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https://launchpad.net/bugs/1329816
[stub] Initialize backup log file on install to silence spurious nagios alert, per https://code.launchpad.net/~stub/charms/precise/postgresql/bug-1329816-backup-log-spurious-alert/+merge/223210

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hooks/hooks.py
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        os.path.join(postgresql_scripts_dir, 'pg_backup_job'),
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        backup_job, perms=0755)
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    install_postgresql_crontab(postgresql_crontab)
 
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    # Create this empty log file on installation to avoid triggering
 
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    # spurious monitoring system alerts, per Bug #1329816.
 
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    if not os.path.exists(backup_log):
 
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        host.write_file(backup_log, '', 'postgres', 'postgres', 0664)
 
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    hookenv.open_port(get_service_port())
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    # Ensure at least minimal access granted for hooks to run.
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            .format(get_service_port()))
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    # pgsql backups
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    nrpe_check_file = '/etc/nagios/nrpe.d/check_pgsql_backups.cfg'
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    backup_log = "{}/backups.log".format(postgresql_logs_dir)
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    # XXX: these values _should_ be calculated from the backup schedule
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    #      perhaps warn = backup_frequency * 1.5, crit = backup_frequency * 2
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    warn_age = 172800
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juju_log_dir = "/var/log/juju"
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external_volume_mount = "/srv/data"
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backup_log = os.path.join(postgresql_logs_dir, "backups.log")
 
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if __name__ == '__main__':
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    # Hook and context overview. The various replication and client