[Bug 1612600] Re: backuppc 3.3.1-2ubuntu3 breaks pool graphs on the Status page

[Johan Ehnberg]

Can a maintainer please nominate this for xenial separately. The status
is misleading since the fix is not in released in xenial, which is what
this bug was filed against. The janitor does not act on tags.

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Title:
  backuppc 3.3.1-2ubuntu3 breaks pool graphs on the Status page

Status in backuppc package in Ubuntu:
  Fix Released

Bug description:
  Upgraded system from 14.04 LTS to 16.04.1 LTS.

  As a result, the rrd pool size graphs stopped displaying, instead
  showing "default image" icons.

  Investigation has shown that this is due to the permissions conflict.
  Whatever user executes backuppc/index.cgi cannot run /usr/bin/rrdtool.

  The fix is as per
  https://sourceforge.net/p/backuppc/mailman/message/18724263/.

  Namely, here's a relevant code snapshot in
  /usr/share/backuppc/lib/BackupPC/CGI/GeneralInfo.pm:

    $In{image} =~ /([0-9]+)/;
    my $weeks = $1;
    my $real = $<;# NEW
    $< = $>; # NEW
    print "Content-type: image/png\n\n";
    print `/usr/bin/rrdtool graph - --imgformat=PNG --start=end-${weeks}w --end=-300 --title="BackupPC Pool Size (${weeks} weeks)" --base=1000 --height=100 --width=600 --alt-autoscale-max --lower-limit=0 --vertical-label="" --slope-mode --font TITLE:10:Times --font AXIS:8:Times --font LEGEND:8:Times --font UNIT:8:Times -c BACK#FFFFFF DEF:ao="$LogDir/pool.rrd":ckb:AVERAGE CDEF:a=ao,1024,* AREA:a#95B8DB:"CPool in bytes"  GPRINT:a:LAST:"Current\\:%8.2lf %s" GPRINT:a:AVERAGE:"Average\\:%8.2lf %s" GPRINT:a:MAX:"Maximum\\:%8.2lf %s\\n"`;
    $< = $real; # NEW
    return;

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