MirOS Manual: restore(8), rrestore(8)

RESTORE(8)               BSD System Manager's Manual                RESTORE(8)

NAME

     restore - restore files or file systems from backups made with dump

SYNOPSIS

     restore -i [-chmvy] [-b blocksize] [-f file] [-s fileno]
     restore -R [-cvy] [-b blocksize] [-f file] [-s fileno]
     restore -r [-cvy] [-b blocksize] [-f file] [-s fileno]
     restore -t [-chvy] [-b blocksize] [-f file] [-s fileno] [file ...]
     restore -x [-chmvy] [-b blocksize] [-f file] [-s fileno] [file ...]

             (The 4.3BSD option syntax is implemented for backward compatibil-
             ity but is not documented here.)

DESCRIPTION

     The restore command performs the inverse function of dump(8). A full
     backup of a file system may be restored and subsequent incremental back-
     ups layered on top of it. Single files and directory subtrees may be re-
     stored from full or partial backups. restore works across a network; to
     do this see the -f flag described below. Other arguments to the command
     are file or directory names specifying the files that are to be restored.
     Unless the -h flag is specified (see below), the appearance of a directo-
     ry name refers to the files and (recursively) subdirectories of that
     directory.

     Exactly one of the following flags is required:

     -i      This mode allows interactive restoration of files from a dump.
             After reading in the directory information from the dump, restore
             provides a shell like interface that allows the user to move
             around the directory tree selecting files to be extracted. The
             available commands are given below; for those commands that re-
             quire an argument, the default is the current directory.

             add [arg]   The current directory or specified argument is added
                         to the list of files to be extracted. If a directory
                         is specified, then it and all its descendents are ad-
                         ded to the extraction list (unless the -h flag is
                         specified on the command line). Files that are on the
                         extraction list are prepended with a "*" when they
                         are listed by ls.

             cd arg      Change the current working directory to the specified
                         argument.

             delete [arg]
                         The current directory or specified argument is delet-
                         ed from the list of files to be extracted. If a
                         directory is specified, then it and all its descen-
                         dents are deleted from the extraction list (unless
                         the -h flag is specified on the command line). The
                         most expedient way to extract most of the files from
                         a directory is to add the directory to the extraction
                         list and then delete those files that are not needed.

             extract     All files on the extraction list are extracted from
                         the dump. restore will ask which volume the user
                         wishes to mount. The fastest way to extract a few
                         files is to start with the last volume and work to-
                         wards the first volume.

             help        List a summary of the available commands.

             ls [arg]    List the current or specified directory. Entries that
                         are directories are appended with a "/". Entries that
                         have been marked for extraction are prepended with a
                         "*". If the verbose flag is set, the inode number of
                         each entry is also listed.

             pwd         Print the full pathname of the current working direc-
                         tory.

             quit        Restore immediately exits, even if the extraction
                         list is not empty.

             setmodes    All directories that have been added to the extrac-
                         tion list have their owner, modes, and times set;
                         nothing is extracted from the dump. This is useful
                         for cleaning up after a restore has been prematurely
                         aborted.

             verbose     The sense of the -v flag is toggled. When set, the
                         verbose flag causes the ls command to list the inode
                         numbers of all entries. It also causes restore to
                         print out information about each file as it is ex-
                         tracted.

     -R      restore requests a particular tape of a multi-volume set on which
             to restart a full restore (see the -r flag below). This is useful
             if the restore has been interrupted.

     -r      Restore (rebuild) a file system. The target file system should be
             made pristine with newfs(8), mounted, and the user cd'd into the
             pristine file system before starting the restoration of the ini-
             tial level 0 backup. If the level 0 restores successfully, the -r
             flag may be used to restore any necessary incremental backups on
             top of the level 0. The -r flag precludes an interactive file ex-
             traction and can be detrimental to one's health (not to mention
             the disk) if not used carefully. An example:

                   # newfs /dev/rrp0g eagle
                   # mount /dev/rp0g /mnt
                   # cd /mnt
                   # restore rf /dev/rst8

             Note that restore leaves a file restoresymtable in the root
             directory to pass information between incremental restore passes.
             This file should be removed when the last incremental has been
             restored.

             restore, in conjunction with newfs(8) and dump(8), may be used to
             modify file system parameters such as size or block size.

     -t      The names of the specified files are listed if they occur on the
             backup. If no file argument is given, the root directory is list-
             ed, which results in the entire content of the backup being list-
             ed, unless the -h flag has been specified. Note that the -t flag
             replaces the function of the old dumpdir program.

     -x      The named files are read from the given media. If a named file
             matches a directory whose contents are on the backup and the -h
             flag is not specified, the directory is recursively extracted.
             The owner, modification time, and mode are restored (if possi-
             ble). If no file argument is given, the root directory is ex-
             tracted, which results in the entire content of the backup being
             extracted, unless the -h flag has been specified.

