# This handler slowly creates a backup of each user's maildir
# to a remote server. It is designed to be run with low overhead
# in terms of cpu and bandwidth so it runs pretty slow.
+# Hardlinking is used to save storage space.
#
-# if destdir is /backup/maildir/, then it will contain the files
+# each users maildir will contain these files:
# daily.1
# daily.2
# daily.3
# weekly.2
# monthly.1
# if keepdaily is 3, keepweekly is 2, and keepmonthly is 1.
+# the actual maildir is stored within each snapshot directory.
#
# The basic algorithm is to rsync each maildir individually,
# and to use hard links for retaining historical data.
#
-# We rsync each maildir individually because it becomes very
-# unweldy to start a single rsync of many hundreds of thousands
-# of files.
+# We handle each maildir individually because it becomes very
+# unweldy to hardlink and rsync many hundreds of thousands
+# of files at once. It is much faster to take on smaller
+# chunks at a time.
#
# For the backup rotation to work, destuser must be able to run
# arbitrary bash commands on the desthost.
#
+# Any maildir which is deleted from the source will be moved to
+# "deleted" directory in the destination. It is up to you to
+# periodically remove this directory or old maildirs in it.
+#
##############################################################
getconf rotate yes
getconf remove yes
+getconf backup yes
getconf loadlimit 5
getconf speedlimit 0
getconf destport 22
getconf destuser
-failedcount=0
+getconf multiconnection notset
+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"
+failedcount=0
# strip trailing /
destdir=${destdir%/}
srcdir=${srcdir%/}
# used for testing
-#getconf letter
#getconf testuser elijah
-getconf backup yes
-#letters=e
-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"
[ -d $srcdir ] || fatal "source directory $srcdir doesn't exist"
+[ "$multiconnection" == "notset" ] && fatal "The maildir handler uses a very different destination format. See the example .maildir for more information"
+
[ ! $test ] || testflags="--dry-run -v"
rsyncflags="$testflags -e 'ssh -p $destport' -r -v --ignore-existing --delete --size-only --bwlimit=$speedlimit"
excludes="--exclude '.Trash/\*' --exclude '.Mistakes/\*' --exclude '.Spam/\*'"
-# see if we can login
-debug "ssh -o PasswordAuthentication=no $desthost -l $destuser 'echo -n 1'"
-if [ ! $test ]; then
- result=`ssh -o PasswordAuthentication=no $desthost -l $destuser 'echo -n 1' 2>&1`
- if [ "$result" != "1" ]; then
- fatal "Can't connect to $desthost as $destuser."
- fi
-fi
-
##################################################################
### FUNCTIONS
function do_user() {
local user=$1
- local destdir=$2
+ local btype=$2
local letter=${user:0:1}
- local dir="$srcdir/$letter/$user"
- [ -d $dir ] || fatal "maildir $dir not found".
-
-# while true; do
-# load=`uptime | sed 's/^.*load average: \\([^,]*\\).*$/\\1/'`
-# over=`expr $load \> $loadlimit`
-# if [ $over == 1 ]; then
-# info "load $load, sleeping..."
-# sleep 600
-# else
-# break
-# fi
-# done
-
- cmd="$RSYNC $rsyncflags $excludes $dir $destuser@$desthost:$destdir/$letter"
- ret=`rsync -e "ssh -p $destport" -r \
---links --ignore-existing --delete --size-only --bwlimit=$speedlimit \
---exclude '.Trash/*' --exclude '.Mistakes/*' --exclude '.Spam/*' \
-$dir $destuser@$desthost:$destdir/$letter \
-2>&1`
+ local source="$srcdir/$letter/$user/"
+ local target="$destdir/$letter/$user/$btype.1"
+ [ -d $source ] || fatal "maildir $source not found".
+
+ debug "syncing"
+ ret=`$RSYNC -e "ssh -p $destport" -r \
+ --links --ignore-existing --delete --size-only --bwlimit=$speedlimit \
+ --exclude '.Trash/*' --exclude '.Mistakes/*' --exclude '.Spam/*' \
+ $source $destuser@$desthost:$target \
+ 2>&1`
ret=$?
