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Does an openHAB Item exist?

In a more complex openHAB2 Rule I'm writing, I need to find out if a certain Item exist. If I try to access it when it does not exist, the Rule will fail. Not good.

I could pass in a parameter to the framework which builds the Rule, but that is cumbersome and requires changes on several places.

Let's see if I can have the Rule figure this out.

 

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Icinga Director and disk checks for fuse mountpoints

When I rolled out my new Icinga2 installation, and added disk checks for all laptops, I ran into a small problem: there is a fuse mountpoint for logged in users which only the user can read. Apparently it has something to do with Flatpack.

cat /proc/mounts | grep doc
/dev/fuse /run/user/1000/doc fuse rw,nosuid,nodev,relatime,user_id=1000,group_id=1000 0 0

By default, the Icinga2 ITL has a number of file system types excluded for the "check_disk" check, even some special fuse types, but plain "fuse" is not among them. Kind of makes sense, a fuse mountpoint can be anything, and you don't want to exclude all of them by default.

This results in the following error message when the check is rolled out on our laptops:

Plugin Output
DISK CRITICAL - /run/user/1000/doc is not accessible: Permission denied

Fortunately the fix is rather easy:

 

 

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Enable and disable window dimming in KDE

When I make changes in OpenStreetMap, I often need to extract the object colour from a picture or a video, as example for a building, bench or a roof. This collides with a feature in KDE which I really like: Dim Inactive Windows.

The setting is in the KDE settings, under Desktop Effects -> Dim Inactive. As the name implies, it dims (makes them a bit more dark) all non-active windows - which makes it visually clear which window is currently active. Quite useful.

For picking a colour from a picture/video I'm using KColorChooser, which provides the colour in Hex code - exactly what I need in OSM.

However when KColorChooser is the active window, and all other windows are dimmed, it extracts the wrong colour from the picture/video - the colour which is already dimmed. Not what I need. Therefore when I do OSM edits, I temporarily disable this feature.

At first I went into the KDE settings, twice, but this is too many clicks. Then I figured out the commandline arguments to disable and enable this feature.

Disable "Dim Inactive":

kwriteconfig5 --file kwinrc --group Plugins --key diminactiveEnabled false
qdbus org.kde.KWin /KWin reconfigure

Enable "Dim Inactive":

kwriteconfig5 --file kwinrc --group Plugins --key diminactiveEnabled false
qdbus org.kde.KWin /KWin reconfigure

Now all I need to do is execute a small script which is in my personal ~/bin directory. Let the edits continue.

Note: I wish JOSM would have an integrated video player which also allows to pick colours. But so far I haven't found any such plugin.

How to configure notifications in Icinga2 Director

I'm using Icinga2 for a long time, but recently installed a new system and using Director for the first time. I know how to configure notifications in Icinga2 config files, but getting them working in Director (with Director options only) is a bit of a challenge.

Here is a step-by-step to get simple mail notifications working. From there it should be easier to configure more advanced notifications.

 

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Find fire stations in OpenStreetMap using Overpass Turbo

My kid got a new project: find fire stations. Google Maps is not really helpful here, obviously. And searching in the OpenStreetMap web interface is also a lot of work. But Overpass Turbo is able to find all the places.

 

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Avoid linebreaks in Hugo shortcodes

Shortcodes in Hugo are a neat and poweful system to avoid repating the same piece of text over and over again. Let's say I have the following text:

Nunc in odio id magna molestie congue. Donec erat nulla, pulvinar eget volutpat non, molestie at nisi. Curabitur nec tristique felis. Cras imperdiet, ante et vestibulum iaculis, tellus ipsum pulvinar felis, at viverra est tellus et eros. In nec dignissim lectus, bibendum hendrerit ex. Praesent lobortis eget justo non vehicula.

Nulla et neque cursus libero tristique laoreet nec a ligula. Fusce sit “amet” scelerisque erat. Quisque lorem lectus, lobortis vitae mattis non, tincidunt sed felis. Donec sit “amet” erat nibh.

Orci varius natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. In et imperdiet dui. In ut enim pharetra, blandit purus vel, malesuada est. Morbi sollicitudin eget leo nec dignissim. Praesent sed leo quis purus pretium aliquet sed quis arcu. Pellentesque facilisis tellus nulla, dignissim laoreet quam maximus et.

And I want to link the "amet" word, then I can create a shortcode:

layouts/shortcodes/amet.html

And in this shortcode I place the text:

<a href="https://www.lipsum.com/feed/html">amet</a>

In the Markdown source this is:

Nulla et neque cursus libero tristique laoreet nec a ligula. Fusce sit "{{< amet >}}" scelerisque erat. Quisque lorem lectus, lobortis vitae mattis non, tincidunt sed felis. Donec sit "{{< amet >}}" erat nibh.

Pretty easy. However Hugo by default does a little bit too much: while generating the static content, it adds a line break. Which in the browser results in:

Nulla et neque cursus libero tristique laoreet nec a ligula. Fusce sit “amet ” scelerisque erat. Quisque lorem lectus, lobortis vitae mattis non, tincidunt sed felis. Donec sit “amet ” erat nibh.
                                                                            ^                                                                                                         ^

There is a nasty little space between the word and the quotation mark. The generated HTML source shows the problem:

  <p>Nunc in odio id magna molestie congue. Donec erat nulla, pulvinar eget volutpat non, molestie at nisi. Curabitur nec tristique felis. Cras imperdiet, ante et vestibulum iaculis, tellus ipsum pulvinar felis, at viverra est tellus et eros. In nec dignissim lectus, bibendum hendrerit ex. Praesent lobortis eget justo non vehicula.</p>
<p>Nulla et neque cursus libero tristique laoreet nec a ligula. Fusce sit &ldquo;<a href="https://www.lipsum.com/feed/html">amet</a>
&rdquo; scelerisque erat. Quisque lorem lectus, lobortis vitae mattis non, tincidunt sed felis. Donec sit &ldquo;<a href="https://www.lipsum.com/feed/html">amet</a>
&rdquo; erat nibh.</p>

Usually a line break in HTML is not a big deal, the browsers deal with that. But here an unnecessary space is added while rendering the content. Hugo makes it complicated to avoid this problem. There is no default setting to turn this off, however the shortcode can have an extra Hugo tag to avoid the training linebreak:

<a href="https://www.lipsum.com/feed/html">amet</a>{{- / Strip trailing newline. / -}}

By adding the {{- -}}, the training line break is not included in the final HTML output, and the quotation mark comes right after the shortcode content.