#!/bin/sh
-export PATH=$rundir:/bin:/usr/bin
-
-if [ $# != 1 ]; then
- echo >&2 "Usage: $0 <source-directory> <target-directory>"
- echo >&2 "Example: $0 / /"
+function err() {
+ echo >&2 "-E- $1"
exit 1
+}
+
+[ -n "$3" ] && mountdir=$3
+
+[ -z "$mountdir" ] && err '$mountdir must be set'
+[ -z "$rundir" ] && err '$rundir must be set'
+
+export PATH=${rundir%/}:/bin:/usr/bin:/sbin:/usr/sbin:/sw/bin
+
+if [ ! -z "$1" -o ! -d "$2" ]; then
+ err "
+
+Usage: $(basename $0) <source-dir> <relocate-dir> [<mnt-dir>]
+ source-dir - Directory on backup disks to restore (relative to
+ $mountdir)
+ relocate-dir - Base directory to restore files into (usually /)
+ mnt-dir - Directory where backup disk is mounted (optional)
+
+Examples:
+ # Restore everything from disks (explicitly specifying dvd mount point.)
+ % $(basename $0) / / /mnt/cdrom
+
+ # Restore everything from disks
+ % $(basename $0) / /
+
+ # Restore only files under /home on disks to /home on the system
+ % $(basename $0) /home /
+
+ # Restore files under /home on disks to /home/home on the system
+ # (this is usually not what you want.)
+ % $(basename $0) /home /home
+"
fi
-device=$(mount | grep "on $mountdir " | awk '{print$1}')
-
-cp $mountdir/backups.db $mountdir/backup-status.txt $rundir
-dbfile=$rundir/backups.db
-
-for date in $(cat $dbfile | list-dates.sh); do
- success=false
- while ! $success; do
- eject $device
- echo >&2 "Please insert backup disk: $date"
- read bogus
- eject -t $device
-
- # Mount the media
- mount -t ext2 $device $mountdir
- if [ "" != "$(grep -l $date $mountdir/backup-status.txt)" ]; then
- success=true
- else
- echo >&2 "This doesn't seem to be the right disk."
- fi
- done
-
- rsyncopts="-l -p -t -g -o -0 --files-from=- --stats --progress "
- cat $dbfile | files-from-date.sh | rsync $rsyncopts $mountdir $2
+device=$(mount | grep "on ${mountdir%/} " | awk '{print$1}')
+
+[ -z "$device" ] && err "Cannot determine cdrom device"
+
+cp ${mountdir%/}/backups.db ${mountdir%/}/backup-status.txt $rundir
+dbfile=${rundir%/}/backups.db
+
+dates=$(cat $dbfile | list-dates.sh)
+
+for date in $dates; do
+ filelist=$(tempfile)
+ # Check to see if files are actually needed from the current disk before requesting it.
+ cat $dbfile | files-from-date.sh $date | grep -z -Z -e "^${1%/}/" > $filelist
+ if [ -s $filelist ]; then
+ success=false
+ while ! $success; do
+ eject $device
+ [ $? != 0 ] && err "Cannot eject the disk. Drive is busy. Run lsof $mountdir to see why."
+ echo "Please insert backup disk: $date"
+ echo "Press Enter to continue"
+ read bogus
+ eject -t $device
+
+ # Mount the media
+ mount -t ext2 $device ${mountdir%/}
+
+ if grep -q $date ${mountdir%/}/backup-status.txt; then
+ success=true
+ else
+ echo "This doesn't seem to be the right disk."
+ fi
+ done
+
+ rsyncopts="-W -H -S -l -p -t -g -o -0 --files-from=- --stats --progress"
+ cat $filelist | rsync $rsyncopts ${mountdir%/}/ ${2%/}/
+ else
+ echo "No files are needed from disk: $date. Skipping it."
+ fi
+ rm -f $filelist
done