# ignore 0 (success) and 24 (file vanished before it could be copied)
if [ $ret != 0 -a $ret != 24 ]; then
fatal "100 rsync errors -- something is not working right. bailing out."
fi
fi
+ ssh -o PasswordAuthentication=no $desthost -l $destuser "date +%c%n%s > $target/created"
}
# remove any maildirs from backup which might have been deleted
# and add new ones which have just been created.
+# (actually, it just moved them to the directory "deleted")
function do_remove() {
local tmp1=`maketemp maildir-tmp-file`
local tmp2=`maketemp maildir-tmp-file`
+ ssh -p $destport $destuser@$desthost mkdir -p "$destdir/deleted"
for i in a b c d e f g h i j k l m n o p q r s t u v w x y z; do
- ls -1 "$srcdir/$i" | sort > $tmp1
- ssh -p $destport $desthost ls -1 '$destdir/maildir/$i' | sort > $tmp2
+ ls -1 "$srcdir/$i/" | sort > $tmp1
+ ssh -p $destport $destuser@$desthost ls -1 "$destdir/$i/" | sort > $tmp2
for deluser in `join -v 2 $tmp1 $tmp2`; do
- cmd="ssh -p $destport $desthost rm -vr '$destdir/maildir/$i/$deluser/'"
- debug $cmd
+ [ "$deluser" != "" ] || continue
+ info "removing $destuser@$desthost:$destdir/$i/$deluser/"
+ ssh -p $destport $destuser@$desthost mv "$destdir/$i/$deluser/" "$destdir/deleted"
done
done
rm $tmp1
- rm $tmp2
+ rm $tmp2
}
function do_rotate() {
- backuproot=$destdir
-
+ [ "$rotate" == "yes" ] || return;
+ local user=$1
+ local letter=${user:0:1}
+ local backuproot="$destdir/$letter/$user"
(
- debug Connecting to $desthost
ssh -T -o PasswordAuthentication=no $desthost -l $destuser <<EOF
##### BEGIN REMOTE SCRIPT #####
seconds_daily=86400
keepmonthly=$keepmonthly
now=\`date +%s\`
+ if [ ! -d "$backuproot" ]; then
+ echo "Debug: skipping rotate of $user. $backuproot doesn't exist."
+ exit
+ fi
for rottype in daily weekly monthly; do
seconds=\$((seconds_\${rottype}))
dir="$backuproot/\$rottype"
if [ ! -d \$dir.1 ]; then
- echo "Info: \$dir.1 does not exist. This backup is missing, so we are skipping the rotation."
+ echo "Debug: \$dir.1 does not exist, skipping."
continue 1
elif [ ! -f \$dir.1/created ]; then
echo "Warning: \$dir.1/created does not exist. This backup may be only partially completed. Skipping rotation."
# Rotate the current list of backups, if we can.
oldest=\`find $backuproot -type d -maxdepth 1 -name \$rottype'.*' | sed 's/^.*\.//' | sort -n | tail -1\`
- echo "Debug: oldest \$oldest"
+ #echo "Debug: oldest \$oldest"
[ "\$oldest" == "" ] && oldest=0
for (( i=\$oldest; i > 0; i-- )); do
if [ -d \$dir.\$i ]; then
if [ ! \$created -gt \$cutoff_time ]; then
next=\$(( i + 1 ))
if [ ! -d \$dir.\$next ]; then
- echo "Debug: mv \$dir.\$i \$dir.\$next"
+ echo "Debug: \$rottype.\$i --> \$rottype.\$next"
mv \$dir.\$i \$dir.\$next
date +%c%n%s > \$dir.\$next/rotated
else
- echo "Info: skipping rotation of \$dir.\$i because \$dir.\$next already exists."
+ echo "Debug: skipping rotation of \$dir.\$i because \$dir.\$next already exists."
fi
else
- echo "Info: skipping rotation of \$dir.\$i because it was created" \$(( (now-created)/86400)) "days ago ("\$(( (now-cutoff_time)/86400))" needed)."
+ echo "Debug: skipping rotation of \$dir.\$i because it was created" \$(( (now-created)/86400)) "days ago ("\$(( (now-cutoff_time)/86400))" needed)."
