luci-app-statistics: Add backup/restore for RRD statistics

Add a backup/restore capability for rrd data storage in
luci_statistics.  The data storage is typically in /tmp and does not
survive reboot or sysupgrade.  This adds an option for the
administrator to configure the RRD plugin, so that the RRD data are
are preserved with a backup copy in the overlay file system.

This works for shutdown/reboot, sysupgrade (backup config files,
restore config files, and true sysupgrade).

Also fix a bug where starting luci_statistics for the first time would
not get a restart a running collectd: during install of the package
when it is not included in the base flashed image, collectd might be
started when it got installed/configured before this package gets
installed/configured.  So we need to check if it's running, and
restart it to use the luci_statistics configuration.

Signed-off-by: John Kohl <jtk.git@bostonpog.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/applications/luci-app-statistics/htdocs/luci-static/resources/view/statistics/plugins/rrdtool.js b/applications/luci-app-statistics/htdocs/luci-static/resources/view/statistics/plugins/rrdtool.js
index e971e2c6c4..7e2704a2c3 100644
--- a/applications/luci-app-statistics/htdocs/luci-static/resources/view/statistics/plugins/rrdtool.js
+++ b/applications/luci-app-statistics/htdocs/luci-static/resources/view/statistics/plugins/rrdtool.js
@@ -16,6 +16,11 @@ return baseclass.extend({
 		o.default = '/tmp/rrd';
 		o.depends('enable', '1');
 
+		o = s.option(form.Flag, 'backup', _('Backup RRD statistics'),
+			     _('Backup and restore RRD statistics to/from non-volatile storage around shutdown, reboot, and/or sysupgrade'));
+		o.default = '0';
+		o.depends('enable', '1');
+
 		o = s.option(form.Value, 'StepSize', _('RRD step interval'), _('Seconds'));
 		o.placeholder = '30';
 		o.datatype = 'uinteger';