Laur IVAN

Run a Rundeck Command as a Different User

Posted by in Software, Tutorial

TL;DR: Add the rundeck user to the sudoers and then use sudo Installing rundeck on Ubuntu usually results in creating a rundeck user. We had a bunch of issues creating a rundeck job because we needed to execute a command as a specific user (only that user had access to some resources). Unfortunately, rundeck is not as versatile as Jenkins (plugins and such) — or I couldn’t find anything relevant at the time. Initially, I’ve tried adding the rundeck user to the same group as the other user, but only…read more

Build a Django Docker Image with Cx-Oracle

Posted by in Software, Tutorial

TL;DR: Don’t use alpine images. There’s a glibc issue. We added a cx-oracle dependency to one of our django apps. As the previous image was just an alpine basic (python) image we needed to put in place a process to build the new image. Initially, I’ve tried to use the same alpine image (oh, the slimmed down size is sooo tempting), but then I’ve hit a bunch of “Unknown symbol” messages when I’ve ran the install of cx-oracle in the docker build process. Subsequently, I’ve had to switch to python:3.6-slim-jessie….read more

Execute a Command in Every Directory with Bash

Posted by in Software, Tutorial

TL;DR: Use a find-based loop The other day I was wondering how to execute a command in each sub-directory of a project. In python, you have os.walk. In C, I would’ve probably written myself something just for fun etc. In shell, I know you have find which is capable of finding all directories (find (dir) -type d). All I need to do is to wrap this in a loop and for this one has two options: Commmand line style

or

Script style with a loop

The choice…read more

Build Update Statements with Oracle SQL Developer and Python

Posted by in Software, Tutorial

By default, SQL Developer can only export INSERT statements. This is quite unfortunate when one needs to build UPDATE statements because their syntax is different. I’ve tried to use regexp to convert the statements but I didn’t find it not straight forward at all. So, I cam up with the following strategy: Export the data as JSON Use a python script (below) to write the statements The python script We first need to specify things like the DB Schema, table and the primary key:

Subsequently, I’ve defined a wrapper…read more

Run Restricted Groovy API in Jenkins

Posted by in IT, Tutorial

The more recent versions of Jenkins have improved on security. Unfortunately, a side-effect is that scripts which were running before would fail now. An example is:

… which would list the projects defined in Jenkins. Fortunately, you can have access to theis API via the In-process Script Approval plugin (which is installed by default). If the script (pipeline) is versioned or executed in the sandbox, then you’ll need to approve method by method. If the script is not versioned, then you have the option to execute it outside the…read more

Fix Missing In-process Script Approval in Jenkins

Posted by in IT, Tutorial

Normally, when you have a script or a method to be approved, you should see the In-process Script Approval entry in your Jenkins’ configuration: Unfortunately, the In-process Script Approval entry in Jenkins’ configuration is not always shown, even though we have items to be approved. I found that installing the Permissive Script Security and briefly enabling it would solve the problem. On linux (Ubuntu), you need to edit /etc/default/jenkins and add

Then, you need to restart Jenkins for the security plugin to be disabled. I executed one of the…read more

Bulk Change the Date on Photos

Posted by in Random, Tutorial

I’ve got a new camera and I forgot to update the date. Consequently, the first photos are taken on 01/01/2017 instead of 04/03/2018. Given that more than 100 photos were taken, it would be a pain to change them one by one. So, here are the steps I did update the date: Download exiv2. Just search for exiv2-0.26-msvc.tar.gz (0.26 was the most recent at the moment of writing). Open it and extract the relevant folder (\dist\2015\x64\dll\Release in my case) in a convenient place (e.g. C:\EXIV\) Open a command prompt to…read more

Fix Jenkins Ignored Plugin “Check Now”

Posted by in IT, Tutorial

TL;DR: Check if a browser extension is blocking your request when you click Check Now While playing more with jenkins, I’ve encountered an error while requesting Check Now for plugin updates: it seemed that my request got ignored. I’ve tried different URLs (with and without HTTPS, stable or not) with the same result: my request seemed to be ignored. I’ve assumed first there’s a proxy error or some limitation on the server side. The logs however didn’t reveal anything. Then, I’ve checked the browser side and I’ve found that my…read more

Fade colors in Corona using Transitions

Posted by in Software, Tutorial

Corona provides transitions. According to this post, a transitionTo(…) would suffice:

The user can also cancel the transition if needed (which is waht I would need to do later in the code). In case you’re into custom stuff and the easing functions are not enough, you can create your own. A sample can be found here. The signature of the easing function is (at the moment of writing) function customEasing(t, tMax, start, delta) where: t is the time elapsed since the start tMax is the duration of the transition…read more

Fade Colors on a Polygon using the Game Loop

Posted by in Software, Tutorial

One of the features I need to implement is to smoothly change the fill/stroke color of a polygon, like this: A manual approach In order to better understand the mechanics, I built my own fading PoC. First, one would need to build the polygon:

In this particular case, I have a text field and a rounded rectangle beneath it. the hud group contains both in the right order. Once the components have been created, we build the function to be called each frame:

The idea is to only…read more