#!/usr/bin/env bash
VERSION='1.3.15'

[ -z $NARADA_SKIP_LOCK ] && exec narada-lock-exclusive $0 "$@"


# compatibility with Narada before 0.9
[ -d config/backup ] || mkdir config/backup || exit 1
[ -f config/backup/exclude ] || cat >config/backup/exclude <<'EOF' || exit 1
./var/.lock.new
./tmp/*
./var/backup/*
./var/patch/.prev/*
EOF
# compatibility with Narada before 1.2.0
perl -i -pe 's{var/patch/prev/}{var/patch/.prev/}' config/backup/exclude


snap='var/backup/snap'
full='var/backup/full.tar'
incr='var/backup/incr.tar'
excl=(); while read; do excl+=( --exclude "$REPLY" ); done <config/backup/exclude


_tar(){
    tmp=/tmp/narada-backup.$$
    TAR=`which gtar tar 2>/dev/null | head -n 1`
    LANG= $TAR "$@" &>$tmp
    status=$?
    grep -v 'socket ignored' $tmp
    rm $tmp
    return $status
}

narada-mysqldump                                    &&
if [ -f $snap -a -f $full ]; then
    mv $full $full.tmp                              &&
    _tar -c -g $snap "${excl[@]}" -f $incr.tmp ./   &&
    mv $incr.tmp $incr                              &&
    _tar -g /dev/null -A $incr -f $full.tmp
else
    rm -f $snap $full $full.tmp $incr $incr.tmp     &&
    _tar -c -g $snap "${excl[@]}" -f $full.tmp ./
fi                                                  &&
mv $full.tmp $full


exit $?
: <<'=cut'

=head1 NAME

narada-backup - prepare consistent project backup

=head1 VERSION

This document describes narada-backup version 1.3.15

=head1 USAGE

    narada-backup


=head1 DESCRIPTION

At first run prepare full project backup in 'var/backup/full.tar'.
On next runs prepare incremental backup in 'var/backup/incr.tar' plus
append it to full backup in 'var/backup/full.tar' (using tar -A).

Because of used technique of quick full backup update, full backup will
grow on each run. To keep file with full backup on reasonable size, you
should force full backup from time to time.

To force full backup you should remove 'var/backup/full.tar' before running
narada-backup.

Both full and incremental backups should be unpacked as incremental tar
archives, see http://www.gnu.org/software/automake/manual/tar/Incremental-Dumps.html.

Before preparing backup will run narada-mysqldump.

Files and directories listed in config/backup/exclude (use syntax suitable
for tar's --exclude option) will not be included in backup.

Will exit with non-zero exit status if backup process failed.

Script must be executed only from "project root directory".


=head1 REQUIRED ARGUMENTS

None.

=head1 OPTIONS

See USAGE.

=head1 DIAGNOSTICS

None.

=head1 CONFIGURATION AND ENVIRONMENT

Use files in var/backup/.

=head1 DEPENDENCIES

None.

=head1 INCOMPATIBILITIES

None reported.

=head1 BUGS AND LIMITATIONS

No bugs have been reported.

Please report any bugs or feature requests to
C<bug-narada@rt.cpan.org>, or through the web interface at
L<http://rt.cpan.org>.


=head1 AUTHOR

Alex Efros C<< <powerman@cpan.org> >>


=head1 LICENSE AND COPYRIGHT

Copyright (c) 2008-2015 Alex Efros C<< <powerman@cpan.org> >>. All rights reserved.

This module is free software; you can redistribute it and/or
modify it under the same terms as Perl itself. See L<perlartistic>.


=head1 DISCLAIMER OF WARRANTY

BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
FOR THE SOFTWARE, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
PROVIDE THE SOFTWARE "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE SOFTWARE IS WITH
YOU. SHOULD THE SOFTWARE PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL
NECESSARY SERVICING, REPAIR, OR CORRECTION.

IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
REDISTRIBUTE THE SOFTWARE AS PERMITTED BY THE ABOVE LICENCE, BE
LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL,
OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE
THE SOFTWARE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
FAILURE OF THE SOFTWARE TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.

=cut