mirror of
https://0xacab.org/liberate/backupninja.git
synced 2024-11-13 22:32:29 +01:00
311 lines
8.8 KiB
Plaintext
311 lines
8.8 KiB
Plaintext
# -*- mode: sh; sh-basic-offset: 3; indent-tabs-mode: nil; -*-
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###############################################################
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#
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# This handler slowly creates a backup of each user's maildir
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# to a remote server. It is designed to be run with low overhead
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# in terms of cpu and bandwidth so it runs pretty slow.
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#
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# if destdir is /backup/maildir/, then it will contain the files
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# daily.1
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# daily.2
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# daily.3
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# weekly.1
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# weekly.2
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# monthly.1
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# if keepdaily is 3, keepweekly is 2, and keepmonthly is 1.
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#
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# The basic algorithm is to rsync each maildir individually,
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# and to use hard links for retaining historical data.
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#
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# We rsync each maildir individually because it becomes very
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# unweldy to start a single rsync of many hundreds of thousands
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# of files.
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#
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# For the backup rotation to work, destuser must be able to run
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# arbitrary bash commands on the desthost.
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#
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##############################################################
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getconf rotate yes
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getconf remove yes
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getconf loadlimit 5
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getconf speedlimit 0
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getconf keepdaily 5
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getconf keepweekly 3
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getconf keepmonthly 1
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getconf srcdir /var/maildir
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getconf destdir
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getconf desthost
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getconf destport 22
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getconf destuser
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failedcount=0
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# strip trailing /
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destdir=${destdir%/}
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srcdir=${srcdir%/}
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# used for testing
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#getconf letter
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#getconf testuser elijah
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getconf backup yes
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#letters=e
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letters="a b c d e f g h i j k l m n o p q r s t u v w x y z"
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[ -d $srcdir ] || fatal "source directory $srcdir doesn't exist"
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[ ! $test ] || testflags="--dry-run -v"
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rsyncflags="$testflags -e 'ssh -p $destport' -r -v --ignore-existing --delete --size-only --bwlimit=$speedlimit"
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excludes="--exclude '.Trash/\*' --exclude '.Mistakes/\*' --exclude '.Spam/\*'"
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# see if we can login
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debug "ssh -o PasswordAuthentication=no $desthost -l $destuser 'echo -n 1'"
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if [ ! $test ]; then
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result=`ssh -o PasswordAuthentication=no $desthost -l $destuser 'echo -n 1' 2>&1`
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if [ "$result" != "1" ]; then
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fatal "Can't connect to $desthost as $destuser."
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fi
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fi
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##################################################################
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### FUNCTIONS
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function do_user() {
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local user=$1
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local destdir=$2
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local letter=${user:0:1}
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local dir="$srcdir/$letter/$user"
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[ -d $dir ] || fatal "maildir $dir not found".
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# while true; do
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# load=`uptime | sed 's/^.*load average: \\([^,]*\\).*$/\\1/'`
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# over=`expr $load \> $loadlimit`
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# if [ $over == 1 ]; then
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# info "load $load, sleeping..."
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# sleep 600
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# else
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# break
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# fi
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# done
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cmd="$RSYNC $rsyncflags $excludes $dir $destuser@$desthost:$destdir/$letter"
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ret=`rsync -e "ssh -p $destport" -r \
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--links --ignore-existing --delete --size-only --bwlimit=$speedlimit \
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--exclude '.Trash/*' --exclude '.Mistakes/*' --exclude '.Spam/*' \
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$dir $destuser@$desthost:$destdir/$letter \
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2>&1`
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ret=$?
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# ignore 0 (success) and 24 (file vanished before it could be copied)
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if [ $ret != 0 -a $ret != 24 ]; then
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warning "rsync $user failed"
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warning " returned: $ret"
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let "failedcount = failedcount + 1"
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if [ $failedcount -gt 100 ]; then
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fatal "100 rsync errors -- something is not working right. bailing out."
