cback3-span - Span staged data among multiple discs
This is the Cedar Backup 3 span tool. It is intended for use by people who back
up more data than can fit on a single disc. It allows a user to split (span)
staged data between more than one disc. It can't be a Cedar Backup extension
in the usual sense because it requires user input when switching media.
Generally, one can run the cback3-span command with no arguments. This will
start it using the default configuration file, the default log file, etc. You
only need to use the switches if you need to change the default behavior.
This command takes most of its configuration from the Cedar Backup configuration
file, specifically the store section. Then, more information is gathered from
the user interactively while the command is running.
The main difference between Cedar Backup version 2 and Cedar Backup version 3 is
the targeted Python interpreter. For most users, migration should be
straightforward. See the discussion found at cback3(1) or reference the Cedar
Backup user guide.
- -h, --help
- Display usage/help listing.
- -V, --version
- Display version information.
- -b, --verbose
- Print verbose output to the screen as well writing to the
logfile. When this option is enabled, most information that would normally
be written to the logfile will also be written to the screen.
- -c, --config
- Specify the path to an alternate configuration file. The
default configuration file is /etc/cback3.conf.
- -l, --logfile
- Specify the path to an alternate logfile. The default
logfile file is /var/log/cback3.log.
- -o, --owner
- Specify the ownership of the logfile, in the form
user:group. The default ownership is root:adm, to match the Debian
standard for most logfiles. This value will only be used when creating a
new logfile. If the logfile already exists when the cback3 script is
executed, it will retain its existing ownership and mode. Only user and
group names may be used, not numeric uid and gid values.
- -m, --mode
- Specify the permissions for the logfile, using the numeric
mode as in chmod(1). The default mode is 640 (-rw-r-----). This
value will only be used when creating a new logfile. If the logfile
already exists when the cback3 script is executed, it will retain its
existing ownership and mode.
- -O, --output
- Record some sub-command output to the logfile. When this
option is enabled, all output from system commands will be logged. This
might be useful for debugging or just for reference.
- -d, --debug
- Write debugging information to the logfile. This option
produces a high volume of output, and would generally only be needed when
debugging a problem. This option implies the --output option, as
- -s, --stack
- Dump a Python stack trace instead of swallowing exceptions.
This forces Cedar Backup to dump the entire Python stack trace associated
with an error, rather than just progating last message it received back up
to the user interface. Under some circumstances, this is useful
information to include along with a bug report.
- -D, --diagnostics
- Display runtime diagnostic information and then exit. This
diagnostic information is often useful when filing a bug report.
This command returns 0 (zero) upon normal completion, and six other error codes
related to particular errors.
- The Python interpreter version is < 3.4.
- Error processing command-line arguments.
- Error configuring logging.
- Error parsing indicated configuration file.
- Backup was interrupted with a CTRL-C or similar.
- Other error during processing.
Cedar Backup itself is designed to run as root, since otherwise it's difficult
to back up system directories or write the CD or DVD device. However,
cback3-span can be run safely as any user that has read access to the Cedar
Backup staging directories and write access to the CD or DVD device.
- /etc/cback3.conf - Default configuration file
- /var/log/cback3.log - Default log file
- The project homepage is:
If you find a bug, please report it.
If possible, give me the output from --diagnostics, all of the error messages
that the script printed into its log, and also any stack-traces (exceptions)
that Python printed. It would be even better if you could tell me how to
reproduce the problem, for instance by sending me your configuration file.
Report bugs to <firstname.lastname@example.org> or by using the BitBucket
Written and maintained by Kenneth J. Pronovici <email@example.com> with
contributions from others.
Copyright (c) 2004-2011,2013-2015 Kenneth J. Pronovici.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR