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1130b656e5
This will make a number of things easier in the future, as well as (finally!) avoiding the Id-smashing problem which has plagued developers for so long. Boy, I'm glad we're not using sup anymore. This update would have been insane otherwise.
407 lines
12 KiB
Groff
407 lines
12 KiB
Groff
.\" Copyright (c) 1985, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)restore.8 8.2 (Berkeley) 12/11/93
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.\" $FreeBSD$
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.\" "
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.Dd December 11, 1993
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.Dt RESTORE 8
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.Os BSD 4
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.Sh NAME
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.Nm restore
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.Nd "restore files or file systems from backups made with dump"
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.Sh SYNOPSIS
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.Nm restore
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.Ar key
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.Op Ar name Ar ...
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.Sh DESCRIPTION
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The
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.Nm restore
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command performs the inverse function of
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.Xr dump 8 .
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A full backup of a file system may be restored and
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subsequent incremental backups layered on top of it.
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Single files and
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directory subtrees may be restored from full or partial
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backups.
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.Nm Restore
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works across a network;
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to do this see the
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.Fl f
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flag described below.
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The actions
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of
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.Nm restore
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are controlled by the given
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.Cm key ,
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which
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is a string of characters containing
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at most one function letter and possibly
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one or more function modifiers.
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Other arguments to the command are file or directory
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names specifying the files that are to be restored.
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Unless the
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.Cm h
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key is specified (see below),
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the appearance of a directory name refers to
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the files and (recursively) subdirectories of that directory.
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.Pp
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The function portion of
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the key is specified by one of the following letters:
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.Bl -tag -width Ds
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.It Cm r
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Restore (rebuild a file system).
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The target file system should be made pristine with
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.Xr newfs 8 ,
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mounted and the
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user
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.Xr cd Ns 'd
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into the pristine file system
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before starting the restoration of the initial level 0 backup. If the
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level 0 restores successfully, the
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.Cm r
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key may be used to restore
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any necessary incremental backups on top of the level 0.
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The
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.Cm r
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key precludes an interactive file extraction and can be
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detrimental to one's health if not used carefully (not to mention
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the disk). An example:
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.Bd -literal -offset indent
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newfs /dev/rrp0g eagle
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mount /dev/rp0g /mnt
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cd /mnt
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restore rf /dev/rst8
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.Ed
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.Pp
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Note that
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.Nm restore
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leaves a file
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.Pa restoresymtable
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in the root directory to pass information between incremental
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restore passes.
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This file should be removed when the last incremental has been
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restored.
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.Pp
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.Nm Restore ,
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in conjunction with
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.Xr newfs 8
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and
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.Xr dump 8 ,
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may be used to modify file system parameters
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such as size or block size.
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.It Cm R
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.Nm Restore
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requests a particular tape of a multi volume set on which to restart
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a full restore
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(see the
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.Cm r
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key above).
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This is useful if the restore has been interrupted.
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.It Cm x
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The named files are read from the given media.
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If a named file matches a directory whose contents
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are on the backup
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and the
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.Cm h
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key is not specified,
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the directory is recursively extracted.
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The owner, modification time,
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and mode are restored (if possible).
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If no file argument is given,
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then the root directory is extracted,
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which results in the entire content of the
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backup being extracted,
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unless the
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.Cm h
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key has been specified.
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.It Cm t
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The names of the specified files are listed if they occur
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on the backup.
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If no file argument is given,
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then the root directory is listed,
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which results in the entire content of the
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backup being listed,
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unless the
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.Cm h
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key has been specified.
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Note that the
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.Cm t
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key replaces the function of the old
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.Xr dumpdir 8
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program.
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.It Cm i
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This mode allows interactive restoration of files from a dump.
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After reading in the directory information from the dump,
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.Nm restore
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provides a shell like interface that allows the user to move
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around the directory tree selecting files to be extracted.
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The available commands are given below;
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for those commands that require an argument,
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the default is the current directory.
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.Bl -tag -width Fl
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.It Ic add Op Ar arg
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The current directory or specified argument is added to the list of
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files to be extracted.
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If a directory is specified, then it and all its descendents are
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added to the extraction list
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(unless the
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.Cm h
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key is specified on the command line).
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Files that are on the extraction list are prepended with a ``*''
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when they are listed by
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.Ic ls .
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.It Ic \&cd Ar arg
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Change the current working directory to the specified argument.
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.It Ic delete Op Ar arg
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The current directory or specified argument is deleted from the list of
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files to be extracted.
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If a directory is specified, then it and all its descendents are
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deleted from the extraction list
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(unless the
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.Cm h
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key is specified on the command line).
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The most expedient way to extract most of the files from a directory
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is to add the directory to the extraction list and then delete
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those files that are not needed.
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.It Ic extract
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All the files that are on the extraction list are extracted
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from the dump.
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.Nm Restore
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will ask which volume the user wishes to mount.
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The fastest way to extract a few files is to
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start with the last volume, and work towards the first volume.
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.It Ic help
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List a summary of the available commands.
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.It Ic \&ls Op Ar arg
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List the current or specified directory.
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Entries that are directories are appended with a ``/''.
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Entries that have been marked for extraction are prepended with a ``*''.
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If the verbose key is set the inode number of each entry is also listed.
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.It Ic pwd
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Print the full pathname of the current working directory.
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.It Ic quit
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Restore immediately exits,
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even if the extraction list is not empty.
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.It Ic setmodes
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All the directories that have been added to the extraction list
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have their owner, modes, and times set;
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nothing is extracted from the dump.