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fi
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fi
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}
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# remove any maildirs from backup which might have been deleted
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# and add new ones which have just been created.
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function do_remove() {
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local tmp1=`maketemp maildir-tmp-file`
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local tmp2=`maketemp maildir-tmp-file`
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for i in a b c d e f g h i j k l m n o p q r s t u v w x y z; do
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ls -1 "$srcdir/$i" | sort > $tmp1
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ssh -p $destport $desthost ls -1 '$destdir/maildir/$i' | sort > $tmp2
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for deluser in `join -v 2 $tmp1 $tmp2`; do
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cmd="ssh -p $destport $desthost rm -vr '$destdir/maildir/$i/$deluser/'"
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debug $cmd
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done
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done
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rm $tmp1
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rm $tmp2
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}
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function do_rotate() {
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backuproot=$destdir
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(
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debug Connecting to $desthost
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ssh -T -o PasswordAuthentication=no $desthost -l $destuser <<EOF
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##### BEGIN REMOTE SCRIPT #####
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seconds_daily=86400
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seconds_weekly=604800
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seconds_monthly=2628000
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keepdaily=$keepdaily
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keepweekly=$keepweekly
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keepmonthly=$keepmonthly
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now=\`date +%s\`
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for rottype in daily weekly monthly; do
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seconds=\$((seconds_\${rottype}))
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dir="$backuproot/\$rottype"
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if [ ! -d \$dir.1 ]; then
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echo "Info: \$dir.1 does not exist. This backup is missing, so we are skipping the rotation."
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continue 1
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elif [ ! -f \$dir.1/created ]; then
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echo "Warning: \$dir.1/created does not exist. This backup may be only partially completed. Skipping rotation."
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continue 1
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fi
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# Rotate the current list of backups, if we can.
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oldest=\`find $backuproot -type d -maxdepth 1 -name \$rottype'.*' | sed 's/^.*\.//' | sort -n | tail -1\`
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echo "Debug: oldest \$oldest"
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[ "\$oldest" == "" ] && oldest=0
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for (( i=\$oldest; i > 0; i-- )); do
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if [ -d \$dir.\$i ]; then
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if [ -f \$dir.\$i/created ]; then
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created=\`tail -1 \$dir.\$i/created\`
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else
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created=0
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fi
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cutoff_time=\$(( now - (seconds*(i-1)) ))
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if [ ! \$created -gt \$cutoff_time ]; then
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next=\$(( i + 1 ))
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if [ ! -d \$dir.\$next ]; then
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echo "Debug: mv \$dir.\$i \$dir.\$next"
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mv \$dir.\$i \$dir.\$next
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date +%c%n%s > \$dir.\$next/rotated
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else
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echo "Info: skipping rotation of \$dir.\$i because \$dir.\$next already exists."
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fi
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else
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echo "Info: skipping rotation of \$dir.\$i because it was created" \$(( (now-created)/86400)) "days ago ("\$(( (now-cutoff_time)/86400))" needed)."
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fi
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fi
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done
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done
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max=\$((keepdaily+1))
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if [ \( \$keepweekly -gt 0 -a -d $backuproot/daily.\$max \) -a ! -d $backuproot/weekly.1 ]; then
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echo mv $backuproot/daily.\$max $backuproot/weekly.1
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mv $backuproot/daily.\$max $backuproot/weekly.1
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date +%c%n%s > $backuproot/weekly.1/rotated
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fi
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max=\$((keepweekly+1))
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if [ \( \$keepmonthly -gt 0 -a -d $backuproot/weekly.\$max \) -a ! -d $backuproot/monthly.1 ]; then
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echo mv $backuproot/weekly.\$max $backuproot/monthly.1
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mv $backuproot/weekly.\$max $backuproot/monthly.1
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date +%c%n%s > $backuproot/monthly.1/rotated
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fi
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for rottype in daily weekly monthly; do
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max=\$((keep\${rottype}+1))
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dir="$backuproot/\$rottype"
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oldest=\`find $backuproot -type d -maxdepth 1 -name \$rottype'.*' | sed 's/^.*\.//' | sort -n | tail -1\`
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[ "\$oldest" == "" ] && oldest=0
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# if we've rotated the last backup off the stack, remove it.