fi
fi
done
max=\$((keepdaily+1))
if [ \( \$keepweekly -gt 0 -a -d $backuproot/daily.\$max \) -a ! -d $backuproot/weekly.1 ]; then
- echo mv $backuproot/daily.\$max $backuproot/weekly.1
+ echo "Debug: daily.\$max --> weekly.1"
mv $backuproot/daily.\$max $backuproot/weekly.1
date +%c%n%s > $backuproot/weekly.1/rotated
fi
max=\$((keepweekly+1))
if [ \( \$keepmonthly -gt 0 -a -d $backuproot/weekly.\$max \) -a ! -d $backuproot/monthly.1 ]; then
- echo mv $backuproot/weekly.\$max $backuproot/monthly.1
+ echo "Debug: weekly.\$max --> monthly.1"
mv $backuproot/weekly.\$max $backuproot/monthly.1
date +%c%n%s > $backuproot/monthly.1/rotated
fi
for (( i=\$oldest; i >= \$max; i-- )); do
if [ -d \$dir.\$i ]; then
if [ -d $backuproot/rotate.tmp ]; then
- echo "Info: removing $backuproot/rotate.tmp"
+ echo "Debug: removing rotate.tmp"
rm -rf $backuproot/rotate.tmp
fi
- echo "Info: moving \$dir.\$i to $backuproot/rotate.tmp"
+ echo "Debug: moving \$rottype.\$i to rotate.tmp"
mv \$dir.\$i $backuproot/rotate.tmp
fi
done
function setup_remote_dirs() {
- local backuptype=$1
- local dir="$destdir/$backuptype"
-
+ local user=$1
+ local backuptype=$2
+ local letter=${user:0:1}
+ local dir="$destdir/$letter/$user/$backuptype"
+ local tmpdir="$destdir/$letter/$user/rotate.tmp"
(
ssh -T -o PasswordAuthentication=no $desthost -l $destuser <<EOF
if [ ! -d $destdir ]; then
echo "Warning: we seem to be resuming a partially written $dir.1"
fi
else
- if [ -d $destdir/rotate.tmp ]; then
- mv $destdir/rotate.tmp $dir.1
+ if [ -d $tmpdir ]; then
+ mv $tmpdir $dir.1
if [ \$? == 1 ]; then
echo "Fatal: could mv $destdir/rotate.tmp $dir.1 on host $desthost"
exit 1
fi
else
- mkdir $dir.1
+ mkdir --parents $dir.1
if [ \$? == 1 ]; then
echo "Fatal: could not create directory $dir.1 on host $desthost"
exit 1
fi
- 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
- mkdir $dir.1/\$i
- done
fi
- if [ -d $destdir/$backuptype.2 ]; then
- echo "Info: updating hard links to $dir.1. This may take a while."
- cp -alf $destdir/$backuptype.2/. $dir.1
+ if [ -d $dir.2 ]; then
+ echo "Debug: update links $backuptype.2 --> $backuptype.1"
+ cp -alf $dir.2/. $dir.1
#if [ \$? == 1 ]; then
# echo "Fatal: could not create hard links to $dir.1 on host $desthost"
# exit 1
if [ $? == 1 ]; then exit; fi
}
+function start_mux() {
+ if [ "$multiconnection" == "yes" ]; then
+ debug "Starting dummy ssh connection"
+ ssh -p $destport $destuser@$desthost sleep 1d &
+ sleep 1
+ fi
+}
+
+function end_mux() {
+ if [ "$multiconnection" == "yes" ]; then
+ debug "Stopping dummy ssh connection"
+ ssh -p $destport $destuser@$desthost pkill sleep
+ fi
+}
+
###
##################################################################
-### ROTATE BACKUPS ###
+# see if we can login
+debug "ssh -o PasswordAuthentication=no $desthost -l $destuser 'echo -n 1'"
+if [ ! $test ]; then
+ result=`ssh -o PasswordAuthentication=no $desthost -l $destuser 'echo -n 1' 2>&1`
+ if [ "$result" != "1" ]; then
+ fatal "Can't connect to $desthost as $destuser."
+ fi
+fi
+
+end_mux
+start_mux
-if [ "$rotate" == "yes" ]; then
- do_rotate
+## SANITY CHECKS ##
+status=`ssh -p $destport $destuser@$desthost "[ -d \"$destdir\" ] && echo 'ok'"`
+if [ "$status" != "ok" ]; then
+ end_mux
+ fatal "Destination directory $destdir doesn't exist!"
+ exit
fi
### REMOVE OLD MAILDIRS ###
if [ "$remove" == "yes" ]; then
- debug remove
+ do_remove
fi
### MAKE BACKUPS ###
elif [ $keepweekly -gt 0 ]; then btype=weekly
elif [ $keepmonthly -gt 0 ]; then btype=monthly
else fatal "keeping no backups"; fi
-
- setup_remote_dirs $btype
- for i in $letters; do
- [ -d "$srcdir/$i" ] || fatal "directory $srcdir/$i not found."
- cd "$srcdir/$i"
- debug $i
- for user in `ls -1`; do
- if [ "$testuser" != "" -a "$testuser" != "$user" ]; then continue; fi
- do_user $user $destdir/$btype.1
+ if [ "$testuser" != "" ]; then
+ cd "$srcdir/${user:0:1}"
+ do_rotate $testuser
+ setup_remote_dirs $testuser $btype
+ do_user $testuser $btype
+ else
+ for i in $letters; do
+ [ -d "$srcdir/$i" ] || fatal "directory $srcdir/$i not found."
+ cd "$srcdir/$i"
+ debug $i
+ for user in `ls -1`; do
+ [ "$user" != "" ] || continue
+ info $user
+ do_rotate $user
+ setup_remote_dirs $user $btype
+ do_user $user $btype
+ done
done
- done
-
- ssh -o PasswordAuthentication=no $desthost -l $destuser "date +%c%n%s > $destdir/$btype.1/created"
+ fi
fi
+
+end_mux
+
projects / matthijs / upstream / backupninja.git / commitdiff