     The following additional options may be specified:

     -b blocksize
             The number of kilobytes per dump record. If the -b option is not
             specified, restore tries to determine the block size dynamically.

     -c      Normally, restore will try to determine dynamically whether the
             dump was made from an old (pre-4.4) or new format file system.
             The -c flag disables this check, and only allows reading a dump
             in the old format.

     -f file
             Read the backup from file; file may be a special device file like
             /dev/rst0 (a tape drive), /dev/rsd1c (a disk drive), an ordinary
             file, or "-" (the standard input). If the name of the file is of
             the form "host:file" or "user@host:file", restore reads from the
             named file on the remote host using rmt(8).

     -h      Extract the actual directory, rather than the files that it
             references. This prevents hierarchical restoration of complete
             subtrees from the dump.

     -m      Extract by inode numbers rather than by file name. This is useful
             if only a few files are being extracted, and one wants to avoid
             regenerating the complete pathname to the file.

     -s fileno
             Read from the specified fileno on a multi-file tape. File number-
             ing starts at 1.

     -v      Normally restore does its work silently. The -v (verbose) flag
             causes it to type the name of each file it treats preceded by its
             file type.

     -y      Do not ask the user whether to abort the restore in the event of
             an error. Always try to skip over the bad block(s) and continue.

ENVIRONMENT

     If the following environment variable exists it will be utilized by
     restore:

     TMPDIR  The directory given in TMPDIR will be used instead of /tmp to
             store temporary files. Refer to environ(7) for more information.

     TAPE    Default tape device to use instead of /dev/rst0.

FILES

     /dev/rst0          the default tape drive
     /dev/rst*          raw SCSI tape interface
     /tmp/rstdir*       file containing directories on the tape
     /tmp/rstmode*      owner, mode, and time stamps for directories
     ./restoresymtable  information passed between incremental restores

DIAGNOSTICS

     Complains if it gets a read error. If -y has been specified, or the user
     responds "y", restore will attempt to continue the restore.

     If a backup was made using more than one tape volume, restore will notify
     the user when it is time to mount the next volume. If the -x or -i flag
     has been specified, restore will also ask which volume the user wishes to
     mount. The fastest way to extract a few files is to start with the last
     volume, and work towards the first volume.

     There are numerous consistency checks that can be listed by restore. Most
     checks are self-explanatory or can "never happen". Common errors are
     given below.

     Converting to new file system format
             A dump tape created from the old file system has been loaded. It
             is automatically converted to the new file system format.

     <filename>: not found on tape
             The specified file name was listed in the tape directory, but was
             not found on the tape. This is caused by tape read errors while
             looking for the file, and from using a dump tape created on an
             active file system.

     expected next file <inumber>, got <inumber>
             A file that was not listed in the directory showed up. This can
             occur when using a dump created on an active file system.

     Incremental dump too low
             When doing an incremental restore, a dump that was written before
             the previous incremental dump, or that has too low an incremental
             level has been loaded.

     Incremental dump too high
             When doing an incremental restore, a dump that does not begin its
             coverage where the previous incremental dump left off, or that
             has too high an incremental level has been loaded.

     Tape read error while restoring <filename>
     Tape read error while skipping over inode <inumber>
     Tape read error while trying to resynchronize
             A tape (or other media) read error has occurred. If a file name
             is specified, its contents are probably partially wrong. If an
             inode is being skipped or the tape is trying to resynchronize, no
             extracted files have been corrupted, though files may not be
             found on the tape.

     resync restore, skipped <num> blocks
             After a dump read error, restore may have to resynchronize it-
             self. This message lists the number of blocks that were skipped
             over.

SEE ALSO

     environ(7), dump(8), mount(8), newfs(8), rmt(8)

HISTORY

     The restore command appeared in 4.2BSD.

BUGS

     restore can get confused when doing incremental restores from dumps that
     were made on active file systems.

     A level 0 dump must be done after a full restore. Because restore runs in
     user code, it has no control over inode allocation; thus a full dump must
     be done to get a new set of directories reflecting the new inode number-
     ing, even though the content of the files is unchanged.

     The temporary files /tmp/rstdir* and /tmp/rstmode* are generated with a
     unique name based on the date of the dump and the process ID (see
     mktemp(3)), except when -r or -R is used. Because -R allows you to res-
     tart a -r operation that may have been interrupted, the temporary files
     should be the same across different processes. In all other cases, the
     files are unique because it is possible to have two different dumps
     started at the same time, and separate operations shouldn't conflict with
     each other.

MirOS BSD #10-current            July 1, 1997                                3

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