=head1 NAME

restorevol - Restore a volume from vos dump to the local file system

=head1 SYNOPSIS

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B<restorevol> S<<< [B<-file> <I<dump file>>] >>> S<<< [B<-dir> <I<restore dir>> ] >>>
    S<<< [B<-extension> <I<name extension>>] >>>
    S<<< [B<-mountpoint> <I<mount point root>>] >>>
    S<<< [B<-umask> <I<mode mask>>] >>> [B<-verbose>] [B<-help>]

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=head1 DESCRIPTION

B<restorevol> takes an AFS volume in the format produced by B<vos dump>
and restores it to the local file system.  Normally, the contents of a
volume are maintained by the AFS File Server in an opaque format and
copying a volume's raw data does not make it easily accessible.  This
utility will produce a directory tree that is equivalent to that seen via
an AFS client, but without preserving the AFS-specific Access Control
Lists (ACLs).  It's primary use is to recover data from a volume dump or
backup and make it available via a filesystem other than AFS.

The dump output will read from standard input, or from a file if B<-file>
is specified.

The restore process is as follows:

=over 4

=item 1. 

The dump file will be restored within the current directory or that
specified with B<-dir>.

=item 2. 

Within this directory, a subdir is created.  It's name is the RW volume
name that was dumped.  An extension can be appended to this directory name
with B<-extension>.

=item 3. 

All mountpoints will appear as symbolic links to the volume name.  The
path name to the volume will be either that in B<-mountpoint>, or B<-dir>.
Symbolic links remain untouched.

=item 4. 

You can change your umask during the restore with B<-umask>.  Otherwise,
B<restorevol> uses your current umask.  Mode bits for directories are 0777
(then AND'ed with the umask).  Mode bits for files are the owner mode bits
duplicated accross group and user (then AND'ed with the umask).

=item 5. 

For restores of full dumps, if a directory says it has a file and the file
is not found, then a symbolic link F<< AFSFile-<#> >> will appear in that
restored tree.  Restores of incremental dumps remove all these files at
the end (expensive because it is a tree search).

=item 6. 

If a file or directory was found in the dump but found not to be connected
to the hierarchical tree, then the file or directory will be connected at
the root of the tree as F<< __ORPHANEDIR__.<#> >> or F<<
__ORPHANFILE__.<#> >>.

=item 7. 

ACLs are not restored.

=back

=head1 CAUTIONS

Normally, use L<vos_restore(1)> instead of this command.  B<restorevol> is
a tool of last resort to try to extract data from the data structures
stored in a volume dumpfile and is not as regularly tested or used as the
normal L<vos_restore(1)> implementation.  Using B<restorevol> bypasses
checks done by the L<fileserver(8)> and L<salvager(8)>.

=head1 OPTIONS

=over 4

=item B<-file> <I<dump file>>

Specifies the output file for the dump.  If this option is not given, the
volume will be dumped to standard output.

=item B<-dir> <I<restore dir>>

Names the directory in which to create the restored filesystem.  The
current directory is used by default.  Note that any mountpoints inside
the volume will point to the same directory unless the B<-mountpoint>
option is also specified.

=item B<-extension> <I<name extension>>

By default, the name of the directory created matches the RW volume name
of the volume in the dump file.  If this option is used, the directory
name will be the RW volume name I<name extension> as the suffix.

=item B<-mountpoint> <I<mount point root>>

By default, mountpoints inside the volume being restored point to the
value given by I<-dir>.  This option allows mountpoints to be resolved
relative to another path.  A common use for this would be to specify a
path under F</afs> as the mount point root so that mountpoints inside the
restored volume would be resolved via AFS.

The I<mount point root> must exist, and the process running the command
have read access to that directory, or the command will fail.

=back

=head1 EXAMPLES

The following command restores the contents of the dumpfile in
F<sample.dump> to the directory F</tmp/sample.2009-05-17>, but having all
mountpoints inside the volume point to AFS (note that this requires
knowledge of where F<sample> is mounted in AFS):

   % restorevol -file sample.dump -dir /tmp -extension .2009-05-17 \
       -mountpoint /afs/example.org/sample
   Restoring volume dump of 'sample' to directory '/tmp/sample.2009-05-17'

=head1 PRIVILEGE REQUIRED

The issuer must have read access to the dump file and write access to the
directory into which the dump is restored.  If the B<-mountpoint> flag is
given, the issuer must also have read access to that directory.

=head1 SEE ALSO

L<salvager(8)>,
L<voldump(8)>,
L<vos_dump(1)>,
L<vos_restore(1)>

=head1 COPYRIGHT

Copyright 2009 Steven Jenkins <steven@endpoint.com>

This documentation is covered by the BSD License as written in the
doc/LICENSE file. This man page was written by Steven Jenkins for
OpenAFS.
