X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=backup.sh;h=6352fcebdff1b3a5eef94053292b9f58aea60ddc;hb=2ff8529b9960dc83317f3e64f15ca9fc79878e39;hp=61ec0f5b365254fbe7973c62d187ad749fe3d5af;hpb=b6bffb3924a05e6f37cc8f21db2c793c23c8ca25;p=backup.sh

diff --git a/backup.sh b/backup.sh
index 61ec0f5..6352fce 100755
--- a/backup.sh
+++ b/backup.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # backup.sh
 # 
 # Backup up Unix-like computers
@@ -11,35 +11,23 @@
 # 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).
-#
 # 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 computers are backed up in parallell (but the filesystems on each
-# computer in serial). This is implemented highly simplistic, with forking
-# subshells. The script has no concept about threads, and stuff might go wrong,
-# which usually requires manual cleanups.
-#
 # 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
 
 # Configuration
-LOCKFILE=/home/backup/backuprun.lockfile
+LOCKFILE=/home/backup/backuprun.lockfile.$computer
 confdir=/home/backup/conf/              # Configuration files
 storagedir=/backup                      # Where we keep backups
-maksantallfulle=3                       # Number of full backups
-dagermellomfulle=30                     # Days between full backups
-dagermellomfulleforfast=32              # Days between full backups for machines with fixed
+maxnumfull=3                            # Number of full backups
+daysbetweenfull=30                      # Days between full backups
+daysbetweenfullforfixed=32              # Days between full backups for machines with fixed
                                         # full-backup date (in case the fixed day gets missed)
 DAY_OF_MONTH=`date "+%d" | sed s/^0//`  # from 1 to 31
 DATE=`date "+%Y%m%d%H%M"`               #format: touch
@@ -49,15 +37,27 @@ DATEs=`date "+%Y-%m-%d %H:%M"`          #format: tar
 exclude=$confdir/exclude
 [ ! -f $exclude ] && printf "tmp\ncore\n" > $exclude
 
-# Initially, we consider everything to be just fine.
-R=0
+if [ -z "$computer" ]; then
+	echo "Usage: $0 COMPUTER"
+	exit 1
+fi
 
 # Die more or less gracefully (at least notify user)
 die() {
-	echo `date`": Something nasty happened, and since I fork a lot:"
-        echo `date`": I CANNOT CLEAN UP THE MESS MYSELF."
-	echo `date`": You need to get rid of lost process named stuff like $0, tar and ssh."
-	exit 255
+	warnmsg "Aborting."
+	rm $LOCKFILE
+	exit 1
+}
+diemsg() {
+	warnmsg "$@"
+	die
+}
+warnmsg() {
+	echo `date`": $computer: $@"
+	echo `date`": $computer: $@" >&2
+}
+infomsg() {
+	echo `date`": $computer: $@" >&2
 }
 
 # Trap C-c and kill
@@ -65,270 +65,226 @@ trap die SIGINT SIGTERM
 
 # Don't start if we're already running
 if [ -e $LOCKFILE ]; then
-	echo `date`": $LOCKFILE exists for pid `cat $LOCKFILE`, exiting."
-	echo `date`": $LOCKFILE exists for pid `cat $LOCKFILE`, exiting." >&2
-	exit 1
+	diemsg "$LOCKFILE exists for pid `cat $LOCKFILE`."
 fi;
 touch $LOCKFILE
 echo $$ > $LOCKFILE
 
-#syntax of remotestat:
-#hostname:/directory/
-remotestatf=$confdir/remotestat
-[ -f $remotestatf ] && remotestat=`cat $remotestatf`
-###
+infomsg "Backup run starting"
 
-PATH=/local/bin:$PATH:/store/bin
-export PATH
+umask 027
 
-echo `date`": Backup run starting" >&2
+backup()
+{
+	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 $TARFILE ]; then
+		# File is >0 in size and neither cat or tar tzvf failed; we assume it worked.
+ 
+		if [ "$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
+}
 
-umask 027
+# 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
 
-# The computers we want to back up
-unixcomputers=`cat $confdir/computers.unix \
-  | grep -v "^#" \
-  | grep -v "^$" `
+infomsg "Backing up $computer"
 
-# Backup only one computer, from command line?
-if [ $1 ] ; then 
-  unixcomputers=$1
-fi;
+# Try to SSH to the computer without entering a password.
+if ! ssh -n -o NumberOfPasswordPrompts=0 root@$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
 
-#selve backupen
-# krever at noen variabler er satt
-# krever at vi er i rett katalog
-backup()
-{
+# 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}' `
 
- 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
-
- #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 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@$computer \"$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
-
- 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
-  R=1
- fi
+# 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
 
-for computer in $unixcomputers
-do
-( 
- # Check that the target filesystem is mounted (actually check that it's not
- # the root filesystem)
- rootfilesystem=`df -P /`
- targetfilesystem=`df -P "$storagedir/$computer"`
- if [ "$rootfilesystem" == "$targetfilesystem" ]; then
- 	echo `date`" $computer: Target filesystem ($storagedir/$computer) was mounted on /. Aborting"
-	continue
- 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`" $computer: Could not use passwordless SSH."
-
-  # We don't want to return 0
-  R=1
-  # Do next computer
-  continue;
- fi
- 
- filesystems=""
-
- # Check dump bit in fstab
- filesystems=`ssh -n root@$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"
-  R=1
-  continue;
- 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"
-  R=1
-  continue;
- 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"
-     R=1
-     continue
-   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 $computer"
-     R=1
-     continue
-   fi
- fi
-
- # Try to run preexec if it exist
- if ! ssh root@$computer "[ ! -f ~/.backup/preexec ] || /bin/bash -x ~/.backup/preexec" >&2; then
- 	echo `date`" $computer: Could not run $computer:~/.backup/preexec - skipping backup of $computer"
-	R=1
-	continue
- 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,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"
-	R=1
- 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
 
-wait
+# 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
-
-# Did anything go wrong?
-# (IMPORTANT NOTE: The R-business does not work as expected, since this script
-# forks itself).
-if [ $R != 0 ]; then
-	echo `date`": Backup run ended with errors, check logs."
-	exit 1
-else
-	echo `date`": Backup run ended" >&2
-fi