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=head1 NAME
aptitude-robot-session - call aptitude-robot non-interactively
=head1 SYNOPSIS
aptitude-robot-session
=head1 DESCRIPTION
aptitude-robot-session is a helper script meant to be run from cron or init scripts. It will call aptitude-robot with some options suitable for non-interactive use. It will also redirect all output (STDERR and STDOUT) to LOGFILE defined in C</etc/default/aptitude-robot>.
=head1 CONFIGURATION
There are a few configuration options that can be defined in C</etc/default/aptitude-robot>.
=over
=item LOGFILE
the name of the file where all the output of aptitude-robot is collected.
Defaults to C</var/log/aptitude-robot.log>
=item LOG_SESSION
the name of the file where the session log is accumulated.
aptitude-robot-session will append its PID to this file in order not to
overwrite a log file left over from a crashed earlier invocation. If
aptitude-robot-session finishes properly it will append the session log to
LOGFILE and delete the session log.
=item SESSION_REPORT_COMMAND
optional command invoked with the session log as the only argument at the end
of an aptitude-robot-session run. This can be used to file reports to
monitoring systems or support mail addresses.
=item MAX_LOGFILES_SIZE_BLOCKS
file size limit in blocks for the session log. This prevents endless loops if
a package installation continues to ask the same question for which no terminal
is available to provide an answer.
But be aware that this limit also affects _all_ daemons started or
restarted during the aptitude-robot-session run, including e.g. the
OpenSSH daemon which again will propagate the limit to its remote
login sessions. Use with care.
=item POST_SESSION_HOOK
a command that is run at the end of a successful aptitude-robot-session. E.g.,
use it for apt-get clean.
=back
=head1 EXIT STATUS
aptitude-robot-session exits with 0 on success, 1 if dpkg is locked, 2 if apt
failed to fetch some APT repositories.
=head1 BUGS
The non-interactive nature of aptitude-robot-session may trigger the condition
reported in https://bugs.launchpad.net/ubuntu/+source/aptitude/+bug/257279
=head1 SEE ALSO
L<aptitude-robot(8)>, L<aptitude(8)>
=head1 AUTHORS
Elmar S. Heeb <elmar@heebs.ch> and Axel Beckert <abe@debian.org>
=cut
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