ -f $confdir/postexec.$computer ]; then
+	if ! scp $confdir/postexec.$computer root@$computer:/root/.backup/postexec >&2; then
+		echo `date`" $computer: Could not copy postexec.$computer to $computer:/root/.backup/postexec"
+		die
+	fi
+fi
+
+# Try to run preexec if it exists
+if ! ssh root@$computer "[ ! -f /root/.backup/preexec ] || /bin/bash -x /root/.backup/preexec" >&2; then
+	echo `date`" $computer: Could not run $computer:/root/.backup/preexec"
 	die
- 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
-  echo $filesystem > ${storagedir}/${computer}/.${sfilesystem}.name 
-  chmod 644 ${storagedir}/${computer}/.${sfilesystem}.name
-
-  # 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
-
-  # Check if we want a full backup - Debug statement that causes noise in cron mail:
-  # printf " $computer $filesystem: $confdir/fastfullbackupdag.$computer.$sfilesystem\n"
-  if [ -f $confdir/fastfullbackupdag.$computer.$sfilesystem ]; then
-    fullbackup_min_for_this_machine=$dagermellomfulleforfast
-    if [ "$DAY_OF_MONTH" = "`cat $confdir/fastfullbackupdag.$computer.$sfilesystem`" ]; then
-      backuplevel=full
-    fi
-  elif [ -f $confdir/fastfullbackupdag.$computer ]; then
-    fullbackup_min_for_this_machine=$dagermellomfulleforfast
-    if [ "$DAY_OF_MONTH" = "`cat $confdir/fastfullbackupdag.$computer`" ]; then
-      backuplevel=full
-    fi
-  else
-    fullbackup_min_for_this_machine=$dagermellomfulle 
-  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 || die
-
-  # Perform the actual backup
-  backup
-
-  # Check if this box has a custom number of full backups
-  if [ -f $confdir/maksfulle.$computer ] ; then
-    mf=$((`cat $confdir/maksfulle.$computer`+1))
-  else
-    mf=$(($maksantallfulle+1))
-  fi
-
-  # Delete old full backups
-  for full in `ls -1t $storagedir/$computer/$sfilesystem/full/*tgz | tail -n +$mf`
-  do
-   prefix=`echo $full | sed "s/\.[^.]*$//"`
-   echo `date`": $computer:$filesystem Deleting full backup $prefix" >&2
-   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 ~/.backup/postexec ] || /bin/bash -x ~/.backup/postexec" >&2; then
- 	echo `date`" $computer: Could not run $computer:~/.backup/postexec"
+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 [ ! -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
+
+	# 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 || die
+
+	# Perform the actual backup
+	backup
+
+	# Check if this box has a custom number of full backups
+	if [ -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 $full | sed "s/\.[^.]*$//"`
+		echo `date`": $computer:$filesystem Deleting full backup $prefix" >&2
+		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
+	echo `date`" $computer: Could not run $computer:/root/.backup/postexec"
 	die
- fi
+fi
 
 # Remove lockfile
 rm $LOCKFILE