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for (( i=\$oldest; i >= \$max; i-- )); do
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if [ -d \$dir.\$i ]; then
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if [ -d $backuproot/rotate.tmp ]; then
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echo "Info: removing $backuproot/rotate.tmp"
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rm -rf $backuproot/rotate.tmp
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fi
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echo "Info: moving \$dir.\$i to $backuproot/rotate.tmp"
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mv \$dir.\$i $backuproot/rotate.tmp
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fi
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done
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done
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####### END REMOTE SCRIPT #######
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EOF
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) | (while read a; do passthru $a; done)
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}
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function setup_remote_dirs() {
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local backuptype=$1
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local dir="$destdir/$backuptype"
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(
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ssh -T -o PasswordAuthentication=no $desthost -l $destuser <<EOF
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if [ ! -d $destdir ]; then
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echo "Fatal: Destination directory $destdir does not exist on host $desthost."
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exit 1
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elif [ -d $dir.1 ]; then
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if [ -f $dir.1/created ]; then
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echo "Warning: $dir.1 already exists. Overwriting contents."
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else
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echo "Warning: we seem to be resuming a partially written $dir.1"
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fi
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else
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if [ -d $destdir/rotate.tmp ]; then
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mv $destdir/rotate.tmp $dir.1
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if [ \$? == 1 ]; then
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echo "Fatal: could mv $destdir/rotate.tmp $dir.1 on host $desthost"
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exit 1
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fi
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else
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mkdir $dir.1
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if [ \$? == 1 ]; then
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echo "Fatal: could not create directory $dir.1 on host $desthost"
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exit 1
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fi
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for i in a b c d e f g h i j k l m n o p q r s t u v w y x z; do
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mkdir $dir.1/\$i
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done
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fi
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if [ -d $destdir/$backuptype.2 ]; then
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echo "Info: updating hard links to $dir.1. This may take a while."
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cp -alf $destdir/$backuptype.2/. $dir.1
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#if [ \$? == 1 ]; then
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# echo "Fatal: could not create hard links to $dir.1 on host $desthost"
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# exit 1
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#fi
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fi
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fi
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[ -f $dir.1/created ] && rm $dir.1/created
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[ -f $dir.1/rotated ] && rm $dir.1/rotated
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exit 0
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EOF
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) | (while read a; do passthru $a; done)
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if [ $? == 1 ]; then exit; fi
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}
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###
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##################################################################
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### ROTATE BACKUPS ###
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if [ "$rotate" == "yes" ]; then
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do_rotate
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fi
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### REMOVE OLD MAILDIRS ###
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if [ "$remove" == "yes" ]; then
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debug remove
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fi
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### MAKE BACKUPS ###
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if [ "$backup" == "yes" ]; then
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if [ $keepdaily -gt 0 ]; then btype=daily
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elif [ $keepweekly -gt 0 ]; then btype=weekly
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elif [ $keepmonthly -gt 0 ]; then btype=monthly
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else fatal "keeping no backups"; fi
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setup_remote_dirs $btype
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for i in $letters; do
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[ -d "$srcdir/$i" ] || fatal "directory $srcdir/$i not found."
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cd "$srcdir/$i"
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debug $i
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for user in `ls -1`; do
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if [ "$testuser" != "" -a "$testuser" != "$user" ]; then continue; fi
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do_user $user $destdir/$btype.1
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done
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done
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ssh -o PasswordAuthentication=no $desthost -l $destuser "date +%c%n%s > $destdir/$btype.1/created"
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fi
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