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This is useful for cleaning up after a restore has been prematurely aborted.
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.It Ic verbose
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The sense of the
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.Cm v
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key is toggled.
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When set, the verbose key causes the
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.Ic ls
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command to list the inode numbers of all entries.
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It also causes
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.Nm restore
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to print out information about each file as it is extracted.
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.El
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.El
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.Pp
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The following characters may be used in addition to the letter
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that selects the function desired.
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.Bl -tag -width Ds
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.It Cm b
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The next argument to
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.Nm restore
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is used as the block size of the media (in kilobytes).
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If the
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.Fl b
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option is not specified,
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.Nm restore
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tries to determine the media block size dynamically.
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.It Cm f
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The next argument to
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.Nm restore
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is used as the name of the archive instead
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of
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.Pa /dev/rst0 .
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If the name of the file is of the form
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.Dq host:file ,
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.Nm restore
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reads from the named file on the remote host using
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.Xr rmt 8 .
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If the name of the file is
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.Ql Fl ,
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.Nm restore
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reads from standard input.
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Thus,
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.Xr dump 8
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and
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.Nm restore
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can be used in a pipeline to dump and restore a file system
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with the command
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.Bd -literal -offset indent
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dump 0f - /usr | (cd /mnt; restore xf -)
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.Ed
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.Pp
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.It Cm h
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.Nm Restore
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extracts the actual directory,
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rather than the files that it references.
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This prevents hierarchical restoration of complete subtrees
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from the dump.
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.It Cm m
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.Nm Restore
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will extract by inode numbers rather than by file name.
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This is useful if only a few files are being extracted,
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and one wants to avoid regenerating the complete pathname
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to the file.
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.It Cm s
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The next argument to
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.Nm restore
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is a number which
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selects the file on a multi-file dump tape. File numbering
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starts at 1.
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.It Cm v
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Normally
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.Nm restore
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does its work silently.
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The
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.Cm v
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(verbose)
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key causes it to type the name of each file it treats
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preceded by its file type.
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.It Cm y
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.Nm Restore
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will not ask whether it should abort the restore if it gets an error.
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It will always try to skip over the bad block(s) and continue as
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best it can.
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.El
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.Sh DIAGNOSTICS
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Complaints about bad key characters.
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.Pp
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Complaints if it gets a read error.
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If
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.Cm y
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has been specified, or the user responds
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.Ql y ,
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.Nm restore
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will attempt to continue the restore.
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.Pp
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If a backup was made using more than one tape volume,
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.Nm restore
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will notify the user when it is time to mount the next volume.
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If the
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.Cm x
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or
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.Cm i
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key has been specified,
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.Nm restore
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will also ask which volume the user wishes to mount.
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The fastest way to extract a few files is to
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start with the last volume, and work towards the first volume.
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.Pp
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There are numerous consistency checks that can be listed by
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.Nm restore .
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Most checks are self-explanatory or can ``never happen''.
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Common errors are given below.
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.Pp
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.Bl -tag -width Ds -compact
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.It Converting to new file system format.
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A dump tape created from the old file system has been loaded.
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It is automatically converted to the new file system format.
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.Pp
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.It <filename>: not found on tape
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The specified file name was listed in the tape directory,
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but was not found on the tape.
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This is caused by tape read errors while looking for the file,
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and from using a dump tape created on an active file system.
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.Pp
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.It expected next file <inumber>, got <inumber>
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A file that was not listed in the directory showed up.
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This can occur when using a dump created on an active file system.
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.Pp
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.It Incremental dump too low
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When doing incremental restore,
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a dump that was written before the previous incremental dump,
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or that has too low an incremental level has been loaded.
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.Pp
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.It Incremental dump too high
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When doing incremental restore,
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a dump that does not begin its coverage where the previous incremental
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dump left off,
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or that has too high an incremental level has been loaded.
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.Pp
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.It Tape read error while restoring <filename>
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.It Tape read error while skipping over inode <inumber>
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.It Tape read error while trying to resynchronize
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A tape (or other media) read error has occurred.
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If a file name is specified,
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then its contents are probably partially wrong.
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If an inode is being skipped or the tape is trying to resynchronize,
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then no extracted files have been corrupted,
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though files may not be found on the tape.
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.Pp
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.It resync restore, skipped <num> blocks
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After a dump read error,
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.Nm restore
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may have to resynchronize itself.
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This message lists the number of blocks that were skipped over.
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.El
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.Sh FILES
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.Bl -tag -width "./restoresymtable" -compact
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.It Pa /dev/rst0
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the default tape drive
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.It Pa /tmp/rstdir*
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file containing directories on the tape.
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.It Pa /tmp/rstmode*
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owner, mode, and time stamps for directories.
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.It Pa \&./restoresymtable
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information passed between incremental restores.
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.El
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.Sh SEE ALSO
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.Xr dump 8 ,
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.Xr ft 8 ,
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.Xr mount 8 ,
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.Xr newfs 8 ,
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.Xr rmt 8
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.Sh BUGS
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.Nm Restore
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can get confused when doing incremental restores from
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dump that were made on active file systems.
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.Pp
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A level zero dump must be done after a full restore.
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Because restore runs in user code,
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it has no control over inode allocation;
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thus a full dump must be done to get a new set of directories
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reflecting the new inode numbering,
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even though the contents of the files is unchanged.
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.Sh HISTORY
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The
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.Nm restore
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command appeared in
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.Bx 4.2 .
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