# 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.
# Die more or less gracefully (at least notify user)
die() {
- echo `date`": Something nasty happened."
+ 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
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
-echo `date`": Backup run starting" >&2
+infomsg "Backup run starting"
umask 027
-
backup()
{
- echo -n `date` >&2
- printf " $computer: $computer:$filesystem $backuplevel backup\n" >&2
+ infomsg "$computer:$filesystem $backuplevel backup"
- SNARFILE="${storagedir}/${computer}/${sfilesystem}/.incremental.snar"
- incrementalsnar="/root/.backup/${sfilesystem}.snar"
- if [ "$backuplevel" = "daglig" ]
- then
+ 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 $computer.
# If it does not exist, whine a bit and then run date-based instead.
- if [ -s "$SNARFILE" ]; then
- if ! scp $SNARFILE root@$computer:$incrementalsnar; then
- echo `date`" $computer: Could not copy .incremental.snar to $computer"
- die
+ if [ -s "$localsnar" ]; then
+ if ! scp $localsnar root@$computer:$remotesnar; then
+ diemsg "Could not copy .incremental.snar to $computer"
fi
- lastcmd="--listed-incremental=$incrementalsnar --no-check-device"
+ lastcmd="--listed-incremental=$remotesnar --no-check-device"
else
- echo `date`" $computer: Missing incremental.snar for $filesystem, doing date-based backup instead until next full backup" >&2
- incrementalsnar=""
+ infomsg "Missing incremental.snar for $filesystem, doing date-based backup instead until next full backup"
+ remotesnar=""
lastd=`cat ../.date`
lastcmd="--newer='$lastd'"
fi
else
- lastcmd="--listed-incremental=$incrementalsnar"
+ # Note: Since we rm-ed .backup previously, and we don't scp over
+ # anything in this branch, this file will not exist, and we
+ # will be doing a full backup (but we want the output of it).
+ lastcmd="--listed-incremental=$remotesnar"
fi
# We try to run tar on the remote computer
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
+ infomsg "Running $TARCMD"
eval $TARCMD > $DATE.idx
if [ $? -eq 0 ] && [ -s $TARFILE ]; then
# File is >0 in size and neither cat or tar tzvf failed; we assume it worked.
-
- if ! scp root@$computer:$incrementalsnar $SNARFILE.tmp; then
- echo `date`" $computer: Could not copy .incremental.snar from $computer"
- die
+
+ if [ "$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
- mv $SNARFILE.tmp $SNARFILE
+ if [ "$remotesnar" ]; then
+ mv $localsnar.tmp $localsnar
+ fi
# Update timestamp
echo $DATEs > ../.date && touch -t $DATE ../.date
else
# Something wrong happened.
rm $TARFILE
- echo `date`" $computer: $TARFILE empty. $backuplevel backup of $computer:$filesystem failed and deleted"
- die
+ 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
- echo `date`" $computer: Target filesystem ($storagedir/$computer) does not exist. Aborting"
- die
+ diemsg "Target filesystem ($storagedir/$computer) does not exist."
fi
rootfilesystem=`df -P /`
targetfilesystem=`df -P "$storagedir/$computer"`
if [ "$rootfilesystem" == "$targetfilesystem" ]; then
- echo `date`" $computer: Target filesystem ($storagedir/$computer) was mounted on /. Aborting"
- die
+ diemsg "Target filesystem ($storagedir/$computer) was mounted on /."
fi
-echo `date`" $computer: Backing up $computer" >&2
+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
- echo `date`" $computer: Could not use passwordless SSH."
- die
+if ! ssh -n -o NumberOfPasswordPrompts=0 root@$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
- echo `date`" $computer: pigz missing; falling back to gzip."
+ infomsg "pigz missing; falling back to gzip."
compressor=gzip
fi
# Clean up our dir at this client
if ! ssh root@$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
+ 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
- echo `date`" $computer: Could not copy exclude.txt to $computer"
- die
+ 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
- echo `date`" $computer: Could not copy preexec.$computer to $computer:/root/.backup/preexec"
- die
+ diemsg "Could not copy preexec.$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
- echo `date`" $computer: Could not copy postexec.$computer to $computer:/root/.backup/postexec"
- die
+ diemsg "Could not copy postexec.$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
- echo `date`" $computer: Could not run $computer:/root/.backup/preexec"
- die
+ diemsg "Could not run $computer:/root/.backup/preexec"
fi
-for filesystem in $filesystems
-do
+for filesystem in $filesystems; do
# Remove / and $ (for Windows) for path names
sfilesystem=`echo $filesystem | tr '\/\$' '__'`
# Default backuplevel
backuplevel=daglig
- if [ ! -f $storagedir/$computer/$sfilesystem/.date ]
- then
+ if [ ! -s $storagedir/$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
fi
# We want to be here
- cd $storagedir/$computer/$sfilesystem/$backuplevel || die
+ 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 ] ; then
+ 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
+ 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 $prefix" >&2
+ infomsg "$computer:$filesystem Deleting full backup $prefix"
rm $prefix*
done
# Try to run postexec if it exist
if ! ssh root@$computer "[ ! -f /root/.backup/postexec ] || /bin/bash -x /root/.backup/postexec" >&2; then
- echo `date`" $computer: Could not run $computer:/root/.backup/postexec"
- die
+ 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
projects / backup.sh / blobdiff