+infomsg "Backing up $computer"
+
+# Try to SSH to the computer without entering a password.
+if ! ssh -n -o NumberOfPasswordPrompts=0 $username@$computer /bin/true; then
+ diemsg "Could not use passwordless SSH."
+fi
+
+# Find the home directory of the backup user
+remotehome=`ssh -n $username@$computer "echo ~"`
+if [ -z "$remotehome" ]; then
+ diemsg "Could not expand ~ for user $username"
+fi
+
+# Check if pigz is available. Note that this may be overridden per-filesystem later.
+compressor=$( findconf compressor $computer )
+if [ -z "$compressor" ]; then
+ if ssh -n $username@$computer "pigz -V 2>/dev/null"; then
+ compressor=pigz
+ else
+ infomsg "pigz missing; falling back to gzip."
+ compressor=gzip
+ fi
+fi
+
+# Check if nice and ionice are available
+if ssh -n $username@$computer "nice -n 19 ionice -c3 /bin/true 2>/dev/null"; then
+ nice="nice -n 19 ionice -c3"
+else
+ infomsg "nice and/or ionice missing; will run at normal priority."
+ nice=""
+fi
+
+# Check dump bit in fstab
+filesystems=`ssh -n $username@$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 -n $username@$computer "rm -r $remotehome/.backup ; mkdir -m 700 $remotehome/.backup"; then
+ diemsg "Could not create backup staging area at $computer:$remotehome/.backup"
+fi
+
+# Try to copy $exclude to $computer
+if ! scp $exclude $username@$computer:$remotehome/.backup/exclude >&2; then
+ 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 $username@$computer:$remotehome/.backup/preexec >&2; then
+ diemsg "Could not copy preexec.$computer to $computer:$remotehome/.backup/preexec"
+ fi
+fi
+if [ -f $confdir/postexec.$computer ]; then
+ if ! scp $confdir/postexec.$computer $username@$computer:$remotehome/.backup/postexec >&2; then
+ diemsg "Could not copy postexec.$computer to $computer:$remotehome/.backup/postexec"
+ fi
+fi
+
+# Try to run preexec if it exists
+if ! ssh -n $username@$computer "[ ! -f $remotehome/.backup/preexec ] || /bin/bash -x $remotehome/.backup/preexec" >&2; then
+ diemsg "Could not run $computer:$remotehome/.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/daily 2>/dev/null
+
+ # Default backuplevel
+ backuplevel=daily
+
+ if [ ! -s $storagedir/$computer/$sfilesystem/.date ]; then
+ # Take the first full backup of this filesystem on this computer
+ backuplevel=full
+ fi
+
+ # Check if we want a full backup
+ fixedfullbackupday=$( findconf fixedfullbackupday $computer $filesystem )
+ if [ "$fixedfullbackupday" ]; then
+ fullbackup_min_for_this_machine=$( findconf daysbetweenfullforfixed $computer $filesystem )
+ if [ "$DAY_OF_MONTH" = "$fixedfullbackupday" ]; then
+ backuplevel=full
+ fi
+ else
+ fullbackup_min_for_this_machine=$( findconf daysbetweenfull $computer $filesystem )
+ 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
+ if [ "$( findconf nonpriv $computer )" ]; then
+ nonprivbackup
+ else
+ backup
+ fi
+
+ # Delete old full backups
+ mf=$( findconf maxnumfull $computer $filesystem )
+ mf=$(( mf + 1 ))
+ 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